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参数资料
| 型号： | TC14433ELI |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 3-1/2 Digit, Analog-to-Digital Converter |
| 中文描述： | 3-1/2数字，模拟到数字转换器 |
| 文件页数： | 5/10页 |
| 文件大小： | 149K |
| 代理商： | TC14433ELI |
3-131
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
3-1/2 DIGIT A/D CONVERTERS
TC14433
TC14433A
PIN DESCRIPTIONS
(Cont.)
Pin No.
Pin No.
24-Pin
24-Pin
PDIP/CerDip
SOIC
16
16
Pin No.
28-Pin
PLCC
19
Symbol
DS
4
Description
Digit select pins — The digit select output goes high when the respective digit
is selected. The MSD (1/2 digit) turns on immediately after an EOC pulse.
17
17
20
DS
3
The remaining digits turn on in sequence from MSD to LSD.
18
18
21
DS
2
To ensure that the BCD data has settled, an inter-digit blanking time of two
clock periods is included.
19
19
23
DS
1
Clock frequency divided by 80 equals multiplex rate. For example, a system
clock of 60 kHz gives a multiplex rate of 0.8 kHz.
20
20
24
Q
0
See Figure 12 for digit select timing diagram.
21
21
25
Q
1
BCD data output pins — Multiplexed BCD outputs contain three full digits of
information during digit select DS
2
, DS
3
, DS
4
.
22
22
26
Q
2
During DS
1
, the 1/2 digit, overrange, underrange and polarity information is
available.
23
23
28
Q
3
Refer to truth table.
24
24
28
V
DD
Positive power supply — This is the most positive power supply pin.
8,15, 22
NC
Not Used.
CIRCUIT DESCRIPTION
The TC14433 CMOS IC becomes a modified dual-
slope A/D with a minimum of external components. This IC
has the customary CMOS digital logic circuitry, as well as
CMOS analog circuitry. It provides the user with digital
functions (such as counters, latches, multiplexers) and
analog functions (such as operational amplifiers and com-
parators) on a single chip.
Features of this system include auto-zero, high input
impedances and auto-polarity. Low power consumption
and a wide range of power supply voltages are also advan-
tages of this CMOS device. The system's auto-zero function
compensates for the offset voltage of the internal amplifiers
and comparators. In this "ratiometric system," the output
reading is the ratio of the unknown voltage to the reference
voltage, where a ratio of 1 is equal to the maximum count of
1999. It takes approximately 16,000 clock periods to com-
plete one conversion cycle. Each conversion cycle may be
divided into 6 segments. Figure 7 shows the conversion
cycle in 6 segments for both positive and negative inputs.
Segment 1
— The offset capacitor (C
O
), which com-
pensates for the input offset voltages of the buffer and
integrator amplifiers, is charged during this period. How-
ever, the integrator capacitor is shorted. This segment
requires 4000 clock periods.
Segment 2
— During this segment, the integrator
output decreases to the comparator threshold voltage. At
this time, a number of counts equivalent to the input offset
Figure 7. Integrator Waveforms at Pin 6
Figure 8. Equivalent Circuit Diagrams of the Analog
Section During Segment 4 of the Timing Cycle
START
1
2
3
4
5
6
TYPICAL
POSITIVE
INPUT
VOLTAGE
TYPICAL
NEGATIVE
INPUT
VOLTAGE
TIME
SEGMENT
NUMBER
END
V
X
V
X
C
1
COMPARATOR
R
1
V
X
BUFFER
–
INTEGRATOR
–
+
–
+
+
voltage of the comparator is stored in the offset latches for
later use in the auto-zero process. The time for this segment
is variable and less than 800 clock periods.
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| TC14433AEPG | 3-1/2 Digit, Analog-to-Digital Converter |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC14433ELI713 | 功能描述:模数转换器 - ADC 3-1/2 Digit A/D BCD RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TC14433EPG | 功能描述:模数转换器 - ADC 3-1/2 Digit A/D BCD RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TC14433EPG | 制造商:Microchip Technology Inc 功能描述:IC ADC 3.5 DIGIT LED/LCD DISPLAY 制造商:Microchip Technology Inc 功能描述:IC, ADC, 3.5 DIGIT LED/LCD DISPLAY |
| TC14433EPG | 制造商:Microchip Technology Inc 功能描述:A/D Converter (A-D) IC |
| TC14433T | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit, Analog-to-Digital Converter |
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