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參數(shù)資料
| 型號： | TC7126ACKW |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 3-1/2 Digit Analog-to-Digital Converters |
| 中文描述： | 3-1/2數(shù)字模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 198K |
| 代理商： | TC7126ACKW |
3-226
TELCOM SEMICONDUCTOR, INC.
3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
TC7126
TC7126A
Figure 5. Common-Mode Voltage Removed in Battery Operation With V
IN
= Analog Common
100
μ
A. This FET will hold the common line at 3V should an
external load attempt to pull the common line toward V
+
.
Analog common source current is limited to 1
μ
A. Therefore,
analog common is easily pulled to a more negative voltage
(i.e., below V
+
– 3V).
The TC7126A connects the internal V
+
puts to analog common during the auto-zero phase. During
the reference-integrate phase, V
–
common. If V
+
mon, a common-mode voltage exists, but is rejected by the
converter's 86 dB common-mode rejection ratio. In battery
operation, analog common and V
removing common-mode voltage concerns. In systems where
V
–
voltage, analog common should be connected to V
The analog common pin serves to set the analog sec-
tion reference, or common point. The TC7126A is specifi-
cally designed to operate from a battery or in any measure-
ment system where input signals are not referenced (float)
IN
and V
–
in-
IN
is connected to analog
IN
is not externally connected to analog com-
–
are usually connected,
IN
is connected to power supply ground or to a given
–
.
with respect to the TC7126A's power source. The analog
common potential of V
+
–3V gives a 7V end of battery life
voltage. The common potential has a 0.001%/% voltage
coefficient and a 15
output impedance.
With sufficiently high total supply voltage (V
+
–V
–
>7V),
analog common is a very stable potential with excellent
temperature stability (typically 35 ppm/
°
c). This potential
can be used to generate the TC7126A's reference voltage.
An external voltage reference will be unnecessary in most
cases because of the 35 ppm/
°
C temperature coefficient.
See "TC7126A Internal Voltage Reference" discussion.
TEST (Pin 37)
The TEST pin potential is 5V less than V
+
. TEST may be
used as the negative power supply connection for external
CMOS logic. The TEST pin is tied to the internally-generated
negative logic supply through a 500
resistor. The TEST pin
load should not be more than 1 mA. See "Digital Section" for
additional information on using TEST as a negative digital
logic supply.
If TEST is pulled HIGH (to V
+
),
all segments plus the
minus sign will be activated. DO NOT OPERATE IN THIS
MODE FOR MORE THAN SEVERAL MINUTES. With
TEST= V
+
, the LCD segments are impressed with a DC
voltage which will destroy the LCD.
TC7126A Internal Voltage Reference
The TC7126A's analog common voltage temperature
stability has been significantly improved (Figure 7). The "A"
version of the industry-standard TC7126 device allows
users to upgrade old systems and design new systems
without external voltage references. External R and C val-
ues do not need to be changed. Figure 10 shows analog
common supplying the necessary voltage reference for the
TC7126A.
VBUFF
V+
IN
CAZ
VINT
BP
POL
SEGMENT
DRIVE
OSC1
OSC3
OSC2
V+
V+
V–
ANALOG
COMMON
V–
V+
V–
V+
GND
GND
MEASURED
SYSTEM
POWER
SOURCE
9V
LCD
TC7126A
+
V–
IN
Figure 6. Common-Mode Voltage Reduces Available Integrator
Swing (V
COM
≠
V
IN
)
R
I
+
–
V
IN
V
C
I
INTEGRATOR
V
I
=
[
[
V
CM
V
IN
–
INPUT
BUFFER
C
I
=
R
I
=
Integration capacitor
Integration resistor
4000
f
OSC
Integration time
T
I
=
=
Where:
V
I
CM
–
+
–
+
TI
RI CI
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC7126ACLW | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
| TC7126ACPL | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
| TC7126CLW | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
| TC7126CPL | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
| TC7126 | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC7126ACKW713 | 功能描述:LCD 驅(qū)動器 3.5 digit A/D RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7126ACLW | 功能描述:LCD 驅(qū)動器 3.5 digit A/D RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7126ACLW713 | 功能描述:LCD 驅(qū)動器 w/Hold RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7126ACPL | 功能描述:LCD 驅(qū)動器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7126AIPL | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
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