WM8771IFT 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM8771IFT

24-bit, 192kHz 8-Channel Codec

Wolfson Microelectronics plc 

WM8771

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RECOMMENDED OPERATING CONDITIONS

PARAMETER

Digital supply range

Analogue supply range

Ground

Difference DGND to AGND

SYMBOL

DVDD

AVDD

AGND, DGND

TEST CONDITIONS

MIN

2.7

2.7

-0.3

TYP

0

0

MAX

3.6

5.5

+0.3

UNIT

V

V

V

V

Note: digital supply DVDD must never be more than 0.3V greater than AVDD.

ELECTRICAL CHARACTERISTICS

Test Conditions

AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.

PARAMETER

SYMBOL TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Logic Levels (TTL Levels)

Input LOW level

VIL

Input HIGH level

VIH

0.8

V

2.0

V

Output LOW

Output HIGH

VOL

IOL=1mA

VOH

IOH=1mA

0.9 x VDD

0.1 x VDD

V

V

Analogue Reference Levels

Reference voltage

VVMID

AVDD/2 – AVDD/2 AVDD/2 +

V

50mV

50mV

Potential divider resistance

RVMID

AVDD to VMID and

40k

50k

60k

Ohms

VMID to AGND

DAC Performance (Load = 10k ohms, 50pF)

0dBFs Full scale output voltage

1.0 x

Vrms

AVDD/5

SNR (Note 1,2)

A-weighted,

104

108

dB

@ fs = 48kHz

SNR (Note 1,2)

A-weighted

108

dB

@ fs = 96kHz

Dynamic Range (Note 2)

DNR

A-weighted, -60dB

104

108

dB

full scale input

Total Harmonic Distortion (THD)

1kHz, 0dBFs

-97

-90

dB

DAC channel separation

100

dB

Power Supply Rejection Ratio

PSRR

1kHz 100mVpp

50

dB

20Hz to 20kHz

45

dB

100mVpp

ADC Performance

Input Signal Level (0dB)

1.0 x

Vrms

AVDD/5

SNR (Note 1,2)

A-weighted, 0dB gain

93

97

dB

@ fs = 48kHz

SNR (Note 1,2)

A-weighted, 0dB gain

94

dB

@ fs = 96kHz

Dynamic Range (Note 2)

A-weighted, -60dB

97

dB

full scale input

Total Harmonic Distortion (THD)

kHz, 0dBFs

-90

-87

dB

1kHz, -3dBFs

-95

-90

dB

ADC Channel Separation

1kHz Input

90

dB

w

PP Rev 2.0 December 2001

6

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