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參數(shù)資料
| 型號： | AD7938 |
| 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, LFCSP-32 |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 1332K |
| 代理商： | AD7938 |
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AD7938/AD7939
Preliminary Technical Data
Parameter
V
REF
Output Impedance
V
REF
Input Capacitance
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Capacitance, C
IN5
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Floating-State Leakage Current
Floating-State Output Capacitance
5
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time
Throughput Rate
POWER REQUIREMENTS
V
DD
V
DRIVE
I
DD7
Normal Mode(Static)
Normal Mode (Operational)
Auto-Standby Mode
Auto-Shutdown Mode
Full Shutdown Mode
Power Dissipation
Normal Mode (Operational)
Auto-Standby Mode (Static)
Auto-Shutdown Mode (Static)
Full Shutdown Mode
B Version
1
10
15
25
2.4
0.8
±1
10
2.4
0.4
±10
10
Straight (Natural) Binary
Twos Complement
t
2
+ 13 t
clk
+ t
20
135
1.5
2.7/5.25
2.7/5.25
0.5
3.2
2.6
1.55
90
1
1
1
16
8
450
270
5
3
5
3
Unit
typ
pF typ
pF typ
V min
V max
μA max
pF max
V min
V max
μA max
pF max
Test Conditions/Comments
When in track
When in hold
Typically 10 nA, V
IN
= 0 V or V
DRIVE
I
SOURCE
= 200 μA;
I
SINK
= 200 μA
CODING bit = 0
CODING bit =1
Full-scale step input
Digital I/Ps = 0 V or V
DRIVE
V
DD
= 2.7 V to 5.25 V, SCLK on or off
V
DD
= 4.75 V to 5.25 V
V
DD
= 2.7 V to 3.6 V
F
SAMPLE
= 250 kSPS
(Static)
F
SAMPLE
= 250 kSPS
(Static)
SCLK on or off
V
DD
= 5 V
V
DD
= 3 V
V
DD
= 5 V
V
DD
= 3 V
V
DD
= 5 V
V
DD
= 3 V
V
DD
= 5 V
V
DD
= 3 V
ns
ns max
MSPS max
V min/max
V min/max
mA typ
mA max
mA max
mA typ
μA max
mA typ
μA max
μA max
mW max
mW max
μW max
μW max
μW max
μW max
μW max
μW max
1
Temperature ranges as follows: B Versions: 40°C to +85°C.
2
See the Terminology section.
3
Analog inputs with slew rates exceeding 27 V/μs (full-scale input sine wave >3.5 MHz) within the acquisition time may cause an incorrect conversion result to be
returned by the converter.
4
For full common-mode range see Fig
and
.
ure 28
Figure 29
5
Sample tested during initial release to ensure compliance.
6
This device is operational with an external reference in the range 0.1 V to 3.5 V in differential mode and 0.1 V to V
DD
in pseudo-differential and single-ended modes.
See the Reference Section for more details.
7
Measured with a midscale dc input.
Rev. PrN | Page 6 of 32
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