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| 型号： | TC850ILW713 |
| 元件分类： | ADC |
| 英文描述： | 1-CH 15-BIT MULTI-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 7/26页 |
| 文件大小： | 417K |
| 代理商： | TC850ILW713 |
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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