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參數(shù)資料
| 型號： | TC820CLW |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE |
| 中文描述： | 3-3/4數(shù)字A / D轉(zhuǎn)換頻率計數(shù)器和邏輯探針轉(zhuǎn)爐 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TC820CLW |
3-162
TELCOM SEMICONDUCTOR, INC.
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
TC820
Table I. TC820 Control Input Truth Table
Logic Input
FREQ/
VOLTS
RANGE/
FREQ
TC820
Function
LOGIC
X
0
X
0
1
Logic Probe
A/D Converter,
V
FULL SCALE
= 2
3
V
REF
A/D Converter,
V
FULL SCALE
= 20
3
V
REF
Frequency Counter
0
1
0
1
Frequency
Counter Input
0
NOTES:
1. Logic "0" = DGND
2. Logic "1" = V
DD
Figure 9.
Common-Mode Voltage Reduces Available
Integrator Swing (V
COM
T
V
IN
)
+
–
+
–
RI
CI
VI
VIN
INTEGRATOR
INPUT
BUFFER
+
–
TI= Integration Time =
CI= Integration Capacitor
RI= Integration Resistor
4000
f
OSC
VCM
Where:
V
I
=
[
[
V
CM
V
IN
–
TI
RI CI
FREQ/VOLTS
This input determines whether the TC820 is in the
analog-to-digital conversion mode or in the frequency counter
mode. When FREQ/VOLTS is connected to V
DD
, the TC820
will measure frequency at the RANGE/FREQ input. When
unconnected, or connected to DGND, the TC820 will oper-
ate as an analog-to-digital converter. This input has an
internal 5
μ
A pull-down to DGND.
LOGIC
The LOGIC input is used to activate the logic probe
function. When connected to V
DD
, the TC820 will enter the
logic probe mode. The LCD will show "OL" and all decimal
points will be off. The decimal point inputs directly control
"high" and "low" display annunciators. When LOGIC is
unconnected, or connected to DGND, the TC820 will per-
form analog-to-digital or frequency measurements as se-
lected by the FREQ/VOLTS input. The LOGIC input has an
internal 5
μ
A pull-down to DGND.
system where input signals are not referenced (float)
with respect to the TC820 power source. The analog common
potential of V
DD
– 3.3V gives a 7V end-of-battery-life voltage.
The analog common potential has a voltage coefficient of
0.001%/%.
With a sufficiently high total supply voltage (V
DD
– V
SS
> 7V), analog common is a very stable potential with excellent
temperature stability (typically 35ppm/
°
C). This potential
can be used to generate the TC820 reference voltage. An
external voltage reference will be unnecessary in most
cases, because of the 35ppm/
°
C temperature coefficient.
See the applications section for details.
Function Control Input Pin
Functional Description
The TC820 operating modes are selected with the
function control inputs. The control input truth table is shown
in Table I. The high logic threshold is
≥
V
DD
- 1.5V and the
low logic level is
≤
DGND +1.5V.
RANGE/FREQ
The function of this dual-purpose pin is determined by
the FREQ/VOLTS input. When FREQ/VOLTS is connected
to V
DD
, RANGE/FREQ is the input for the frequency counter
function. Pulses at this input are counted with a time base
equal to f
OSC
/40,000. Since this input has CMOS input levels
(V
DD
- 1.5V and DGND +1.5V), an external buffer is recom-
mended.
When the TC820 analog-to-digital converter function is
selected, connecting RANGE/FREQ to V
DD
will divide the
integration time by 10. Therefore, the RANGE/FREQ input
can be used to perform a 10:1 range change without
changing external components.
DP0/LO, DP1/HI
The function of these dual-purpose pins is determined
by the LOGIC input. When the TC820 is in the analog-to-
digital converter mode, these inputs control the LCD decimal
points. The decimal point truth table is shown in Table II.
These inputs have internal 5
μ
A pull-downs to DGND when
the voltage/frequency measurement mode is active.
Table II. TC820 Decimal Point Truth Table
Decimal Point Inputs
DP1
DP0
LCD
0
0
1
1
0
1
0
1
3999
399.9
39.99
3.999
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