TS4975_05 Datasheet, PDF (1/36 Pages) STMicroelectronics – Stereo Headphone Drive Amplifier with Digital Volume Control via I2C Bus

TS4975
Stereo Headphone Drive Amplifier with
Digital Volume Control via I²C Bus
■ Operating from V_CC = 2.5V to 5.5V
■ I²C bus control interface
■ 40mW output power @ V_CC = 3.3V,
THD = 1%, F = 1kHz, with 16Ω load
■ Ultra-low consumption in stdby mode: 0.6µA
■ Digital volume control range from 18dB to
-34dB
■ 14-step digital volume control
■ 9 different output mode selections
■ Pop & click noise reduction circuitry
■ Flip-chip package, 12 x 300µm bumps (lead-
free)
Description
The TS4975 is a stereo audio headphone driver
capable of delivering up to 102mW per channel of
continuous average power into a 16Ω single-
ended load with 1% THD+N from a 5V power
supply. The overall gain of these headphone
drivers is controlled digitally by volume control
registers programmed via the I²C interface,
minimizing the number of external components
needed. This device can also easily be driven by
an MCU to select the output modes, through the
I²C bus interface.
A phantom ground configuration allows one to
avoid using bulky capacitors on the outputs of the
headphone amplifiers.
The TS4975 is packaged in a 1.8mm X 2.3mm
Flip Chip package, ideally suited for space-
conscious portable applications.
It has also an internal thermal shutdown
protection mechanism.
Order Codes
Part Number
TS4975EIJT
Temperature Range
-40, +85°C
TS4975EIJT - Flip Chip
Pin out (top view)
OUT1
PHG1
PHG2
OUT2
IN1
VCC
GND
IN2
BYPASS
SCL
SDA
ADD
Applications
■ Mobile phones (cellular / cordless)
■ PDAs
■ Laptop/notebook computers
■ Portable audio devices
Package
Flip-chip
Packing
Tape & Reel
Marking
A75
November 2005
Rev 3
1/36
www.st.com
36