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PDF TS4975 Data sheet ( Hoja de datos )
| Número de pieza | TS4975 | |
| Descripción | Stereo Headphone Drive Amplifier | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TS4975 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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TS4975
Stereo Headphone Drive Amplifier with
Digital Volume Control via I2C Bus
■ Operating from VCC = 2.5V to 5.5V
■ I²C bus control interface
■ 40mW output power @ VCC = 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
www.DataSheet4U.com
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
1 page  
TS4975
3 Electrical Characteristics
Electrical Characteristics
Table 3. Electrical characteristics for the I²C interface
Symbol
Parameter
Value
Unit
VIL Maximum Low level Input Voltage on pins SDA, SCL, VADD
0.3 VCC
V
VIH Minimum High Level Input Voltage on pins SDA, SCL, VADD
0.7 VCC
V
FSCL
SCL Maximum clock Frequency
400 kHz
Vol Max Low Level Output Voltage, SDA pin, Isink = 3mA
0.4 V
Ii
Max Input current on SDA, SCL(1)
from 0.1 VCC to 0.9 VCC
10 µA
1. SCL and SDA are CMOS inputs. The nominal input current is about few pA and not 10uA. 10µA refer to the I2C
bus specification.
Table 4. Output noise (all inputs grounded)
Unweighted Filter
from VCC = 2.5V to 5V
SE, G = +2dB
34µVrms
SE, G = +18dB
67µVrms
PHG, G = +2dB
34µVrms
PHG, G = +18dB
67µVrms
Weighted Filter (A)
from VCC = 2.5V to 5V
23µVrms
45µVrms
23µVrms
45µVrms
5/36
5 Page 
TS4975
Electrical Characteristics
Table 7. VCC = +5V, GND = 0V, Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Conditions
Min. Typ. Max.
RL = 32Ω, AV = 2dB with Single-ended
F = 1kHZ, Pout = 50mW
103
Crosstalk Channel Separation
RL = 32Ω, AV = 2dB with Single-ended
F = 20Hz to 20kHz, Pout = 50mW
RL = 32Ω, AV = 2dB with Phantom Ground,
F = 1kHZ, Pout = 50mW
75
69
RL = 32Ω, AV = 2dB with Phantom Ground,
F = 20Hz to 20kHz, Pout = 50mW
69
SNR
Signal To Noise
Ratio, A-Weighted
AV = 2dB, RL = 32Ω, Pout = 62mW
Single-Ended
AV = 2dB, RL = 32Ω, Pout = 62mW
Phantom Ground
95
95
Output Noise
ONoise Voltage,
A-Weighted
AV = 2dB, Single-ended
AV = 2dB, Phantom Ground
23
23
G Digital Gain Range In1 & In2 to Out1 & Out2
-34 +18
Digital Gain Step size
4
Gain Error Tolerance
Zin
In1 & In2 Input
Impedance
All gain settings
twu Wake up time
Cb=1µF
tws Standby time
-1 +1
25.5 30 34.5
80 144
1
1. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to VCC @ F = 217Hz
Unit
dB
dB
µVrms
dB
dB
dB
kΩ
ms
µs
11/36
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TS4975.PDF ] | |
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