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Ordering number : ENA1859B
Monolithic Linear IC
LA72914V
Overview
FM Modulator and Demodulator IC
The LA72914V is a FM modulation and demodulation IC for audio signals. And it is possible to use that for the data pulse or the control pulse, etc.
Functions
* Alignment-free FM modulator and demodulator of 4.5MHz. * Alignment-free FM modulator and demodulator of 6.5MHz. * ALC/ FMAGC, Emphasis/ De-emphasis * Carrier frequency adjustment function, Standby switch
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 70C * Conditions Ratings 7.0 300 -20 to +70 -40 to +150 Unit V mW C C
When mounted on a 114.3mm x 76.1mm x 1.6mm, glass epoxy.
Recommended Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Allowable operating voltage range Symbol VCC VCC op Ta=25C Ta = -20 to +70C Conditions Ratings 5.0 4.7 to 5.5 Unit V V
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
D0110 SY 20101118-S00005/N0410 SY/O2710 SY 20101008-S00006 No.A1859-1/9
LA72914V
Electrical Characteristics at Ta = 25C, VCC = 5V DC Characteristic
Parameter 2.4V regulator Current dissipation Symbol VREG ICC1 ICC2 Control pin (6 pin) Low level Control pin (6 pin) Middle level Control pin (6 pin) High level AGC stop at pin 11 control voltage TX OFF mode at pin 16 control voltage CNT16L Voltage of input pin (pin 16) in TX off mode 0 0.4 V AGCS Voltage of input pin (pin 11) in AGC stop 4.5 5.0 V CNT6H High level of input pin (6pin) in 6.5MHz TX mode. 4.5 5.0 V CNT6M Middle level of input pin (6pin) in stand-by mode. 2.0 3.0 V CNT6L Conditions min Ratings typ 2.4 33.0 2.5 max 2.6 40.0 3.0 0.4 V mA mA V Unit
Measure the DC voltage at pin 2 Measure the current into pin 4 in normal mode. Measure the current into pin 4 in stand-by mode.
Low level of input pin (6pin) in 4.5MHz TX mode.
2.2 26.0 2.0 0
Sound FM Modulation Block (TX)
Parameter FM carrier output frequency FM carrier output level Symbol FFM1 FFM2 VOFM1 VOFM2 FM carrier output second harmonics distortion 2HD1 2HD2 VFMT DEV FEMP Conditions Output frequency of T1B in no signals. T6=0.6V, T14:open Output frequency of T1B in no signals. T6=4.2V, T14:open Output level of T1B in no signals. Load impedance = 1k T1-GND. T6=0.6V Output level of T1B in no signals. Load impedance = 1k T1-GND. T6=4.2V 2nd harmonics distortion of T1B in no signals. Load impedance = 1k T1-GND. T6=0.6V 2nd harmonics distortion of T1B in no signals. Load impedance = 1k T1-GND. T6=4.2V FM carrier output mute level FM deviation Emphasis Characteristic ALC characteristic Output level of T1B in TX off mode. T6=0.6V (4.2V) FM deviation of T1A, T6=0.6V (4.2V), input at T16=1.0Vp-p/1kHz (sine) T16=200mVp-p, 1kHz (sine), M1=T1 output deviation. T16=200mVp-p, 5kHz (sine), M2=T1 output deviation. FEMP=M2-M1 T16A=0.25Vp-p, 1kHz (sine), T3:Open, T6=0.6V, T3 output level T16A=0.6Vp-p, 1kHz (sine), T3:Open, T6=0.6V, T3 output level T16A=1.0Vp-p, 1kHz (sine), T3:Open, T6=0.6V, T3 output level No signal input. Measure T1B frequency. T16:Open, T6=0.6V (4.2V), T14=0.5V No signal input. Measure T1B frequency. T16:Open, T6=0.6V (4.2V), T14=4.5V 20 7 -60 25 12 -50 30 17 dB kHz kHz -30 -20 dB -30 -20 dB 1.3 1.7 2.1 Vp-p Ratings min 4.455 6.435 1.9 typ 4.500 6.500 2.3 max 4.545 6.565 2.6 Unit MHz MHz Vp-p
ALC1 ALC2 ALC3
0.45 0.9 0.95
0.5 1.0 1.05 -0.22 +-.22
0.55 1.1 1.15
Vp-p Vp-p Vp-p MHz MHz
FM carrier "fo" adjustment (reference)
FCNT1 FCNT2
Sound FM demodulation block (RX)
Parameter Sound demodulation level Symbol VOUT1 Conditions Input signal: CAR=4.5MHz, DEV=25kHz, MOD=1kHz, Level: 100mVp-p. T5A input. Measure T9B signal level. (T9B-GND: ROUT=10k) T6=4.2V VOUT2 Input signal: CAR=6.5MHz, DEV=25kHz, MOD=1kHz, Level: 100mVp-p. T5A input. Measure T9B signal level. (T9B-GND: ROUT =10k) T6=0.6V S/N SN1 Input signal: CAR=4.5MHz, No-modulation. Level: 100mVp-p. T5A input. T6=4.2V, (IHF-A) M1=T9B signal level. (T9B-GND: ROUT =10k) SN1=20log(VOUT1/M1) Input signal: CAR=6.5MHz, No-modulation. Level: 100mVp-p. T5A input. T6=0.6V, (IHF-A) M1=T9B signal level. (T9B-GND: ROUT =10k) SN1=20log(VOUT2/M1) 35 50 dB 0.7 1.0 1.4 Vp-p Ratings min 0.6 typ 0.9 max 1.3 Unit Vp-p
SN2
35
50
dB
Continued on next page
No.A1859-2/9
LA72914V
Continued from preceding page.
Parameter THD Symbol THD1 THD2 De-emphasis characteristic DEEM1 Conditions Same condition VOUT1. Measure T9B signal. Same condition VOUT2. Measure T9B signal. Input signal: CAR=4.5MHz, DEV=25kHz, MOD=5kHz, Level: 100mVp-p. T5A input. T6=4.2V, M1=T9B signal level. DEEM=20log(M1/VOUT1) Input signal: CAR=6.5MHz, DEV=25kHz, MOD=5kHz, Level: 100mVp-p. T5A input. T6=0.6V, M1=T9B signal level. DEEM=20log(M2/VOUT2) T11=4.5V, T6=4.2V, T5A=4.5MHz, 100mVp-p. T12A=A1. T5A=6.5MHz. 100mVp-p. T12A=B1. TRP1=20log(B1/A1) T11=4.5V, T6=0.6V, T5A=4.5MHz, 100mVp-p. T12A=A1. T5A=6.5MHz. 100mVp-p. T12A=B1. TRP2=20log(A1/B1) T6=4.2V. T5A=4.5MHz, 300mVp-p. Measure T12 signal level. T6=0.6V. T5A=6.5MHz, 300mVp-p. Measure T12 signal level. T6=4.2V. T5A=4.5MHz, 30mVp-p. Measure T12 signal level. T6=0.6V. T5A=6.5MHz, 30mVp-p. Measure T12 signal level. T6=4.2V. T11=4.5V, T5A=4.5MHZ, 100mVp-p. Measure T12 signal level. AGCSTP2 FM input sensitivity FMIN1 T6=0.6V. T11=4.5V, T5A=6.5MHz, 100mVp-p. Measure T12 signal level. Input signal: CAR=4.5MHz, DEV=25kHz, MOD=1kHz, T6=4.2V. When T9B signal is OK, then measure T5A FM input level range. Input signal: CAR=6.5MHz, DEV=25kHz, MOD=1kHz, T6=0.6V. When T9B signal is OK, then measure T5A FM input level range. 30 100 300 mVp-p 70 100 140 mVp-p 250 250 200 200 70 Ratings min 0 0 -10 typ 0.3 0.3 -7.5 max 1.0 1.0 -5 Unit % % dB
DEEM2
-10
-7.5
-5
dB
Trap-filter characteristic
TRP1 TRP2
-20 -20 350 350 300 300 100
-15 -15 450 450 400 400 140
dB dB mVp-p mVp-p mVp-p mVp-p mVp-p
FM AGC characteristic
AGC1 AGC2 AGC3 AGC4
FM AGC STOP characteristic
AGCSTP1
FMIN2
30
100
300
mVp-p
Package Dimensions
unit: mm (typ) 3178B
5.2 16 9
4.4
6.4
1 0.65 (0.33)
8 0.15 0.22
1.5max
SANYO : SSOP16(225mil)
0.1
(1.3)
0.5
No.A1859-3/9
LA72914V
Pin Layout and Measurement circuit
Sign: Highly accurate part use T1B T1 T16
FM_out
1 FM_out
T2
Audio_in /TX_CTL 16 ALC filter 15
T16A AUDIO_IN T15
T3
VREG filter 2 (2.4V) Emphasis 3 filter
+
T14
VCO_CTL 14 GND 13 FMAGC 12 monitor
T12 FMAGC_OUT T11
Power supply (VCC) 5V
A T5 T5A FM_IN T6
4
VCC(5V)
5 FM_IN
MODE_CTL T7 De-emphasis T8
Mode control 6 (TX,RX/STBY) AGC filter 11 7 De-emphasis filter FM filter 10
+ +
T9B
T10
T9
GND
De-emphasis 8 Audio_in
Audio_out 9
+
Top view
Block Diagram and Application Circuit
TX control (High:TX-OFF /Low:TX-ON)
ALC Filter
VCO Auto tune
FMAGC-OUT Monitor
AGC Filter
FM Filter
Audio-OUT (1Vp-p)
16
15
14
13
12
11 FMAGC-DET Phase Detector VCO 6.5M/4.5M Mode & Standby Control T4R6/STBY/T6R
10
9
Bias 2.4V 6dB AMP
ALC (1.0Vp-p) 10k LPF Emphasis
FMAGC
6dB-AMP DRIVER Loop Filter Offset Cancel De-emphasis
FMMOD FM-AMP DRIVER 1
VCO 4.5M/6.5M VREG 2.4V 2
6800pF
TRP 4.5M/6.5M 3 4
1000pF
Bias 2.4V 6 7 8
5
BPF
FM-OUT (2Vp-p)
Ripple Filter
Emphasis Filter
VCC(5V)
FM-IN (0.1Vp-p)
State control T6R4:P-Up STBY:Open T4R6:P-Down
De-emphasis Filter
: Push-pull output
+
+
+
No.A1859-4/9
LA72914V
Pin Description
Pin No. 1 Pin Name FM OUT Description 4.5MHz or 6.5MHz FM carrier output. Push-pull output pin. Output level is 2.5Vp-p (Load resistance=1k) Equivalent circuit
1
2
2.4V REG Filter
Internal regulator filter pin. Please connect 0.1F (C1)
4V VCC
2
C1
3
Emphasis Filter
Emphasis filter pin. Before FM modulation, make emphasis Characteristic at audio signal. C1(6800pF) Emphasis time constant must be matching de-emphasis time constant. (If you don't need the emphasis, this pin is open.)
3
C1
4
VCC
VCC pin. Supply voltage is 5V DC. Please connect de-coupling capacitor. (about 47F) FM signal input. Please use capacitor coupling.
5
FM IN
C1
SIG
5
2.4V
6
Mode CTL
MODE control pin. Control modulation frequency TX=4.5MHz: 0 to 0.4V Stand-by: 2.0 to 3.0V TX=6.5MHz: 4.5V to VCC
6
Continued on next page.
No.A1859-5/9
LA72914V
Continued from preceding page.
Pin No. 7 Pin Name De-emphasis Filter Description De-emphasis filter pin. De-emphasis time constant must be matching at emphasis time constant. Recommend value is 6800pF to 0.01F. Connect Cap. Coupling to pin8. Equivalent circuit
SIG
C1
7
8
RX Audio IN
Internal DC bias is 2.4V. Please connect Cap. coupling.
8
C1
2.4V
9
Audio OUT
Audio signal output pin. Push-pull output pin. Output level is 1.0Vp-p at 1kHz. (Load resistance=10k)
9
10
FM Filter
FM demodulator filter pin. Please connect 1.0F capacitor. (If you need rising of low frequency gain, then change more large capacitor in use.)
10
11
AGC Filter
FM AGC filter pin. Please connect 0.1F capacitor. If you need reduce AGC-gain, then connect resistor (R1: 11pin-VCC) If FM AGC no need, please set pin11 voltage over 4.5V DC voltage.
AGC-DET
R1
11
C1
Continued on next page.
No.A1859-6/9
LA72914V
Continued from preceding page.
Pin No. 12 Pin Name AGC monitor FM AGC monitor pin. Description Equivalent circuit
12
13
GND
GND pin.
14
VCO CTL
Modulation frequency fine control pin. Adjustment frequency is, about 220kHz at 0.5V to 4.5V DC.
VR1
14
C1 2.4V
15
ALC CTL
Audio ALC filter pin. Please connect 0.47F capacitor.
15
C1
16
TX Audio IN (TX-OFF_CTL)
Audio signal input pin. Internal bias is 2.4V DC. Please use capacitor coupling. If DC voltage set to under 0.4V DC, then modulator circuit stops. Demodulation circuit is work. This is receiving only mode. (TX-OFF: 0 to 0.4V)
C1
16
2.4V
Signal processing outline [Modulation block]
* Audio signal is input from pin16. (Internal bias is DC 2.4V.) Go through AMP (6dB)/ALC/LPF (10 kHz) and emphasis circuit, then input FM-modulation block. After FM-modulation block, go to output driver block then FM-audio signal output from pin1. * ALC: ALC circuit work at pin16 input level over than 0.5Vp-p. * LPF: LPF gain is -3dB at 10 kHz and -6dB/oct. Keep over modulation from emphasis characteristic. * Emphasis circuit: The pin3 owns an Emphasis characteristic which connected capacitor. Recommended value = 6800pF. * FM modulation: Carrier frequency is choosing from pin6 voltage. When pin16 input level is 0.5Vp-p, then FM deviation set to 25 kHz. Internal LPF reduce harmonic spectrum. * Output Driver: Output AC voltage is about 2.0Vp-p. (Load resistance: 1k)
No.A1859-7/9
LA72914V
[De-modulation block] * Demodulate audio signal from modulated audio signal. * FM-Audio signal is input from pin5. Go through 4.5M-Trap-filter or 6.5MHz-Trap-filter and AGC go to demodulator. After demodulator go to De-emphasis circuit. After de-emphasis circuit signal is output pin7. Pin7 signal is charge to DC bias for coupling capacitor at pin8. Audio signal from pin8 go to 6dB AMP then output from pin9. (Door-phone application, there are two FM carrier. In this case we recommend add BPF before pin5 FM-Audio signal input.) * 4.5M/6.5MHz-Trap-filter: Internal Trap-filter is change for pin6 mode control. (If modulator frequency is 4.5MHz, then internal Trap-filter is 4.5MHz.) * AGC: After AGC level is control about 0.3Vp-p. After AGC signal go to pin12 FM-monitor and de-modulator. * De-emphasis circuit: The pin7 owns an De-emphasis characteristic which connected capacitor. Recommended value = 10nF. * Output signal level: If input FM signal deviation is 25 kHz, then output signal level is 1Vp-p (TYP) from pin9/ (Load resistance: 10k at 1 kHz.)
Characteristics
ALC characteristics FMAGC characteristics
fo=4.5MHz (unmodulated signals)
2000 500
2500
600
Internal level of IC, [mVp-p]
6dB
1500
Output level, [mVp-p]
400
Pin 12
300
1000
Pin 9 ALC Pin 16
200
500 100
0 0 200 400 600 800 1000 1200
0 1 10 100 1000 10000
Input level, [mVp-p]
3
Input level, [mVp-p]
Frequency responce TxIn-RxOut
0
Output level, [dB]
-3
-6
-9
-12
-15 0.01
0.1
1
10
100
Frequency, [kHz]
No.A1859-8/9
LA72914V
Application example
WIRE
BPF 4.5MHz RX 4.5MHz MIC LA72914V (pin6:High) LPF 6.5MHz TX 6.5MHz LPF 4.5MHz TX 4.5MHz
BPF 6.5MHz RX 6.5MHz LA72914V (pin6:Low) MIC
[Above-mentioned recommendation BPF] Made by Murata Mfg.: SFSKA4M50DF00 (4.5MHz)/SFSKA6M50CF00 (6.5MHz)
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This catalog provides information as of Novenber, 2010. Specifications and information herein are subject to change without notice. PS No.A1859-9/9

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