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参数资料
| 型号： | TC820C/KW |
| 元件分类： | ADC |
| 英文描述： | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQFP44 |
| 封装： | 10 X 10 MM, 2 MM HEIGHT, PLASTIC, MQFP-44 |
| 文件页数： | 10/34页 |
| 文件大小： | 435K |
| 代理商： | TC820C/KW |
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TC820
DS21476C-page 18
2007 Microchip Technology Inc.
FIGURE 5-4:
Suggested Crystal Oscillator
Circuit.
Where low cost is important, the RC circuit of Figure 5-5
can be used. The frequency of this circuit will be
approximately:
EQUATION 5-1:
FIGURE 5-5:
RC Oscillator Circuit.
Typical values are R = 10 k
Ω and C = 68pF. The
resistor value should be
≥ 100 kΩ. For accurate
frequency measurement, an RC oscillator frequency of
40 kHz is required.
5.5
System Timing
All system timing is derived from the clock oscillator.
The clock oscillator is divided by 2 prior to clocking the
A/D counters. The clock is also divided by 8 to drive the
buzzer, by 240 to generate the LCD backplane
frequency, and by 40,000 for the frequency counter
time-base. A simplified diagram of the system clock is
shown in Figure 5-6.
FIGURE 5-6:
System Clock Generation.
5.6
Component Value Selection
5.6.1
AUTO-ZERO CAPACITOR - CAZ
The value of the auto-zero capacitor (CAZ) has some
influence on system noise. A 0.47 F capacitor is
recommended; a low dielectric absorption capacitor
(Mylar) is required.
5.6.2
REFERENCE VOLTAGE
CAPACITOR - CREF
The reference voltage capacitor used to ramp the
integrator output voltage back to zero during the
reference integrate cycle is stored on CREF. A 0.1 F
capacitor is typical. A good quality, low leakage
capacitor (such as Mylar) should be used.
TC820
40kHz
38
39
5pF
10pF
22M
Ω
470k
Ω
37
TOSC =
0.3
RC
5pF
37
38
39
110k
Ω
10pF
75pF
TC820
A/D
Counter
TC820
÷ 40,000
Counter
Time-Base
÷ 240
LCD
Backplane
Driver
÷ 8
Buzzer
÷ 2
OSC1
OSC2
OSC3
XTAL
Oscillator
Components
RC
Oscillator
Components
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相关代理商/技术参数 |
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| TC820CKW713 | 功能描述:LCD 驱动器 3-3/4 A/D Converter 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 |
| TC820CLW | 功能描述:LCD 驱动器 3-3/4 A/D Converter 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 |
| TC820CLW713 | 功能描述:LCD 驱动器 3-3/4 A/D Converter 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 |
| TC820CPL | 功能描述:LCD 驱动器 3-3/4 A/D Converter 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 |
| TC8-20S2405R | 制造商:TRUMPOWER 制造商全称:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
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