WM8608 datasheet(8/54 Pages) WOLFSON

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WM8608

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PP Rev 1.5 March 2004

Test Conditions

AVDD, BVDD, DVDD = 2.7 to 3.3V, AGND, DGND, BGND = 0V, TA = -20 to +85

oC, fs = 44.1kHz/48kHz, MCLK = 256fs unless

stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PWM buffer drive strength

Isource

CMOS

Isink

20pF load

fs = 44.1kHz

352.8

kHz

PWM pulse repetition rate

fPWM

fs = 48kHz

384

kHz

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 AES17 low pass filter, except where noted an A-weight filter is used.

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.

Parameter guaranteed by design.

Validated using the following filter

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Filter

Stopband

-3dB

1.00

kHz

Note: A third order differential RC filter has been used

TERMINOLOGY

Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output

with no signal applied.

Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal.

Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB

to it (e.g. THD+N @ -60dB= -32dB, DR= 92dB).

THD+N (dB) - THD+N is a ratio, of the RMS values, of (Noise + Distortion)/Signal.

POWER CONSUMPTION

TYPICAL SUPPLY CURRENTS

[mA]

TOTAL CURRENT

[mA]

TOTAL POWER

[mW]

IBVDD

MODE DESCRIPTION

IAVDD

IDVDD

CMOS

LVDS

CMOS

LVDS

CMOS

LVDS

AVDD, DVDD, BVDD = 3.3V

OFF

Standby

0.02

0.28

0.30

0.99

Mute

1.76

27.2

7.55

29.0

36.5

58.0

121

191

Stereo

1.76

27.7

7.55

29.0

37.0

58.5

122

193

5.1

1.76

28.1

7.55

29.0

37.5

58.9

124

194

6.1

1.76

29.6

7.55

29.0

38.9

60.3

128

199

7.1

1.72

29.9

7.55

29.0

39.2

60.6

129

200

Table 1 Supply Current Consumption

Notes:

TA = +25

oC, Slave Mode, fs = 48kHz, MCLK = 27 kHz, 24-bit data

All figures are kHz 1kHz input sine wave @ 0dB.

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