WM8940(2011) Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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Компоненты Описание

производитель

WM8940
(Rev.:2011)

Mono CODEC with Speaker Driver

Wolfson Microelectronics plc 

Production Data

WM8940

Test Conditions

DCVDD = 1.8V, AVDD = DBVDD = 3.3V, SPKVDD =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 10k / 50pF load and DACVOL 0dB

Full-scale output 1

DACVOL = 0dB

AVDD/3.3

Signal to Noise Ratio 3

SNR

A-weighted

93

98

AVDD=SPKVDD=3.3V

Total Harmonic Distortion 4

THD

0dBFS input

-80

-75

AVDD=SPKVDD=3.3V

Total Harmonic Distortion + Noise 5

THD+N

0dBFS input

AVDD=SPKVDD=3.3V

-78

-74

Vrms

dB

dBFS

dBFS

Channel Separation 6

1kHz signal

100

dB

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

INPPGAVOL, PGABOOST = 0dB

Full-scale output voltage, 0dB gain

SPKVDD/3.3

Vrms

Signal to Noise Ratio 3

SNR

A-weighted

94

99

dB

Total Harmonic Distortion 4

Total Harmonic Distortion + Noise 5

Channel Separation 6

THD

THD+N

AVDD=SPKVDD=3.3V

full-scale signal

AVDD=SPKVDD=3.3V

full-scale signal

AVDD=SPKVDD=3.3V

-90

-85

dBFS

-87

-82

dBFS

100

dB

DAC to Speaker Output (SPKOUTP, SPKOUTN with 8 bridge tied load) Bypass mode

Output Power

Total Harmonic Distortion 4

Po

THD

Output power is closely correlated with THD see below

Po=350mW, RL = 8Ω

0.03

%

SPKVDD=3.3V

-70

-60

dB

Signal to Noise Ratio 3

SNR

A-weighted

93.5

98

dB

SPKVDD=3.3V

Power Supply Rejection Ratio

PSRR

RL = 8 BTL

50

dB

(50Hz-22kHz)

AUX In to Headphone Output (SPKOUTP, SPKOUTN with 16R resistive load to GND) Bypass mode

Signal to Noise Ratio 3

SNR

A-weighted

95

99

dB

SPKVDD=3.3V

Total Harmonic Distortion 4

THD

Po=20mW, RL = 16Ω

0.02

-67

%

SPKVDD=3.3V

-74

dB

Microphone Bias

Bias Voltage

Bias Current Source

Output Noise Voltage

MBVSEL=0

MBVSEL=1

for VMICBIAS within +/-3%

1kHz to 20kHz

0.9*AVDD

0.65*AVDD

3

15

V

V

mA

nV/Hz

Digital Input / Output

Input HIGH Level

Input LOW Level

Output HIGH Level

Output LOW Level

Input Capacitance

VIH

0.7

V

DBVDD

VIL

0.3DBVDD

V

VOH

IOL=1mA

0.9

V

DBVDD

VOL

IOH-1mA

All digital pins

0.1xDBVDD

V

10

pF

w

PD, Rev 4.3, November 2011

9

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