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PDF TS4974 Data sheet ( Hoja de datos )
| Número de pieza | TS4974 | |
| Descripción | 1W Differential Audio Power Amplifier | |
| Fabricantes | STMicroelectronics | |
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TS4974
1W Differential Audio Power Amplifier
with Up/Down Digital Volume Control Pins
s Operating from VCC = 2.5V to 5.5V
s Zero pop&clickless circuit
s 1.W output power @ Vcc=5V, THD=1%,
F=1kHz, with 8Ω Load
s Ultra low consumption in standby mode
(2µA max.)
s 85dB PSRR @ 217Hz
s 16 digital volume control steps
s Two up and down volume control discrete
pins
s Gain range from -33dB to + 12dB
s Integrated debouncing system
s Ultra fast start up time: 15ms typ.
s DFN10 3X3 mm pitch 0.5
PRODUCT PREVIEW
Pin Connections (top view)
TS4974IQ DFN Package
Description
At 3.3v, the TS4974 is a dual power audio
amplifierwww.DataSheet4U.com capable of delivering 380mW of
continuous RMS ouput power into a 8Ω bridged-
tied loads with 1% THD+N. An external standby
mode control reduces the supply current to less
than 2µA. An internal over-temperature shutdown
protection is provided.
The TS4974 has been designed for high quality
audio applications such as mobile phones and for
minimizing the number of external components.
The TS4974 features a 16 step digital volume
control through two discrete control Up and Down
pins. The start-up gain is internally fixed to -12dB.
An integrated debounce system prevents voltage
pikes on UP/DOWN pins during volume control
mode to be taken into account during a debounce
time of 10ms (typ.).
TS4974IQ - Pinout
VIN-
VIN+
BYPASS
STANDBY
GND
1
2
3
4
5
10 VCC
9 VOUT-
8 VOUT+
7 UP / DVC
6 DOWN / DVC
Applications
s Mobile phones (cellular / cordless)
s PDAs
Order Codes
Part Number
TS4974IQT
Temperature Range
-40, +85°C
s Laptop/notebook computers
s Portable audio devices
Package
QFN
Packaging
Tape & Reel
Marking
TBA
November 2004
Revision 1
This is preliminary information on a new product now in development. Details are subject to change without notice.
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1 page  
Electrical Characteristics
TS4974
Table 4: VCC = +3.3V, GND = 0V, Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Min. Typ. Max.
ICC
Supply Current
No input signal, no load
ISTANDBY
Standby Current
No input signal, Vstdby = Gnd, RL = 8Ω
Voo
Output Offset Voltage
No input signal, RL = 8Ω, Floating inputs
Po
Output Power
THD = 1% Max, f = 1kHz, RL = 8Ω
Total Harmonic Distortion + Noise
THD + N Po = 250mW rms,
20Hz < F < 20kHz, RL = 8Ω, 0dB gain, Cb=1µF, Cin=330nF
PSRR
Power Supply Rejection Ratio1
F = 217Hz, RL = 8Ω, )
Vripple = 200mVpp, Input Grounded, Cb=1µF, Cin=330nF
CMRR
Common Mode Rejection Ratio2
F = 217Hz, RL = 8Ω,
Vincm = 200mVpp, Cb = 1µF, Cin=330nF
SNR
Signal-to-Noise Ratio ( Weighted A, 6dB gain )
( RL = 8Ω, THD + N ≤ 0.5%, 20Hz < F < 20kHz)
Gs Start up Gain
G Digital Gain Range
Gain Step
size
Gain accu-
racy
Twu Wake-up Time
Output Voltage Noise F = 20Hz to 20kHz, RL = 8Ω
VN Unweighted
Weighted A
Zin Differential input impedance
Tdebounce Debouncing time
Tautorepeat time between volume change
Trange
During autorepeat mode, necessary time to cover the whole gain
range
3.0
230 2000
5 20
300 380
0.5
75 85
45 61
100
-12
-33 +12
3
-1 +1
15
21
17
48 60 75
10
160
2500
1) Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ F = 217Hz.
2) Dynamic measurements - 20*log(rms(Vout)/rms(Vincm)).
Unit
mA
nA
mV
mW
%
dB
dB
dB
dB
dB
dB
dB
ms
µVRMS
kΩ
ms
ms
ms
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TS4974.PDF ] | |
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