WM8722 datasheet(4/23 Pages) WOLFSON

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WM8722

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 1.5 May 2000

ELECTRICAL CHARACTERISTICS

Test Conditions

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

oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DAC Circuit Specifications

SNR (Note 1 and 2)

AVDD, DVDD = 5V, fs = 48kHz

102

AVDD, DVDD = 3.3V, fs = 48kHz

AVDD, DVDD = 5V, fs = 96kHz

100

THD (Note 2)

0dB

-95

-80

Dynamic range (Note 2)

-60dB

102

Passband

±0.25dB

0.4535fs

Stopband

-3dB

0.491fs

Passband ripple

±0.25

Stopband Attenuation

f > 0.55fs

Channel Separation

100

Gain mismatch

channel-to-channel

±1

±5

%FSR

Digital Logic Levels

Input LOW level

VIL

0.8

Input HIGH level

VIH

2.0

Output LOW level

VOL

IOL = 2mA

AVSS + 0.3V

Output HIGH level

VOH

IOH = 2mA

AVDD - 0.3V

Analogue Output Levels

Output level

Into 10kohm, full scale 0dB,

(5V supply)

1.1

Vrms

Into 10kohm, full scale 0dB,

(3.3V supply)

0.66

Vrms

To midrail or AC coupled

(5V supply)

kohms

Minimum resistance load

To midrail or AC coupled

(3.3V supply)

600

ohms

Maximum capacitance

load

5V or 3.3V

100

Output DC level

AVDD/2

Reference Levels

Potential divider

resistance

AVDD to CAP and CAP to AGND

kohms

Voltage at CAP

AVDD/2

POR

POR threshold

1.2

1.6

2.0

Analogue Mixer Specifications

SNR

100

THD

1V rms output, Into 10kohm, 50pF

load

-96

-92

Dynamic Range

100

Channel Separation

100

Output voltage

Into 10kohm

1.5

Vrms

Output current source

Output current sink

1.5

Input voltage, MIXINL/R

AC coupled

Vrms

MIXINL/R input resistance

0dB

kohm

MIXINL/R input resistance

(at 12dB trim)

kohm

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