- 您现在的位置：买卖IC网 > PDF目录1880 > TC7126CLW713 (Microchip Technology)IC ADC 3 1/2DGT LCD DVR 44-PLCC PDF资料下载
参数资料
| 型号： | TC7126CLW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DGT LCD DVR 44-PLCC |
| 标准包装： | 500 |
| 显示器类型： | LCD |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 55µA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC |
| 包装： | 带卷 (TR) |
TC7126/A
7.3
Analog Common (Pin 32)
7.5
TC7126A Internal Voltage
The analog common pin is set at a voltage potential
approximately 3V below V+. The potential is between
2.7V and 3.35V below V+. Analog common is tied inter-
nally to an N-channel FET capable of sinking 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 IN + and V IN -
inputs to analog common during the auto-zero phase.
During the reference integrate phase, V IN - is con-
nected to analog common. If V IN - is not externally con-
Reference
The TC7126A’s analog common voltage temperature
stability has been significantly improved (Figure 7-3).
The “A” version of the industry standard TC7126 device
allows users to upgrade old systems and design new
systems, without external voltage references. External
shows analog common supplying the necessary
voltage reference for the TC7126A.
200
180
nected to analog common, a Common mode voltage
exists, but is rejected by the converter ’s 86dB Common
mode rejection ratio. In battery operation, analog com-
160
140
No
Maximum
Specified
Typical
mon and V IN - are usually connected, removing Com-
mon mode voltage concerns. In systems where V IN - is
connected to power supply ground or to a given
voltage, analog common should be connected to V IN -.
The analog common pin serves to set the analog sec-
tion reference, or common point. The TC7126A is spe-
cifically designed to operate from a battery, or in any
120
100
80
60
40
Maximum
Typical
No
Maximum
Specified
Typical
measurement system where input signals are not refer-
enced (float) with respect to the TC7126A’s power
source. The analog common potential of V+ – 3V gives
20
0
TC7126A
ICL7126
ICL7136
a 7V end of battery life voltage. The common potential
has a 0.001%/% voltage coefficient and a 15 Ω output
impedance.
With sufficiently high total supply voltage (V+ – V- > 7V),
analog common is a very stable potential with excellent
temperature stability (typically 35ppm/°C). This poten-
tial can be used to generate the TC7126A’s reference
voltage. An external voltage reference will be unneces-
sary in most cases because of the 35ppm/°C tempera-
FIGURE 7-3:
Coefficient
9V
+
Analog Common Temp.
26
V-
1
V+
240k Ω
Reference discussion.
7.4 TEST (Pin 37)
The TEST pin potential is 5V less than V+. TEST may
be used as the negative power supply connection for
TC7126A
V REF +
36
V REF
10k Ω
V REF -
external CMOS logic. The TEST pin is tied to the inter-
nally generated negative logic supply through a 500 Ω
resistor. The TEST pin load should be no more than
1mA. See Section 5.0 “DIGITAL SECTION” , Digital
Section for additional information on using TEST as a
negative digital logic supply.
35
ANALOG 32
COMMON
SET V REF = 1/2 V REF
I f TEST is pulled HIGH (to V+), all segments plus the
FIGURE 7-4:
TC7126A Internal Voltage
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.
? 2006 Microchip Technology Inc.
Reference Connection
DS21458C-page 15
相关PDF资料 |
PDF描述 |
|---|---|
| TC7129CLW713 | IC ADC 4 1/2DGT LCD DVR 44-PLCC |
| TC7135CLI713 | IC ADC 4 1/2DGT 28-PLCC |
| TC7136CKW713 | IC ADC 3 1/2DGT LOW PWR 44-MQFP |
| TC7660MJA | IC REG SWITCHD CAP INV ADJ 8CDIP |
| TC820CKW713 | IC ADC 3 3/4DGT LGC PROBE 44MQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7126CPL | 功能描述:LCD 驱动器 Low Power 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 |
| TC7126CPL | 制造商:Microchip Technology Inc 功能描述:3.5 DIGIT ADC CMOS 7126 DIP40 制造商:Microchip Technology Inc 功能描述:3.5 DIGIT ADC, CMOS, 7126, DIP40 制造商:Microchip Technology Inc 功能描述:3.5 DIGIT ADC, CMOS, 7126, DIP40; Resolution (Bits):3.5bit; Supply Voltage Max:15V; Supply Current:55A; Digital IC Case Style:DIP; No. of Pins:40; Input Channel Type:Differential; Data Interface:Parallel; Operating Temperature ;RoHS Compliant: Yes |
| TC7126IPL | 功能描述:LCD 驱动器 Low Power 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 |
| TC7126RCPL | 功能描述:LCD 驱动器 Low Power 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 |
| TC7126RIPL | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit Analog-to-Digital Converters |
发布紧急采购，3分钟左右您将得到回复。