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ICs for Cassette, Cassette Deck
AN7374K, AN7376S
Dolby* B/C Type Noise Reduction IC
AN7374K
Unit : mm 0.50.1 4.80.25
0.3
+ 0.1 - 0.05
s Features * Fewer external parts * Spectral skewing circuit and anti-saturation circuit built* *
in. Available for double deck (Through signal output to REC output at PB mode.) Available for 2 or 1 power supply
26.70.3
The AN7374K, AN7376S are 2-ch dolby B/C type noise reduction ICs. Filter circuits (MPX filter driver and spectral skewing, etc.) are incorporated in 28-pin package. It can configure with very few external parts.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 8.40.3
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1.050.25 3.050.25
* Dolby is the trademark of Dolby Laboratories Licensing
Cor-poration.
3 ~15
10.160.25
28-Lead Shrunk DIP Package (SDIP028-P-0400A)
AN7376S
0.40.25 0.45
0.10.1
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.3
7.20.3 9.40.3
s Block Diagram
VCC 28 27 26 25 24 23 22 21 20 19
28-Lead SOP Package (SOP028-P-0375A)
18
17
16
15
Line Mpx-Dr VREF Stab VCR-H
Rect-H VCR-L OS-H
Rect-L
OS-L AS
+
Buff. Bias Switch Logic Buff.
SS
+
SS
+
AS
+
OS-H Mpx-Dr VREF IREF Line 1 GND 2 3 4 5 6 7 8 9 10 VCR-H Rect-H VCR-L
OS-L
Rect-L
11
12
13
14
0.925
0.15
2.00.2
17.810.3
1.27
1.778 Unit : mm
0.90.25
s Overview
AN7374K, AN7376S
s Absolute Maximum Ratings (Ta=25C)
Parameter Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC ICC PD Topr Tstg
ICs for Cassette, Cassette Deck
Rating 13.5 22 300 -30 ~ + 80 -55 ~ + 150
Unit V mA mW C C
s Recommended Operating Range (Ta= 25C)
Parameter Operating Supply Voltage Range AN7374K AN7376S Symbol VCC Range 9V ~ 13V or 4.5V ~ 6.5V 7V ~ 13V or 3.5V ~ 6.5V
s Electrical Characteristics (Ta=25C, VCC =12V, In the Dolby Reference Level ; 388mVrms (= - 6dBm) REC - OUT)
Parameter Quiescent Current Rec.- IN to Rec.- OUT Gain PB - IN to Rec.- OUT Gain MPX ON/OFF Gain Difference LINE - OUT Output Level AN7374K AN7376S 1 B Type Encode * Boost 2 3 4 1 2 C Type Encode * Boost 3 4 5 Signal * Handling Distortion SN Ratio Rec.PB Crosstalk PBRec. Ch.Ch. Mode Switching Offset Channel Balance PB Mode Control Voltage Rec. PBmpx C NR Control Voltage B off AN7374K AN7376S off C Symbol ICQ Grin Gpin DGmpx Vlout B-R-1 B-R-2 B-R-3 B-R-4 C-R-1 C-R-2 C-R-3 C-R-4 C-R-5 VOmax. THDoff THD - C S/N CT - R - P CT - P - R CT - C - C Voff D - GV VC - P VC - R VC - Pm VC - C VC - B VC - off Pin3 Applied Voltage Pin26 Applied Voltage Condition R/P R R P P Pm P R R R R R R R R R R R R R P R R R R NR off off off off off B B B B C C C C C off off C C off off off off C off 1k 1k 1k 1k 1k 1k 1k 10k 5k 1k 10k 1k 5k 300 5k 15k 1k 1k 1k f(Hz) Others No signal Vin = 0dB Vin = 0dB Vin = 0dB Vin = 0dB Vin = - 40dB Vin = - 30dB Vin = - 25dB Vin = 0dB Vin = - 60dB Vin = - 40dB Vin = - 30dB Vin = - 25dB Vin = 0dB THD VCC = 9.0V = 1% VCC = 7.0V Vin = 0dB Vin = 0dB Rg = 5.1k CCIR/ARM Vin = 0dB Vin = 0dB Vin = 0dB No signal 1k Vin = 0dB - 70 - 1.0 9.0 5.0 - 0.5 9.0 5.0 - 0.5 min. 12 17 22 -1 500 330 9.4 6.7 4.2 - 1.1 18.1 11.5 8.7 3.5 - 8.3 12 12 typ. 15 19 24 0 580 388 10.4 8.2 5.7 0.4 19.6 13.5 10.7 5.5 - 6.3 14 14 0.02 0.13 60.0 62.5 - 80 - 80 - 80 0 0 70 1.0 12.5 7.0 3.0 12.5 7.0 3.0 max. 19 21 26 1 Unit mA dB dB dB
670 mVrms 450 mVrms 11.9 9.7 7.2 1.9 21.6 15.5 12.7 7.5 - 4.3 dB dB dB dB dB dB dB dB dB dB dB % % dB dB dB dB mV dB V V V V V V
0.15 0.3
ICs for Cassette, Cassette Deck
s Application Circuits
AN7374K, AN7376S
* For 1 Power Supply
+VCC PB/Rec. Rec. In /PBmpx PB In 1F + 27 26 25 24 MPX FIL 2.4k 23 22 5.6k 1F 1500pF 21 20 19 1500pF 0.47F 18 17 16 15 Line Out 0.47F Rec. Out
1F + 28
AN7374K
1 1F
2 +
3 1F
4 + 2.4k
5
6
7 22k
8
9
10 1500pF
11
12
13
14
1500pF 0.47F
GND
Rec. In off/B/C
PB In
MPX FIL
5.6k
Line Out 0.47F
Rec. Out
* For 2 Power Supply
+VCC PB/Rec. Rec. In /PBmpx PB In 2.4k 1F + 28 27 26 1F + 25 24 23 22 21 MPX FIL 5.6k GND Line Out 0.47F 0.47F 1500pF 20 19 1500pF 18 17 16 15 Rec. Out
AN7374K
1 1F -VCC
2 +
3 1F
4 + 2.4k
5
6
7 22k
8
9
10 1500pF
11
12 0.47F
13
14
1500pF 0.47F
Rec. In off/B/C
PB In
MPX FIL
5.6k
Line Out
Rec. Out
Note)
When users use this product, licensing contract should be made between the Dolby Research Center. Details should be contacted with the following. Dolby Research Center. Tokyo Office (Far Eastan Continental Inc.) TEL : 03-3584-0039
AN7374K, AN7376S
Current consumption
30 28 26 Current consumption (mA) 24 C type 10kHz + 10dB 22 20 18 16 14 12 10 7 8 9 10 11 12 C type Vin = 0 OFF 10kHz + 10dB B type Vin = 0 13 14 15 B type 10kHz + 10dB Encode Mode Ta = 25C VCC- Current consumption (mA) 30 28 26 24
ICs for Cassette, Cassette Deck
Current consumption
Decode Mode Ta = 25C
C type 10kHz + 10dB 22 20 18 16 14 12 10 7 8 9 10 11 12 C type Vin = 0 OFF 10kHz + 10dB B type Vin = 0 13 14 15 VCC - Supply voltage (V) B type 10kHz + 10dB
VCC - Supply voltage (V)
B type encode characteristics
10 8 - 30 6 - 25 4 - 20 2 -5 0 100 200 500 1k 2k 5k 10k - 15 - 10 0 20k VCC = 12V - 40 - 35 16 Encode boost (dB) Encode boost (dB) 20
C type encode characteristics
- 60 - 40 12 8 - 30 4 0 -4 100 200 500 1k 2k 0 5k - 20 - 10
VCC = 12V
- 50
10k
20k
Frequency (Hz)
Frequency (Hz)
NR OFF total harmonic distortion
5.0 2.0 Encode Mode VCC = 12V 1.0 0.5 0.2 0.1 0.05 0.02 0.01 -30 -20 -10 0 10 20 100Hz 1kHz 10kHz 5.0
B type total harmonic distortion
2.0 Encode Mode VCC = 12V 1.0 0.5 0.2 0.1 0.05 0.02 0.01 -30 -20 -10 0 10 20 100Hz 1kHz 10kHz
Total Harmonic distortion (%)
Total Harmonic distortion (%)
Output level (dB)
Output level (dB)
C type total harmonic distortion
5.0 2.0 Total Harmonic distortion (%) 1.0 0.5 0.2 0.1 0.05 0.02 0.01 -30 -20 -10 0 100Hz 1kHz 10kHz 10 20 Signal handling (dB) Encode Mode VCC = 12V 26 24 22 20 18 16 14 12 10 8 6 7 8
Signal handling
Encode Mode f = 1kHz THD = 1%
NR OFF B type C type 9 10 11 12 13 14 15
Output level (dB)
VCC - Supply voltage (V)
ICs for Cassette, Cassette Deck
Crosstalk
PB Mode to Rec. Mode VCC = 12V 30kHz LPF - 20 Crosstalk (dB) - 40 - 60 - 80 - 100 100 200 500 1k 2k 5k 10k 20k C type B type NR OFF Crosstalk (dB) - 20 - 40 - 60 - 80 - 100 100 200 500 1k
AN7374K, AN7376S
Crosstalk
Rec. Mode to PB Mode VCC = 12V 30kHz LPF
C type B type NR OFF
2k
5k
10k
20k
Frequency (Hz)
Frequency (Hz)
Crosstalk
Rec. Mode ch to ch VCC = 12V 30kHz - 20 Crosstalk (dB) - 40 - 60 - 80 - 100 100 200 500 1k 2k 5k 10k 20k C type B type NR OFF Crosstalk (dB) LPF - 20 - 40 - 60 - 80 - 100 100 200 500
Crosstalk
PB Mode ch to ch VCC = 12V 30kHz LPF
C type B type NR OFF
1k
2k
5k
10k
20k
Frequency (Hz)
Frequency (Hz)
S/N Total Gain
PB IN to PB OUT (mode : PB, OFF) PB IN to Rec. OUT (mode : PB, OFF) Rec. IN to PB OUT (mode : Rec., OFF) Rec. IN to Rec. OUT (mode : Rec., OFF) 30 28 26 24 22 20 18 16 100 VCC = 6V 200 500 1k 2k 5k 10k 20k Frequency (Hz) 50 60 Rec. * C 100 CCIR/ARM 90 Rec. * OFF Rg = 5.1k
PB * B PB * C PB * OFF
Total Gain (dB)
S/N (dB)
80
70
Rec. * B
7
8
9
10
11
12
13
14
15
VCC - Supply voltage (V)
NR control voltage threshold
20 Mode : NR OFF, B, C 18 16 Control voltage (V) C type 12 10 8 B type 6 4 2 0 7 8 9 10 11 NR OFF Control voltage (V) 14 18 16 14 20
NR control voltage threshold
Mode : Rec., PBd, PBm
PBd (direct) 12 10 8 Rec. (MPX ON) 6 4 2 PBm (MPX ON)
12
13
14
15
0
7
8
9
10
11
12
13
14
15
VCC - Supply voltage (V)
VCC - Supply voltage (V)
AN7374K, AN7376S
s Pin Description
Pin No. 1 Pin Name GND Input Impedance Pin Voltage 0 Pin Description Single Supply : Ground Pin
ICs for Cassette, Cassette Deck
Equivalent Circuit
VCC
2, 27
Rec. IN
62k VCC/2
200
Record Input Pin
62k
GND
VCC
60k
3
OFF/B/C
70k VCC/2
C-type/B-type/NR OFF Changeover Switching Pin
10k
GND
VCC
4, 25
PB IN
40k VCC/2
200
Playback Input Pin
40k
GND
VCC
5, 24
MPX OUT
70 VCC/2
MPX Drive Amp. Output Pin
70
GND
VCC
6, 23
MPX IN
VCC/2
MPX Gain Aux. Amp. Input Pin
70
GND
ICs for Cassette, Cassette Deck
s Pin Description (Cont.)
Pin No. Pin Name Input Impedance Pin Voltage Pin Description
AN7374K, AN7376S
Equivalent Circuit
VCC
7, 22
VREF
0 VCC/2
Reference Voltage Output Pin
GND
VCC
8
IREF
1.2V
Internal Resistor Error Calibration Pin
70
700
GND
VCC
9, 20
LINE OUT
40 VCC/2
40
Playback Output Pin
GND
VCC
10, 19
VCR H
VCC/2
HLS Side Chain Control Resistor Pin
30
GND
VCC
11, 18
RECT H
0.5V
HLS Control Signal Smoothing Pin
GND
AN7374K, AN7376S
s Pin Description (Cont.)
Pin No. Pin Name Input Impedance Pin Voltage Pin Description
ICs for Cassette, Cassette Deck
Equivalent Circuit
VCC
12, 17
VCR L
VCC/2
LLS Side Chain Control Resistor Pin
30
GND
VCC
13, 16
RECT L
0.5V
LLS Control Signal Smoothing Pin
GND
VCC
14, 15
Rec. OUT
60 VCC/2
60
Record Output Pin
GND
VCC 50k
21
VRIN
25k VCC/2
Reference Voltage Input/Ripple Rejection Pin
50k GND
VCC
60k
26
PB/Rec. /PBmpx
70k VCC/2
Playback/Record/Playback - mpx MODE Switching Pin
10k
GND
28
VCC
Supply Voltage Pin

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