AD7705/AD7706
Parameter
B Version1
Gain ꢀ fCLKIN/64
fCLKIN/8
Unit
Conditions/Comments
For gains of 1 to 4
For gains of 8 to 128
AIN Input Sampling Rate, fS
Reference Input Range
REF IN(+) − REF IN(−) Voltage
1/1.75
1/3.5
V min/V max
V min/V max
VDD = 2.7 V to 3.3 V
VREF = 1.225 1% for specified performance
VDD = 4.75 V to 5.25 V
REF IN(+) − REF IN(−) Voltage
V
REF = 2.5 1% for specified performance
REF IN Input Sampling Rate, fS
LOGIC INPUTS
fCLKIN/64
Input Current
All Inputs, Except MCLK IN
MCLK IN
1
10
μA max
μA max
Typically 20 nA
Typically 2 μA
All Inputs, Except SCLK and MCLK IN
Input Low Voltage, VINL
0.8
0.4
2.0
V max
V max
V min
VDD = 5 V
VDD = 3 V
VDD = 3 V and 5 V
VDD = 5 V nominal
Input High Voltage, VINH
SCLK Only (Schmitt-Triggered Input)
VT+
VT−
VT+ − VT−
1.4/3
0.8/1.4
0.4/0.8
V min/V max
V min/V max
V min/V max
SCLK Only (Schmitt-Triggered Input)
VT+
VT−
VDD = 3 V nominal
1/2
0.4/1.1
0.375/0.8
V min/V max
V min/V max
V min/V max
VT+ − VT−
MCLK IN Only
VDD = 5 V nominal
VDD = 3 V nominal
Input Low Voltage, VINL
Input High Voltage, VINH
MCLK IN Only
0.8
3.5
V max
V min
Input Low Voltage, VINL
Input High Voltage, VINH
LOGIC OUTPUTS (Including MCLK OUT)
Output Low Voltage, VOL
Output Low Voltage, VOL
Output High Voltage, VOH
Output High Voltage, VOH
Floating State Leakage Current
Floating State Output Capacitance14
Data Output Coding
0.4
2.5
V max
V min
0.4
0.4
4
VDD − 0.6
10
9
V max
V max
V min
V min
μA max
pF typ
ISINK = 800 μA, except for MCLK OUT;13 VDD = 5 V
ISINK = 100 μA, except for MCLK OUT;13 VDD = 3 V
ISOURCE = 200 μA, except for MCLK OUT;13 VDD = 5 V
ISOURCE = 100 μA, except for MCLK OUT;13 VDD = 3 V
Binary
Offset binary
Unipolar mode
Bipolar mode
SYSTEM CALIBRATION
Positive Full-Scale Limit15
Negative Full-Scale Limit15
Offset Limit15
(1.05 ꢀ VREF)/gain
−(1.05 ꢀ VREF)/gain
−(1.05 ꢀ VREF)/gain
(0.8 ꢀ VREF)/gain
(2.1 ꢀ VREF)/gain
V max
V max
V max
V min
V max
Gain is the selected PGA gain (1 to 128)
Gain is the selected PGA gain (1 to 128)
Gain is the selected PGA gain (1 to 128)
Gain is the selected PGA gain (1 to 128)
Gain is the selected PGA gain (1 to 128)
Input Span16
Rev. C | Page 6 of 44