EVAL-AD7799EBZ View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-AD7799EBZ

3-Channel, Low Noise, Low Power, 16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp

Analog Devices 

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Data Sheet

AD7798/AD7799

Parameter

SYSTEM CALIBRATION2

Full-Scale Calibration Limit

Zero-Scale Calibration Limit

Input Span

POWER REQUIREMENTS7

Power Supply Voltage

AVDD – GND

DVDD – GND

Power Supply Currents

IDD Current

IDD (Power-Down Mode)

AD7798B/AD7799B1 Unit

1.05 × FS

V max

−1.05 × FS

0.8 × FS

2.1 × FS

V min

V min

V max

2.7/5.25

2.7/5.25

140

180

400

500

1

V min/max

V min/max

µA max

µA max

µA max

µA max

µA max

Test Conditions/Comments

FS = Full-scale analog input. When VREF = AVDD, the

differential input must be limited to (0.9 × VREF/gain)

if the in-amp is active.

Unbuffered mode, 110 µA typ @ AVDD = 3 V,

125 µA typ @ AVDD = 5 V

Buffered mode, gain = 1 or 2, 130 µA typ @ AVDD = 3 V,

165 µA typ @ AVDD = 5 V

AD7798: gain = 4 to 128, 300 µA typ @ AVDD = 3 V,

350 µA typ @ AVDD = 5 V

AD7799: gain = 4 to 128, 380 µA typ @ AVDD = 3 V,

440 µA typ @ AVDD = 5 V

1 Temperature range is –40°C to +105°C. At the 19.6 Hz and 39.2 Hz update rates, the INL, power supply rejection (PSR), common-mode rejection (CMR), and normal

mode rejection (NMR) do not meet the data sheet specification if the voltage on the AIN(+) or AIN(−) pins exceeds AVDD − 1.6 V typically. When this voltage is

exceeded, the INL, for example, is reduced to 18 ppm of FS typically and the PSR is reduced to 69 dB typically. Therefore, for guaranteed performance at these update

rates, the absolute voltage on the analog input pins needs to be below AVDD − 1.6 V.

2 Specification is not production tested, but is supported by characterization data at initial product release.

3 Following a calibration, this error is in the order of the noise for the programmed gain and update rate selected.

4 Recalibration at any temperature removes these errors.

5 Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (AVDD = 4 V, gain = 1, TA = 25°C).

6 FS[3:0] are the four bits used in the mode register to select the output word rate.

7 Digital inputs equal to DVDD or GND.

Rev. B | Page 5 of 28

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