WM8904 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM8904

Ultra Low Power CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8904

Pre-Production

OUTPUT SIGNAL PATH

High Performance Stereo Playback to Headphones - DAC input to HPOUTL+HPOUTR pins with 15 load

Test conditions:

HPOUTL_VOL = HPOUTR_VOL = 111001b (0dB)

Low Power Playback mode disabled. (See Table 49 for details; note that Low Power Playback mode is disabled by default.)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN TYP

MAX

UNIT

Output Power (per Channel)

Po

1% THD

RLoad= 30

28

0.92

-0.76

mW

Vrms

dBV

1% THD

32

mW

RLoad= 15

0.69

-3.19

Vrms

dBV

DC Offset

DC servo enabled,

-1.5

calibration complete.

+1.5

mV

Signal to Noise Ratio

SNR

A-weighted

90

96

dB

Total Harmonic Distortion + Noise

Channel Separation

THD+N

RL=30; Po=2mW

RL=30; Po=20mW

RL=15; Po=2mW

RL=15; Po=20mW

1kHz signal, 0dBFS

10kHz signal, 0dBFS

-91

-84

-87

-80

dB

-85

100

90

dB

Channel Level Matching

1kHz signal, 0dBFS

+/-1

dB

Power Supply Rejection Ratio

PSRR

217Hz, 100mVpk-pk

75

dB

1kHz, 100mV pk-pk

70

Low Power Stereo Playback to Headphones - DAC input to HPOUTL+HPOUTR pins with 15 load

Test conditions:

HPOUTL_VOL = HPOUTR_VOL = 111001b (0dB)

Low Power Playback Mode enabled (see Table 48 for details)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN TYP

Output Power (per Channel)

Po

1% THD

RLoad= 30

27

0.90

-0.92

1% THD

30

RLoad= 15

0.67

-3.5

Signal to Noise Ratio

SNR

A-weighted

95

Total Harmonic Distortion + Noise

THD+N

RL=30; Po=2mW

-91

RL=30; Po=20mW

-83

RL=15; Po=2mW

-87

RL=15; Po=20mW

-80

MAX

UNIT

mW

Vrms

dBV

mW

Vrms

dBV

dB

dB

w

PP, Rev 3.3, September 2012

16

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