AD7938 Analog Devices, AD7938 Datasheet - Page 5

• Manufacturer Part Number: AD7938
• Description: 8-Channel, 1.5 MSPS, 12-Bit Parallel ADCs with a Sequencer
• Manufacturer: Analog Devices

Specifications of AD7938

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 1.5MSPS
• Interface: Byte,Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p,5V p-p,Uni (Vref),Uni (Vref) x 2,Uni 2.5V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

Data Sheet
AD7939 SPECIFICATIONS
V
T
Table 3.
Parameter
DYNAMIC PERFORMANCE
DC ACCURACY
ANALOG INPUT
A
DD
Signal-to-Noise and Distortion (SINAD)
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise (SFDR)
Intermodulation Distortion (IMD)
Channel-to-Channel Isolation
Aperture Delay
Aperture Jitter
Full Power Bandwidth
Resolution
Integral Nonlinearity
Differential Nonlinearity
Single-Ended and Pseudo Differential Input
Fully Differential Input
Single-Ended Input Range
Pseudo Differential Input Range
Fully Differential Input Range
DC Leakage Current
Input Capacitance
= T
= V
Second-Order Terms
Third-Order Terms
Offset Error
Offset Error Match
Gain Error
Gain Error Match
Positive Gain Error
Positive Gain Error Match
Zero-Code Error
Zero-Code Error Match
Negative Gain Error
Negative Gain Error Match
V
V
V
V
IN+
IN−
IN+
IN+
MIN
DRIVE
and V
and V
to T
= 2.7 V to 5.25 V, internal/external V
MAX
IN−
IN−
2
2
2
2
, unless otherwise noted.
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
2
Value
61
60
−70
−72
−86
−90
−75
5
72
50
10
10
±0.5
±0.5
±2
±0.5
±1.5
±0.5
±1.5
±0.5
±2
±0.5
±1.5
±0.5
0 to V
0 to 2 × V
0 to V
0 to 2 × V
−0.3 to +0.7
−0.3 to +1.8
V
V
±1
45
10
CM
CM
REF
± V
± V
= 2.5 V, unless otherwise noted, f
REF
REF
1
REF
REF
REF
REF
/2
Rev. C | Page 5 of 36
Unit
dB min
dB min
dB max
dB max
dB typ
dB typ
dB typ
ns typ
ps typ
MHz typ
MHz typ
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
V
V
V
V
V typ
V typ
V
V
µA max
pF typ
pF typ
CLKIN
Test Conditions/Comments
f
Differential mode
Single-ended mode
fa = 30 kHz, fb = 50 kHz
f
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 10 bits
Straight binary output coding
Twos complement output coding
RANGE bit = 0
RANGE bit = 1
RANGE bit = 0
RANGE bit =1
V
V
V
V
When in track
When in hold
IN
IN
= 25.5 MHz, f
DD
DD
CM
CM
= 50 kHz sine wave
= 50 kHz, f
= 3 V
= 5 V
= common-mode voltage
= V
REF
, V
IN+
NOISe
or V
SAMPLE
= 300 kHz
IN−
must remain within GND/V
= 1.5 MSPS;
AD7938/AD7939
3
= V
REF
/2
DD