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ICs for Cassette/Cassette Deck Use
AN7356NSC
Recording and playback equalizer amp. IC for Hi-Fi cassette deck
■ Overview
The AN7356NSC is an audio signal processing IC for
analog cassette deck. All the recording and playback processing can be realized with one chip.
■ Features
• Control various adjustment circuit by serial data
• Playback system
• Built-in variable volume circuit (±6 dB) for playback
gain adjustment
• Built-in various equalizer switching circuit
• Built-in series mute circuit
• Recording system
• Built-in equalizer (freq. characteristics, gain) circuit of
middle and high frequencies
• Built-in volume circuit (+20 dB) for overall gain
adjustment
• With low frequency band boost pins
• Built-in drive circuit for current output
• With parallel data output
■ Applications
• Cassette deck (Hi-Fi)
1
0.45
0.35±0.1
1.0
21
0.1±0.1
0.3
42
22
9.5±0.3
11.5±0.3
SSOP042-P-0450A
0.15
Unit: mm
2.0±0.2
0.9
21.25±0.3
1
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AN7356NSC ICs for Cassette/Cassette Deck Use
■ Block Diagram
−V
EE
T1
T2
PB out
V
CC
Rec.in
1
2
3
4
PBPB
EQ-VR EQ-VR
5
VCA
REG
VCA
6
LPF
7
600
8
9
Rec.
Rec.
10
11
12
Q/FF/FR
Fm/GH
L-boost
Q/FF/FR
Fm/GH
13
14
VCA
L-boost
LPF
600
VCA
42
41
40
39
38
37
36
35
34
33
32
31
30
29
GND
T1
T2
PB out
Rec. in
V
OUT
I
OUT
Bias 1
Bias 2
FET
15
16
17
18
19
DAC DAC S/P S/P
DA
L
DA
L
DA
L
DA
L
28
27
26
25
24
V
OUT
I
OUT
Inj.
V
DD
D-GND
Address
−V
EE
20
Shift register
21
I
E
23
22
S-data
CLK
2
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ICs for Cassette/Cassette Deck Use AN7356NSC
■ Pin Descriptions
Pin No. Description
1 Negative supply pin
2 Playback amp. TAPE1 input
3 Playback amp. TAPE2 input
4 Playback amp. negative feedback input
5 Playback amp. equalizer pin
6 Playback amp. negative feedback output
7 LPF pin
8 Playback amp. output
9 Positive supply pin
10 Recording amp. non-inverting input
11 Low frequency band boost pin
12 DAC output pin(Addr.: 02)
13 Recording equalizer amp. output
14 Recording volume amp. input
15 Recording amp. voltage output
16 Recording amp. current output
17 DAC output pin(Addr.: 0A)
18 DAC output pin (Addr.: 09)
19 FET drive current output
20 Negative supply pin
21 Erase current output
Pin No. Description
22 Clock input
23 Serial data input
24 GND pin
25 Positive supply pin
26 Injector current pin
27 Recording amp. current output
28 Recording amp. voltage output
29 Recording volume amp. input
30 Recording equalizer amp. output
31
32 Low frequency band boost pin
33 Recording amp. non-inverting input
34 DAC calibration pin
35 Playback amp. output
36 LPF pin
37 Playback amp. negative feedback output
38 Playback amp. equalizer pin
39 Playback amp. negative feedback input
40 Playback amp. TAPE2 input
41 Playback amp. TAPE1 input
42 GND pin
■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage V
Supply current I
2
Power dissipation
Operating ambient temperature
Storage temperature
Note)*1 : All items are at Ta = 25°C, except for the operating ambient temperature and storage temperature.
*2 : Power dissipation of the IC single unit at Ta = 75°C. Use the IC under the conditions of not exceeding the allowable power
dissipation curve.
*
1
*
1
*
CC
V
DD
CC
P
D
T
opr
T
stg
±7.7 V
+7.7
mA
443 mW
−25 to +75 °C
−55 to +150 °C
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage V
CC
V
DD
±4.5 to ±6.5 (typ.) to ±7.2 V
4.5 to 5.0 to 5.5
3
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AN7356NSC ICs for Cassette/Cassette Deck Use
■ Electrical Characteristics at VCC = ±6.5 V, Ta = 25°C
Parameter Symbol Conditions Min Typ Max Unit Note
Playback system VIN = −56 dBV, f = 1 kHZ, 30 kHz LPF on
Reference output level
Reference output level (+6 dB)
Reference output level (−6 dB)
Level difference between ∆G
tapes
Total harmonic distortion (T1, 0 dB)
Total harmonic distortion (T2, 0 dB)
Output noise voltage (T1, 0 dB)
Output noise voltage (T2, 0 dB)
Maximum output level (0 dB)
Cross talk (ch. R → ch. L) CT
Cross talk (ch. L → ch. R) CT
Output offset voltage (0 dB) V
Mute attenuation (T2) G
Mute attenuation (T1) G
Mute attenuation (T2) G
Pulse noise voltage ∆V
EQ-VR (120 µ)V
EQ-VR (70 µ)G
EQ-VR (50 µ)G
600 Hz LPF (50 µ)G
T1/T2 switching shock noise ∆V
Recording system
Reference output (EQ output)
Middle and high High G
frequency gain Low ∆G
High frequency High G
peak gain Low ∆G
(0 dB) V
THD1VIN = −64 dBV, 30 kHz LPF on 0.12 0.4 %
THD2VIN = −64 dBV, 30 kHz LPF on 0.12 0.4 %
V
V
V
V
1
G
H
G
L
T12
NO1
NO2
OMX
1
2
OFF
M0
M1
M2
P
EQ120
EQ70
EQ50
LPF
T12
EQ
HH
HL
PH
PL
−3.4 −1.4 0.6 dBV Data(1)
Difference between 6 dB and 0 dB
5.0 6.0 7.0 dB Data(2)
GH = data (2)−data (1)
Difference between −6 dB and 6 dB
10 11.8 13.5 dB Data(3)
GL = data (2)−data (3)
Operation: The above reference output
01dB
level (V1) difference between tapes
IHF−A, Rg = 2.2 kΩ−69 −56 dBV
IHF−A, Rg = 2.2 kΩ−69 −56 dBV
THD = 3% 2.0 3.6 dBV
Rg (CH2) = 220 Ω 60 dB
Rg (CH1) = 220 Ω 60 dB
Rg = 220 Ω−450 +130 mV
DAC5 = (08) 60 dB
T2 mode 60 dB
T1 mode 60 dB
Rg = 2.2 kΩ09mV
f = 10 kHz −7.3 −5.3 −3.3 dBV Data(17)
f = 10 kHz −5.0 −4.0 −3.0 dB Data(18)
G
= data (18)−data (17)
EQ70
f = 10 kHz −8.5 −7.5 −6.5 dB Data(19)
G
= data (19)−data (17)
EQ50
f = 10 kHz −25 −20 dB Data(23)
G
= data (23)−data (19)
LPF
Operation: The above output offset
voltage (V
) difference between tapes
OFF
−55 0 55 mV
fIN = 400 Hz, VIN = 6 dBV −3 −0.5 2.0 dBV
V (400 Hz) = 0 dB fIN = 10 kHz 3.0 5.0 7.0 dB
V
= −12 dBV
∆GHL = data
IN
10 13 15
Data (32H)
Data (32L)
(32H)−data (32L)
V(400 Hz) = 0 dB fIN = 25 kHz 18 21 22 dB
= −30 dBV
V
∆GHL = data
IN
18 12 24
Data (33H)
Data (33L)
(33H)−data (33L)
4
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ICs for Cassette/Cassette Deck Use AN7356NSC
■ Electrical Characteristics at VCC = ±6.5 V, Ta = 25°C (continued)
Parameter Symbol Conditions Min Typ Max Unit Note
Recording system (continued)
High frequency peak
bandwidth
(10 kHz output)
High frequency peak
frequency DAC control
Volume amp. gain High G
(VOL output) Low ∆G
Total harmonic VOL THD
distortion RLV = 10 kΩ
Maximum output VOL V
voltage CURR V
Output noise voltage V
(curr. output) IHF-A
Input muting attenuation IM
(EQ output)
Output offset voltage V
(EQ output)
Output offset voltage V
(curr. output)
Output muting attenuation OM
(VOL output) DAC (GTL) = (10)
Pulse noise voltage V
(curr. output)
Logic system
Bias output (low) V
Bias control width ∆V
Current consumption
Analog +V
Digital +V
−V
CC
DD
EE
Wide G
NAR ∆G
High D
Low D
CURR THD
O-RV
O-RC
N-RC
OF-EQ
OF-RC
PN
I
VCC
I
VDD
I
VEE
V(25 kHz) = 0 dB
QW
∆GHL = data (34W)
QL
−Data (34N)
fIN = 44 kHz
fPH
fIN = 11 kHz (0D) (10) (13)
fPL
TH
∆GTL = data (36H)
TL
−data (36L)
RVVIN
RCVIN
= −14 dBV fIN = 1 kHz 0.3 0.8 %
= −20 dBV 0.3 0.8
f
(peak)
= 25 kHz
2.7 4.7 6.7 dB
f = 35 kHz 14 16 18
VIN = −18 dBV
VIN = −30 dBV
VIN = −18 dBV
(2D) (30) (3B)
17 19 21 dB
fIN = 1 kHz 16.3 18.3 20.3
(VR input)
RLV = l kΩ
RLV = 10 kΩ fIN = 1 kHz 2.2 3.2 V[rms]
RLV = 1 kΩ THD = 3% 1.0 1.5
Rg = 0 Ω, RLV = 1 kΩ0.45 2
EQfIN
= 1 kHz, VIN = −6 dBV 40 dB
−500 +900 mV
−25 +25 µA
RVfIN
= 1 kHz, VIN = 0 dBV 60 dB
(RC) Rg = 0 Ω−9 +9
DAC09 = (00) −2.5 −1.9 1.5 V
BL
DAC0A = (00) Data(45)
DAC09 = (FF), DAC0A = (FF) 4.2 4.7 5.2 V
BH
Data(46)−data(45) Data(46)
Without input 21 28 34 mA DC
Without input 0.7 1.5 2.3 mA DC
Without input −40 −36 −31 mA DC
Data(34W)
Data(34N)
Data(36H)
Data(36L)
mV[rms]
mV[p-0]
DC voltage
DC voltage
5