www.ti.com

FUNCTION CONTROL

MUTE

POLARITY CONTROL

MODE CONTROL REGISTER RESET

PCM1807

SLES147 – SEPTEMBER 2005

The PCM1807 has the following functions which can be controlled through the serial control port. When the

LRCK (fS), SCKI, MD[1:0], or FMT bit is changed on the fly, a clock-halt reset or an immediate reset by PDWN or

SRST via the serial control port is recommended to obtain stable analog performance.

The MUTE bit controls fade-in and fade-out operation for DOUT. When the MUTE bit is set from 0 to 1, the

fade-out operation provides step-down digital attenuation to prevent a pop noise. When the MUTE bit is set from

1 to 0, the fade-in operation provides a step-up digital gain to prevent a pop noise. The digital output of DOUT

behaves as shown in Figure 18.

Table 4. Mute On/Off Control

MUTE

MUTE CONTROL

0

Normal operation (default)

1

Mute on

By setting PREV = 1, the PCM1807 inverts the data on DOUT relative to that of the analog signal on VINL/VINR

(pin 13/pin 14). Because the inversion occurs immediately after the PREV bit changes, pop noise can be

generated at the change. It is recommended that MUTE or PDWN be asserted before using PREV.

Table 5. Polarity Control

PREV

POLARITY CONTROL

0

Normal operation (default)

1

Invert

The MRST bit is used to reset the mode control register to the default setting.

Table 6. Mode Control Register Reset

MRST

MODE CONTROL REGISTER RESET

0

Set default value

1

Normal operation (default)

19