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参数资料
| 型号： | TC7135CLIRT |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 3/17页 |
| 文件大小： | 162K |
| 代理商： | TC7135CLIRT |
11
TC7135
TC7135-10 9/27/99
2001 Microchip Technology Inc.
DS21460A
4-1/2 Digit Analog-To-Digital Converter
Zero-Crossing Flip-Flop
The flip-flop interrogates data once every clock pulse
after transients of the previous clock pulse and half-clock
pulse have died down. False zero-crossings caused by
clock pulses are not recognized. Of course, the flip-flop
delays the true zero-crossing by up to one count in every
instance, and if a correction were not made, the display
would always be one count too high. Therefore, the counter
is disabled for one clock pulse at the beginning of the
reference integrate (deintegrate) phase. This one-count
delay compensates for the delay of the zero-crossing flip-
flop, and allows the correct number to be latched into the
display. Similarly, a one-count delay at the beginning of
auto-zero gives an overload display of 0000 instead of 0001.
No delay occurs during signal integrate, so true ratiometric
readings result.
Generating a Negative Supply
A negative voltage can be generated from the positive
supply by using a TC7660. (See Figure 9.)
TC7660
TC7135
11
1
+5V
8
23
(–5V)
V
+
V
–
24
10
F
5
4
10
F
+
Figure 9. Negative Supply Voltage Generator
TYPICAL APPLICATIONS
R2
R1
fO
GATES ARE 74C04
C
+5V
VOUT
390pF
30k
7
8
2
3
16k
0.22
F
16k
4
1k
1
+5V
VOUT
2
3
1
4
7
6
R2
100k
R2
100k
R3
50k
C2
10pF
R4
2k
C1
0.1
F
–
+
LM311
–
+
LM311
56k
Comparator Clock Circuit
RC Oscillator Circuit
1. fO ≈
, RP =
a. If R = R1 = R2, f 0.55/RC
b. If R2 >> R1, f 0.45/R1C
c. If R2 << R1, f 0.72/R1C
2. Examples:
a. f = 120 kHz, C = 420 pF
R1 = R2 ≈ 10.9 k
b. f = 120 kHz, C = 420 pF, R2 = 50 k
R1 = 8.93 k
c. f = 120 kHz, C = 220 pF, R2 = 5 k
R1 = 27.3 k
1
2 C[0.41 RP + 0.70 R1]
R1 R2
R1 + R2
相关PDF资料 |
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|---|---|
| TC7135CLITR | 1-CH DUAL-SLOPE ADC, ACCESS, PQCC28 |
| TC7135CBURT | 1-CH DUAL-SLOPE ADC, PQFP64 |
| TC7135CLIRT | 1-CH DUAL-SLOPE ADC, ACCESS, PQCC28 |
| TC7135CBUTR | 1-CH DUAL-SLOPE ADC, ACCESS, PQFP64 |
| TC7135CPI | 1-CH 9-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP28 |
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