AD7725_15 datasheet(3/28 Pages) AD

Part #	AD7725

Description	16-Bit 900 kSPS ADC with a Programmable Postprocessor

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REV. A

AD7725

–3–

B Version

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

ALL LOGIC INPUTS

I

IN, Input Current

V

IN = 0 V to DVDD

±10

µA

C

IN, Input Capacitance

10

pF

LOGIC OUTPUTS

V

OH, Output High Voltage

|I

OUT| = 200

µA

4.0

V

OL, Output Low Voltage

|I

OUT| = 1.6 mA

0.4

V

POWER SUPPLIES

10

AV

DD

4.75

5.25

V

AI

DD

11

HALF_PWR = Logic High

12

28

33

mA

DV

DD

4.75

5.25

V

DI

DD

13

With the Filter in Figure 1

84

90

mA

Power Consumption

14

Standby Mode

30

mW

NOTES

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

°C to +85°C.

2f

CLKIN is the CLKIN frequency.

3See Terminology section.

4F

O = output data rate.

5When using the internal reference, THD and SFDR specifications apply only to input signals above 10 kHz with a 10

µF decoupling capacitor between REF2 and

AGND2. At frequencies below 10 kHz, THD degrades to –80 dB and SFDR degrades to –83 dB.

6See Figures 23 and 24 for information regarding the number of filter taps allowed and the current consumption as the CLKIN frequency is varied.

7The AD7725 can operate with an external reference input in the range of 1.2 V to 3.15 V.

8Guaranteed by the design.

9Gain Error excludes reference error.

10All I

DD tests are done with the digital inputs equal to 0 V or DV DD.

11Analog current does not vary as the CLKIN frequency and the number of filter taps used in the postprocessor is varied.

12If HALF_PWR is logic low, AI

DD will typically double.

13Digital current varies as the CLKIN frequency and the number of filter taps used in the postprocessor is varied. See Figures 23 and 24.

14Digital inputs static and equal to 0 V or DV

DD.

Specifications subject to change without notice.

CUTOFF FREQUENCY = 50kHz

STOP-BAND FREQUENCY = 116kHz

NUMBER OF FILTER TAPS USED IN

THE POSTPROCESSOR = 108

OUPUT DATA RATE = CLKIN/16

FREQUENCY – kHz

0

–140

0

300

50

100

150

200

250

–20

–40

–60

–100

–120

–80

116

Figure 1. Digital Filter Characteristics Used for Specifications

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