TS4997 datasheet(27/34 Pages) STMICROELECTRONICS

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TS4997

Application information

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4.11

Shutdown time

When the standby command is activated (both channels put into standby mode), the time

required to put the two output stages of each channel in high impedance and the internal

circuitry in shutdown mode is a few microseconds.

Note:

In shutdown mode when both channels are in standby, the Bypass pin and LIN+, LIN-, RIN+,

RIN- pins are shorted to ground by internal switches. This allows a quick discharge of Cb and

CIN capacitors.

4.12

Pop performance

Due to its fully differential structure, the pop performance of the TS4997 is close to perfect.

However, due to mismatching between internal resistors Rfeed, external resistors RIN and

external input capacitors CIN, some noise might remain at startup. To eliminate the effect of

mismatched components, the TS4997 includes pop reduction circuitry. With this circuitry,

the TS4997 is close to zero pop for all possible common applications.

In addition, when the TS4997 is in standby mode, due to the high impedance output stage in

this configuration, no pop is heard.

4.13

Single-ended input configuration

It is possible to use the TS4997 in a single-ended input configuration. However, input

coupling capacitors are needed in this configuration. The schematic diagram in Figure 67

shows an example of this configuration for a gain of +6dB set by the input resistors.

TS4997 bảng dữ liệu(PDF) 27 Page - STMicroelectronics