WM8940 datasheet(8/85 Pages) WOLFSON

8 / 85 page

WM8940

Pre-Production

Pre-Production, Rev 3.0, February 2007

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.8V, AVDD = DBVDD = 3.3V, 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 Input PGA Inputs (MICN, MICP)

INPPGAVOL and PGABOOST = 0dB

Full-scale Input Signal Level – Single-

ended input via LIN/RIN 1

AVDD/3.3

Vrms

Full-scale Input Signal Level –

Pseudo-differential input 1,2

AVDD*0.7/

3.3

Vrms

Input PGA equivalent input noise

INPPGAVOL = +35.25dB

No input signal

0 to 20kHz

76.5

MICN input resistance

INPPGAVOL = +35.25dB

1.6

Ω

MICN input resistance

INPPGAVOL = 0dB

Ω

MICN input resistance

INPPGAVOL = -12dB

Ω

MICP input resistance

All gain settings

Ω

Input Capacitance

All analogue input pins

Input PGA Programmable Gain

Gain adjusted by

INPPGAVOL

-12

+35.25

Programmable Gain Step Size

Guaranteed monotonic

0.75

Input PGA Mute Attenuation

INPPGAMUTE

108

Input Gain Boost

PGABOOST= 0

Input Gain Boost

PGABOOST = 1

+20

Auxiliary Analogue Inputs (AUX)

Full-scale Input Signal Level 2

AVDD/3.3

Vrms

Input Resistance

Input boost and mixer

enabled, at 0dB gain

Ω

Input Capacitance

All analogue Inputs

Gain range from AUX input PGA

mixers

Gain adjusted by

AUX2BOOSTVOL

-12

AUXLBOOSTVOL and

AUXRBOOSTVOL step size

Analogue to Digital Converter (ADC) - Input from MICN and MICN in differential configuration to input PGA

INPPGAVO, PGABOOST and ADCVOL = 0dB

Signal to Noise Ratio 3

SNR

A-weighted

AVDD=3.3V

Total Harmonic Distortion 4

THD

-1dBV Input

AVDD=3.3V

-83

Total Harmonic Distortion + Noise 5

THD+N

-1dBV Input

AVDD=3.3V

-77

Channel Separation 6

1kHz full scale input signal

100

dBFS

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