PCM1770

PCM1771

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

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5

Terminal Functions

PCM1770PW

TERMINAL

I/O

DESCRIPTIONS

NAME

NO.

I/O

DESCRIPTIONS

AGND

5

–

Analog ground. This is a return for VCC.

AIN

10

I

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

BCK

3

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

DATA

2

I

Serial audio data input

HGND

6

–

Analog ground. This is a return for VHP.

HOUTL

9

O

L-channel analog signal output of the headphone amplifiers

HOUTR

8

O

R-channel analog signal output of the headphone amplifiers

LRCK

1

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.

PD

4

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

VCC

12

–

Power supply for all analog circuits except the headphone amplifier.

VCOM

7

–

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 0.5VHP nominal.

VHP

11

–

Analog power supply for the headphone amplifier circuits. The voltage level must be the same as VCC.

PCM1770RGA

TERMINAL

I/O

DESCRIPTIONS

NAME

NO.

I/O

DESCRIPTIONS

AGND

4

–

Analog ground. This is a return for VCC.

AIN

10

I

Monaural analog signal mixer input. The signal can be mixed with output of 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 external device. In the master interface mode, the PCM1770 device generates the BCK output to external

device.

DATA

1

I

Serial audio data input

HGND

5

–

Analog ground. This is a return for VHP.

HOUTL

9

O

L-channel analog signal output of the headphone amplifiers

HOUTR

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,

18, 19

–

No connect

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

VCC

12

–

Power supply for all analog circuits except the headphone amplifier.

VCOM

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 0.5VHP nominal.

VHP

11

–

Analog power supply for the headphone amplifier circuits. The voltage level must be the same as VCC.