WM9708

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 April 2001

4

ELECTRICAL CHARACTERISTICS

Test Characteristics:

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Logic Levels (DVDD = 3.3 or 5.0V)

Input LOW level

AGND -0.3

0.8

V

Input HIGH level

2.2

AVDD +0.3

V

Output LOW

0.10 x VDD

V

Output HIGH

0.90 x VDD

V

Analogue I/O Levels (Input Signals on any inputs, Outputs on LINEOUT L, R and MONOOUT)

Input level

Minimum input

impedance = 10k

AGND

-100mV

AVDD

+100mV

V

Output level

Into 10kohm load

AGND

+300mV

Near rail to

rail

AVDD

-300mV

V

Reference Levels

Reference input/output

CAP2

2/5 AVDD

AVDD/2

3/5 AVDD

V

CAP2 impedance

75

kohms

Mixer reference

VREF

Buffered

CAP2

V

MIC reference

VREFOUT

Buffered

CAP2

V

MIDBUFF current sink

(pins VREF and VREFOUT)

AVDD = 5V

-5

-15

mA

MIDBUFF current source

(pins VREF and VREFOUT)

AVDD = 5V

5

15

mA

MIDBUFF current source

(pins VREF and VREFOUT)

AVDD = 3.3V

10

mA

MIDBUFF current sink

(pins VREF and VREFOUT)

AVDD = 3.3V

-10

mA

DAC Circuit Specifications (AVDD = 5V) 48kHz sampling

SNR A-weighted (Note 1)

85

95

dBv

Full scale output voltage

VREF = 2.5V

1.0

Vrms

THD

-3dBfs input

74 (0.02%)

90

dBv

Frequency response

20

19,200

Hz

Transition band

19,200

28,800

Hz

Stop band

28,800

Hz

Out of band rejection

-40

dB

Spurious tone reduction

-100

dB

PSRR

20 to 20kHz

40

dB

ADC Circuit Specifications (AVDD = 5V) 48kHz sampling

SNR A-weighted (Note 1)

75

92

dB

ADC input for full scale output

VREF = 2.5V

1.0

Vrms

THD

-6dBv input

74

95

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