參數(shù)資料
型號： AD7938BCP
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
中文描述： 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32
封裝： MO-220-VHHD-2, LFCSP-32
文件頁數(shù)： 3/32頁
文件大?。?/td> 1332K
代理商： AD7938BCP
Preliminary Technical Data
AD7938/AD7939
AD7938—SPECIFICATIONS
V
DD
= V
DRIVE
= 2.7 V to 5.25 V, Internal/External V
REF
= 2.5 V, unless otherwise noted, F
CLKIN
= 24 MHz, F
SAMPLE
= 1.5 MSPS; T
A
= T
MIN
to
T
MAX
, unless otherwise noted.
Table 1.
Parameter
B Version
1
DYNAMIC PERFORMANCE
Signal-to-Noise + Distortion (SINAD)
2
70
Signal-to-Noise Ratio (SNR)
2
70
Total Harmonic Distortion (THD)
2
75
Peak Harmonic or Spurious Noise (SFDR)
2
75
Intermodulation Distortion (IMD)
2
Second-Order Terms
85
Third-Order Terms
85
Channel to Channel Isolation
85
Aperture Delay
2
5
Aperture Jitter
2
50
Full Power Bandwidth
2, 3
20
2.5
DC ACCURACY
Resolution
12
Integral Nonlinearity
2
±1
Differential Nonlinearity
2
±0.95
Total Unadjusted Error
TBD
Single-Ended and Pseudo-Differential Input
Offset Error
2
±4.5
Offset Error Match
2
±0.5
Gain Error
2
±2
Gain Error Match
2
±0.6
Fully Differential Input
Positive Gain Error
2
±2
Positive Gain Error Match
2
±0.6
Zero-Code Error
2
±3
Zero-Code Error Match
2
±1
Negative Gain Error
2
±2
Negative Gain Error Match
2
±0.6
ANALOG INPUT
Single-Ended Input Range
0 to V
REF
or 0 to 2 × V
REF
Pseudo-Differential Input Range: V
IN+
0 to V
REF
or 2 × V
REF
V
IN
0.1 to +0.4
Fully Differential Input Range: V
IN+
and V
IN
V
CM
± V
REF
/2
V
IN+
and V
IN
V
CM
± V
REF
DC Leakage Current
5
±1
Input Capacitance
45
10
REFERENCE INPUT/OUTPUT
V
REF
Input Voltage
6
2.5
DC Leakage Current
±1
V
REF
Input Impedance
10
V
REFOUT
Output Voltage
2.5
V
REFOUT
Temperature Coefficient
15
V
REF
Noise
10
130
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
LSB max
V
V
V
V
V
μA max
pF typ
pF typ
V
μA max
k typ
V
ppm/°C typ
μV typ
μV typ
Test Conditions/Comments
F
IN
= 50 kHz sine wave
80 dB typ
82 dB typ
fa = 40.1 kHz, fb = 51.5 kHz
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 12 bits
Straight binary output coding
Twos complement output coding
Depending on RANGE bit setting
Depending on RANGE bit setting
V
CM
= common-mode voltage
4
= V
REF
/2
V
CM
= V
REF
, V
IN+
or V
IN
must remain within GND/V
DD
When in track
When in hold
±1% for specified performance
±0.1% @ 25°C
0.1 Hz to 10 Hz bandwidth
0.1 Hz to 1 MHz bandwidth
Rev. PrN | Page 3 of 32
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