Datasheet

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TERMINAL FUNCTIONS (CONTINUED)
PCM1770 , PCM1771
SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007
PCM1770RGA
TERMINAL
I/O DESCRIPTION
NAME NO.
AGND 4 – Analog ground. This is a return for V
CC
.
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 – Analog ground. This is a return for V
HP
.
H
OUT
L 9 O L-channel analog signal output of the headphone amplifiers
H
OUT
R 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
V
CC
12 – Power supply for all analog circuits except the headphone amplifier.
V
COM
6 – Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is
required for noise filtering. Voltage level of this terminal is 0.5 V
HP
nominal.
V
HP
11 – Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V
CC
.
7
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