Datasheet

AD7765
Rev. A | Page 4 of 32
Parameter Test Conditions/Comments Specification Unit
DC ACCURACY
Resolution Guaranteed monotonic to 24 bits 24 Bits
Integral Nonlinearity
Normal power mode 0.0036 % typ
Low power mode 0.0014 % typ
Zero Error
Normal power mode 0.006 % typ
0.03 % max
Including on-chip amplifier 0.04 % typ
Low power mode 0.002 % typ
0.024 % max
Gain Error
0.018 % typ
Including on-chip amplifier 0.04 % typ
Zero Error Drift
0.00006 %FS/°C typ
Gain Error Drift
0.00005 %FS/°C typ
DIGITAL FILTER CHARACTERISTICS
Pass-Band Ripple 0.1 dB typ
Pass Band
3
−1 dB frequency ODR × 0.4016 kHz
−3 dB Bandwidth
3
ODR × 0.4096 kHz
Stop Band
3
Beginning of stop band ODR × 0.5 kHz
Stop-Band Attenuation Decimate 128× 120 dB typ
Decimate 256× 115
Group Delay
Decimate 128× MCLK = 40 MHz 177 µs typ
Decimate 256× MCLK = 40 MHz 358 µs typ
ANALOG INPUT
Differential Input Voltage Modulator input pins: V
IN
+ − V
IN
−, V
REF
+ = 4.096 V ±3.2768 V p-p
Input Capacitance At on-chip differential amplifier inputs 5 pF typ
At modulator inputs 29 pF typ
REFERENCE INPUT/OUTPUT
V
REF+
Input Voltage AV
DD
3 = 5 V ± 5% 4.096 V
V
REF+
Input DC Leakage Current ±1 µA max
V
REF+
Input Capacitance 5 pF typ
DIGITAL INPUT/OUTPUT
MCLK Input Amplitude 2.25 to 5.25 V
Input Capacitance 7.3 pF typ
Input Leakage Current ±1 μA/pin max
V
INH
0.8 × DV
DD
V min
V
INL
0.2 × DV
DD
V max
V
OH
4
2.2 V min
V
OL
0.1 V max
ON-CHIP DIFFERENTIAL AMPLIFIER
Input Impedance >1 MΩ
Bandwidth for 0.1 dB Flatness 125 kHz
Common-Mode Input Voltage Voltage range at input pins: V
IN
A− and V
IN
A+ −0.5 to +2.2 V
Common-Mode Output Voltage On-chip differential amplifier pins: V
OUT
A+ and V
OUT
A− 2.048 V
POWER REQUIREMENTS
AV
DD
1 (Modulator Supply) ±5% 2.5 V
AV
DD
2 (General Supply) ±5% 5 V
AV
DD
3 (Differential Amplifier Supply) ±5% 5 V min/max
AV
DD
4 (Reference Buffer Supply) ±5% 5 V min/max
DV
DD
±5% 2.5 V