XWM8731EDS datasheet(9/56 Pages) WOLFSON

Part #	XWM8731EDS

Description	Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates

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Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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9 / 56 page

WM8731

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 February 2001

9

Test Conditions

AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25

oC, Slave Mode, fs = 48kHz, XTI/MCLK =

256fs unless otherwise stated.

PARAMETER

SYMBOL

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

Programmable Gain Boost

MICBOOST bit

set

1kHz input

Rsource < 50 Ohms

34

dB

Mic Path gain (MICBOOST gain

is additional to this nominal

gain)

MICBOOST = 0

Rsource < 50 Ohms

14

dB

Mute attenuation

0dB, 1kHz input

80

dB

Input Resistance

RINMIC

8k

10k

12k

Ohms

Input Capacitance

CINMIC

10

pF

Microphone Bias

Bias Voltage

VMICBIAS

.75*AVDD –

100mV

0.75*AVDD

.75*AVDD +

100mV

V

Bias Current Source

IMICBIAS

3mA

Output Noise Voltage

Vn

1K to 20kHz

25

nV/

√Hz

Line Output for DAC Playback Only (Load = 10k ohms. 50pF)

0dBfs Full scale output voltage

At LINE outputs

1.0 x

AVDD/3.3

Vrms

SNR (Note 1,2,3)

A-weighted,

@ fs = 48kHz

90

100

dB

SNR (Note 1,2,3)

A-weighted

@ fs = 96kHz

98

dB

SNR (Note 1,2,3)

A-weighted,

@ fs = 48kHz, AVDD

= 2.7V

93

dB

Dynamic Range (Note 3)

DR

A-weighted, -60dB

full scale input

85

90

dB

1kHz, 0dBfs

-88

-80

dB

THD

1kHz, -3dBfs

-92

-86

dB

Power Supply Rejection Ratio

PSSR

1kHz 100mVpp

50

dB

20Hz to 20kHz

100mVpp

45

dB

DAC channel separation

100

dB

Analogue Line Input to Line Output (Load = 10k ohms. 50pF, No Gain on Input ) Bypass Mode

0dB Full scale output voltage

1.0 x

AVDD/3.3

Vrms

SNR (Note 1, 3)

90

95

dB

1kHz, 0dB

-86

-80

dB

THD

1kHz, -3dB

-92

-86

dB

Power Supply Rejection Ratio

PSSR

1kHz 100mVpp

50

dB

20Hz to 20kHz

100mVpp

45

dB

Mute attenuation

1kHz, 0dB

80

dB

Stereo Headphone Output

0dB Full scale output voltage

1.0 x

AVDD/3.3

Vrms

Max Output Power RL = 32

ohms

PO

30

mW

Max Output Power RL = 16

ohms

PO

40

mW

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