WM8978GEFL/RV Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM8978GEFL/RV

Stereo CODEC With Speaker Driver

Wolfson Microelectronics plc 

WM8978

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Test Conditions

DCVDD=1.8V, AVDD=DBVDD=SPKVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise

stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Speaker Output (LOUT2, ROUT2 with 8Ω bridge tied load, INVROUT2=1)

Full scale output voltage, 0dB

gain. (Note 10)

SPKBOOST=0

SPKBOOST=1

SPKVDD/3.3

(SPKVDD/3.3)*1.5

Vrms

Output Power

PO

Output power is very closely correlated with THD; see below

Total Harmonic Distortion

THD

PO =180mW, RL = 8Ω,

0.3

%

SPKVDD=3.3V

-50

dB

PO =400mW, RL = 8Ω,

1.0

%

SPKVDD=3.3V

-40

dB

PO =360mW, RL = 8Ω,

0.3

%

SPKVDD=5V

-50

dB

PO =800mW, RL = 8Ω,

1

%

SPKVDD=5V

-40

dB

Signal to Noise Ratio

SNR

SPKVDD=3.3V,

90

dB

RL = 8Ω

SPKVDD=5V,

90

dB

RL = 8Ω

Power Supply Rejection Ratio

50

dB

OUT3/OUT4 outputs (with 10kΩ / 50pF load)

Full-scale output voltage, 0dB

gain (Note 10)

OUT3BOOST=0/

OUT4BOOST=0

SPKVDD/3.3

Vrms

OUT3BOOST=1

(SPKVDD/3.3)*1.5

Vrms

OUT4BOOST=1

Signal to Noise Ratio (Note 6,7)

SNR

A-weighted

TBD

98

dB

Total Harmonic Distortion

THD

RL = 10 kΩ

-84

dB

(Note 8)

full-scale signal

Channel Separation (Note 9)

1kHz signal

80

100

dB

Microphone Bias

Bias Voltage

VMICBIAS

MBVSEL=0

0.9*AVDD

V

MBVSEL=1

0.75*AVDD

V

Bias Current Source

IMICBIAS

3

mA

Output Noise Voltage

Vn

1K to 20kHz

15

nV/√Hz

Digital Input / Output

Input HIGH Level

VIH

0.7×DBVDD

V

Input LOW Level

VIL

0.3×DBVDD

V

Output HIGH Level

VOH

IOL=1mA

0.9×DBVDD

V

Output LOW Level

VOL

IOH-1mA

0.1xDBVDD

V

Input capacitance

TBD

pF

Input leakage

TBD

pA

w

PP Rev 1.7 January 2005

8

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