Advanced Information

WM9707

WOLFSON MICROELECTRONICS LTD

AI Rev 2.2 January 2001

5

Test Characteristics:

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ADC Circuit Specifications (AVDD = 3.3V) 48kHz sampling

SNR A-weighted (Note 1)

85

dB

ADC input for full scale output

VREF = 1.65V

0.7

Vrms

THD

-6dBv input

80

dB

Frequency response

20

19,200

Hz

Transition band

19,200

28,800

Hz

Stop band

28,800

Hz

Stop band rejection

-74

dB

PSRR

20 to 20kHz

40

dB

Mixer Circuit Specifications (AVDD = 3.3V) 48kHz sampling

SNR CD path A-weighted

(Note 1)

95

dB

SNR Other paths A-weighted

(Note 1)

90

dB

Maximum input voltage

0.6

Vrms

Maximum output voltage on

LINEOUT

1.2

Vrms

THD (Note 2)

-3.6dBv input

85

dBv

Frequency response (+/-1dB)

20

20,000

Hz

Input impedance (CD inputs)

At any gain

15

kohm

At max gain

20

kohm

Input impedance (other Mixer

inputs)

At 0db gain

100

kohm

At max gain

30

kohm

Input impedance MIC inputs

At 0db gain

110

kohm

PSRR

20 to 20kHz

50

dB

Clock Frequency Range

Crystal clock

24.576

MHz

BIT_CLK frequency

12.288

MHz

SYNC frequency

48.0

kHz

Notes:

1.

SNR is the ratio of 0dB signal output to the output level with no signal, measured A-weighted over a 20Hz to 20kHz

bandwidth.

2.

Inputs are scaled for AVDD eg; 0dBv at 5.0V is equivalent to –3.6dBv at 3.3V.