Datasheet
REV. A
AD7719
–4–
Parameter AD7719B Unit Test Conditions
AUXILIARY CHANNEL (continued)
Offset Error
3
±3 µV typ Selected Channel = AIN5/AIN6
Offset Error Drift vs. Temperature
4
±10 nV/°C typ
Full-Scale Error
6, 7
±0.75 LSB typ
Gain Drift vs. Temperature
4
0.5 ppm/°C typ
Negative Full-Scale Error ±1 LSB typ
Power Supply Rejection (PSR) 70 dB min AIN
= 1 V Input Range = ±2.5 V, Typically 80 dB
ANALOG INPUTS
Differential Input Voltage Ranges ±REFIN2 V nom ARN = 1
±REFIN2/2 V nom ARN = 0
Absolute AIN Voltage Limits AGND – 30 mV V min Unbuffered Input
AV
DD
+ 30 mV V max
Analog Input Current
DC Input Current ±125 nA/V typ Input Current Varies with Input Voltage
DC Input Current Drift ±2 pA/V/°C typ
Normal-Mode Rejection
2, 8
@ 50 Hz 100 dB min 50 Hz ±1 Hz, SF = 82
@ 60 Hz 100 dB min 60 Hz ±1 Hz, SF = 68
Common-Mode Rejection
@ DC 85 dB min Input Range = ±2.5 V, AIN = 1 V
@ 50 Hz
2
90 dB min 50 Hz ±1 Hz, Range = 2.5 V, AIN = 1 V
@ 60 Hz
2
90 dB min 60 Hz ±1 Hz, Range = 2.5 V, AIN = 1 V
REFERENCE INPUT (REFIN2) With Respect to AGND
REFIN2 Voltage 2.5 V nom
REFIN2 Range
2
1V min
AV
DD
V max
Reference DC Input Current
2
0.2 µA/V typ
Reference DC Input Current Drift 0.003 nA/V/°C typ
EXCITATION CURRENT SOURCES
(IEXC1 and IEXC2)
Output Current 200 µA nom
Initial Tolerance at 25°C ±10 % typ
Drift 200 ppm/°C typ
Initial Current Matching at 25°C±1% typ Matching between IEXC1 and IEXC2
No Load
Drift Matching 20 ppm/°C typ
Line Regulation (AV
DD
) 2.1 µA/V max AV
DD
= 5 V ± 5%. Typically 1.25 µA/V
Load Regulation 300 nA/V typ
Output Compliance AVDD – 0.6 V max
AGND – 30 mV V min
LOW-SIDE POWER SWITCHES
(SW1, SW2)
R
ON
5 Ω max AV
DD
= 5 V. Typically 3 Ω
7 Ω max AV
DD
= 3 V. Typically 4.5 Ω
Allowable Current
2
20 mA max Continuous Current per Switch
TEMPERATURE SENSOR
Accuracy See TPC 5 °C typ
TRANSDUCER BURNOUT
AIN(+) Current –100 nA typ
AIN(–) Current 100 nA typ
Initial Tolerance @ 25°C ±15 % typ
Drift 0.03 %/°C typ
SYSTEM CALIBRATION
2, 9
Full-Scale Calibration Limit 1.05 × FS
10
V max
Zero-Scale Calibration Limit –1.05 × FS V min
Input Span 0.8 × FS V min
2.1 × FS V max