PCM2912 datasheet(8/32 Pages) TI

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PCM2912

SLES216 – FEBRUARY 2008

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTIONS

NAME

PJT

BGND

–

Reference for internal regulator.

VBUS

–

Connect to USB power (VBUS)

D–

I/O

USB differential input/output minus(1)

D+

I/O

USB differential input/output plus(1)

VDD

–

Digital power supply(2)

DGND

Digital ground

XTO

Crystal oscillator output

XTI

Crystal oscillator input (3)

–

External filter pin of L-channel (optional)

–

External filter pin of R-channel (optional)

VCOM1

–

Common voltage for ADC, DAC and analog front end (VCCA/2). Decouple capacitor should be connected to

AGND.

VCOM2

–

Common voltage for headphone (VCCA/2). Decouple capacitor should be connected to AGND.

AGND

–

Analog ground

–

Not connected

VCCA

–

Analog power supply

VIN

ADC microphone input

MBIAS

Microphone bias output (0.75 VCCA)

VOUTL

Headphone output for L-channel

VCCL

–

Analog power supply for headphone amplifier of L-channel(2)

HGND

–

Analog ground for headphone amplifier

VCCR

–

Analog power supply for headphone amplifier of R-channel(2)

VOUTR

Headphone output for R-channel

MAMP

Microphone preamplifier gain control (LOW: Preamplifier off, HIGH: Preamplifier on = +20 dB)(3)

POWER

Power consumption declaration select pin (LOW: 100 mA, HIGH: 500 mA) (3)

PGND

–

Analog ground for microphone bias, microphone amplifier, and PGA

VCCP

–

Analog power supply for PLL(2)

TEST1

Test pin. Must be set to HIGH(3)

TEST0

Test pin. Must be set to LOW (3)

SSPND

Suspend flag (LOW: Suspend, HIGH: Operational state)

MMUTE

Microphone mute control, active HIGH (LOW: Mute off, HIGH: Mute on)(4)

REC

Status output for record (LOW: Record, FLASH: Mute on recode, HIGH: Stop)(5)

PLAY

Status output for playback (LOW: Playback, FLASH: Mute on playback, HIGH: Stop)(5)

(1)

LV-TTL level

(2)

Connect decouple capacitor to corresponding ground.

(3)

3.3-V CMOS level input.

(4)

3.3-V CMOS level input with internal pulldown.

(5)

5 V tolerant, open-drain.

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