Panasonic AN7500FHQ Datasheet
ICs for Radio-Cassette, Cassette Deck
AN7500FHQ
Audio signal processing IC for 1.5 V headphone stereo
■ Overview
The AN7500FHQ is a single chip IC optimum for a
1.5 V headphone stereo system including pre-amp., power
amp. and Dolby B type noise reduction circuit. Current
consumption in a Dolby circuit off mode has been drastically reduced and an operating supply voltage has also
been lowered to 0.98 V. Much fewer external components
have been realized due to an integration of audio signal
processing system into a single chip circuitry in a small
outline package and space saving mounting of a set.
■ Features
• Reduction by power consumption of approximately 35%
as compared with conventional products, contributing
to low power consumption of a set.
• Eliminating the DC/DC converter so far needed for con-
ventional system due to 1.5 V single power supply, and
reducing approx. 40% of external components. This
contributes to space saving in a set.
• Built-in standby switch to reduce consumption current
considerably.
■ Applications
• Headphone stereo
36 25
37
1
(0.75)
9.00±0.40
7.00±0.20
12
0.50
0.20
Seating plane
LQFP048-P-0707
+0.10
–0.05
24
1348
(0.75)
7.00±0.20
1.40±0.10
(0.625)(0.625)
0.10±0.10
Unit: mm
9.00±0.40
–0.05
+0.10
1.70 max.
0.15
(1.00)
0° to 10°
0.50±0.20
1
AN7500FHQ ICs for Radio-Cassette, Cassette Deck
■ Block Diagram
REF
N.R. in (L)
36
35
I
34
N.R. out (L)
33
32
31
30
SB out (L)
29
28
PWR in (L)
27
26
PWR in (R)
25
PB out (L)
REV in (L)
FWD in (L)
V
REF
FWD in (R)
REV in (R)
PB out (R)
37
38
39
40
25 kΩ 200 kΩ
41
42
43
Bias
44
45
25 kΩ
46
200 kΩ
47
48
N.R.
FWD
REV
On Off
mute
1
160 Ω
24
86 kΩ
100 kΩ
V
REF
V
REF
23
22
21
PWR out (R)
20
V
CC
19
GND
18
PWR out (L)
17
AGC
16
Ripple
filter
V
V
REF
REF
15
14
100 kΩ
86 kΩ
Control
13
STBY
160 Ω
2
3
4
5
6
7
8
9
10
11
12
ASC
N.R. in (R)
N.R. out (R)
SB out (R)
Low BST
Power mute
2
ICs for Radio-Cassette, Cassette Deck AN7500FHQ
■ Pin Descriptions
Pin No. Description
1 FWD/REV/pre-mute control
2 Noise reduction on/off control
3 N.R. decoder input (R)
4 N.R. decoder output (R)
5 Side-chain filter (R)
6 Weighting amp. filter (R)
7 Control voltage ripple filter (R)
8 Sub-buffer amp. output (R)
9 Sub-buffer amp. input (R)
10 Sub-buffer amp. on/off control
11 Low boost on/off control
12 Power mute on/off control
13 Standby on/off control
14 Ripple filter input
15 Ripple filter base pin
16 Ripple filter output
17 AGC time constant
18 Power output (L)
19 GND pin
20 Positive power supply
21 Power output (R)
22 Low boost capacitor pin 2
23 LPF2 capacitor pin
24 Low boost capacitor pin 1
Pin No. Description
25 Power input (R)
26 LPF1 capacitor pin
27 Power input (L)
28 Sub-buffer amp. input (L)
29 Sub-buffer amp. output (L)
30 Control voltage ripple filter (L)
31 Weighting amp. filter (L)
32 Side-chain filter (L)
33 N.R. decoder output (L)
34 N.R. decoder input (L)
35 Reference current resistance pin
36 MS LPF C pin
37 MS output
38 MS filter pin
39 Playback amp. output (L)
40 Playback amp. negative feedback input (L)
41 Playback amp. REV input (L)
42 Playback amp. FWD input (L)
43 Reference voltage output
44 Playback amp. FWD input (R)
45 Playback amp. REV input (R)
46 Playback amp. negative feedback input (R)
47 Playback amp. output (R)
48 Reference voltage input
■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage V
Supply current I
2
Power dissipation
Operating ambient temperature
Storage temperature
Note)*1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
2: Ta = 75°C
*
*
1
*
1
*
CC
CC
P
D
T
opr
T
stg
2.1 V
20 mA
249 mW
−20 to +70 °C
−55 to +125 °C
3
AN7500FHQ ICs for Radio-Cassette, Cassette Deck
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage V
Note)*: Supply voltage of VCC of 0.95 V to 0.98 V is permissible as long as it does not cause any abnormal operation such as oscillation.
CC
■ Electrical Characteristics at VCC = 1.2 V, f = 1 kHz, RL = 32, Ta = 25°C
Parameter Symbol Conditions Min Typ Max Unit
Voltage gain G
Circuit current 1 I
Circuit current 2 I
Circuit current 3 I
Circuit current 4 I
Circuit current 5 I
Pre-amp. block
Open-loop voltage gain G
Close-loop voltage gain G
Max. output voltage
V
omax(PB)
Total harmonic distortion THD
Output noise voltage V
Channel separation CS
FWD/REV crosstalk CT
Ripple rejection factor RR
Mute attenuation amount
G
MUTE(PB)
Heavy low sound + power amp. block
Gain voltage 1 G
Gain voltage 2 G
Low frequency boost amount G
Rated output power P
Total harmonic distortion THD
Channel separation 1 CS1
VO = −22.2 dBV 54 57 60 dB
V
VIN = 0, Rg = 2.2 kΩ, 3.2 5.9 mA
CC1
L. BST off, N.R. off
VIN = 0, Rg = 2.2 kΩ, 4.4 7.1 mA
CC2
L. BST off, N.R. on
CC3Pout
CC4Pout
= 0.5 mW × 2-ch., RL = 32 Ω7.0 11.2 mA
= 0.5 mW × 2-ch., 8.4 12.8 mA
RL = 32 Ω, N.R. on
STBY on 15 30 µA
CC5
VO(PB)VO
VC(PB)VO
= −22.2 dBV 61 73 dB
= −22.2 dBV 32.5 34 35.5 dB
THD = 1%, 30 kHz, LPF on 120 210 mV
= −22.2 dBV, 30 kHz, LPF on, 0.2 0.6 %
(PB)VO
GVC = 35 dB (NAB)
NO(PB)Rg
(PB)
= 2.2 kΩ, IHF-A −90 −76 dBV
Sincgle ch. input, 1 kHz, BPF on, 37 46 dB
Rg = 2.2 kΩ, VO = −22.2 dBV
Single ch. input, 1 kHz, BPF on, 51 59 dB
(PB)
Rg = 2.2 kΩ, VO = −22.2 dBV
(PB)Rg
= 2.2 kΩ, VRR = −32.2 dBV, 43 53 dB
f
= 100 Hz, I
RR
RFO
BPF: 100 Hz, 1/4 OCT
Ratio to VO = −22.2 dBV, −85 −70 dB
pre-mute on
V1(PW)VO
V2(PW)
V3(PW)
= −22.2 dBV 21 23 25 dB
L. boost on, VO = −22.2 dBV 21.4 23.4 25.4 dB
L. boost on/off, 15 19 23 dB
f = 50 Hz, VIN = 65.2 dBV
THD = 10%, 30 kHz, LPF on 2.5 4.5 mW
out
(PW)Pout
(PW)
= 1 mW, 30 kHz, LPF on 0.35 1.3 %
Sincgle ch. input, 1 kHz, BPF, 33 40 dB
Rg = 0, VO = −22.2 dBV
0.98 * to typ. 1.2 to 2.0 V
= 15 mA,
4
ICs for Radio-Cassette, Cassette Deck AN7500FHQ
■ Electrical Characteristics at VCC = 1.2 V, f = 1 kHz, RL = 32, Ta = 25°C (continued)
Parameter Symbol Conditions Min Typ Max Unit
Heavy low sound + power amp. block (continued)
Channel separation 2 CS2
Output noise voltage 1
Output noise voltage 2
V
NO1(PW)Rg
V
NO2(PW)
Ripple rejection factor 1 RR1
Ripple rejection factor 2 RR2
Input resistance R
Channel balance CB
Mute output voltage
V
MUTE(PW)VIN
AGC level V
Output DC step DV
Dolby block
1
Reference input level
*
V
Channel balance CB
2
N.R. decode characteristics 1
N.R. decode characteristics 2
N.R. decode characteristics 3
N.R. decode characteristics 4
N.R. decode characteristics 5
Note)*1: Adjust an input level to get an output level of −3.2 dBV at a measuring point (N.R. out) so that you can get 0 dB of reference
input level.
2: VO in the calculating equation is the output level based on reference of 0 dB = −32.2 dBV (measuring point: N.R. out).
*
*
G
2
*
G
2
*
G
2
*
G
2
*
G
Sincgle ch. input, Low boost on, 25 31 dB
(PW)
Rg = 0, VO = −22.2 dBV, 1 kHz, BPF
= 0, IHF-A −91 −86 dBV
Low boost on, Rg = 0, IHF-A −86 −82 dBV
= 0, VRR = −32.2 dBV, 60 72 dB
(PW)Rg
fRR = 100 Hz, I
= 15 mA,
RFO
BPF: 100 Hz, 1/4 OCT
Low boost on, Rg = 0, 40 61 dB
(PW)
V
= −32.2 dBV, fRR = 100 Hz,
RR
I
= 15 mA, BPF: 100 Hz, 1/4 OCT
RFO
IN(PW)
(PW)VO
= −22.2 dBV −1.5 0 1.5 dB
7.2 9.5 12 kΩ
= −32.2 dBV −96 −90 dBV
AGCVIN
= −45.2 dBV, f = 100 Hz, −17.3 −14.7 −13.1 dBV
R
= 32 Ω,
L
AGC level to be measured at 32 Ω end.
PWR mute (pin 12) on/off −30 0 30 mV
(PW)
N.R.: Off, BEF: Off, f = 1 kHz, −33.9 −32.8 −31.7 dBV
IN(NR)
VO = −32.2 dBV
(Calculation) channel ratio of the above −10 1 dB
(NR)
V
IN
N.R.: On, BEF: Off, f = 10 kHz, −20 2 dB
(NRD1)
V
= −29.6 dB,
IN
Calculation NRD = VO +40 (dB)
N.R.: On, BEF: Off, f = 1 kHz, −20 2 dB
(NRD2)
VIN = −23.9 dB,
Calculation NRD = VO +30 (dB)
N.R.: On, BEF: Off, f = 1 kHz, −3.0 0 3.0 dB
(NRD3)
V
= −15.8 dB
IN
Calculation NRD = VO +20 (dB)
N.R.: On, BEF: Off, f = 10 kHz, −2.5 0 2.5 dB
(NRD4)
V
= −17.4 dB
IN
Calculation NRD = VO +20 (dB)
N.R.: On, BEF: Off, f = 10 kHz, −20 2 dB
(NRD5)
VIN = 0.4 dB,
Calculation NRD = VO (dB)
5
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