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參數(shù)資料
| 型號： | TC7129ILW |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC44 |
| 封裝： | PLASTIC, MO-047, LCC-44 |
| 文件頁數(shù)： | 28/28頁 |
| 文件大?。?/td> | 544K |
| 代理商： | TC7129ILW |
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2006 Microchip Technology Inc.
DS21459D-page 9
TC7129
3.5
Voltage Reference
(DREF, RREF, RBIAS, CRF)
The reference potentiometer (RREF) provides an
adjustment for adjusting the reference voltage; any
value above 20 k
Ω is adequate. The bias resistor
(RBIAS) limits the current through DREF to less than
150
μA. The reference filter capacitor (CRF) forms an
RC filter with RBIAS to help eliminate noise.
3.6
Input Filter (RIF, CIF)
For added stability, an RC input noise filter is usually
included in the circuit. The input filter resistor value
should not exceed 100 k
Ω. A typical RC time constant
value is 16.7 msec to help reject line frequency noise.
The input filter capacitor should have low leakage for a
high-impedance input.
3.7
Battery
The typical circuit uses a 9V battery as a power source.
However, any value between 6V and 12V can be used.
For operation from batteries with voltages lower than
6V and for operation from power supplies, see
4.0
TYPICAL APPLICATIONS
4.1
TC7129 as a Replacement Part
The TC7129 is a direct pin-for-pin replacement part for
the ICL7129. Note, however, that the ICL7129 requires
a capacitor and resistor between pins 26 and 28 for
phase compensation. Since the TC7129 uses internal
phase compensation, these parts are not required and,
in fact, must be removed from the circuit for stable
operation.
4.2
Powering the TC7129
While the most common power source for the TC7129
is a 9V battery, there are other possibilities. Some of
the more common ones are explained below.
4.2.1
±5V Power Supply
Measurements are made with respect to power supply
ground. DGND (pin 36) is set internally to about 5V less
than V+ (pin 24); it is not intended to be a power supply
input and must not be tied directly to power supply
ground. It can be used as a reference for external logic,
as explained in Section 4.3 “Connecting to External
Logic”, (see Figure 4-1).
Figure 4-1:
Powering the TC7129 From
a ±5V Power Supply.
4.2.2
Low Voltage Battery Source
A battery with voltage between 3.8V and 6V can be
used to power the TC7129 when used with a voltage
doubler circuit, as shown in Figure 4-2. The voltage
doubler uses the TC7660 DC-to-DC voltage converter
and two external capacitors.
Figure 4-2:
Powering the TC7129 From
a Low-Voltage Battery.
V–
V+
REF HI
REF LO
IN HI
COMMON
IN LO
DGND
VIN
+
–
-5V
0.1 F
+5V
0.1 F
24
34
35
28
33
32
23
36
TC7129
0.1 F
V–
TC7129
V+
REF HI
REF LO
IN HI
COMMON
IN LO
DGND
3.8V
to
6V
+
10 F
+
8
2
4
10 F
+
–
3
TC7660
VIN
5
24
34
35
28
33
32
23
36
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