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參數(shù)資料
| 型號： | TC850ILW |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 15BIT FAST 44PLCC |
| 標準包裝： | 27 |
| 位數(shù)： | 15 |
| 采樣率（每秒）： | 40 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 雙 ± |
| 工作溫度： | -25°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應商設備封裝： | 44-PLCC |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個差分，單極 |
2006 Microchip Technology Inc.
DS21479C-page 15
TC850
7.0
ANALOG SECTION TYPICAL
APPLICATIONS
7.1
Component Selection
7.1.1
REFERENCE VOLTAGE
The typical value for reference voltage VREF1 is
1.6384V. This value yields a full scale voltage of
3.2768V and resolution of 100
μV per step. The VREF2
value is derived by dividing VREF1 by 64. Thus, typical
VREF2 value is 1.6384V/64, or 25.6 mV. The VREF2
value should be adjusted within ±1% to maintain 15-bit
accuracy for the total conversion process;
EQUATION 7-1:
:
The reference voltage is not limited to exactly 1.6384V,
however, because the TC850 performs a ratiometric
conversion. Therefore, the conversion result will be:
EQUATION 7-2:
The full scale voltage can range from 3.2V to 3.5V. Full
scale voltages of less than 3.2V will result in increased
noise in the Least Significant bits, while a full scale
above 3.5V will exceed the input common-mode range.
7.1.2
INTEGRATION RESISTOR
The TC850 buffer supplies 25
μA of integrator charging
current with minimal linearity error. RINT is easily
calculated:
EQUATION 7-3:
For a full scale voltage of 3.2768V, values of RINT
between 120 k
Ω and 150 kΩ are acceptable.
7.1.3
INTEGRATION CAPACITOR
The integration capacitor should be selected to
produce an integrator swing of
≈ 4V at full scale. The
capacitor value is easily calculated:
EQUATION 7-4:
The integration capacitor should be selected for low
dielectric absorption to prevent rollover errors. A
polypropylene, polyester or polycarbonate dielectric
capacitor is recommended.
7.1.4
REFERENCE CAPACITORS
The reference capacitors require a low-leakage dielec-
tric, such as polypropylene, polyester or polycarbon-
ate. A value of 1
μF is recommended for operation over
the temperature range. If high-temperature operation is
not required, the CREF values can be reduced.
7.1.5
AUTO-ZERO CAPACITORS
Five capacitors are required to auto-zero the input
buffer, integrator amplifier and comparator. Recom-
mended capacitors are 0.1
μF film dielectric (such as
polyester or polypropylene). Ceramic capacitors are
not recommended.
VREF =
VREF1 ± 1%
64
Digital Counts =
16384
VIN
VREF1
RINT =
VFULLSCALE
25
μA
C =
VFS
RINT
4 256
4V FCLOCK
where:
FCLOCK is the crystal or external oscillator
frequency and VFS is the maximum input voltage.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC850ILW713 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit Hi Speed A/D RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構:Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TC8521AM | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:REAL TIME CLOCK ケ |
| TC8521AP | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:REAL TIME CLOCK ケ |
| TC8566AF | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:FLOPPY DISK CONTROLLER |
| TC8569AF | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:FLOPPY DISK CONTROLLER |
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