Datasheet

Data Sheet AD7490
Rev. D | Page 3 of 28
SPECIFICATIONS
V
DD
= V
DRIVE
= 2.7 V to 5.25 V, REF
IN
= 2.5 V, f
SCLK
1
= 20 MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Temperature range (B Version):
−40°C to +85°C.
Table 1.
Parameter Test Conditions/Comments Min Typ Max Unit
DYNAMIC PERFORMANCE
f
IN
= 50 kHz sine wave, f
SCLK
= 20 MHz
Signal-to-(Noise + Distortion) (SINAD)
2
V
DD
= 5 V 69 70.5 dB
V
DD
= 3 V 68 69.5 dB
Signal-to-Noise Ratio (SNR)
2
69.5 dB
Total Harmonic Distortion (THD)
2
V
DD
= 5 V −84 −74 dB
V
DD
= 3 V −77 −71 dB
Peak Harmonic or Spurious Noise (SFDR)
2
V
DD
= 5 V −86 −75 dB
V
DD
= 3 V −80 −73 dB
Intermodulation Distortion (IMD)
2
fa = 40.1 kHz, fb = 41.5 kHz
Second-Order Terms −85 dB
Third-Order Terms −85 dB
Aperture Delay
10
ns
Aperture Jitter 50 ps
Channel-to-Channel Isolation
2
f
IN
= 400 kHz −82 dB
Full Power Bandwidth 3 dB 8.2 MHz
0.1 dB 1.6 MHz
DC ACCURACY
2
Resolution 12 Bits
Integral Nonlinearity ±1 LSB
Differential Nonlinearity Guaranteed no missed codes to 12 bits −0.95/+1.5 LSB
0 V to REF
IN
Input Range Straight binary output coding
Offset Error ±0.6 ±8 LSB
Offset Error Match ±0.5 LSB
Gain Error ±2 LSB
Gain Error Match ±0.6 LSB
0 V to 2 × REF
IN
Input Range
−REF
IN
to +REF
IN
biased about REF
IN
with twos complement output coding
offset
Positive Gain Error ±2 LSB
Positive Gain Error Match ±0.5 LSB
Zero Code Error ±0.6 ±8 LSB
Zero Code Error Match ±0.5 LSB
Negative Gain Error ±1 LSB
Negative Gain Error Match ±0.5 LSB
ANALOG INPUT
Input Voltage Range RANGE bit set to 1 0 REF
IN
V
RANGE bit set to 0, V
DD
= 4.75 V to 5.25 V
for 0 V to 2 × REF
IN
0 2 × REF
IN
V
DC Leakage Current ±1 µA
Input Capacitance
20
pF
REFERENCE INPUT
REF
IN
Input Voltage ±1% specified performance 2.5 V
DC Leakage Current
±1
µA
REF
IN
Input Impedance f
SAMPLE
= 1 MSPS 36 kΩ