TDA8947J データシートの表示（PDF） - Philips Electronics

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TDA8947J

4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W)

Philips Electronics 

Philips Semiconductors

TDA8947J

4-channel audio amplifier

Mute — The amplifier is DC-biased, but not operational (no audio output). This allows

the input coupling capacitors to be charged to avoid pop-noise. The device is in the

mute mode when 4.5 V < VMODE1 < (VCC − 3.5 V).

On — The amplifier is operating normally. The on mode is activated at

VMODE1 > (VCC − 2.0 V). The output of channels 3 and 4 can be set to mute or on

mode.

The output channels 3 and 4 can be switched on/off by applying a proper DC voltage

to pin MODE2, under the condition that the output channels 1 and 2 are in the on

mode (see Figure 3).

Table 5: Mode selection

Voltage on pin

MODE1

MODE2

0 to 0.8 V

4.5 to (VCC − 3.5 V)

(VCC − 2.0 V) to VCC

0 to VCC

0 to VCC

0 to (VCC − 3.5 V)

(VCC − 2 V) to VCC

Channel 1 and 2

standby

mute

on

on

Channel 3 and 4

(sub woofer)

standby

mute

mute

on

all standby

all mute

channels 1+2: on

channels 3+4: on or mute

0.8

4.5

VCC−3.5 VCC−2.0 VCC

VMODE1

channels 3+4: mute

channels 3+4: on

MDB016

Fig 3. Mode selection.

VCC−3.5 VCC−2.0 VCC

VMODE2

8.4 Supply voltage ripple rejection

The Supply Voltage Ripple Rejection (SVRR) is measured with an electrolytic

capacitor of 150 µF on pin SVR using a bandwidth of 20 Hz to 22 kHz. Figure 11

illustrates the SVRR as function of the frequency. A larger capacitor value on pin SVR

improves the ripple rejection behavior at the lower frequencies.

9397 750 10779

Preliminary data

Rev. 01 — 06 February 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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