WM8956 datasheet(6/80 Pages) CIRRUS

Part #	WM8956

Description	Hi-Fi DAC with 1W Stereo Class D Speaker Drivers

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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6 / 80 page

WM8956

Production Data

w

PD, November 2011, Rev 4.1

6

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD = 1.8V, DBVDD = 3.3V, AVDD = SPKVDD1 = SPKVDD2 = 3.3V, 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 (LINPUT1, RINPUT1, LINPUT2, LINPUT3, RINPUT2, RINPUT3)

Full-scale Input Signal Level –

note this changes in proportion

to AVDD

VINFS

L/RINPUT1,2,3

Single-ended

1.0

0

Vrms

dBV

L/RINPUT1,2,3

Differential MIC

0.5

-6

Vrms

dBV

Mic PGA equivalent input noise

0 to 20kHz,

+30dB gain

150

uV

Input resistance

(Note that input boost and

bypass path resistances will be

seen in parallel with PGA input

resistance when these paths are

enabled)

L/RINPUT1

+30dB PGA gain

Differential or single-

ended MIC configuration

3

k



L/RINPUT1

0dB PGA gain

Differential or single-

ended MIC configuration

49

k



L/RINPUT1

-17.25dB PGA gain

Differential or single-

ended MIC configuration

87

k



L/RINPUT2,

L/RINPUT3

(Constant for all gains)

Differential MIC

configuration

85

k



L/RINPUT2,

L/RINPUT3

Max boost gain

L/RINPUT2/3 to boost

7.5

k



L/RINPUT2,

L/RINPUT3

0dB boost gain

L/RINPUT2/3 to boost

13

k



L/RINPUT2,

L/RINPUT3

Min boost gain

L/RINPUT2/3 to boost

37

k



L/RINPUT3

Max bypass gain

L/RINPUT3 to bypass

17

k



L/RINPUT3

Min bypass gain

L/RINPUT3 to bypass

70

k



Input capacitance

10

pF

MIC Programmable Gain Amplifier (PGA)

Programmable Gain Min

-17.25

dB

Programmable Gain Max

30

dB

Programmable Gain Step Size

Guaranteed monotonic

0.75

dB

Mute Attenuation

LMIC2B = 0 and

RMIC2B = 0

85

dB

Selectable Input Gain Boost

Gain Boost Steps

Input from PGA

0, 13, 20,

29, MUTE

dB

Input from L/RINPUT2 or

L/RINPUT3

-12, -9, -6,

-3, 0, 3, 6,

MUTE

dB

Headphone Outputs (HP_L, HP_R)

0dB Full scale output voltage

AVDD/3.3

Vrms

Mute attenuation

1kHz, full scale signal

86

dB

Channel Separation

L/RINPUT3 to headphone

outputs via bypass

110

dB

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