AD7851ARS datasheet(3/36 Pages) AD

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AD7851

–3–

REV. A

Parameter

Units

Test Conditions/Comments

POWER PERFORMANCE

AVDD, DVDD

+4.75/+5.25

V min/max

IDD

Normal Mode

mA max

AVDD = DVDD = 4.75 V to 5.25 V. Typically

12 mA.

Sleep Mode

With External Clock On

µA typ

Full Power-Down. Power management bits

in control register set as PMGT1 = 1, PMGT0 = 0.

600

µA typ

Partial Power-Down. Power management bits in

control register set as PMGT1 = 1, PMGT0 = 1.

With External Clock Off

µA max

Typically 1

µA. Full Power-Down. Power

management bits in control register set as

PMGT1 = 1, PMGT0 = 0.

300

µA typ

Partial Power-Down. Power management bits in

control register set as PMGT1 = 1, PMGT0 = 1.

Normal Mode Power Dissipation

89.25

mW max

VDD = 5.25 V: Typically 63 mW; SLEEP = VDD.

Sleep Mode Power Dissipation

With External Clock On

105

µW typ

VDD = 5.25 V; SLEEP = 0 V

With External Clock Off

52.5

µW max

VDD = 5.25 V; Typically 5.25 µW; SLEEP = 0 V

SYSTEM CALIBRATION

Offset Calibration Span

+0.05

× V

REF/–0.05 × VREF

V max/min

Allowable Offset Voltage Span for Calibration

Gain Calibration Span

+1.025

× V

REF/–0.975

× V

REF

V max/min

Allowable Full-Scale Voltage Span for Calibration

NOTES

1Temperature ranges as follows: A Version, –40

°C to +125°C; K Version, 0°C to +125°C.

2Specifications apply after calibration.

3SNR calculation includes distortion and noise components.

4Sample tested @ +25

°C to ensure compliance.

5All digital inputs @ DGND except for CONVST, SLEEP, CAL, and SYNC @ DV

DD. No load on the digital outputs. Analog inputs @ AGND.

6CLKIN @ DGND when external clock off. All digital inputs @ DGND except for CONVST, SLEEP, CAL, and SYNC @ DV

DD. No load on the digital outputs.

Analog inputs @ AGND.

7The offset and gain calibration spans are defined as the range of offset and gain errors that the AD7851 can calibrate. Note also that these are voltage spans and are

not absolute voltages (i.e., the allowable system offset voltage presented at AIN(+) for the system offset error to be adjusted out will be AIN(–)

± 0.05 × V

REF, and the

allowable system full-scale voltage applied between AIN(+) and AIN(–) for the system full-scale voltage error to be adjusted out will be VREF ± 0.025 × VREF). This is

explained in more detail in the calibration section of the data sheet.

Specifications subject to change without notice.

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