WM8974 datasheet(7/63 Pages) WOLFSON

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WM8974

PP Rev 1.1 September 2004

Test Conditions

DCVDD = 1.62V, AVDD = DBVDD = 3.3V, TA = +25

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

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital to Analogue Converter (DAC) to MONO output (all data measured with 10k

Ω / 50pF load)

Signal to Noise Ratio (Note 5)

SNR

A-weighted

TBD

Total Harmonic Distortion

(Note 7)

THD

RL = 10 k

Ω

full-scale signal

-84

MONOBOOST=0

AVDD/3.3

0dB Full Scale output voltage

(Note 9)

MONOBOOST=1

1.5x

(AVDD/3.3)

VRMS

Speaker Output PGA

Programmable Gain

-57

Programmable Gain Step Size

Guaranteed monotonic

BTL Speaker Output (SPKROUTP, SPKROUTN with 8

Ω

Ω bridge tied load)

Output Power

Output power is very closely correlated with THD; see below

PO =180mW, RL = 8

Ω,

SPKRVDD=3.3V

0.3

-50

PO =400mW, RL = 8

Ω,

SPKRVDD=3.3V

1.0

-40

PO =360mW, RL = 8

Ω,

SPKRVDD=5V

0.3

-50

Total Harmonic Distortion

THD

PO =800mW, RL = 8

Ω,

SPKRVDD=5V

-40

SPKRVDD=3.3V,

RL = 8

Ω

Signal to Noise Ratio

SNR

SPKRVDD=5V,

RL = 8

Ω

Power Supply Rejection Ratio

‘Headphone’ output (SPKROUTP, SPKROUTN with resistive load to ground)

Signal to Noise Ratio

SNR

Total Harmonic Distortion

THD

Po=20mW, RL = 16

Ω,

SPKRVDD=3.3V

0.008

-81

Po=20mW, RL = 32

Ω,

SPKRVDD=3.3V

0.007

- 83

Microphone Bias

Bias Voltage (MBVSEL=0)

VMICBIAS

0.9*AVDD

Bias Voltage (MBVSEL=1)

VMICBIAS

0.75*AVDD

Bias Current Source

IMICBIAS

Output Noise Voltage

1K to 20kHz

nV/

√Hz

Digital Input / Output

Input HIGH Level

VIH

0.7

×DVDD

Input LOW Level

VIL

0.3

×DVDD

Output HIGH Level

VOH

IOL=1mA

0.9

×DVDD

Output LOW Level

VOL

IOH-1mA

0.1xDVDD

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