AD7739 datasheet(3/32 Pages) AD

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Data Sheet

AD7739

Rev. A | Page 3 of 32

SPECIFICATIONS

–40°C to +105°C; AVDD = 5 V ± 5%; DVDD = 2.7 V to 3.6 V, or 5 V ± 5%; REFIN(+) = 2.5 V; REFIN(–) = 0 V, AINCOM = 2.5 V; Internal

Buffer On, AIN Range = ±1.25 V; fMCLKIN = 6.144 MHz; unless otherwise noted.

Table 1.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

ADC PERFORMANCE, CHOPPING

ENABLED

Conversion Time Rate

372

11840

Configure via conv. time register

No Missing Codes1, 2

Bits

FW ≥ 12 (conversion time ≥ 290 μs)

Output Noise

See Table 5

Resolution

See Table 6

and Table 7

Integral Nonlinearity (INL)2

±0.0005

±0.0015

% of FSR

Offset Error (Unipolar, Bipolar)3

±10

μV

Before calibration

Offset Drift vs. Temperature1

±25

nV/°C

Gain Error3

±0.2

Before calibration

Gain Drift vs. Temperature1

±2.5

ppm of FS/°C

Positive Full-Scale Error3

±0.2

% of FSR

Before calibration

Positive Full-Scale Drift vs. Temp.1

±2.5

ppm of FS/°C

Bipolar Negative Full-Scale Error4

±0.0030

% of FSR

After calibration

Common-Mode Rejection

At dc, AIN = 1 V

Power Supply Rejection

At dc, AIN = 1 V

ADC PERFORMANCE, CHOPPING

DISABLED

Conversion Time Rate

737

15133

Configure via conv. time register

No Missing Codes1, 2

Bits

 12 (conversion time  290 μs)

Output Noise

See Table 8

Resolution

See Table 9

and Table 10

Integral Nonlinearity (INL)2

±0.0015

% of FSR

Offset Error (Unipolar, Bipolar)5

±1

Before calibration

Offset Drift vs. Temperature

±1.5

μV/°C

Gain Error3

±0.2

Before calibration

Gain Drift vs. Temperature

±2.5

ppm of FS/°C

Positive Full-Scale Error3

±0.2

% of FSR

Before calibration

Positive Full-Scale Drift vs. Temp.

±2.5

ppm of FS/°C

Bipolar Negative Full-Scale Error4

±0.0030

% of FSR

After calibration

Common-Mode Rejection

At dc, AIN = 1 V

Power Supply Rejection

At dc, AIN = 1 V

ANALOG INPUTS

Analog Input Voltage1, 6

±2.5 V Range

±2.5

2.5 V Range

0 to 2.5

±1.25 V Range

±1.25

1.25 V Range

0 to 1.25

±0.625 V Range

±0.625

0.625 V Range

0 to 0.625

AIN, AINCOM Common-Mode/

Absolute Voltage1

0.2

AVDD − 0.3

Analog Input Slew Rate1, 7

0.5

V/conv. time

AIN absolute voltage > 3 V

AIN, AINCOM Input Current1, 8

Only one channel, chop disabled

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