
AD7457
Rev. A | Page 3 of 20
SPECIFICATIONS
VDD = 2.7 V to 5.25 V, fSCLK = 10 MHz, fS = 100 kSPS, VREF = 2.5 V, TA = TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
Test Conditions/Comments
Unit
DYNAMIC PERFORMANCE
fIN = 30 kHz
Signal to Noise Ratio (SNR
)271
dB min
Signal to (Noise + Distortion) (S
INAD)270
dB min
Total Harmonic Distortion (T
HD)284 dB typ
75
dB max
Peak Harmonic or Spurious
Noise286 dB typ
75
dB max
Intermodulation Distortion
(IMD)2fa = 25 kHz; fb = 35 kHz
Second-Order Terms
80
dB typ
Third-Order Terms
80
dB typ
5
ns typ
50
ps typ
@ 3 dB
20
MHz typ
@ 0.1 dB
2.5
MHz typ
DC ACCURACY
Resolution
12
Bits
Integral Nonlinearity (INL
)2±1
LSB max
Differential Nonlinearity
(DNL)2Guaranteed no missed codes to 12 bits
±0.95
LSB max
±4.5
LSB max
±2
LSB max
ANALOG INPUT
Full-Scale Input Span
VIN+ VIN
VREF
V
Absolute Input Voltage
VIN+
VREF
V
VDD = 2.7 V to 3.6 V
0.1 to +0.4
V
VDD = 4.75 V to 5.25 V
0.1 to +1.5
V
DC Leakage Current
±1
A max
Input Capacitance
When in track/hold
30/10
pF typ
REFERENCE INPUT
±1% tolerance for specified performance
2.5
V
DC Leakage Current
±1
A max
VREF Input Capacitance
When in track/hold
10/30
pF typ
LOGIC INPUTS
Input High Voltage, VINH
2.4
V min
Input Low Voltage, VINL
0.8
V max
Input Current, IIN
Typically 10 nA, VIN = 0 V or VDD
±1
A max
10
pF max
LOGIC OUTPUTS
Output High Voltage, VOH
VDD = 4.75 V to 5.25 V, ISOURCE = 200 A
2.8
V min
VDD = 2.7 V to 3.6 V, ISOURCE = 200 A
2.4
V min
Output Low Voltage, VOL
ISINK = 200 A
0.4
V max
Floating-State Leakage Current
±1
A max
10
pF max
Output Coding
Straight natural binary
CONVERSION RATE
Conversion Time
1.6 s with a 10 MHz SCLK
16
SCLK cycles
Track-and-Hold Acquisition Tim
e21
s max
Throughput Rate
100
kSPS max