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| 型号： | TC7126CLW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 12/26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
6.0
COMPONENT VALUE
6.4
Integrating Resistor (R INT )
SELECTION
6.1 Auto-Zero Capacitor (C AZ )
The C AZ capacitor size has some influence on system
noise. A 0.47 μ F capacitor is recommended for 200mV
full scale applications where 1LSB is 100 μ V. A 0.033 μ F
capacitor is adequate for 2.0V full scale applications. A
mylar type dielectric capacitor is adequate.
The input buffer amplifier and integrator are designed
with Class A output stages. The output stage idling
current is 6 μ A. The integrator and buffer can supply
1 μ A drive current with negligible linearity errors. R INT is
chosen to remain in the output stage linear drive
region, but not so large that PC board leakage currents
induce errors. For a 200mV full scale, R INT is 180k Ω . A
2V full scale requires 1.8M Ω .
6.2
Reference Voltage Capacitor (C REF )
Component
Value
Nominal Full Scale Voltage
200mV 2V
The reference voltage, used to ramp the integrator out-
put voltage back to zero during the reference integrate
phase, is stored on C REF . A 0.1 μ F capacitor is accept-
able when V REF - is tied to analog common. If a large
C AZ
R INT
C INT
0.33 μ F
180k Ω
0.047 μ F
0.033 μ F
1.8M Ω
0.047 μ F
Common mode voltage exists (V REF - – analog com-
mon) and the application requires a 200mV full scale,
increase C REF to 1 μ F. Rollover error will be held to less
than 0.5 count. A Mylar type dielectric capacitor is
Note:
6.5
F OSC = 48kHz (3 readings per sec).
Oscillator Components
adequate.
C OSC should be 50pF; R OSC is selected from the
equation:
6.3
Integrating Capacitor (C INT )
C INT should be selected to maximize integrator output
EQUATION 6-2:
voltage swing without causing output saturation. Due to
the TC7126A’s superior analog common temperature
coefficient specification, analog common will normally
F OSC =
0.45
RC
supply the differential voltage reference. For this case,
a ±2V full scale integrator output swing is satisfactory.
For 3 readings per second (F OSC = 48kHz), a 0.047 μ F
value is suggested. For 1 reading per second, 0.15 μ F
is recommended. If a different oscillator frequency is
used, C INT must be changed in inverse proportion to
maintain the nominal ±2V integrator swing.
An exact expression for C INT is:
EQUATION 6-1:
For a 48kHz clock (3 conversions per second),
R = 180k Ω .
Note that F OSC is 44 to generate the TC7126A’s
internal clock. The backplane drive signal is derived by
dividing F OSC by 800.
To achieve maximum rejection of 60Hz noise pickup,
the signal integrate period should be a multiple of
60Hz. Oscillator frequencies of 24kHz, 12kHz, 80kHz,
60kHz, 40kHz, etc. should be selected. For 50Hz rejec-
tion, oscillator frequencies of 20kHz, 100kHz,
Where:
C INT =
? 1 ? ? V FS ?
(4000) ? F OSC ? ? R INT ?
V INT
66-2/3kHz, 50kHz, 40kHz, etc. would be suitable. Note
that 40kHz (2.5 readings per second) will reject both
50Hz and 60Hz.
F OSC =
V FS =
R INT =
V INT =
Clock frequency at Pin 38
Full scale input voltage
Integrating resistor
Desired full scale integrator output swing
At 3 readings per second, a 750 Ω resistor should be
placed in series with C INT . This increases accuracy by
compensating for comparator delay. C INT must have
low dielectric absorption to minimize rollover error. A
polypropylene capacitor is recommended.
DS21458C-page 12
? 2006 Microchip Technology Inc.
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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 |
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