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TDA8948J/N1112

4-channel audio amplifier

NXP Semiconductors. 

NXP Semiconductors

TDA8948J

4-channel audio amplifier

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 V to 0.8 V

4.5 V to (VCC − 3.5 V)

(VCC − 2.0 V) to VCC

0 V to VCC

0 V to VCC

0 V to (VCC − 3.5 V)

(VCC − 2 V) to VCC

Channel 1 and 2

Standby mode

Mute mode

On mode

On mode

Channel 3 and 4

(sub woofer)

Standby mode

Mute mode

Mute mode

On mode

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 10 illustrates the SVRR

as function of the frequency. A larger capacitor value on pin SVR improves the ripple

rejection behavior at the lower frequencies.

TDA8948J_1

Product data sheet

Rev. 01 — 27 February 2008

© NXP B.V. 2008. All rights reserved.

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