參數(shù)資料
型號(hào)： TC820CKW
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 10/28頁
文件大小： 616K
代理商： TC820CKW
TC820
DS21476B-page 18
2002 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 = 10k
and C = 68pF. The resis-
tor value should be
≥ 100k. For accurate frequency
measurement, an RC oscillator frequency of 40kHz 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 fre-
quency, 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 rec-
ommended; a low dielectric absorption capacitor
(Mylar) is required.
5.6.2
REFERENCE VOLTAGE
CAPACITOR - CREF
The reference voltage capacitor used to ramp the inte-
grator output voltage back to zero during the reference
integrate cycle is stored on CREF.A 0.1F capacitor is
typical. A good quality, low leakage capacitor (such as
Mylar) should be used.
TC820
40kHz
38
39
5pF
10pF
22M
470k
37
TOSC =
0.3
RC
5pF
37
38
39
110k
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
相關(guān)PDF資料
PDF描述
TC820CLW 1-CH DUAL-SLOPE ADC, PQCC44
TC820CPL 1-CH DUAL-SLOPE ADC, PDIP40
TC820CLW DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44
TC820CPL DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40
TC821CKW CONVERTER SUBSYSTEM ADC, PARALLEL ACCESS, PQFP44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC820CKW713 功能描述:LCD 驅(qū)動(dòng)器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)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
TC820CLW 功能描述:LCD 驅(qū)動(dòng)器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)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
TC820CLW713 功能描述:LCD 驅(qū)動(dòng)器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)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
TC820CPL 功能描述:LCD 驅(qū)動(dòng)器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)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
TC8-20S2405R 制造商:TRUMPOWER 制造商全稱:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*