Data Sheet AD7170
Rev. B | Page 3 of 14
SPECIFICATIONS
V
DD
= 2.7 V to 5.25 V, V
REF
= V
DD
, GND = 0 V, all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
AD7170B
1
Unit Test Conditions/Comments
Min Typ Max
ADC CHANNEL
Output Data Rate (f
ADC
) 125 Hz Settling time = 3/f
ADC
No Missing Codes
2
12 Bits
Noise Free Resolution 12 Bits V
INx
= 0 V, V
REF
= V
DD
Resolution Peak-to-Peak (p-p) 12 Bits V
INx
= 0 V, V
REF
= V
DD
Effective Resolution (ENOB) 12 Bits V
INx
= 0 V, V
REF
= V
DD
RMS Noise See Table 6 μV V
INx
= 0 V, V
REF
= V
DD
Integral Nonlinearity ±0.1 LSB
Offset Error ±200
µV
Offset Error Drift vs. Temperature
Full-Scale Error ±0.015 % of FS
Gain Drift vs. Temperature ±0.07 LSB/°C
Power Supply Rejection 85 dB V
INx
= 1 V
ANALOG INPUTS
Differential Input Voltage Range ±V
REF
V V
REF
= REFIN(+) − REFIN(−)
Absolute AINx Voltage Limits
2
GND − 0.03 V
DD
+ 0.03 V
Average Input Current
2
±400 nA/V Input current varies with input
voltage
Average Input Current Drift
DC Common-Mode Rejection 90 dB V
INx
= 1 V
External REFIN Voltage V
DD
V REFIN = REFIN(+) − REFIN(−)
Reference Voltage Range
2
0.5 V
DD
V
Absolute REFIN Voltage Limits
2
GND − 0.03 V
DD
+ 0.03 V
Average Reference Input Current 400 nA/V
Average Reference Input Current
Drift
±0.15 nA/V/°C
DC Common-Mode Rejection 110 dB
INTERNAL CLOCK
Frequency
2
64 − 5% 64 + 5% kHz
LOGIC INPUTS
SCLK,
PDRST
2
Input Low Voltage, V
INL
0.4 V V
DD
= 3 V
0.8 V V
DD
= 5 V
Input High Voltage, V
INH
1.8 V V
DD
= 3 V
2.4 V V
DD
= 5 V
SCLK (Schmitt-Triggered Input)
2
Hysteresis 100 mV V
DD
= 3 V
140 mV V
DD
= 5 V
Input Currents ±2 µA V
IN
= V
DD
or GND
Input Capacitance 5 pF All digital inputs