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TS4974 Datasheet(PDF) 3 Page - STMicroelectronics

No. de pieza TS4974
Descripción Electrónicos  1W Differential Audio Power Amplifier with Up/Down Digital Volume Control Pins
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4974 Datasheet(HTML) 3 Page - STMicroelectronics

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Application Information
TS4974
3/8
1
Application Information
Operation Mode
The TS4974 is a fully differential power amplifier which enables better performances in terms of noise
immunity and PSRR.
The TS4974 features a digital volume control with an internal gain range from -33dB up to +12dB, by
steps of 3dB. When the device is firstly biased, an initial gain of -12dB is internally fixed. When standby
mode is activated, the gain value is memorized and held until standby is released.
The volume is controlled by means of two pins UP and DOWN on which the application of a VIL voltage
will activate the increase or decrease in gain. The TS4974 integrates a debouncing system which does
not allow to take into account UP or DOWN pulse shorter than Tdebounce time. Moreover an autorepeat
function is implemented. When a continuous voltage is applied on UP or DOWN pin, the gain is
continuously increased or decreased after a certain time called Tautorepeat. The first period of each
autorepeat sequence is longer ( x1.5Tauto ) to avoid any parasitic activation. In this operational mode,
Trange time is necessary to cover the whole gain range of the device.
Figure 1: Typical application schematics
BIAS
DIGITAL VOLUME
CONTROL
GND
VCC
UP
DOWN
8
TS4974
Cb
1µF
+
330nF
+
+
330nF
OUT1
STBY
STDBY
BYPASS
OUT2
DIFFERENTIAL
INPUT STAGE
Vin+
Vin-
Cs
+
1µF
BIAS
DIGITAL VOLUME
CONTROL
DIGITAL VOLUME
CONTROL
GND
VCC
UP
DOWN
8
TS4974
Cb
1µF
+
330nF
+
+
330nF
OUT1
STBY
STDBY
BYPASS
OUT2
DIFFERENTIAL
INPUT STAGE
Vin+
Vin-
Cs
+
1µF
Cs
+
1µF


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