Datasheet

AD7705/AD7706
Rev. C | Page 6 of 44
Parameter B Version
1
Unit Conditions/Comments
AIN Input Sampling Rate, f
S
Gain × f
CLKIN
/64 For gains of 1 to 4
f
CLKIN
/8 For gains of 8 to 128
Reference Input Range
REF IN(+) − REF IN(−) Voltage 1/1.75 V min/V max
V
DD
= 2.7 V to 3.3 V
V
REF
= 1.225 ± 1% for specified performance
REF IN(+) − REF IN(−) Voltage 1/3.5 V min/V max
V
DD
= 4.75 V to 5.25 V
V
REF
= 2.5 ± 1% for specified performance
REF IN Input Sampling Rate, f
S
f
CLKIN
/64
LOGIC INPUTS
Input Current
All Inputs, Except MCLK IN ±1 μA max Typically ±20 nA
MCLK IN ±10 μA max Typically ±2 μA
All Inputs, Except SCLK and MCLK IN
Input Low Voltage, V
INL
0.8 V max V
DD
= 5 V
0.4 V max V
DD
= 3 V
Input High Voltage, V
INH
2.0 V min V
DD
= 3 V and 5 V
SCLK Only (Schmitt-Triggered Input) V
DD
= 5 V nominal
V
T+
1.4/3 V min/V max
V
T−
0.8/1.4 V min/V max
V
T+
− V
T−
0.4/0.8 V min/V max
SCLK Only (Schmitt-Triggered Input) V
DD
= 3 V nominal
V
T+
1/2 V min/V max
V
T−
0.4/1.1 V min/V max
V
T+
− V
T−
0.375/0.8 V min/V max
MCLK IN Only V
DD
= 5 V nominal
Input Low Voltage, V
INL
0.8 V max
Input High Voltage, V
INH
3.5 V min
MCLK IN Only V
DD
= 3 V nominal
Input Low Voltage, V
INL
0.4 V max
Input High Voltage, V
INH
2.5 V min
LOGIC OUTPUTS (Including MCLK OUT)
Output Low Voltage, V
OL
0.4 V max I
SINK
= 800 μA, except for MCLK OUT;
13
V
DD
= 5 V
Output Low Voltage, V
OL
0.4 V max I
SINK
= 100 μA, except for MCLK OUT;
13
V
DD
= 3 V
Output High Voltage, V
OH
4 V min I
SOURCE
= 200 μA, except for MCLK OUT;
13
V
DD
= 5 V
Output High Voltage, V
OH
V
DD
− 0.6 V min I
SOURCE
= 100 μA, except for MCLK OUT;
13
V
DD
= 3 V
Floating State Leakage Current ±10 μA max
Floating State Output Capacitance
14
9 pF typ
Data Output Coding Binary Unipolar mode
Offset binary Bipolar mode
SYSTEM CALIBRATION
Positive Full-Scale Limit
15
(1.05 × V
REF
)/gain V max Gain is the selected PGA gain (1 to 128)
Negative Full-Scale Limit
15
−(1.05 × V
REF
)/gain V max Gain is the selected PGA gain (1 to 128)
Offset Limit
15
−(1.05 × V
REF
)/gain V max Gain is the selected PGA gain (1 to 128)
Input Span
16
(0.8 × V
REF
)/gain V min Gain is the selected PGA gain (1 to 128)
(2.1 × V
REF
)/gain V max Gain is the selected PGA gain (1 to 128)