AD7991 Analog Devices, AD7991 Datasheet - Page 3

• Manufacturer Part Number: AD7991
• Description: 4-Channel, 12-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23
• Manufacturer: Analog Devices

Specifications of AD7991

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 140kSPS
• Interface: I²C/Ser 2-Wire
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOT

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