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| 型號： | AD7874SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP28 |
| 封裝： | 0.600 INCH, HERMETIC SEALED, CERDIP-28 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 414K |
| 代理商： | AD7874SQ |
AD7874
REV. C
–4–
T E RMINOLOGY
ACQUISIT ION T IME
Acquisition T ime is the time required for the output of the
track/hold amplifiers to reach their final values, within
±
1/2
LSB, after the falling edge of
INT
(the point at which the track/
holds return to track mode). T his includes switch delay time,
slewing time and settling time for a full-scale voltage change.
APE RT URE DE LAY
Aperture Delay is defined as the time required by the internal
switches to disconnect the hold capacitors from the inputs. T his
produces an effective delay in sample timing. It is measured by
applying a step input and adjusting the
CONVST
input position
until the output code follows the step input change.
APE RT URE DE LAY MAT CHING
Aperture Delay Matching is the maximum deviation in aperture
delays across the four on-chip track/hold amplifiers.
APE RT URE JIT T E R
Aperture Jitter is the uncertainty in aperture delay caused by
internal noise and variation of switching thresholds with signal
level.
DROOP RAT E
Droop Rate is the change in the held analog voltage resulting
from leakage currents.
CHANNE L-T O-CHANNE L ISOLAT ION
Channel-to-Channel Isolation is a measure of the level of
crosstalk between channels. It is measured by applying a full-
scale 1 kHz signal to the other three inputs. T he figure given is
the worst case across all four channels.
SNR, T HD, IMD
See DYNAMIC SPECIFICAT IONS section.
PIN CONFIGURAT IONS
DIP and SOIC
V
IN1
V
IN2
V
IN4
V
IN3
REF IN
AGND
DB0 (LSB)
V
DD
V
SS
REF OUT
CLK
DB1
V
DD
DB2
DB11 (MSB)
DB3
DB10
DB4
DB9
DB5
DB8
DB6
DGND
DB7
13
18
1
2
28
27
5
6
7
24
23
22
3
4
26
25
8
21
9
20
10
19
11
12
17
16
14
15
TOP VIEW
(Not to Scale)
AD7874
INT
CONVST
RD
CS
LC C C
V
DD
CLK
V
D
3
V
I
28
V
I
2
V
I
1
D
D
D
D
D
REF OUT
REF IN
DB1
AGND
DB0 (LSB)
DB10
DB11 (MSB)
D
D
V
S
26
V
I
27
DB3
DB2
AD7874
TOP VIEW
(Not to Scale)
4
25
22
24
23
21
19
20
18
17
12 13
16
14 15
11
10
9
8
7
6
5
CONVST
RD
CS
I
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