Data Sheet
AD7656/AD7657/AD7658
Rev. D | Page 5 of 32
AD7657
VREF = 2.5 V internal/external, AVCC = 4.75 V to 5.25 V, DVCC = 4.75 V to 5.25 V, VDRIVE = 2.7 V to 5.25 V;
For ±4 × VREF range: VDD = 10 V to 16.5 V, VSS = 10 V to 16.5 V; For ±2 × VREF range: VDD = 5 V to 16.5 V, VSS = 5 V to 16.5 V;
fSAMPLE = 250 kSPS, TA = TMIN to TMAX, unless otherwise noted.1 Table 2.
Parameter
Unit
Test Conditions/Comments
DYNAMIC PERFORMANCE
fIN = 50 kHz sine wave
Signal-to-Noise + Distortion (SINAD
)281.5
dB min
Signal-to-Noise Ratio (S
NR)282.5
dB min
83.5
dB typ
Total Harmonic Distortion (TH
D)290
89
dB max
92
dB typ
Peak Harmonic or Spurious Noise (SFD
R)2100
dB typ
Intermodulation Distortion (IMD
)2fa = 50 kHz, fb = 49 kHz
Second-Order Terms
109
dB typ
Third-Order Terms
104
dB typ
Aperture Delay
10
ns max
Aperture Delay Matching
4
ns max
Aperture Jitter
35
ps typ
Channel-to-Channel Isolati
on2100
dB typ
fIN on unselected channels up to 100 kHz
Full Power Bandwidth
12
MHz typ
@ 3 dB
2
MHz typ
@ 0.1 dB
DC ACCURACY
Resolution
14
Bits
No Missing Codes
14
Bits min
±1.5
LSB max
±1
LSB typ
Positive Full-Scale Err
or2±0.75
% FSR max
±0.183% FSR typical
Positive Full-Scale Error Matchin
g2±0.3
% FSR max
Bipolar Zero-Scale Erro
r2±0.0305
% FSR max
±0.015 % FSR typical
Bipolar Zero-Scale Error Matchin
g2±0.0427
% FSR max
Negative Full-Scale E
rror2±0.75
% FSR max
±0.183% FSR typical
Negative Full-Scale Error Matchin
g2±0.3
% FSR max
ANALOG INPUT
Input Voltage Ranges
±4 × VREF
V
RNG bit/RANGE pin = 0
±2 × VREF
V
RNG bit/RANGE pin = 1
DC Leakage Current
±1
A max
10
pF typ
±4 × VREF range when in track
14
pF typ
±2 × VREF range when in track
REFERENCE INPUT/OUTPUT
Reference Input Voltage Range
2.5/3
V min/max
DC Leakage Current
±1
A max
18.5
pF typ
REFEN/DIS = 1
Reference Output Voltage
2.49/2.51
V min/max
Long-Term Stability
150
ppm typ
1,000 hours
Reference Temperature Coefficient
25
ppm/°C max
6
ppm/°C typ
LOGIC INPUTS
Input High Voltage (VINH)
0.7 × VDRIVE
V min
Input Low Voltage (VINL)
0.3 × VDRIVE
V max
Input Current (IIN)
±1
A max
Typically 10 nA, VIN = 0 V or VDRIVE
Input Capacitance (CIN)3
10
pF max