WM8741 datasheet(11/64 Pages) WOLFSON

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Production Data

WM8741

PD, Rev 4.2, October 2009

TEST CONDITIONS

AVDD = 5V, DVDD = 3.3V, AGND, DGND = 0V, TA = +25

oC, 1kHz test signal, fs = 48kHz, MCLK = 512fs unless otherwise

stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Internal Analogue Filter

Bandwidth

-3dB

474

kHz

Passband edge response

20kHz

-0.0077

Analogue Output Levels

PCM full scale differential

output level

Into 10kΩ load, 0dBFS input

VRMS

DSD Direct differential

output level

Into 10kΩ load, 0dBDSD input

0.948

VRMS

DSD Plus differential output

level

Into 10kΩ load, 0dBDSD input

0.991

VRMS

Minimum resistance load

To midrail or AC coupled

kΩ

Maximum capacitance load

Output DC level

AVDD/2

Reference Levels

Potential divider resistance

AVDD to VMIDL/VMIDR and

VMIDL/VMIDR to AGND

kΩ

Voltage at VMIDL/VMIDR

AVDD/2

Notes:

Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’

weighted over a 20Hz to 20kHz bandwidth.

All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD

and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass filter

removes out of band noise; although it is not audible it may affect dynamic specification values.

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