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TC7107AIPL 数据表(PDF) 11 Page - TelCom Semiconductor, Inc

部件名 TC7107AIPL
功能描述  3-1/2 DIGIT A/D CONVERTERS
Download  19 Pages
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制造商  TELCOM [TelCom Semiconductor, Inc]
网页  http://www.telcom-semi.com
标志 TELCOM - TelCom Semiconductor, Inc

TC7107AIPL 数据表(HTML) 11 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
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Oscillator Components
ROSC (Pin 40 to Pin 39) should be 100kΩ. COSC is
selected using the equation:
For fOSC of 48kHz, COSC is 100pF nominally.
Note that fOSC is divided by four to generate the TC7106A
internal control clock. The backplane drive signal is derived
by dividing fOSC by 800.
To achieve maximum rejection of 60Hz noise pickup,
the signal-integrate period should be a multiple of 60Hz.
Oscillator frequencies of 240kHz, 120kHz, 80kHz, 60kHz,
48kHz, 40kHz, etc. should be selected. For 50 Hz rejection,
oscillator frequencies of 200kHz, 100kHz, 66 2/3kHz, 50kHz,
40kHz, etc. would be suitable. Note that 40kHz (2.5 read-
ings/second) will reject both 50Hz and 60Hz.
Reference Voltage Selection
A full-scale reading (2000 counts) requires the input
signal be twice the reference voltage.
Required Full-Scale Voltage*
VREF
200.0mV
100.0mV
2.000V
1.000V
* VFS = 2 VREF
In some applications a scale factor other than unity may
exist between a transducer output voltage and the required
digital reading. Assume, for example, a pressure transducer
output is 400mV for 2000 lb/in2. Rather than dividing the
input voltage by two the reference voltage should be set to
200mV.
This permits the transducer input to be used
directly.
The differential reference can also be used when a
digital zero reading is required when VIN is not equal to zero.
This is common in temperature measuring instrumentation.
A compensating offset voltage can be applied between
analog common and V
IN.
The transducer output is con-
nected between V+IN and analog common.
The internal voltage reference potential available at
analog common will normally be used to supply the convert-
er's reference. This potential is stable whenever the supply
potential is greater than approximately 7V. In applications
where an externally-generated reference voltage is desired,
refer to Figure 7.
fOSC =
0.45
RC
Integrating Capacitor – CINT
CINT should be selected to maximize the integrator
output voltage swing without causing output saturation. Due
to the TC7106A/7107A superior temperature coefficient
specification, analog common will normally supply the differ-
ential voltage reference. For this case a
±2V full-scale
integrator output swing is satisfactory. For 3 readings/
second (fOSC = 48kHz) a 0.22µF value is suggested. If a
different oscillator frequency is used, CINT must be changed
in inverse proportion to maintain the nominal
±2 V integrator
swing.
An exact expression for CINT is:
CINT =
VINT
Where:
fOSC = Clock frequency at Pin 38
VFS = Full-scale input voltage
RINT = Integrating resistor
VINT = Desired full-scale integrator output swing
CINT must have low dielectric absorption to minimize
rollover error. A polypropylene capacitor is recommended.
Integrating Resistor – RINT
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 20µA drive
currents with negligible linearity errors. RINT 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 200mV full-scale, RINT is 47kΩ. 2.0V full-scale requires
470k
Ω.
Component
Nominal Full-Scale Voltage
Value
200.0mV
2.000V
CAZ
0.47
µF
0.047
µF
RINT
47k
470k
CINT
0.22
µF
0.22
µF
Note:1.
fOSC = 48kHz (3 readings/sec)
VFS
RINT
1
fOSC
(4000) (
) (
)
TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS


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