AD7709ARU Datasheet, PDF (3/32 Pages) Analog Devices – 16-Bit
- ADC with Switchable Current Sources

AD7709
SPECIFICATIONS1 (VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; XTAL1/XTAL2 =
32.768 kHz Crystal; all specifications T_MIN to T_MAX, unless otherwise noted.)
Parameter
AD7709A, AD7709B Unit
Test Conditions
ADC CHANNEL SPECIFICATION
Output Update Rate
5.4
105
Hz min
Hz max
0.732 ms Increments
ADC CHANNEL
No Missing Codes²
Resolution
Output Noise and Update Rates
Integral Nonlinearity²
Offset Error
Offset Error Drift vs. Temperature
Full-Scale Error³
Gain Drift vs. Temperature
Power Supply Rejection (PSR)
16
13
16
See Tables II to V
± 30
±3
± 10
± 0.75
± 0.2
± 0.5
85
ANALOG INPUTS
Differential Input Voltage Ranges
±1.024 ¥ REFIN
GAIN
ADC Range Matching
Absolute AIN1–AIN4 Voltage Limits²
AIN1–AIN4 Analog Input Current
DC Input Current²
DC Input Current Drift
Absolute AINCOM Voltage Limits²
AINCOM Analog Input Current
DC Input Current
DC Input Current Drift
Normal-Mode Rejection^{2, 4}
@ 50 Hz
@ 60 Hz
Common-Mode Rejection
@ DC
±2
GND + 100 mV
V_DD – 100 mV
±1
±5
GND – 30 mV
V_DD + 30 mV
± 125
±2
100
100
100
@ 50 Hz²
@ 60 Hz²
REFERENCE INPUTS
(REFIN1 and REFIN2)
REFIN Voltage
REFIN Voltage Range²
Absolute REFIN Voltage Limits²
Average Reference Input Current
Average Reference Input Current Drift
Normal-Mode Rejection^{2, 4}
@ 50 Hz
@ 60 Hz
Common-Mode Rejection
@ DC
@ 50 Hz
@ 60 Hz
See Notes on page 5.
100
100
2.5
1
V_DD
GND – 30 mV
V_DD + 30 mV
0.5
± 0.01
100
100
110
110
110
Bits min
Bits p-p
Bits p-p
ppm of FSR max
mV typ
nV/∞C typ
LSB typ
% of FS typ
ppm/∞C typ
dB typ
20 Hz Update Rate
± 20 mV Range, 20 Hz Update Rate
± 2.56 V Range, 20 Hz Update Rate
Typically 2 ppm
FSR =
2 ¥ 1.024 REFIN
GAIN
B Grade, V_DD = 4 V
A Grade
Input Range = ± 2.56 V
100 dB typ on ± 20 mV Range
V nom
mV typ
V min
V max
nA max
pA /∞C typ
V min
V max
nA/V typ
pA/V/∞C typ
dB min
dB min
dB typ
dB min
dB min
REFIN = REFIN(+) – REFIN(–)
GAIN = 1 to 128
Input Voltage = 19 mV on All Ranges
Pseudo-Differential Mode of Operation
Input Current Varies with Input Range
50 Hz ± 1 Hz, 16.65 Hz Update Rate, SF = 82
60 Hz ± 1 Hz, 20 Hz Update Rate, SF = 68
Input Range = ± 2.56 V, AIN = 1 V
110 dB typ on ± 20 mV Range
50 Hz ± 1 Hz, Range = ± 2.56 V, AIN = 1 V
60 Hz ± 1 Hz, Range = ± 2.56 V, AIN = 1 V
V nom
V min
V max
V min
V max
mA/V typ
nA/V/∞C typ
dB min
dB min
dB typ
dB typ
dB typ
REFIN = REFIN(+) – REFIN(–)
50 Hz ± 1 Hz, SF = 82
60 Hz ± 1 Hz, SF = 68
Input Range = ± 2.56 V, AIN = 1 V
50 Hz ± 1 Hz, Range = 2.56 V, AIN = 1 V
60 Hz ± 1 Hz, Range = 2.56 V, AIN = 1 V
REV. A
–3–