Page 1
BA3571F
Audio ICs
Headphone driver for
portable CD players
BA3571F
The BA3571F is headphone drivers designed for portable CD players. An oscillation damper is not needed at the
headphone output, minimizing external components. Includes a bass boost circuit which enables setting of the bass
boost with external components.
Applications
!
Portable CD players
Features
!
1) An external oscillation damper is not needed.
2) Includes a bass boost circuit making it possible to set
the bass boost with attached components.
Absolute maximum ratings
!!!!
Parameter Symbol Limits Unit
Power supply voltage V
Power dissipation
Operating temperature Topr ˚C
Storage temperature Tstg ˚C
1 Reduced by 5.5mW for each increase in Ta of 1˚C over 25˚C.
*
Recommended operating conditions
!!!!
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage 2.0 - 5.5 VV
(Ta = 25°C)
V
CC
Pd mW
(Ta = 25°C)
CC
5.5
1
*
550
-25~+75
-55~+125
Page 2
Audio ICs
Block diagram
!!!!
BA3571F
Vcc 1
Out 1
Vcc 2
Ripple Filter
IN 1
Bias in
Bias out
39k
Pre
GND
GND
BB SW
Power GND
10987
Out 2
τ
BB SW τ
6
BB SW
5
LP Out
4
LP NF
3
IN 2
2
LP IN
1
Pre GND
CC
V
13 12 11
NC
NC
15 14
16
RF1
NC
17
18
CC
19
20
V
50k
Page 3
Audio ICs
Electrical characteristics
!!!!
_ (unless otherwise noted, Ta = 25°C, V
Parameter Symbol Min. Typ. Max. Unit Conditions
Quiescent current
Voltage gain 1
Voltage gain 2
Rated output power
Total harmonic distortion
Channel balance
Output noise voltage 1
Output noise voltage 2
Input resistance
Ripple rejection
Boost
Channel separation
* Not designed for radiation resistance.
Measurement circuit
!!!!
1µ
~
I
Q
G
V1
G
V2
P
OUT
THD - 0.15 1.0 % VO = -16dBm
CB -1.5 0 1.5 dB VO = -16dBm
V
NO1
V
NO2
R
IN
RR 23 36 - dB fRR = 100Hz, VRR = -30dBm, BB = OFF
BB 4 6 8 dB f = 100Hz, VIN = -36dBm
CS 52 62 - dB
10k
33µ
1
2
13k
+
19
V
CC
+
20
CC
= 3V, RL = 16Ω, and f = 1kHz; measurement circuit shown in Fig.1)
- 9 18 mA
13.5 15 16.5 dB
11.5 13 14.5 dB
IN
= 0Vrms
V
BB = OFF
BB = ON
20 30 - mW THD = 10%
- -92 -88 dBm
- -88 -84 dBm
BB = OFF, IHF - A
BB = ON, IHF - A
10.8 13.5 16.2 kΩ
f = 1kHz, BB = OFF
2
1
SW1
THD
A
1
47
SW2
2
16
V
~
SW5
SW3
2
1
18
33µ
+
16
RF1
15
14
17
220µ
+
12
13
11
V
CC
BA3571F
CC
V
+
THD
16
220µ
V
~
~
2
1
GND
: Ω (±1%)
: F (±1%)
: F (±5%)
50k
13k
100k
0.1µ
1
2
3
SW6
1
SW3
39k
BB SW
8
4
5
+
2
2.2µ
5.1k
0.1µ
SW4
7
6
+
0.22µ
2
1
GND
10
9
+
220µ
Units
Resistors
Capacitors
Capacitors (electrolytic)
Pre
GND
2
1
100k
+
~
1µ
10k
Fig. 1
Page 4
Audio ICs
Application example
!!!!
LINE OUT
BA3571F
+
4.7k
10k
V
33µ
+
19
V
CC
17
18
33µ
++
16
15
RF1
50k
13
14
220µ
12
11
V
CC
CC
1µ
20
LINE OUT
Pre
GND
1
100k
0.1µ
1µ
2
100k
4.7k
+
10k
39k
3
4
5
6
0.1µ
5.1k
+
2.2µ
Fig. 2
Electrical characteristic curve
!!!!
30
20
BB OFF
10
0
VOLTAGE GAIN : GV (dB)
-10
100 1k
FREQUENCY : f (Hz)
Fig. 3 Voltage gain vs. frequency
BB ON
10k
BB SW
8
7
+
0.22µ
External dimensions
!!!!
BA3571F
7.8±0.3
1.8±0.1
9
5.4±0.2
0.11
GND
10
+
220µ
Units
Resistors
Capacitors
Capacitors (electrolytic)
(Units: mm)
12.5±0.2
20 11
1
0.4±0.11.27
GND
: Ω (±5%)
: F (±10%)
: F (±20%)
10
0.3Min.
0.15±0.1
0.15
SOP20
Loading...