WM8976CGEFLSLASHV datasheet(9/114 Pages) WOLFSON

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Production Data

WM8976

PD, Rev 4.5, November 2011

Test Conditions

DCVDD=1.8V, AVDD=DBVDD=SPKVDD= 3.3V, TA = +25

oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OUT3/OUT4 outputs (with 10k

 / 50pF load)

Full-scale output voltage, 0dB

gain (Note 9)

OUT3BOOST=0/

OUT4BOOST=0

SPKVDD/3.3

Vrms

OUT3BOOST=1

OUT4BOOST=1

(SPKVDD/3.3)*1.5

Vrms

Signal to Noise Ratio (Note 6)

SNR

A-weighted

Total Harmonic Distortion

(Note 7)

THD

RL = 10 k

full-scale signal

-84

Channel Separation (Note 8)

1kHz signal

100

Power Supply Rejection Ratio

(50Hz-22kHz)

PSRR

RL = 10k

RL = 10k SPKVDD=5V

(boost)

Microphone Bias

Bias Voltage

VMICBIAS

MBVSEL=0

0.9*AVDD

MBVSEL=1

0.65*AVDD

Bias Current Source

IMICBIAS

Output Noise Voltage

1K to 20kHz

nV/

Hz

Digital Input / Output

Input HIGH Level

VIH

0.7

DBVDD

Input LOW Level

VIL

0.3

DBVDD

Output HIGH Level

VOH

IOL=1mA

0.9

DBVDD

Output LOW Level

VOL

IOH-1mA

0.1xDBVDD

Input capacitance

Input leakage

TERMINOLOGY

Input level to LIP is limited to a maximum of -3dB or THD+N performance will be reduced.

Note when BEEP path is not enabled then AUXL and AUXR have the same input impedances.

Hold Time is the length of time between a signal detected being too quiet and beginning to ramp up the gain. It does

not apply to ramping down the gain when the signal is too loud, which happens without a delay.

Ramp-up and Ramp-Down times are defined as the time it takes for the PGA to sweep across 90% of its gain range.

All hold, ramp-up and ramp-down times scale proportionally with MCLK

Signal-to-noise ratio (dB) – SNR is a measure of the difference in level between the full scale output and the output

with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).

THD+N (dB) – THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.

Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from

the other. Measured by applying a full scale signal to one channel input and measuring the level of signal apparent at

the other channel output.

The maximum output voltage can be limited by the speaker power supply. If OUT3BOOST, OUT4BOOST or

SPKBOOST is set then SPKVDD should be 1.5xAVDD to prevent clipping taking place in the output stage (when PGA

gains are set to 0dB).

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