AD7887
Rev. D | Page 3 of 24
SPECIFICATIONS
VDD = 2.7 V to 5.25 V, VREF = 2.5 V, external/internal reference unless otherwise noted, fSCLK = 2 MHz, TA = TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
Unit
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to Noise + Distortion Ratio (SNR
)2, 371
dB typ
fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS
Total Harmonic Distortion (T
HD)280
dB typ
fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS
Peak Harmonic or Spurious
Noise2–80
80
dB typ
fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS
Intermodulation Distortion
(IMD)2Second-Order Terms
80
dB typ
fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS
Third-Order Terms
80
dB typ
fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS
Channel-to-Channel Isolat
ion280
dB typ
fIN = 25 kHz
Full-Power Bandwidth
2.5
MHz typ
@ 3 dB
DC ACCURACY
Any channel
Resolution
12
Bits
±2
±1
LSB max
Differential Nonlineari
ty2±2
±1
LSB max
Guaranteed no missing codes to 11 bits (A Grade)
±3
LSB max
VDD = 5 V, dual-channel mode
±4
LSB max
VDD = 3 V, dual-channel mode
±6
LSB typ
Single-channel mode
0.5
LSB max
±2
LSB max
Dual-channel mode
±1
LSB max
Single-channel mode, external reference
±6
LSB typ
Single-channel mode, internal reference
2
LSB max
ANALOG INPUT
Input Voltage Ranges
0 to VREF
V
Leakage Current
±5
μA max
Input Capacitance
20
pF typ
REFERENCE INPUT/OUTPUT
REFIN Input Voltage Range
2.5/VDD
V min/max
Functional from 1.2 V
Input Impedance
10
kΩ typ
Very high impedance if internal reference disabled
REFOUT Output Voltage
2.45/2.55
V min/max
REFOUT Temperature Coefficient
±50
ppm/°C typ
LOGIC INPUTS
Input High Voltage, VINH
2.4
V min
VDD = 4.75 V to 5.25 V
2.1
V min
VDD = 2.7 V to 3.6 V
Input Low Voltage, VINL
0.8
V max
VDD = 2.7 V to 5.25 V
Input Current, IIN
±1
μA max
Typically 10 nA, VIN = 0 V or VDD
10
pF max
LOGIC OUTPUTS
Output High Voltage, VOH
ISOURCE = 200 μA
VDD 0.5
V min
VDD = 2.7 V to 5.25 V
Output Low Voltage, VOL
0.4
V max
ISINK = 200 μA
Floating-State Leakage Current
±1
μA max
Floating-State Output Capacitanc
e510
pF max
Output Coding
Straight (Natural) Binary