AD7720 Просмотр технического описания (PDF) - Analog Devices

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производитель

AD7720

CMOS Sigma-Delta Modulator

Analog Devices 

Parameter

B Version

Units

Test Conditions/Comments

LOGIC INPUTS

VIH, Input High Voltage

VIL, Input Low Voltage

IINH, Input Current

CIN, Input Capacitance

LOGIC OUTPUTS

VOH, Output High Voltage

VOL, Output Low Voltage

POWER SUPPLIES

AVDD

DVDD

IDD (Total for AVDD, DVDD)

Active Mode

Standby Mode

2

0.8

10

10

2.4

0.4

4.75/5.25

4.75/5.25

43

25

V min

V max

µA max

pF max

V min

V max

|IOUT| ≤ 200 µA

|IOUT| ≤ 1.6 mA

V min/V max

V min/V max

mA max

µA max

Digital Inputs Equal to 0 V or DVDD

NOTES

1Operating temperature range is as follows: B Version: –40°C to +85°C.

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

3Applies after calibration at temperature of interest.

4Measurement Bandwidth = 0.5 × fMCLK; Input Level = –0.05 dB.

5TA = +25°C to +85°C/TA = TMIN to TMAX.

Specifications subject to change without notice.

AD7720

BIT STREAM 90.625kHz

120dB

DECIMATE

BY 32

90.625kHz

90dB

DECIMATE

BY 2

16-BIT

OUTPUT

FILTER 1

292.969kHz

BANDWIDTH = 90.625 kHz

TRANSITION = 292.969kHz

ATTENUATION = 120dB

COEFFICIENTS = 384

FILTER 2

104.687kHz

BANDWIDTH = 90.625 kHz

TRANSITION = 104.687kHz

ATTENUATION = 90dB

COEFFICIENTS = 151

Figure 1. Digital Filter (Consists of 2 FIR Filters). This filter is implemented on the AD7722.

REV. 0

–3–

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