Datasheet
AD7195
Rev. 0 | Page 4 of 44
Parameter Min Typ Max Unit Test Conditions/Comments
1
External Clock
@ 50 Hz, 60 Hz 100 dB 10 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz
67 dB 50 Hz output data rate, REJ60
6
= 1, 50 ± 1 Hz, 60 ± 1 Hz
@ 50 Hz 95 dB 50 Hz output data rate, 50 ± 1 Hz
@ 60 Hz 95 dB 60 Hz output data rate, 60 ± 1 Hz
ANALOG INPUTS
Differential Input Voltage
Ranges
±V
REF
/gain V VREF = REFIN(+) − REFIN(−), gain = 1 to 128
−(AV
DD
−
1.25 V)/gain
+(AV
DD
−
1.25 V)/gain
V Gain > 1
Absolute AIN Voltage Limits
2
Unbuffered Mode AGND − 0.05 AV
DD
+ 0.05 V
Buffered Mode AGND + 0.25 AV
DD
− 0.25 V
Analog Input Current
Buffered Mode
Input Current
2
−2 +2 nA Gain = 1
−4.5 +4.5 nA Gain > 1
Input Current Drift ±5 pA/°C
Unbuffered Mode
Input Current ±5 μA/V Gain = 1, input current varies with input voltage
±1 μA/V Gain > 1
Input Current Drift ±0.05 nA/V/°C External clock
±1.6 nA/V/°C Internal clock
REFERENCE INPUT
REFIN Voltage 1 AV
DD
AV
DD
V REFIN = REFIN(+) − REFIN(−). The differential input must
be limited to ±(AV
DD
− 1.25 V)/gain when gain > 1
Absolute REFIN Voltage
Limits
2
GND − 0.05 AV
DD
+ 0.05 V
Average Reference Input
Current
7 μA/V
Average Reference Input
Current Drift
±0.03 nA/V/°C External clock
±1.3 nA/V/°C Internal clock
Normal Mode Rejection
2
Same as for
analog inputs
Common-Mode Rejection 95 dB
Reference Detect Levels 0.3 0.6 V
TEMPERATURE SENSOR
Accuracy ±2 °C Applies after user calibration at 25°C
Sensitivity 2815 Codes/°C Bipolar mode
BRIDGE POWER-DOWN SWITCH
R
ON
10 Ω
Allowable Current
2
30 mA Continuous current
BURNOUT CURRENTS
AIN Current 500 nA Analog inputs must be buffered and chop disabled
DIGITAL OUTPUTS (ACXx,
ACXx
)
Output High Voltage, V
OH
2
4 V AV
DD
= 5 V, I
SOURCE
= 200 μA
Output Low Voltage, V
OL
2
0.4 V AV
DD
= 5 V, I
SINK
= 800 μA
INTERNAL/EXTERNAL CLOCK
Internal Clock
Frequency 4.72 5.12 MHz
Duty Cycle 50:50 %
External Clock/Crystal
2
Frequency 2.4576 4.9152 5.12 MHz
Input Low Voltage V
INL
0.8 V DV
DD
= 5 V
0.4 V DV
DD
= 3 V
Input High Voltage, V
INH
2.5 V DV
DD
= 3 V
3.5 V DV
DD
= 5 V
Input Current −10 +10 μA