Charge Pump Flying Capacitor and PVSS Capacitor

Decoupling Capacitors

Gain setting resistors ranges

-In

+

-

Inverting

+

-

Differential

Input

-In

+In

+In

Rx

+

-

Cx

Non

Inverting

DRV602

The charge pump flying capacitor serves to transfer charge during the generation of the negative supply voltage.

The PVSS capacitor must be at least equal to the charge pump capacitor in order to allow maximum charge

transfer. Low ESR capacitors are an ideal selection, and a value of 1µF is typical. Capacitor values that are

smaller than 1µF can be used, but the maximum output voltage may be reduced and the device may not operate

to specifications.

The DRV602 is a DirectPath Line Driver amplifier that require adequate power supply decoupling to ensure that

the noise and total harmonic distortion (THD) are low. A good low equivalent-series-resistance (ESR) ceramic

capacitor close to the DRV602 is important for the performance of the amplifier. For filtering lower frequency

noise signals, a 10-µF or greater capacitor placed near the audio power amplifier would also help, but it is not

required in most applications because of the high PSRR of this device.

high increases the noise of the amplifier. Table 1 lists the recommended resistor values for different gain

settings.

Table 1. Recommended Resistor Values

INPUT RESISTOR

FEEDBACK RESISTOR

DIFFERENTIAL INPUT

INVERTING INPUT GAIN

NON INVERTING INPUT

GAIN

GAIN

22 k

Ω

22 k

Ω

1.0 V/V

–1.0 V/V

2.0 V/V

15 k

Ω

30 k

Ω

1.5 V/V

–1.5 V/V

2.5 V/V

33 k

Ω

68 k

Ω

2.1 V/V

–2.1 V/V

3.1 V/V

10 k

Ω

100 k

Ω

10.0 V/V

–10.0 V/V

11.0 V/V

Figure 6. Differential Input

Figure 7. Inverting

Figure 8. Non-Inverting

Copyright © 2008, Texas Instruments Incorporated

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Product Folder Link(s): DRV602