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參數(shù)資料
| 型號： | TC850CLW |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 7/26頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 15BIT FAST 44PLCC |
| 標(biāo)準(zhǔn)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： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 44-PLCC |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個差分，單極 |
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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
R
4 256
4V FCLOCK
where:
FCLOCK is the crystal or external oscillator
frequency and VFS is the maximum input voltage.
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