Datasheet

AD7707
Rev. B | Page 5 of 52
Parameter B Version
1
Unit Conditions/Comments
Common-Mode 60 Hz Rejection
2
150 dB typ For filter notches of 10 Hz, 20 Hz, 60 Hz, ±0.02 × f
NOTCH
Absolute/Common-Mode REF IN Voltage
2
AGND to AV
DD
V min to V max
Absolute/Common-Mode AIN Voltage
2, 10
AGND – 100 mV V min BUF bit of setup register = 0
AV
DD
+ 30 mV V max
AGND + 50 mV V min BUF bit of setup register = 1
AV
DD
− 1.5 V V max
AIN DC Input Current
2
1 nA max
AIN Sampling Capacitance
2
10 pF max BUF = 0
AIN Differential Voltage Range
11, 12
0 to +V
REF
/gain V nom
Unipolar input range (
B/U bit of setup register = 1)
±V
REF
/gain V nom
Bipolar input range (
B/U bit of setup register = 0)
AIN Input Sampling Rate, f
S
Gain × f
CLKIN
/64 Hz nom 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/max AV
DD
= 2.7 V to 3.3 V; V
REF
= 1.225 V ± 1% for
specified performance
REF IN(+) − REF IN(−) Voltage 1/3.5 V min/max AV
DD
= 4.75 V to 5.25 V; V
REF
= 2.5 V ± 1% for
specified performance
REF IN Input Sampling Rate, f
S
f
CLKIN
/64
±100 mV INPUT RANGE Low level input channels, AIN1 and AIN2; gain = 16,
unbuffered mode
INL
2
±0.003 % of FSR max Filter notch < 60 Hz
Input Common-Mode Rejection (CMR)
2
80 dB typ
Power Supply Rejection (PSR)
2
90 dB typ
HIGH LEVEL ANALOG INPUT CHANNEL (AIN3) AIN3 is with respect to HICOM
AIN3 Voltage Range +10 V max
−10 V min
Normal Mode 50 Hz Rejection 78 dB typ For filter notches of 10 Hz, 25 Hz, 50 Hz; ±0.02 × f
NOTCH
Normal Mode 60 Hz Rejection 78 dB typ For filter notches of 10 Hz, 20 Hz, 60 Hz; ±0.02 × f
NOTCH
AIN3 Input Sampling Rate, f
S
Gain × f
CLKIN
/64 Hz nom For gains of 1 to 4
f
CLKIN
/8 Hz nom For gains of 8 to 128
AIN3 Input Impedance
2
27 kΩ min Typically 30 kΩ ± 10%; typical resistor
Tempco is −30 ppm/°C
AIN3 Sampling Capacitance
2
10 pF max
VBIAS Input Range 0 V/AV
DD
V min/max Typically REFIN(+) = 2.5 V
LOGIC INPUTS
Input Current
All Inputs Except MCLK IN ±1 μA max Typically ±20 nA
MCLK ±10 μA max Typically ±2 m A
All Inputs Except SCLK and MCLK IN
V
INL
, Input Low Voltage 0.8 V max DV
DD
= 5 V
0.4 V max DV
DD
= 3 V
V
INH
, Input High Voltage 2.0 V max DV
DD
= 3 V and 5 V
SCLK Only (Schmitt Triggered Input) DV
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) DV
DD
= 3 V nominal
V
T+
1/2.5 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