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TC7126IPL Datasheet(PDF) 15 Page - Microchip Technology

Part # TC7126IPL
Description  3-1/2 Digit Analog-to-Digital Converters
PDF  22 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7126IPL Datasheet(HTML) 15 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21458B-page 15
TC7126/A
8.3
Flat Package
TheTC7126isavailableinanepoxy 64-pin formed
lead package. A test socket for the TC7126ACBQ
device is available:
Part Number:
IC 51-42
Manufacturer:
Yamaichi
Distribution:
Nepenthe Distribution
2471 East Bayshore, Ste. 520
Palo Alto, CA 94043
(650) 856-9332
8.4
Ratiometric Resistance
Measurements
The TC7126A’s true differential input and differential
reference make ratiometric reading possible. In a ratio-
metric operation, an unknown resistance is measured
with respect to a known standard resistance. No
accurately defined reference voltage is needed.
The unknown resistance is put in series with a known
standard and a current passed through the pair. The
voltage developed across the unknown is applied to the
input and the voltage across the known resistor is
applied to the reference input. If the unknown equals
the standard, the display will read 1000. The displayed
reading
can
be
determined
from
the
following
expression:
EQUATION 8-1:
The display will over range for RUNKNOWN ≥ 2x
RSTANDARD (see Figure 8-2).
FIGURE 8-2:
LOW PARTS COUNT
RATIOMETRIC
RESISTANCE
MEASUREMENT
FIGURE 8-3:
3-1/2 DIGIT TRUE RMS AC DMM
Displayed (Reading) =
RUNKNOWN
RSTANDARD
x 1000
VREF+
VREF-
VIN+
VIN-
ANALOG
COMMON
TC7126A
LCD
RSTANDARD
RUNKNOWN
V+
8
14
7
13
12
11
10
9
1
2
3
4
5
6
TC7126A
9V
VIN
9M
Ω
900k
Ω
90k
Ω
10k
Ω
2V
20V
200V
200mV
1N4148
10M
Ω
1M
Ω
0.02
µF
1M
Ω 10%
47k
Ω
1
Ω
10%
20k
Ω
10%
6.8
µF
1
µF
COM
C1 = 3pF to 10pF, Variable
C2 = 132pF, Variable
+
+
AD636
2.2
µF
0.01
µF
10k
Ω
240k
Ω
Segment
Drive
LCD
39
40
28
27
38
29
26
1
35
32
31
30
26
36
BP
V+
V-
VREF+
VREF-
ANALOG
COMMON
V IN+
VOUT+
V-
C1
C2



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