Datasheet

AD7991/AD7995/AD7999
Rev. B | Page 3 of 28
SPECIFICATIONS
AD7991
1
The temperature range of the Y version is −40°C to +125°C. Unless otherwise noted, V
DD
= 2.7 V to 5.5 V, V
REF
= 2.5 V, f
SCL
= 3.4 MHz,
and T
A
= T
MIN
to T
MAX
.
Table 2.
Y Version
Parameter Min Typ Max Unit Test Conditions/Comments
DYNAMIC PERFORMANCE
2, 3
See the Sample Delay and Bit Trial Delay
section, f
IN
= 10 kHz sine wave for f
SCL
from 1.7 MHz to 3.4 MHz
f
IN
= 1 kHz sine wave for f
SCL
up to 400 kHz
Signal-to-Noise and Distortion (SINAD)
4
69.5 70 dB
Signal-to-Noise Ratio (SNR)
4
70 71 dB
Total Harmonic Distortion (THD)
4
−75.5 dB
Peak Harmonic or Spurious Noise (SFDR)
4
−77.5 dB
Intermodulation Distortion (IMD)
4
fa = 11 kHz, fb = 9 kHz for f
SCL
from
1.7 MHz to 3.4 MHz
fa = 5.4 kHz, fb = 4.6 kHz for f
SCL
up
to 400 kHz
Second-Order Terms −92 dB
Third-Order Terms −88 dB
Channel-to-Channel Isolation
4
−90 dB f
IN
= 10 kHz
Full-Power Bandwidth
4
14 MHz @ 3 dB
1.5 MHz @ 0.1 dB
DC ACCURACY
2, 5
Resolution 12 Bits
Integral Nonlinearity
4
±1 LSB
±0.5 LSB
Differential Nonlinearity
4
±0.9 LSB Guaranteed no missed codes to 12 bits
±0.5 LSB
Offset Error
4
±1 ±7 LSB
Offset Error Matching ±0.5 LSB
Offset Temperature Drift 4.43 ppm/°C
Gain Error
4
±2 LSB
Gain Error Matching ±0.7 LSB
Gain Temperature Drift 0.69 ppm/°C
ANALOG INPUT
Input Voltage Range 0 V
REF
V V
REF
= V
IN3
/V
REF
or V
DD
DC Leakage Current ±1 μA
Input Capacitance 34 pF
Channel 0 to Channel 2—during
acquisition phase
4 pF
Channel 0 to Channel 2—outside
acquisition phase
35 pF Channel 3—during acquisition phase
5 pF Channel 3—outside acquisition phase
REFERENCE INPUT
V
REF
Input Voltage Range 1.2 V
DD
V
DC Leakage Current ±1 μA
V
REF
Input Capacitance 5 pF Outside conversion phase
35 pF During conversion phase
Input Impedance 69 kΩ