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WM8733

WOLFSON MICROELECTRONICS LTD

PP Rev 1.3 July 2000

3

ELECTRICAL CHARACTERISTICS

Test Characteristics

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Logic Levels

Input LOW level

0.8

V

Input HIGH level

2.0

V

Analogue Output Levels

Output level

Into 10kohm, full scale 0dB,

(5V supply)

Into 10kohm, full scale 0dB,

(3V supply)

0.6

o midrail or AC coupled (5V supply)

2

10

kohms

Minimum resistance load

o midrail or AC coupled (3V supply)

10

kohms

Maximum capacitance load

5V or 3V

100

pF

Output DC level

VDD/2

V

Reference Levels

Potential divider resistance

VDD to CAP and CAP to GND

80

100

120

kohms

Voltage at CAP

VDD/2

DAC Circuit Specifications

SNR (Note 1)

Stereo mode

98

102

dB

Mono mode

VDD = 5V

dB

Stereo mode

96

100

dB

Mono mode

VDD = 3V

dB

THD (full scale)

0dB

0.03

0.01

%

THD+N

-60dB

-35

-40

dB

Frequency response

0

20,000

Hz

Pass band ripple

±0.25

dB

Transition band

20,000

Hz

Out of band rejection

-40

dB

Stereo mode

100

dB

Dynamic

Range

Mono mode

dB

Channel Separation

90

dB

Gain mismatch

channel-to-channel

±1

±5

%FSR

Audio Data Input and System Clock Timing Information

BCKIN pulse cycle time

100

ns

BCKIN pulse width high

50

ns

BCKIN pulse width low

50

ns

BCKIN rising edge to LRCIN

edge

30

ns

LRCIN rising edge to BCKIN

rising edge

30

ns

DIN setup time

30

ns

DIN hold time

30

ns

System clock pulse width high

13

ns

System clock pulse width low

13

ns

Note 1

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

“A” weighted over a 20Hz to 20kHz bandwidth.

Note 2

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

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.