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Telephone Line Interface and Speakerphone Circuit
AS2523, AS2524, AS2524B
Key Features
-
PRELIMINARY DATA SHEET
General Description
AS2523/24 is a CMOS integrated circuit that incorporates DC and AC line adaptation (DC-mask and synthesized ACimpedance of 1000) as well as a speech circuit with softclipping, line loss compensation and Rx-volume control for handset and handsfree operation. It shall act as an a/bline powered device, which is controlled by a CPU via a serial interface on AS2523 or a standard dialler via a parallel interface on AS2524 and AS2524B.
Line/Speakerphone circuit on a 28-pin CMOS-IC, simple inventory: same die for AS2523/24 and AS2523/24B Serial I/F on AS2523, parallel I/F on AS2524 Enhanced voice switching Background noise monitoring Tx- and Rx-gain programmable on AS2523 only Digital volume control of Rx signals on AS2523 only DC characteristic programmable on AS2523 only Dual softclipping in handset mode on AS2523 only Dual softclipping in handsfree mode on AS2523 only Loudspeaker amplifier for loudhearing and handsfree Supply voltage generation for external circuitry Automatic line loss compensation on AS2523 / 24B only Real and complex impedance selectable by external components Side tone adaptation selectable by external components Unique EMC performance Operating range from 15mA to 100mA (down to 5mA with reduced performance) Few external components
Applications
Enhanced handsfree feature phones with CallerID and extended displays. The AS2524 and AS2524B are developed to interface with common Taiwanese dialers.
Package
Available in 28-pin SOIC or die
Block Diagram
Revision 1.12, Preliminary
Page 1 of 19
Data Sheet AS2523, AS2524, AS2524B
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Pin description
Pin # 15 Symbol LS Function
Line Current Sense Input
Analog input for sensing the line current
12
LI
Line Input
Analog input used for power extraction and line current sensing
13
RI
Receive Input
Analog input for ac-separated receive signal
9
STB
Side Tone Balance Input
Analog input for side tone cancellation network
10
CS
Current Shunt Control Output
N-channel open drain output to control the external high power shunt transistor for synthesizing AC- and DC-impedance, modulation of line voltage and shorting the line during make periods of pulse dialing
16
CI
Complex Impedance Input
Analog input pin for the capacitor to program a complex impedance
14
SS
Supply Source Control Output
N-channel open drain output to control the external high power source transistor for supplying (Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode
11
VSS
Voltage Source Source
Negative Analog Power Supply
18
VDD
Voltage Drain Drain
Positive Analog Power Supply
19
AGND
Analog Ground
Special ground for the internal amplifiers
8
M1
Microphone Input 1
Differential input for the handset microphone (electret)
6
M2
Microphone Input 2
Differential input for the handset microphone (electret)
7
M3
Microphone Input 3
Differential input for the handsfree microphone (electret)
5
M4
Microphone Input 4
Differential input for the handsfree microphone (electret)
17
RO
Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150 to 300
Revision 1.12, Preliminary
Page 2 of 19
Data Sheet AS2523, AS2524, AS2524B
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Pin # 25
Symbol xCS
Function
Chip Select on AS2523
Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm ) Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B
/xMUTE 26 DI
Data Input
on AS2523
Data input of the serial interface. Internal pull-up resistor ( 100kOhm ) /xPD 27 CLK Power down mode for AS2524 and AS2524B (On-hook)
Clock on AS2523
Clock input of the serial interface. Internal pull-up resistor ( 100kOhm ) Handsfree mode operation on AS2524 and AS2524B
/HFE 23 2 3 4 1 20 21 24 22 28 LO FT1 TXO TXV CBN RECI RECV VSSA VPP TONEIN
Loudspeaker Output. Output pin is for a 25
Analog output of the transmit signal
loudspeaker
Analog input pin for connecting a capacitor for offset cancellation.
Analog input for the transmit signal in the voice switching path Analog input pin for connecting a capacitor for background noise monitoring. Analog input for the handsfree receive path. Should be connected to RO via coupling capacitor. Analog input for receive voice switching path. Power supply pin for LO output amplifier. Power supply pin for LO output amplifier. Analog input for DTMF-signals.
Revision 1.12, Preliminary
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Data Sheet AS2523, AS2524, AS2524B
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Detailed Block Diagram
Revision 1.12, Preliminary
Page 4 of 19
Data Sheet AS2523, AS2524, AS2524B
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The gain of the M3/M4 LS is set to +46dB. This gain can be changed by programming from +39dB to +54dB in 1dB steps on AS2523. The input is differential with an impedance of 10k. The soft clip circuit limits the output voltage at LS to 2Vp. There is no LLC for this path.
Functional Description
DC conditions
The normal operating mode is from 15mA to 100mA. An operating mode with reduced performance is from 5mA to 15mA. In the line hold range from 0mA to 5mA the device is in a power down mode. The DC characteristic is determined by the voltage at LIpin and a 30 resistor between LI- and LS-pin. It can be calculated by the following equation: VLS = VLI + ILine * 30. VLI can be programmed to be 3.5V or 4.5V.
Receive path
The gain of the LS RO receive path is set to +7.5dB. This gain can be changed by programming from -7.5dB to +7.5dB in 1dB steps (Register Rxgain). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at RO to 1Vp. It prevents harsh distortion and acoustic shock. There is LLC for this path. The gain of the LS LO receive path is set to +32dB. This gain can be changed by programming from +19dB to 34dB in 1dB steps. The user can also change the gain via Register Handsfree receive end gain (See section "Handsfree"). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at LO to 1.1Vp. It prevents harsh distortion and acoustic shock. There is optional LLC for this path.
2/4 wire conversion
AS2523/24 has built in two Wheatstone bridges with one common ground. This provides a maximum of independence of AC-impedance and side tone from each other. One can adapt side tone without changing the ACimpedance.
AC-impedance
The AC-impedance of AS2523/24 is set to t.m. 1000. With the external capacitor at CI-pin it can be programmed complex. With an external resistor of approx. 1.5k connected to the LS-pin it can be programmed to 600.
Line Loss Compensation (AS2523, AS2524B)
programmable on AS2523 not activated at AS2524 - permanently activated at AS2524B When it is activated, the transmit and receive gains for both I/O's are decreased by 6dB at line currents from 20mA to 50mA or from 45mA to 75mA.
-
Side Tone
A good side tone cancellation can be achieved by using the following equation: ZBAL/ZLINE = 10
Handsfree
The handsfree function allows voice communication without using the handset (full 2-way speaker phone). Two voice controlled attenuators prevent acoustic coupling between the loudspeaker and the microphone. The voice switching circuit has three states, namely idle, transmit or receive. In receive mode the attenuation of the receive path and the transmit path can be controlled by Register Handsfree receive end gain between 0dB and -20dB. The following table shows how voice switching is controlled
Transmit path
The gain of the M1/M2 LS is set to +37dB. This gain can be changed by programming on AS2523 from +30dB to +45dB in 1dB steps (Register Txgain), on AS2524 / 24B it is set to +37dB per default. The input is differential with an impedance of 10k. The soft clip circuit limits the output voltage at LS to 2Vp. There is LLC for this path.
voice switching circuit
TX_atten RX Voice switching speech Backgnd noise monitor
Revision 1.12, Preliminary
Page 5 of 19
Data Sheet AS2523, AS2524, AS2524B
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LINE +14dB
+8dB ~ +17dB
Gmax = +9dB Gmin = -21dB ... -40dB (Vol)
+23dB
+3dB
TXO RO TXV
Compress
Peak detector
0mV ~ 100mV
speech Voice switching Peak detector Compress Offset comp
FT1 CBN
Compress
RECV
Peak detector
Cmicoffset CBckgnd
RECI
Gmax = -4dB ... +16dB (Vol) Gmin = -33dB
+9dB
Speech Rx > Tx_atten Tx_atten > Rx Tx_atten > Rx X NO YES
Mode Receive Idle Transmit
Rx-gain 0db to -20dB -25 -50dB
Tx-gain -50dB to -30dB -25 0dB
Remark adjustable with VOL-setting middle position independent of VOL-setting
IDLE-mode RX-mode
0dB
TX-mode
-10dB TX-gain
-20dB Vol max Vol default Vol min -25dB -30dB
-40dB
RX-gain
-50dB
Revision 1.12, Preliminary
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Data Sheet AS2523, AS2524, AS2524B
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Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only)
The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated at the AS2524B.
(dB) 35 34 33 32 31 30 29
Tx Gain
No LLC (AS2523, AS2524) LLC low (AS2523) LLC high (AS2523,AS2524B)
f = 800 Hz ZLINE = 600 VLS = -10 dBm 20 30 40 50 60 70 80
DC Line Current (mA)
Figure 1 Typical Tx Gain Characteristics Line Loss Compensation
(dB) +4 +3 +2 +1 0 -1 -2
Rx Gain
No LLC (AS2523, AS2524) LLC low (AS2523) LLC high (AS2523,AS2524B)
f = 800 Hz ZLINE = 600 VLS = -10 dBm VOL = 0 dB (neutral) 20 30
DC Line Current 40 50 60 70 80 (mA)
Figure 2 Typical Rx Gain Characteristics Line Loss Compensation
Revision 1.12, Preliminary
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Data Sheet AS2523, AS2524, AS2524B
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Serial Interface on AS2523
Registers
The settings of the AS2523 are stored in 16 registers. Each register has 4 bit data width.
Timing
The data format for writing to a register has the following form:
xCS CLK
DI
Note:
A3
A2
A1
A0
D3
D2
D1
D0
The pins xCS,CLK,DI have internal pull-up resistors.
Parameter CLK Pulse width HIGH CLK Pulse width LOW xCS to first falling CLKedge setup time DIN to CLK setup time DIN to CLK hold time
t5 t1 t3
Symbol T6 T5 T1 T3 T4
t6 t4
MIN 100ns 100ns 50ns 50ns 50ns
TYP
MAX
xCS CLK
DIN
Revision 1.12, Preliminary
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Data Sheet AS2523, AS2524, AS2524B
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Serial interface Registers
The following table shows the content of the 16 control registers.
Address AAAA 3210
0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 0 1 0
Data DDDD 3210
Nop
Control registers AS2523
Default value after reset
for AS2523, AS2524HF for AS2524 LH bond option
xx
xx
Conf-Tone:
0... No Conf Tone 1... Conf Tone
na na na na 0111
na na na na 0111
Conf
Llc1
Llc0
0...3.5V, 1...4.5V LIV: Voltage at pin LI LLC1 LLC0: Line loss compensation setting 0 0 20mA-50mA 0 1 NO Line loss compensation 1 0 45-75mA 1 1 NO Line loss compensation 0001 0...OFF, 1...ON BURS: Analog tone at RO 0...OFF, 1...ON BURL: Analog tone at LS CT1 CT0: @RO @LS 0 0 -36dB -15dB TONE-confidence level 0 1 -30dB -9dB rel. to pin LS 1 0 -24dB -3dB 1 1 -18dB +3dB Softclip-settings, Tx_comp_gain settings Bit1 Bit0 :Tx_comp_gain 0 0 +8dB 0 1 +11dB 1 0 +14dB 1 1 +17dB 0...OFF, SOFTRX: Softclip RX 0...OFF, SOFTTX: Softclip TX 1000 1000 0001
0101
Burs
Liv
CT1 Soft-RX
0110
xx
xx
tx_comp_gain Bit 1
tx_comp_gain Bit0
Soft-TX
CT0
Burl
1...ON 1...ON 0101 1100
0111
1000
16 gains
Bit1 Bit0: Rx-offset setting 0 0 0mV 0 1 12mV 1 0 40mV 1 1 100mV 0... no delay Delay_10ms 0... BGN off Bnon Handsfree receive endgain Data 0x0 : 0xF RXgain -20dB : +0dB TXgain -30dB -50dB
Rxoffset Bit1
Rxoffset Bit0
Delay_10ms
Bnon
1... 10ms delay 1... BGN on 1111 1011
Min. receive volume Max. receive volume 0000 1100
1001
xx
xx off1 off0: BGN-offset 0 0 120mV 0 1 180mV 1 0 240mV 1 1 300mV Hfs1 HFs0: Speed of voice switching 0 0 max speed 0 1 1 0 1 1 min speed Transmit gain [16], 16 steps, 1dB stepsize Data HS-mode HF-mode 0x0 30dB 39dB : : : 0xF 45dB 54dB Receive gain [16], 16 steps, 1dB stepsize Data 0x0 : 0xF HS-mode -6dB : +9dB HF-mode 19dB : 34dB
1... 1... 1... 1... fg=2000Hz Rxcomp=RECV Tx-path muted Ton in signal path
Hfs1
1010
16 gains
Hfs0
off1
off0
0111
0111
1011
16 gains
1111
1111
1100
Rec_on HP_on Tone Mute
1101
xx
xx
0... fg=200Hz HP_on : 0... Rxcomp=AGND rec_on : 0... No mute Mute : 0... Tx-signal path Tone : Mask, Lh, Hf, Hook Switch 0... No mask Mask: His 0 1 1 1 1 HF x 0 0 1 1 LH: x 0 1 0 1 Hook functions Power down Handset not allowed Handsfree Loudhearing
0100
1000
0100 1... Mask acitivated
0101
Mask
His
1110
xx
Test3 Krat5
xx
slow_rec Test2
LH
Hf
0000 slow_rec: fast change to TX, slow change to RX, no IDLE Krat5,Test3,Test2: For factory test only ! Reset to defaults na
0001
1111
x
xx
x
na
For a detailed description of the commands see Application note AN523/24.
Revision 1.12, Preliminary Page 9 of 19
Data Sheet AS2523, AS2524, AS2524B
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Additional settings in Handsfree mode
Note: change the default settings only if necessary: a) A click-free startup can be achieved by starting up in handset mode (=default) and then switching to handsfree, once the chip has stabilized. b) Change the Tx comparator preamplifier gain in register 6 Default = 14dB c) Change the Receive DC offset and Background noise monitoring in Register 7 default = 0mV offset (higher val. puts more weight on Rx) switching delay default = on Background Noise Monitoring = on d) Set the speaker amplifier volume in register 8 Default = 0B e) Set the handsfree voice switching speed and Background Noise monitoring offset in register 9: default voice switching speed = 1ms/6dB (fastest) default BGN monitoring offset = 240mV (determines the Tx level required to switch from idle to Transmit)
Programming Guidelines for the AS2523
The AS2523 is programmed by means of a serial 8-bit shift register. MSB is clocked in first, LSB last. The first four bits (7,6,5,4) are the addresses of the registers, the last four bits (3,2,1,0) are the data bits. Each register has a default setting (see data sheet), which is set after power-up of the chip. The internal registers are RAM-cells. When the AS2523 loses VDD (as in on-hook state) it also loses the register contents. It is therefore necessary to re-write the affected registers after each hook event. The register contents cannot be read, they can only be written. Registers need to be re-written after each power-up and after each hook event (handset / handsfree / on-hook). It is recommended to always initialize the chip with a "reset to defaults command" (Fx) first and then write the appropriate registers that need to be changed from the default setting. Alternatively, all registers (4 to 16) may be re-written in a bulk at each power-up and hook event (handset / handsfree / on-hook). This guarantees safe operation in case of unexpected loss of power during normal operation. Re-writing all registers also eases later software updates, as only register contents need to be changed, but no additional command lines need to be inserted.
Additional settings during Flash
During a Flash, the AS2523 should be powered down to avoid discharge of VDD: Set the MASK bit (bit3 in register D) to 1 After the line current is restored, the MASK bit must be cleared again. Other settings do not need to be re-written, as VDD has not discharged. As a safety margin however, it is recommended to re-write all registers after a flash
Additional settings during line breaks
If a line-break-detection (brief interruption of the line while in off-hook state) is implemented, the same rules apply as for a Flash: set the MASK bit to 1 to avoid discharge of VDD. It is recommended to re-write all registers after a line-break, as a line break may take long enough to discharge VDD, even when the MASK bit was set.
Example of a typical power-up sequence
A typical power-up sequence will require the following programming. a) determine the cause of power-up (handset / handsfree mode) and set register D accordingly. Default = handset mode b) Set the LI voltage to 3.5V or 4.5V (default = 4.5V) and Line Loss Compensation (default = off) in register 4 c) Set the Confidence Tone level (e.g. the DTMF level which is audible in the handset) and path in register 5 Default = off d) Set the required Tx and Rx gains in Registers A and B Default = 37dB Tx gain, 1dB Rx gain
General Rules
The serial interface may be programmed at any time, it does not affect the speech quality, e.g. if a register is overwritten with the same value. It is also possible to re-write all registers periodically. The register is static, therefore it can be clocked at any speed up to 5MHz. However, electromagnetic pulses on the clock and data lines may cause unwanted programming of the chip. It is therefore recommended to keep these lines short, filter them by a discrete lowpass filter and reduce the clock speed accordingly.
Revision 1.12, Preliminary
Page 10 of 19
Data Sheet AS2523, AS2524, AS2524B
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Parallel Interface on AS2524 and AS2524B
Input Signal on Pin XPD 0 0 0 0 1 1 1 1 xMute 0 0 1 1 0 0 1 1 HF 0 1 0 1 0 1 0 1 Mode Power down Power down Power down Power down Tone mode Tone mode Handset mode Handsfree mode
Power down mode
For low power consumption the analog part is turned off during activated power down mode. The Power down mode is used during Flash and Pulse dialing and for On-hook operation.
Handset mode
Speech mode is Handset mode (M1-M2, RO active; LO deactivated) Parameter LI Voltage LLC TX-Gain RX-Gain Rx-Softclip Tx-Softclip Tone AS2524 4.5V No LLC +37dB +7.5dB Off Off Off AS2524B 4.5V LLC high (45mA to 75mA) +43dB +7.5dB Off Off Off
Handsfree mode
Speech mode is Handsfree mode (M3-M4, RO active; LO active) Parameter LI Voltage LLC HF TX-Gain HF RX-Gain Rx-Softclip Tx-Softclip Tone BNM AS2524 4.5V No LLC +46dB +34dB Off Off Off On AS2524B 4.5V LLC high (45mA to 75mA) +52dB +34dB Off Off Off On
Revision 1.12, Preliminary
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Data Sheet AS2523, AS2524, AS2524B
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Tone mode
This mode is used to send DTMF and FSK data to the line. Speech mode is Tone mode (M1-M2;M3-M4 muted, Rx path muted, RO and LO active) Parameter LI Voltage LLC Tone TX-Gain Confidence tone level AS2524 4.5V No LLC +14dB -36dB@Ro -15dB@Lo relative to Pin LS AS2524B 4.5V LLC high (45mA to 75mA) +14dB -36dB@Ro -15dB@Lo relative to Pin LS
Loudhearing AS2524 and AS2524B (feature only available as DIE)
Speech mode is Loudhearing (M3-M4, RO active; LO activated). Loudhearing can be activated via a bond-option (see document "AS2523/24 Delivery as Dice"). Parameter LI Voltage LLC TX-Gain RX-Gain Tone Slow_rec RECV pin Highpass Voice switching speed RX-Offset AS2524 4.5V No LLC +37dB +7.5dB Off On Deactivated 2000kHz (10nF from TXO->TXV) 120ms/6dB 300mV AS2524B 4.5V LLC high (45mA to 75mA) +43dB +7.5dB Off On Deactivated 2000kHz (10nF from TXO->TXV) 120ms/6dB 300mV
Electrical characteristics
Electrical characteristics are measured with the Test Circuit application. Typical mean values will not be tested.
Absolute maximum ratings
Positive Supply Voltage Input Current Input Voltage (LS) Input Voltage (LI, CS) Input Voltage (STB, RI) Digital Input Voltage Electrostatic Discharge (HBM 1.5k-100pF) Storage Temperature -0.3V <= VDD <= 7V +/- 25mA -0.3V <= Vin <= 12V -0.3V <= Vin <= 8V -2V <= Vin <= VDD+0.3V -0.3V <= Vin <= VDD+0.3V +/- 1000V -65C to +125C
Recommended operating conditions
Supply Voltage (generated internally) Operating Temperature 3V <= VDD <= 5V -25C to +70C
Revision 1.12, Preliminary
Page 12 of 19
Data Sheet AS2523, AS2524, AS2524B
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DC characteristics
ILine=15mA w/o operation of any additional external circuitry, unless other specified Symbol Parameter Operating Current Operating Current Line Voltage LIVolt=0 Line Voltage LIVolt=1 Output Current, Sink CS,SS Conditions Speech Mode Handsfree Mode 15mA<=ILINE<=100mA 3.2 4.2 Min Type 3 7 3.5 4.5 1 Max 6 10 3.8 4.8 Units mA mA V V mA Test Y Y Y Y N
IDDS IDDH VLI IOL
VOL=0.4V
Transmit characteristics
ILine=15mA f=800Hz, default settings unless other specified Symbol Parameter Transmit Gain M1/M2 LS AS2524 AS2524B Transmit Gain M3/M4 LS AS2524 AS2524B Transmit Gain Tone LS
ATX
Conditions
Min
Type
Max
Units
Test
AM1/2TX
ZAC(syn)=1000
35 39 +36.5 +42.5 38 44 dB dB Y Y
AM3/4TX
ZAC(syn)=1000
43 49 +45.0 +51 +14dB 47 53 16 dB dB dB Y Y Y
Atone TX
ZAC(syn)=1000
f = 500Hz ... 3.4kHz 16 steps
12
Variation with frequency Control range M1/M2 LS
0.8 -7/+8
dB dBr
N N
AVRM12 AVRM34 THD VAGC1 VAGC2 ASCO tattack tdecay
Control range M2/M4 LS Distortion Soft Clip Level M1/M2 LS at LS Soft Clip Level M3/M4 LS at LS Soft Clip Overdrive M1/M2 - M3/M4 Attack time Decay time
16 steps
-7/+8
dBr
N
VLS=0.25VRMS
2
2
% VP
Y N
2
VP
N
20 70 100
dB us/6dB ms/6dB
N N N
Page 13 of 19
Revision 1.12, Preliminary
Data Sheet AS2523, AS2524, AS2524B
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Symbol
Parameter Input Impedance M1/M2 Input Impedance M3/M4 Input Voltage Range M1/2 - M3/4 Noise Output Voltage LS
Conditions
Min
Type 10 10
Max
Units k k Vp
Test N N N Y
ZIN-M1/2 ZIN-M3/4 VINmax VNO
differential
1 -72
TAMP=25C
Handset mode Gain = 36.5dB Mute activated 60
dBmp
AMUTE
Mute Attenuation
dB
Y
Receive characteristics
ILine=15mA f=800Hz, default settings unless other specified
Symbol
Parameter Receive Gain LS RO
Conditions
Min 6
Type +7.5
Max 9
Units dB
Test Y
ARO ALO12
ARX
ZAC(syn)=1000
Vol default
Receive Gain LS LO Variation with frequency Control range LS RO
ZAC(syn)=1000
Vol maximum f=500Hz to 3.4kHz 16 steps
+32.0
+34
+36.0
dB
Y
0.8 -7/+8
dB dBr
N N
AVRRO AVRLS THDLS THDRO VUFC
Control range LS LO Distortion LO Distortion RO Unwanted Freq. Cmp.
16 steps
-7/+8
dBr
N
VLS=0.25VRMS VLS =0.25VRMS
f = 200 ... 20kHz 1 1.1 10 70 100
5 2 -60
% % dBm VP VP dB us/6dB ms/6dB
Y Y Y N N N N N
VAGCRO Soft Clip Level
RO
VAGCLS ASCLS Tattack Tdecay
Soft Clip Level LO Soft Clip Overdrive LO Attack time Decay time
Revision 1.12, Preliminary
Page 14 of 19
Data Sheet AS2523, AS2524, AS2524B
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Symbol
Parameter Noise Output Voltage RO Input Imp. RI Input Voltage Range RI Input Imp. STB Input Volt. Range STB Side tone Return Loss Temp. Variation
Conditions
Min
Type
Max -68
Units dBmp
Test Y
VNO ZIN-RI VINmax ZIN-STB VINmax ST RL
ZAC/C
TAMP=25C
Gain = 7.5dB 8 2 80 2
k Vp k Vp dB dB
N
N
VRI<=0.25VRMS ZAC(syn)=1000
26 18 0.5
Y Y
/C
Test circuit
U2 15 C1 100uF C2 R1 30R D1 10V R1 600R VSS Vac VSS VSS Q1 BC327 VSS VSS Q1 14 22 C2 47uF VSS VDD 11 24 R1 6k VSS 10 16 R1 300R C2 10uF 13 12 1uF 9 STB M2 CS RO CI VSS VSSA SS VPP AS2523/24 RECI RECV LO xCS / xMUTE DI / xPD CLK / HFI CBN AGND TXO TXV FT 1 6 17 20 21 23 25 26 27 1 C2 1uF VSS C6 C2 C4 LS RI LI M4 M1 TONE IN M3 28 7 5 8 C6 C6 C6 C6 100nF 100nF V3 Vac 100nF 100nF Vac 100nF R3 R4 10k R5 10k VSS 150R VSS VSS Vac
I1 Idc
10uF 100nF 100nF
C6 C7
BC327
100uF R2 VSS 32R 3 2 1
18
22uF 19
1uF2
3
100uF C2
C2
C2
D1 5V1
4 C3 1n
VSS
Revision 1.12, Preliminary
Page 15 of 19
Data Sheet AS2523, AS2524, AS2524B
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Typical application AS2523
Revision 1.12, Preliminary
Page 16 of 19
Data Sheet AS2523, AS2524, AS2524B
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Typical application AS2524 and AS2524B
Revision 1.12, Preliminary
Page 17 of 19
Data Sheet AS2523, AS2524, AS2524B
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Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application.
Packaging
28-pin plastic SOIC For exact mechanical package dimensions please see austriamicrosystemsAG packaging information.
Pin-out, Marking
CBN 1 FT 1 2 TXO 3 TXV 4 M4 5 M2 6 M3 7 M1 8 ST B 9 CS 10 VSS 11 LI 12 RI 13 SS 14 28 TONE IN 27 CLK / HF I 26 DI / xPD 25 xCS / xMUTE 24 VSSA 23 LO 22 VPP 21 RECV 20 RECI 19 AGND 18 VDD 17 RO 16 CI 15 LS
YYWWAAA AS252X
Copyright
YY WW AAA X year of production calendar week of production austriamicrosystemsAG assembly ID 3 ... AS2523 Version 4 ... AS2524 Version 4B .. AS2524B Version Copyright (c) 1997-2002, austriamicrosystems AG, Schloss Premstaetten, A8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
Ordering Information
Number AS2523 T AS2524 T AS2524B T AS2523 F AS2524 F AS2524B F Package SOIC28 SOIC28 SOIC28 DOF DOF DOF Description plastic surface mounted package - 28 leads Plastic surface mounted package - 28 leads Plastic surface mounted package - 28 leads Dice-on-Foil Dice-on-Foil Dice-on-Foil
Revision 1.12, Preliminary
Page 18 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Contact
Headquarters
austriamicrosystems AG Communications Business Unit A8141 Schloss Premstaetten, Austria T. +43 (0) 3136 500-0 F. +43 (0) 3136 500-5692 www.austriamicrosystems.com
Sales Offices
Germany
austriamicrosystems Germany GmbH Tegernseer Landstrasse 85 D-81539 Munchen, Germany Phone: +49/89/693643-0 Fax: +49/89/693643-66
USA (east)
austriamicrosystems USA, Inc. Suite 400, 8601 Six Forks Road Raleigh, NC 27615, USA Phone: +1/919/676 5292 Fax: +1/919/676 5305
France
austriamicrosystems France S.a.r.l. 124, Avenue de Paris F-94300 Vincennes, France Phone: +33/1/43 74 00 90 Fax: +33/1/43 74 20 98
United Kingdom
austriamicrosystems UK, Ltd. Coliseum Business Centre, Watchmoor Park Camberley, Surrey, GU15 3YL, UK Phone: +44/1276/23 3 99 Fax: +44/1276/29 3 53
Italy
austriamicrosystems Italy S.r.l. Via Leone Tolstoi, 64 I-20146 Milano, Italy Phone: +39/0242/36713 Fax: +39/0242/290889
Japan
austriamicrosystems AG Shin Yokohama Daini, Center Bldg. 10F 3-19-5, Shin Yokohama Kohoku-ku, Yokohama 222-0033, Japan Phone: +81/45/474 0962 Fax: +81/45/472 9845
Switzerland
austriamicrosystems Switzerland AG Rietstrasse 4 CH-8640 Rapperswil, Switzerland Phone: +41/55/220 9000 Fax: +41/55/220 9001
Distributors & Representatives
austriamicrosystems AG is represented by distributors in the following countries. Please contact your nearest regional sales office for the distributor address: Spain, Israel, Korea, Hong-Kong, Taiwan, Malaysia, Singapore, India, Brazil
USA (west)
austriamicrosystems USA, Inc. Suite 116, 4030 Moorpark Ave, San Jose, CA 95117, USA Phone: +1/408/345 1790 Fax: +1/408/345 1795
Application Support
Please contact your local sales office or your distributor.
Revision 1.12, Preliminary
Page 19 of 19

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