Datasheet
Data Sheet AD7739
Rev. A | Page 3 of 32
SPECIFICATIONS
–40°C to +105°C; AV
DD
= 5 V ± 5%; DV
DD
= 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; f
MCLKIN
= 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 Hz Configure via conv. time register
No Missing Codes
1, 2
24 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. Temperature
1
±25 nV/°C
Gain Error
3
±0.2 % Before calibration
Gain Drift vs. Temperature
1
±2.5 ppm of FS/°C
Positive Full-Scale Error
3
±0.2 % of FSR Before calibration
Positive Full-Scale Drift vs. Temp.
1
±2.5 ppm of FS/°C
Bipolar Negative Full-Scale Error
4
±0.0030 % of FSR After calibration
Common-Mode Rejection 80 95 dB At dc, AIN = 1 V
Power Supply Rejection 70 80 dB At dc, AIN = 1 V
ADC PERFORMANCE, CHOPPING
DISABLED
Conversion Time Rate 737 15133 Hz Configure via conv. time register
No Missing Codes
1, 2
24 Bits
FW 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 mV Before calibration
Offset Drift vs. Temperature ±1.5 μV/°C
Gain Error
3
±0.2 % Before calibration
Gain Drift vs. Temperature ±2.5 ppm of FS/°C
Positive Full-Scale Error
3
±0.2 % of FSR Before calibration
Positive Full-Scale Drift vs. Temp. ±2.5 ppm of FS/°C
Bipolar Negative Full-Scale Error
4
±0.0030 % of FSR After calibration
Common-Mode Rejection 75 dB At dc, AIN = 1 V
Power Supply Rejection 65 dB At dc, AIN = 1 V
ANALOG INPUTS
Analog Input Voltage
1, 6
±2.5 V Range ±2.5 V
2.5 V Range 0 to 2.5 V
±1.25 V Range ±1.25 V
1.25 V Range 0 to 1.25 V
±0.625 V Range ±0.625 V
0.625 V Range 0 to 0.625 V
AIN, AINCOM Common-Mode/
Absolute Voltage
1
0.2 AV
DD
− 0.3 V
Analog Input Slew Rate
1, 7
0.5 V/conv. time AIN absolute voltage > 3 V
AIN, AINCOM Input Current
1, 8
1 5 nA Only one channel, chop disabled