Preliminary
RT9131
Class AB Stereo Headphone Drive with Mute
General Description
The RT9131 is an integrated class AB stereo
headphone driver contained in a SOP-8 or DIP-8
plastic package with Mute feature. A class AB output
stage bias control circuit is employed to maintain low
audio signal distortion and power consumption. The
RT9131 further integrates a voltage divider inside
the chip. Thus, the external resistors can be
eliminated. The device is fabricated in a CMOS
process and has been primarily developed for
portable digital audio applications.
Features
High Signal-to-Noise Ratio
High Slew Rate
Low Distortion
Large Output Voltage Swing
Flexible Mute Function
Excellent Power Supply Ripple Rejection
Low Power Consumption
Short-circuit Elimination
Wide Temperature Range
No Switch ON/OFF Clicks
Integrated Voltage Divider (V
DD
/2) to Eliminate
External Resistors
Ordering Information
RT9131
PackageType
N : DIP-8
S : SOP-8
Operating Tmperature Rnge
C: Commercial Standard
Applications
Portable Digital Audio
Pin Configurations
Part Number
RT9131CN
(Plastic DIP-8)
Pin Configurations
TOP VIEW
OUTA 1
MUTE 2
8 VDD
7 OUTB
6 BIAS
5 INB
Marking Information
Part Number
RT9131CN
RT9131CS
Marking
RT9131CN
RT9131CS
RT9131CS
(Plastic SOP-8)
INA 3
GND 4
Typical Application Circuit
C7
220碌F
+
R1
V
MUTE
H: Speaker Action
L: Mute On
V
INA
100K
C2
2.2碌F
C4
1碌F
1
OUTA
VDD
8
C6
+
220碌F
2 MUTE OUTB 7
RT9131
6
3 INA
BIAS
4 GND
INB 5
+C5
4.7碌F
V
INB
C3
2.2碌F
+C1
100碌F
V
DD
DS9131-01 November 2002
www.richtek.com.tw
1