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參數(shù)資料
| 型號(hào)： | TC820CPL |
| 廠商： | Microchip Technology 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位A / D轉(zhuǎn)換頻率計(jì)數(shù)器和邏輯轉(zhuǎn)換的探討 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TC820CPL |
3-164
TELCOM SEMICONDUCTOR, INC.
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
TC820
Digital Ground (DGND)
Digital ground is generated from an internal zener diode
(Figure 14). The voltage between V
DD
and DGND is the
internal supply voltage for the digital section of the TC820.
DGND will sink a minimum of 3mA.
DGND establishes the low logic level reference for the
TC820 mode select inputs, and for the frequency and logic
probe inputs. The DGND pin can be used as the negative
supply for external logic gates, such as the logic probe
buffers. To ensure correct counter operation at high fre-
quency, connect a 1
μ
F capacitor from DGND to V
DD
.
DGND also provides the drive voltage for the LCD. The
TC820 40-pin package internally connects the LCD V
DISP
pin to DGND, and provides an LCD drive voltage of about
5V
P-P
. In the 44-pin package, connecting the V
DISP
pin to
DGND will provide a 5V LCD drive voltage.
Digital Input Logic Levels
Logic levels for the TC820 digital inputs are referenced
to V
DD
and DGND. The high-level threshold is V
DD
– 1.5V
and the low logic level is DGND +1.5V. In most cases,
digital inputs will be connected directly to V
DD
with a
mechanical switch. CMOS gates can also be used to
control the logic inputs, as shown in the logic probe inputs
section.
Figure 13. Powering the TC820 From a Low-Voltage Battery
V
DISP
The V
DISP
input sets the peak-to-peak LCD drive volt-
age. In the 40-pin package, V
DISP
is connected internally to
DGND, providing a typical LCD drive voltage of 5 V
P-P
. The
44-pin package includes a separate V
DISP
input for applica-
tions requiring a variable or temperature-compensated LCD
drive voltage. See the applications information for sug-
gested circuits.
APPLICATIONS INFORMATION
Power Supplies
The TC820 is designed to operate from a single power
supply such as a 9V battery (Figure 12). The converter will
operate over a range of 7V to 15V. For battery operation,
analog common (COM) provides a common-mode bias
voltage (see analog common discussion in the theory of
operation section). However, measurements cannot be
referenced to battery ground. To do so will exceed the
negative common-mode voltage limit.
A battery with voltage between 3.5V and 7V can be used
to power the TC820, when used with a voltage doubler, as
shown in Figure 13. The voltage doubler uses the TC7660
and two external capacitors. With this configuration mea-
surements can be referenced either to Analog Common or
to battery ground.
Figure 12. Powering the TC820 From a Single 9V Battery
TC820
V
IN
V
–
REF
V
DD
V
+
REF
COM
V
+
IN
V
–
IN
V
SS
+
–
9V
+
–
V
DD
V
SS
V
+
REF
V
–
COM
TC820
3.5V to 6V
TC7660
TC04
V
IN
V
IN
+
–
+
–
V
IN
10
μ
F
3
4
2
8
5
10
μ
F
+
+
+
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