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参数资料
| 型号： | TC7129 |
| 厂商： | TelCom Semiconductor, Inc. |
| 英文描述： | 4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER WITH ON-CHIP LCD DRIVERS |
| 中文描述： | 4-1/2数字模拟到数字转换器，带有片上LCD驱动器 |
| 文件页数： | 13/15页 |
| 文件大小： | 214K |
| 代理商： | TC7129 |
3-243
TELCOM SEMICONDUCTOR, INC.
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TC7129
4-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTER WITH ON-CHIP LCD DRIVERS
Figure 13. Integrator Block Diagram
The buffer amplifier has a common-mode input voltage
range from 1.5V above V
–
to 1V below V
+
. The integrator
amplifier can swing to within 0.3V of the rails, although for
best linearity the swing is usually limited to within 1V. Both
amplifiers can supply up to 80
μ
A of output current, but
should be limited to 20
μ
A for good linearity.
Continuity Indicator
A comparator with a 200 mV threshold is connected
between IN HI (pin 33) and IN LO (pin 32). Whenever the
voltage between inputs is less than 200 mV, the
CONTINUITY output (pin 27) will be pulled HIGH, activating
the continuity annunciator on the display. The continuity
pin can also be used as an input to drive the continuity
annunciator directly from an external source. A schematic
of the input/output nature of this pin is shown in Figure 15.
Figure 14. Continuity Indicator Circuit
COM
BUFFER
200 mV
V
IN HI
–
+
IN LO
–
+
CONT
500 k
TO DISPLAY
DRIVER
(NOT LATCHED)
TC7129
COMMON
REF HI
BUFFER
INTE-
GRATOR
–
DE
ZI, X10
COMPARATOR 1
200 mV
CREF
RINT
CINT
INT1
IN HI
+
–
+
–
+
REF LO
DE
IN LO
–
+
DE–
DE+
DE+
DE–
100 pF
V
–
+
CONTINUITY
INT1, INT2
CONTINUITY
COMPARATOR
500 k
REST
TO DISPLAY DRIVER
10
pF
COMPARATOR 2
TO DIGITAL
SECTION
TC7129
INT
X10
Table I. Switch Legends
Label
Meaning
DE
DE–
Open during all deintegrate phases.
Closed during all deintegrate phases when input
voltage is negative.
Closed during all deintegrate phases when input
voltage is positive.
Closed during the first integrate phase
(measurement of the input voltage).
Closed during the second integrate phase
(measurement of the amplifier offset).
Open during both integrate phases.
Closed during the rest phase.
Closed during the zero-integrate phase.
Closed during the X10 phase.
Open during the X10 phase.
DE+
INT
1
INT
2
INT
REST
ZI
X10
X10
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相关代理商/技术参数 |
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| TC7129_06 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
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| TC7129CJL713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
| TC7129CKW | 功能描述:LCD 驱动器 w/LCD Driver RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7129CKW713 | 功能描述:LCD 驱动器 w/LCD Driver RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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