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參數(shù)資料
| 型號(hào)： | TC7107ACKW |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | 3-1/2 DIGIT A/D CONVERTERS |
| 中文描述： | 3-1/2位數(shù)的A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大小： | 296K |
| 代理商： | TC7107ACKW |
3-193
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
Oscillator Components
R
OSC
(Pin 40 to Pin 39) should be 100k
. C
OSC
is
selected using the equation:
For f
OSC
of 48kHz, C
OSC
is 100pF nominally.
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 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*
V
REF
100.0mV
1.000V
200.0mV
2.000V
* V
FS
= 2 V
REF
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/in
2
. Rather than dividing the
input voltage by two the reference voltage should be set to
directly.
The differential reference can also be used when a
digital zero reading is required when V
IN
is not equal to zero.
This is common in temperature measuring instrumentation.
A compensating offset voltage can be applied between
analog common and V
–
nected between V
+
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.
IN
. The transducer output is con-
IN
and analog common.
f
OSC
=
0.45
RC
Integrating Capacitor –
C
INT
C
INT
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 (f
OSC
= 48kHz) a 0.22
μ
F value is suggested. If a
different oscillator frequency is used, C
INT
must be changed
in inverse proportion to maintain the nominal
±
2 V integrator
swing.
An exact expression for C
INT
is:
C
INT
=
V
INT
Where:
f
OSC
= Clock frequency at Pin 38
V
FS
= Full-scale input voltage
R
INT
= Integrating resistor
V
INT
= Desired full-scale integrator output swing
C
INT
must have low dielectric absorption to minimize
rollover error. A polypropylene capacitor is recommended.
Integrating Resistor –
R
INT
The input buffer amplifier and integrator are designed
with class A output stages. The output stage idling current
is 100
μ
A. The integrator and buffer can supply 20
μ
A 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 200mV full-scale, R
INT
is 47k
. 2.0V full-scale requires
470k
.
Component
Value
C
AZ
R
INT
C
INT
Note:
1.
Nominal Full-Scale Voltage
200.0mV
0.47
μ
F
47k
0.22
μ
F
2.000V
0.047
μ
F
470k
0.22
μ
F
f
OSC
= 48kHz (3 readings/sec)
V
FS
R
INT
1
f
OSC
(4000) (
) (
)
TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
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