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ICs for Cassette, Cassette Deck
AN7367K
dbx II Noise Reduction IC for Cassette Deck
s Overview
The AN7367K is an integrated circuit available for stereo operation on a single chip developed for dbx II type noise reduction, which can also use for U.S. sound multiplex TV. And it is designed for easy use of reference signal level, supply voltage and logic input level.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 8.40.3 4.80.25 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.50.1
0.3
+ 0.1 5 - 0.0
Unit : mm 0.90.25
s Features * Dynamic range : 110dB * 2-channel * Reference input-output signal level : 90mV * 2 power supply type (+, -)
26.70.3
1.050.25 3.050.25
3 ~ 15
10.160.25
28-Lead SDIP Package (SDIP028-P-0400A)
s Block Diagram
+VCC 28 27 26 25 24 23 22 21 20 19 18 17 16 15
-D+ +C- +E-
EOD
E OD E ODEOD
+A- -
-
F+
B+ L.S
BDE
1 GND
2
3
4
5
6
7
8
9
10
11
12
13
14 -VCC
1.778
AN7367K
s Absolute Maximum Ratings (Ta=25C)
Parameter Supply Voltage Supply Current Power Dissipation (Ta=75C) Operating Ambient Temperature Storage Temperature Symbol VCC ICC PD Topr Tstg
ICs for Cassette, Cassette Deck
Rating 7.2 30 450 -20 ~ + 75 -55 ~ + 150
Unit V mA mW C C
s Recommended Operating Range (Ta=25C)
Parameter Operating Supply Voltage Range Symbol VCC Range 5V ~ 7V
s Electrical Characteristics (VCC= 6V, Ta=25C )
Parameter Encode Output Voltage Encode Linearity -1 *1 Encode Linearity -2 *1 Decode Output Voltage Decode Linearity -1 *2 Decode Linearity -2 *2 Encode Max. Output Voltage Decode Max. Output Voltage Encode Total Harmonic Distortion Decode Total Harmonic Distortion Encode Noise Output Voltage Decode Noise Output Voltage Encode Output Defference between Channels Decode Output Difference between Channels Encode Crosstalk between Channels Decode Crosstalk between Channels Monitor Output Voltage Monitor Output Voltage Output Difference Between Channels Monitor Output Noise Output Voltage Monitor Output Total Harmonic Distortion dbx OFF Line Output Voltage dbx OFF Rec. Output Voltage dbx OFF line Output Total Harmonic Distortion dbx OFF Rec Output Total Harmonic Distortion dbx OFF Line Output Noise Output Voltage dbx OFF Rec. Output Noise Output Voltage dbx OFF Line Output Output Difference between Channels dbx OFF Rec. Output Output Difference between Channels Input Impedance Total Circuit Current
AN7367K Symbol
VOE LE - 1 LE - 2 VOD LD - 1 LD - 2 VOME VOMD THDE THDD VNOE VNOD CDE CDD CTE CTD VOM CDM VNOM THDM VLOFF VROFF THDLOFF THDROFF VNLOFF VNROFF CDLOFF CDROFF ZIN Itot
H4Condition
min. 67.5 8 - 22 67.5 17 - 43 300 1100
typ. 85 10 - 20 85 20 - 40
max. 107 12 - 18 107 23 - 37
Unit mV dB dB mV dB dB mV mV
Vin = 1kHz, 90mV (Reference Level) Vin = 1kHz, 900mV (Encode) Vin = 1kHz, 0.9mV (Encode) Vin = 1kHz, 90mV (Reference Level) Vin = 1kHz, 285mV (Decode) Vin = 1kHz, 9mV (Decode) THD = 3%, f = 1kHz THD = 3%, f = 1kHz At Encode, 400Hz ~ 30kHz, f = 1kHz, 90mV At Decode, 400Hz ~ 30kHz, f = 1kHz, 90mV Input short, DIN/AUDIO Input short, DIN/AUDIO Vin = 1kHz, 90mV Vin = 1kHz, 90mV At Encode *3, Vin = 1kHz, 900mV At Decode, Vin = 1kHz, 90mV At Encode, Vin = 1kHz, 90mV At Encode, Vin = 1kHz, 90mV Encode input, Short DIN/AUDIO At Encode, Vin = 1kHz, 90mV Vin = 1kHz, 180mV Vin = 1kHz, 180mV Vin = 1kHz, 180mV Vin = 1kHz, 180mV Input Short, DIN/AUDIO Input Short, DIN/AUDIO Vin = 1kHz, 180mV Vin = 1kHz, 180mV Vin = 1kHz, 90mV Input Short at Encode
0.35 0.1 - 62 - 96 - 1.3 -2 0 0 - 52 - 91 75 - 1.5 90 0 - 110 0.01 151 151 180 180 0.01 0.01 - 110 - 110 - 1.5 - 1.5 500 12 0 0
0.45 0.3 - 58 - 92 1.3 2 - 45 - 85 107 1.5 - 106 0.1 214 214 0.1 0.1 - 104 104 1.5 1.5 16
% % dBV dBV dB dB dBV dBV mV dB dBV % mV mV % % dBV dBV dB dB k mA
*1 Level Ratio to VOE *2 Level Ratio to VOD *3 Measure output leak by short of measuring channel input and input to reverse channel.
ICs for Cassette, Cassette Deck
s Electrical Characteristics (Cont.) (VCC= 6V, Ta=25C)
Parameter dbx ON/OFF Control dbx ON dbx ON/OFF Control dbxOFF Encode/Decode Control Encode Encode/Decode Control Decode dbx ON/OFF Control "L" Overflow Current Encode/Decode Control "L" Overflow Current Pulse Noise at Encode Symbol V15ON V15OFF V16EN V16DE I15L I16L VNPE Condition min. typ.
AN7367K
max. 6 1.8 6 1.8 - 0.2 - 0.2
Unit V V V V A A
Satisfy specifications of the preceding page VOE ~ VNLOFF 3.2 -VEE Satisfy specifications of the preceding page + 0.4V VOE ~ VNLOFF 3.2 Satisfy specifications of the preceding page VOE ~ VNLOFF -VEE Satisfy specifications of the preceding page + 0.4V VOE ~ VNLOFF V15=1.8V -2.1 V16=1.8V Input Short, Time : a second, number : one -2.1
13 mVP - P
s Characteristics Curve
20
Input/Output Characteristics (Playback Mode)
Input/Output Characteristics (Rec. Mode)
-10 -20 -30 Vout (dBV) -40 -50 -60 f=1kHz -100 - 80 - 60 - 40 - 20 0 0 THD Vout f=10kHz 0.8 0.4 VCC = 6V LPF = 30kHz HPF = 400Hz Din Audio - 62dBV
VCC = 6V LPF = 30kHz HPF = 400Hz 0 Din Audio - 98dBV f = 10kHz
-20 Vout (dBV) f=1kHz f=10kHz 1.6 1.2 THD (%) Vout
- 40
f = 1kHz
- 60
2 THD (%) 100k
-80 f = 1kHz THD -100 - 60 - 40 -20 0 Vin (dBV)
1
Vin (dBV)
0
Output Frequency Characteristics (Rec. Mode)
8 6 4 0 Vout (dB) Vout (dB) 2 0 -4 -8 - 12
Output Frequency Characteristics (Playback Mode)
Vout = 87.6mV = 0dB f = 1kHz 4 Vin = 90mV
Vout = 85.6mV = 0dB f = 1kHz - 2 Vin = 90mV f 1kHz *** LPF (30kHz) HPF (400Hz) -4 f <1kHz *** HPF (400Hz) 10 100 1k Frequency f (Hz) 10k 100k
10
100
1k Frequency f (Hz)
10k
s Pin Description
Pin No. 2 * 27 Pin Name Recording Signal Input Typ. Waveform Description Equivalent Circuit 2
0V + -
Pin for inputting signal
27
AN7367K
s Pin Description (Cont.)
Pin No. Pin Name Typ. Waveform Description
ICs for Cassette, Cassette Deck
Equivalent Circuit
+ -
3 * 26
Emphasis
Emphasis amp. - side input pin
3
26
+ -
4
25
4 * 25
Line Amp. Output
0V
Line amp. output pin
+ -
5 * 24
Emphasis Amp. Output
+ - 0V
+ -
Emphasis amp. output pin
5
24
6 * 23
Buffer Output
0V
Buffer output pin
+ -
6
23
7 * 22
7 CCA Input
0V
CCA input pin
22
8 * 21
CCA Output
0V
CCA output pin
8
21
9 * 20
+ -
CCA Amp. Input
0V
CCA amp. input pin 9
20
10 * 19
Rec. Out Output
0V
Rec. out output pin
+ -
10
19
ICs for Cassette, Cassette Deck
s Pin Description (Cont.)
Pin No. Pin Name Typ. Waveform Description
AN7367K
Equivalent Circuit
11 * 18
Level Sensor Input
-5.2V
Level sensor input pin 11
18
12 * 17
Timing Capacitor
-5.3V
Level sensor smoothing pin
12
17
13
Timing Current Adjusting Pin
Adjust the timing current by external variable resistance.
1k
13
103A
15
dbx ON/OFF Switching
High- dbx ON Low- dbx OFF
15
3.7k
103A
16 16 Encode/ Decode Switching High - Encode Low- Decode
3.7k
1 14 28
GND (-) Power Supply (+) Power Supply
AN7367K
s Precautions on Use
1) For the emphasis, RMS filter, and waiting C, R, use those resistors and capacitors which satisfy the following error ranges. (R ; 2%, C ; 5%) 2) For the timing capacitor, use a suitable one whose error is within 5% and whose tan is small enough. The selected timing capacitor must also has excellent temperature characteristics. 3) Adjust the timing adjustment pin so that the level on both 1k ends becomes 18.4mV. 4) If shortening of the power ON rise time is necessary, connect the timing capacitor as shown in the sketch below. 5)
ICs for Cassette, Cassette Deck
Encode THD The product specification is based on the data confirmed by use of a band-pass filter (400Hz ~ 30kHz). The distortion rate in the secondary to quintic higher harmonics measured by a spectrum analyzer is about 0.16%. 6) When users use the AN7367K, contract should be made between the dbx Technology Licensing. dbx license and trademark should be contacted with the following. the U.S.A. : dbx Technology Licensing 433 California Street. Third Floor San Francisco, California 94104 Tel : 415-765-2801 Fax : 415-765-2141 Japan Office : dbx Technology Licensing Tel : 03-3378-0915 Fax : 03-3374-5191
12/17
6V +
+
12/17
-6V
- 6V
Note)
Remember to make the power impedance low enough.

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