Datasheet
AD7822/AD7825/AD7829
Rev. C | Page 3 of 28
SPECIFICATIONS
V
DD
= 3 V ± 10%, V
DD
= 5 V ± 10%, GND = 0 V, V
REF IN/OUT
= 2.5 V. All specifications −40°C to +85°C, unless otherwise noted.
Table 1.
Parameter Version B Unit Test Condition/Comment
DYNAMIC PERFORMANCE f
IN
= 30 kHz, f
SAMPLE
= 2 MHz
Signal to (Noise + Distortion) Ratio
1
48 dB min
Total Harmonic Distortion
1
−55 dB max
Peak Harmonic or Spurious Noise
1
−55 dB max
Intermodulation Distortion
1
fa = 27.3 kHz, fb = 28.3 kHz
Second-Order Terms −65 dB typ
Third-Order Terms −65 dB typ
Channel-to-Channel Isolation
1
−70 dB typ f
IN
= 20 kHz
DC ACCURACY
Resolution 8 Bits
Minimum Resolution for Which
No Missing Codes Are Guaranteed 8 Bits
Integral Nonlinearity (INL)
1
±0.75 LSB max
Differential Nonlinearity (DNL)
1
±0.75 LSB max
Gain Error
1
±2 LSB max
Gain Error Match
1
±0.1 LSB typ
Offset Error
1
±1 LSB max
Offset Error Match
1
±0.1 LSB typ
ANALOG INPUTS
2
See Analog Input section
V
DD
= 5 V ± 10% Input voltage span = 2.5 V
V
IN1
to V
IN8
Input Voltage V
DD
V max
0 V min
V
MID
Input Voltage V
DD
− 1.25 V max Default V
MID
= 1.25 V
1.25 V min
V
DD
= 3 V ± 10% Input voltage span = 2 V
V
IN1
to V
IN8
Input Voltage V
DD
V max
0 V min
V
MID
Input Voltage V
DD
− 1 V max Default V
MID
= 1 V
1 V min
V
IN
Input Leakage Current ±1 µA max
V
IN
Input Capacitance 15 pF max
V
MID
Input Impedance 6 kΩ typ
REFERENCE INPUT
V
REF IN/OUT
Input Voltage Range 2.55 V max 2.5 V + 2%
2.45 V min 2.5 V − 2%
Input Current 1 A typ
100 A max
ON-CHIP REFERENCE Nominal 2.5 V
Reference Error ±50 mV max
Temperature Coefficient 50 ppm/°C typ
LOGIC INPUTS
Input High Voltage, V
INH
2.4 V min V
DD
= 5 V ± 10%
Input Low Voltage, V
INL
0.8 V max V
DD
= 5 V ± 10%
Input High Voltage, V
INH
2 V min V
DD
= 3 V ± 10%
Input Low Voltage, V
INL
0.4 V max V
DD
= 3 V ± 10%
Input Current, I
IN
±1 A max 10 nA typical, V
IN
= 0 V to V
DD
Input Capacitance, C
IN
10 pF max