www.ti.com

TERMINAL FUNCTIONS (CONTINUED)

PCM1770, PCM1771

SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007

PCM1770RGA

TERMINAL

I/O

DESCRIPTION

NAME

NO.

AGND

4

–

AIN

10

I

Monaural analog signal mixer input. The signal can be mixed with the outputs of the L- and R-channel DACs.

BCK

2

I/O

Serial bit clock. Clocks the individual bits of the audio data input, DATA. In the slave interface mode, this clock

is input from an external device. In the master interface mode, the PCM1770 device generates the BCK output

to an external device.

DATA

1

I

Serial audio data input

HGND

5

–

9

O

L-channel analog signal output of the headphone amplifiers

7

O

R-channel analog signal output of the headphone amplifiers

LRCK

20

I/O

Left and right clock. Determines which channel is being input on the audio data input, DATA. The frequency of

LRCK must be the same as the audio sampling rate. In the slave interface mode, this clock is input from an

external device. In the master interface mode, the PCM1770 device generates the LRCK output to an external

device.

MC

14

I

Mode control port serial bit clock input. Clocks the individual bits of the control data input, MD.

MD

13

I

Mode control port serial data input. Controls the operation mode on the PCM1770 device.

MS

15

I

Mode control port select. The control port is active when this terminal is low.

NC

8, 17,

–

No connect

18, 19

PD

3

I

Reset input. When low, the PCM1770 device is powered down, and all mode control registers are reset to

default settings.

SCKI

16

I

System clock input

12

–

Power supply for all analog circuits except the headphone amplifier.

6

–

Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is

11

–

7

Submit Documentation Feedback