WM8941 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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componentes Descripción

Fabricante

WM8941

Mono CODEC with Speaker Driver and Video Buffer

Wolfson Microelectronics plc 

Pre Production

WM8941

Test Conditions

DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, SPKVDD =3.3V, , VBVDD=3.3V, TA = +25oC, 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 with 10kΩ / 50pF load and DACVOL 0dB

Full-scale output 1

DACVOL = 0dB

0.9*AVDD AVDD/3.3 1.05*AVDD Vrms

/3.3

/3.3

Signal to Noise Ratio 3

SNR

A-weighted

98

dB

AVDD=SPKVDD=3.3V

A-weighted

96

dB

AVDD=SPKVDD=2.5V

Total Harmonic Distortion 4

THD

0dBFS input

-80

dBFS

AVDD=SPKVDD=3.3V

Total Harmonic Distortion + Noise 5

THD+N

0dBFS input

-78

AVDD=SPKVDD=3.3V

dBFS

Channel Separation 6

1kHz signal

100

dB

MICP and MICN input PGA to input boost stage into 10kΩ / 50pF load on SPKOUTP and SPKOUTP

INPPGAVOL, PGABOOST = 0dB

Full-scale output voltage, 0dB gain

Signal to Noise Ratio 3

SNR

A-weighted

0.9*SPKVDD/ SPKVDD/3.3 1.05*SPKVD Vrms

3.3

D/3.3

98

dB

AVDD=SPKVDD=3.3V

Total Harmonic Distortion 4

THD

full-scale signal

-80

AVDD=SPKVDD=3.3V

Total Harmonic Distortion + Noise 5

THD+N

full-scale signal

-78

AVDD=SPKVDD=3.3V

Channel Separation 6

100

dBFS

dBFS

dB

Speaker Output (SPKOUTP, SPKOUTN with 8Ω bridge tied load)

Output Power

Total Harmonic Distortion 4

Po

THD

Output power is closely correlated with THD see below

Po=150mW, RL = 8Ω

0.03

%

SPKVDD=3.3V

68

dB

Po=350mW, RL = 8Ω

2.944

%

Signal to Noise Ratio 3

SNR

SPKVDD=3.3V

A-weighted

-30.6

dB

-98

dB

SPKVDD=3.3V

Power Supply Rejection Ratio

PSRR

RL = 8Ω BTL

50

dB

(50Hz-22kHz)

Headphone Output (SPKOUTP, SPKOUTN with resistive load to GND)

Signal to Noise Ratio 3

SNR

A-weighted

98

dB

SPKVDD=3.3V

Total Harmonic Distortion 4

THD

Po=20mW, RL = 16Ω

0.02

%

SPKVDD=3.3V

-72

dB

Video Buffer

Maximum output voltage swing

Vom

f=100kHz, THD=1%

1.10

1.25

1.50 Vp-p

Maximum Programmable Voltage

Gain 7

Av

RVBREF=187Ω, ROUT=75Ω,

5.08

6

RLOAD=75 Ω

Minimum Programmable Voltage Gain Av

RVBREF=187Ω, ROUT=75Ω, -0.92

0

7

RLOAD=75 Ω

Step Size

6

7.94 dB

1.94 dB

dB

Differential gain

DG

Vin=1Vp-p

-2.0

0.3

+2.0

%

Differential phase

Signal to Noise Ratio

SYNC tip offset above GND

DP

Vin=1Vp-p

-2.0

0.7

VSNR

+40

+60

VBDISOFF=0, Av = +6dB

0

40

+2.0 Deg

+100 dB

75

mV

w

PP, Rev 3.3, December 2007

9

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