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參數(shù)資料
| 型號： | TC835CKW |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | PERSONAL COMPUTER DATA ACQUISITION A/D CONVERTER |
| 中文描述： | 個人計算機數(shù)據采集的A / D轉換器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 206K |
| 代理商： | TC835CKW |
3-71
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
20
k
6.8 k
V+
1.25V REF
TC04
V+
REF
IN
6.8V
ZENER
V+
I
Z
V–
V+
ANALOG
GROUND
ANALOG
COMMON
REF
IN
ANALOG
COMMON
TC835
TC835
LATCH
LATCH
LATCH
LATCH
LATCH
COUNTERS
CONTROL LOGIC
MULTIPLEXER
POLARITY
D5
D4
D3
D2
D1
13 B1
14 B2
15 B4
16 B8
POFF
MSB
DIGIT
DRIVE
SIGNAL
LSB
ODATA
24
22
25
27
28
26
21
DGND
CLIN
RUN/
HOLD
OVER–
STROBE
BUSY
RANGE
ZERO
AFROM
INTEGRATOR
OUTPUT
OVERRANGE
WHEN
APPLICABLE
UNDERRANGE
WHEN
APPLICABLE
SYSTEM
ZERO
10,001
COUNTS
FULL MEASUREMENT CYCLE
40,002 COUNTS
SIGNAL
INTE
10,000
COUNTS
(FIXED)
REFERENCE
INTEGRATE
20,001
COUNTS (MAX)
BUSY
EXPANDED SCALE
BELOW
D5
D4
D3
D2
D1
FIRST D5 OF SYSTEM ZERO
AND REFERENCE INTEGRATE
ONE COUNT LONGER.
100
COUNTS
DIGIT SCAN
STROBE
AUTO ZERO
SIGNAL
INTEGRATE
REFERENCE
INTEGRATE
D5
D4
D3
D2
D1
DIGIT SCAN
FOR
OVERRANGE
*
*
*
Figure 5. Using an External Reference
Figure 7. Timing Diagrams for Outputs
Figure 6. Digital Section Functional Diagram
Digital Section Functional Description
The major digital subsystems within the TC835 are
illustrated in Figure 6, with timing relationships shown in
Figure 7. The multiplexed BCD output data can be displayed
on LCD or LED display with the TC7211A (LCD)
4-digit display driver.
The digital section is best described through a discus-
sion of the control signals and data outputs.
RUN/HOLD Input
(Pin 25)
When left open, this pin assumes a logic "1" level. With
a R/H = 1, the TC835 performs conversions continuously,
with a new measurement cycle beginning every 40,002
clock pulses.
When R/H changes to a logic "0," the measurement
cycle in progress will be completed, and data held and
displayed as long as the logic "0" condition exists.
A positive pulse (>300nsec) at R/H initiates a new
measurement cycle. The measurement cycle in progress
when R/H initially assumed the logic "0" state must be
completed before the positive pulse can be recognized as a
single conversion run command.
TC835
PERSONAL COMPUTER
DATA ACQUISITION A/D CONVERTER
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