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參數(shù)資料
| 型號(hào)： | TC7126RCLW |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| 封裝： | REVERSE, PLASTIC, LCC-44 |
| 文件頁數(shù)： | 24/26頁 |
| 文件大?。?/td> | 413K |
| 代理商： | TC7126RCLW |
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2006 Microchip Technology Inc.
DS21458C-page 7
TC7126/A
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
(40-Pin PDIP)
Normal
(Reversed)
Symbol
Description
1
(40)
V+
Positive supply voltage.
2
(39)
D1
Activates the D section of the units display.
3
(38)
C1
Activates the C section of the units display.
4
(37)
B1
Activates the B section of the units display.
5
(36)
A1
Activates the A section of the units display.
6
(35)
F1
Activates the F section of the units display.
7
(34)
G1
Activates the G section of the units display.
8
(33)
E1
Activates the E section of the units display.
9
(32)
D2
Activates the D section of the tens display.
10
(31)
C2
Activates the C section of the tens display.
11
(30)
B2
Activates the B section of the tens display.
12
(29)
A2
Activates the A section of the tens display.
13
(28)
F2
Activates the F section of the tens display.
14
(27)
E2
Activates the E section of the tens display.
15
(26)
D3
Activates the D section of the hundreds display.
16
(25)
B3
Activates the B section of the hundreds display.
17
(24)
F3
Activates the F section of the hundreds display.
18
(23)
E3
Activates the E section of the hundreds display.
19
(22)
AB4
Activates both halves of the 1 in the thousands display.
20
(21)
POL
Activates the negative polarity display.
21
(20)
BP
LCD Backplane drive output (TC7106A). Digital Ground (TC7107A).
22
(19)
G3
Activates the G section of the hundreds display.
23
(18)
A3
Activates the A section of the hundreds display.
24
(17)
C3
Activates the C section of the hundreds display.
25
(16)
G2
Activates the G section of the tens display.
26
(15)
V-
Negative power supply voltage.
27
(14)
VINT
The integrating capacitor should be selected to give the maximum voltage swing that
ensures component tolerance buildup will not allow the integrator output to saturate.
When analog common is used as a reference and the conversion rate is 3 readings
per second, a 0.047
μF capacitor may be used. The capacitor must have a low
dielectric constant to prevent rollover errors. See Section 6.3 “Integrating Capaci-
tor (CINT)”, Integrating Capacitor for additional details.
28
(13)
VBUFF
Integration resistor connection. Use a 180k
Ω resistor for a 200mV full-scale range
and a 1.8M
Ω resistor for a 2V full scale range.
29
(12)
CAZ
The size of the auto-zero capacitor influences system noise. Use a 0.33
μF capacitor
for 200mV full scale, and a 0.033
μF capacitor for 2V full scale. See Section 6.1
“Auto-Zero Capacitor (CAZ)”, Auto-Zero Capacitor for additional details.
30
(11)
VIN-
The analog LOW input is connected to this pin.
31
(10)
VIN+
The analog HIGH input signal is connected to this pin.
32
(9)
ANALOG
COMMON
This pin is primarily used to set the Analog Common mode voltage for battery opera-
tion, or in systems where the input signal is referenced to the power supply. It also
acts as a reference voltage source. See Section 7.3 “Analog Common (Pin 32)”,
Analog Common for additional details.
33
(8)
CREF-
See Pin 34.
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