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| 型号： | TC7106IKW |
| 厂商： | Microchip Technology |
| 文件页数： | 14/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DGT LCD DVR 44MQFP |
| 标准包装： | 96 |
| 显示器类型： | LCD |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 800µA |
| 电源电压： | 9V |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
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TC7106/A/TC7107/A
7.0
COMPONENT VALUE
7.4
Integrating Resistor (R INT )
SELECTION
7.1 Auto-Zero Capacitor (C AZ )
The C AZ capacitor size has some influence on system
noise. A 0.47 μF capacitor is recommended for 200 mV
full scale applications where 1LSB is 100 μV. A
0.047 μF capacitor is adequate for 2.0V full scale
applications. A mylar type dielectric capacitor is
The input buffer amplifier and integrator are designed
with class A output stages. The output stage idling
current is 100 μA. The integrator and buffer can supply
20 μA drive currents with negligible linearity errors.
R INT is chosen to remain in the output stage linear drive
region, but not so large that printed circuit board
leakage currents induce errors. For a 200 mV full scale,
R INT is 47 k Ω . 2.0V full scale requires 470 k Ω .
adequate.
7.2 Reference Voltage Capacitor
(C REF )
The reference voltage used to ramp the integrator out-
put voltage back to zero during the reference integrate
TABLE 7-1:
Component
Value
COMPONENT VALUES AND
NOMINAL FULL SCALE
VOLTAGE
Nominal Full Scale Voltage
200.0 mV 2.000V
cycle is stored on C REF . A 0.1 μF capacitor is
acceptable when V IN - is tied to analog common. If a
large Common mode voltage exists (V REF - – analog
common) and the application requires 200 mV full
C AZ
R INT
C INT
0.47 μF
47 k Ω
0.22 μF
0.047 μF
470 k Ω
0.22 μF
scale, increase C REF to 1.0 μF. Rollover error will be
held to less than 1/2 count. A mylar dielectric capacitor
is adequate.
Note:
7.5
F OSC = 48 kHz (3 readings per sec).
Oscillator Components
7.3
Integrating Capacitor (C INT )
R OSC (Pin 40 to Pin 39) should be 100 k Ω . C OSC is
selected using the equation:
C INT should be selected to maximize the integrator
F OSC = 0.45
output voltage swing without causing output saturation.
Due to the TC7106A/TC7107A superior temperature
coefficient specification, analog common will normally
supply the differential voltage reference. For this case,
a ±2V full scale integrator output swing is satisfactory.
For 3 readings/second (F OSC = 48 kHz), a 0.22 μF
EQUATION 7-2:
Where:
F OSC = 48 kHz
RC
value is suggested. If a different oscillator frequency is
C OSC
=
100 pF
used, C INT must be changed in inverse proportion to
maintain the nominal ±2V integrator swing.
An exact expression for C INT is:
EQUATION 7-1:
Note that F OSC is divided by four to generate the
TC7106A internal control clock. The backplane drive
signal is derived by dividing F OSC by 800.
To achieve maximum rejection of 60 Hz noise pickup,
( 4000 ) ? ? ? ? ? ? ? ?
1 V FS
F OSC R INT
Where:
C INT
------------- -----------
= ------------------------------------------------------
V INT
the signal integrate period should be a multiple of
60 Hz. Oscillator frequencies of 240 kHz, 120 kHz,
80 kHz, 60 kHz, 48 kHz, 40 kHz, etc. should be
selected. For 50 Hz rejection, oscillator frequencies of
200 kHz, 100 kHz, 66-2/3 kHz, 50 kHz, 40 kHz, etc.
F OSC
V FS
=
=
Clock Frequency at Pin 38
Full Scale Input Voltage
would be suitable. Note that 40 kHz (2.5 readings/
second) will reject both 50 Hz and 60 Hz.
R INT
V INT
=
=
Integrating Resistor
Desired Full Scale Integrator Output
7.6
Reference Voltage Selection
Swing
A full scale reading (2000 counts) requires the input
signal be twice the reference voltage.
C INT must have low dielectric absorption to minimize
rollover error. A polypropylene capacitor is
recommended.
Required Full Scale Voltage*
200.0 mV
2.000V
* V FS = 2V REF
V REF
100.0 mV
1.000V
DS21455D-page 14
? 2008 Microchip Technology Inc.
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