WM8944BECSSLASHR datasheet(10/165 Pages) CIRRUS

10 / 165 page

WM8944B

Rev 4.3

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.8V, DBVDD = LDOVDD = SPKVDD = 3.3V, LDOVOUT = 3.0V, GND = 0V,

TA = +25

oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB, 24-bit audio data unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Inputs (IN1, AUX)

Maximum input signal

level (changes in

proportion to

LDOVOUT)

Single-ended input

INPGA_VOL = 0dB

1.0

Vrms

dBV

Pseudo-differential input

INPGA_VOL = 0dB

0.7

-3.1

Vrms

dBV

Input resistance

(IN1/DMICDAT)

Input PGA path (+35.25dB)

4.5



Input PGA path (0dB)

105

Input PGA path (-12dB)

160

Output mixer path (0dB)

Output mixer path (-6dB)

Direct speaker (0dB)

Direct speaker (-6dB)

Input resistance

(AUX)

Input PGA path (All gain

settings)



Input capacitance

Analogue Inputs Programmable Gain Amplifier (PGA)

Minimum

programmable gain

-12

Maximum

programmable gain

35.25

Gain step size

Guaranteed monotonic

0.75

Mute attenuation

Common Mode

Rejection Ratio

1kHz input

110

Speaker Output Programmable Gain Amplifier (PGA)

Minimum

programmable gain

-57

Maximum

programmable gain

Gain step size

Guaranteed monotonic

Mute attenuation

ADC Input Path Performance (Input PGA to ADC)

SNR (A-weighted)

THD

-1dBFS input

-83

-72

THD+N

-1dBFS input

-77

-70

PSRR (with respect to

LDOVDD)

217Hz, 100mV pk-pk

1kHz, 100mV pk-pk

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