參數(shù)資料
型號： TC818A
廠商： Microchip Technology Inc.
英文描述： Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display
中文描述： 自動測距模擬到數(shù)字轉(zhuǎn)換器與數(shù)字顯示3-1/2
文件頁數(shù)： 20/24頁
文件大?。?/td> 583K
代理商： TC818A
TC818A
DS21475B-page 20
2002 Microchip Technology Inc.
FIGURE 3-15:
R
CALCULATION (200
MANUAL OPERATION)
Where:
V
ANCOM
= Potential at Analog Common
≈
2.7V
R
S
= 220
R
I
= 163.85
R
X
= 300
R
S
= Internal switch 33 resistance
≈
600
EQUATION 3-2:
For a 3.1V integrator swing, the value of R
BUF is
easily calculated:
Where:
V
INT
T
I
C
I
R
X
MAX
V
X
MAX
= Integrator swing = 3.1V
= Integration time = 100msec
= Integration capacitor = 0.1μF
= 300
= 700mV
EQUATION 3-3:
With a low battery voltage of 6.6V, analog common will
be approximately 3.6V above the negative supply termi-
nal. With the integrator swinging down from analog com-
mon toward the negative supply, a 3.1V swing will set
the integrator output to 0.5V above the negative supply.
3.21
Capacitors - C
INT
, C
AZ
and C
REF
The integration capacitor, C
INT
, must have low dielec-
tric absorption. A 0.1
μ
F polypropylene capacitor is sug-
gested. The auto-zero capacitor, C
AZ
, and reference
capacitor, C
REF
, should be selected for low leakage
and dielectric absorption. Polystyrene capacitors are
good choices.
3.22
Reference Voltage Adjustment
The TC818A contains a low temperature drift internal
voltage reference. The analog common potential
(Pin 29) is established by this reference. Maximum drift
is a low 75ppm/°C. Analog common is designed to be
approximately 2.6V below V
CC
(Pin 28). A resistive
divider
(R18/R19,
Functional
TC818A reference input voltage (REFHI, Pin 34) to
approximately 163.85mV.
Diagram)
sets
the
With an input voltage near full scale on the 200mV
range, R19 is adjusted for the proper reading.
3.23
Display Hold Feature
The LCD will not be updated when HOLD (Pin 60) is
connected to GND (Pin 58). Conversions are made, but
the display is not updated. A HOLD mode LCD annun-
ciator is activated when HOLD is low.
The LCD HOLD annunciator is activated through the
triplex LCD driver signal at Pin 13.
3.24
Flat Package Socket
Sockets suitable for prototype work are available. A
USA source is:
Nepenthe Distribution
2471 East Bayshore, Suite 520
Palo Alto, CA 94303
(415) 856-9332
TWX: 910-373-2060
“CBQ” Socket, Part No. IC51-064-042
3.25
Resistive Ladder Networks
Resistor attenuator networks for voltage and resistance
measurements are available from:
Caddock Electronics
1717 Chicago Avenue
Riverside, CA 92507
Tel: (714) 788-1700
TWX: 910-332-6108
TABLE 3-6:
RESISTIVE LADDER
NETWORKS
163.85
220
300
R
S
≈
600
SW33
R
1
R
2
R
3
V
X
Analog Common = V
CC
–
3V
V
CC
= 9V
R
BUF =
(V
CC
– V
ANCOM
)R
X
(R
X
+ R
S
+ R
1
+ R
8
)
= 0.63V
R
BUF =
V
X
MAX
(T
I
)
C
I
(V
INT
)
= 200k
Attenuator
Accuracy
0.1%
0.25%
0.25%
Attenuator Type
Caddock
Part Number
1776-C441
1776-C44
T1794-204-1
Voltage
Voltage
Resistance
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