WM8976 datasheet(7/108 Pages) WOLFSON

7 / 108 page

Pre-Production

WM8976

PP Rev 3.0 April 2006

ELECTRICAL CHARACTERISTICS

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

Microphone Preamp Inputs (LIP, LIN, RIP)

Full-scale Input Signal Level –

note this changes in proportion

to AVDD (Note 1)

VINFS

PGABOOST = 0dB

INPPGAVOL = 0dB

1.0

Vrms

dBV

Mic PGA equivalent input noise

At 35.25dB

gain

0 to 20kHz

150

RMICIN

Gain set to 35.25dB

1.6

Ω

RMICIN

Gain set to 0dB

Ω

RMICIN

Gain set to -12dB

Ω

RMICIP

L/RIP2INPPGA = 1

Ω

Input resistance

CMICIN

MIC Programmable Gain Amplifier (PGA)

Programmable Gain

-12

35.25

Programmable Gain Step Size

Guaranteed monotonic

0.75

Mute Attenuation

120

Selectable Input Gain Boost (0/+20dB)

Boost disabled

Gain Boost on PGA input

Boost enabled

Gain range from AUXL or L2

input to boost/mixer

-12

Gain step size to boost/mixer

Auxilliary Analogue Inputs (AUXL, AUXR)

Full-scale Input Signal Level

(0dB) – note this changes in

proportion to AVDD

VINFS

AVDD/3.3

Vrms

dBV

Input Capacitance

CMICIN

Automatic Level Control (ALC)

Target Record Level

-22.5

-1.5

Programmable gain

-12

35.25

Gain Hold Time (Note 3,5)

tHOLD

MCLK = 12.288MHz

(Note 3)

0, 2.67, 5.33, 10.67, … , 43691

(time doubles with each step)

ALCMODE=0 (ALC),

MCLK=12.288MHz

(Note 3)

3.3, 6.6, 13.1, … , 3360

(time doubles with each step)

Gain Ramp-Up (Decay) Time

(Note 4,5)

tDCY

ALCMODE=1 (limiter),

MCLK=12.288MHz

(Note 3)

0.73, 1.45, 2.91, … , 744

(time doubles with each step)

ALCMODE=0 (ALC),

MCLK=12.288MHz

(Note 3)

0.83, 1.66, 3.33, … , 852

(time doubles with each step)

Gain Ramp-Down (Attack) Time

(Note 4,5)

tATK

ALCMODE=1 (limiter),

MCLK=12.288MHz

(Note 3)

0.18, 0.36, 0.73, … , 186

(time doubles with each step)

Mute Attenuation

120

Analogue to Digital Converter (ADC)

Signal to Noise Ratio (Note 6)

SNR

A-weighted, 0dB gain

Total Harmonic Distortion

(Note 7)

THD

-3dBFS input

-84

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