AD7724AST datasheet(3/14 Pages) AD

3 / 14 page

REV. A

–3–

AD7724

Parameter

A Version

Unit

Test Conditions/Comments

LOGIC OUTPUTS

VOH, Output High Voltage

DVDD1 – 0.2

V min

|IOUT|

≤ 200 µA

VOL, Output Low Voltage

0.4

V max

|IOUT|

≤ 1.6 mA

POWER SUPPLIES

AVDD/DVDD

4.75/5.25

V min/V max

DVDD1

2.85/5.25

V min/V max

IDD (Total for AVDD, DVDD)

Digital Inputs Equal to 0 V or DVDD

Active Mode

mA max

Standby Mode

µA max

NOTES

1Operating temperature range is as follows: A Version: –40

°C to +85°C.

2Gain Error excludes reference error. The modulator gain is calibrated wrt the voltage on the REF2 pin.

3Measurement Bandwidth = 0.5

× f

MCLK; Input Level = –0.05 dB.

4When a square wave clock is used, the dynamic specifications will degrade by 1 dB typically.

Specifications subject to change without notice.

BIT STREAM

94.25kHz

FILTER 1

120dB

304.687kHz

BANDWIDTH = 94.25kHz

TRANSITION = 304.687kHz

ATTENUATION = 120dB

COEFFICIENTS = 384

DECIMATE

BY 32

FILTER 2

16-BIT

OUTPUT

94.25kHz

90dB

108.874kHz

BANDWIDTH = 94.25kHz

TRANSITION = 108.874kHz

ATTENUATION = 90dB

COEFFICIENTS = 151

DECIMATE

BY 2

Figure 1. Digital Filter (Consists of Two FIR Filters). This Filter is implemented on the AD7722.

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