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参数资料
| 型号： | TC820CLW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 8/24页 |
| 文件大小： | 185K |
| 代理商： | TC820CLW |
16
3-3/4 A/D Converter with Frequency
Counter and Logic Probe
TC820
TC820-10 10/17/96
2001 Microchip Technology Inc.
DS21476A
Digital Ground (DGND)
Digital ground is generated from an internal zener
diode (Figure 14). The voltage between VDD 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
F capacitor from DGND to VDD.
DGND also provides the drive voltage for the LCD.
The TC820 40-pin package internally connects the LCD
VDISP pin to DGND, and provides an LCD drive voltage of
about 5VP-P. In the 44-pin package, connecting the VDISP
pin to DGND will provide a 5V LCD drive voltage.
Digital Input Logic Levels
Logic levels for the TC820 digital inputs are referenced
to VDD and DGND. The high-level threshold is VDD – 1.5V
and the low logic level is DGND +1.5V. In most cases,
digital inputs will be connected directly to VDD 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
VDISP
The VDISP input sets the peak-to-peak LCD drive volt-
age. In the 40-pin package, VDISP is connected internally
to DGND, providing a typical LCD drive voltage of 5 VP-P.
The 44-pin package includes a separate VDISP input for
applications requiring a variable or temperature-compen-
sated LCD drive voltage. See the applications information
for suggested 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 dou-
bler, as shown in Figure 13. The voltage doubler uses the
TC7660 and two external capacitors. With this configura-
tion measurements can be referenced either to Analog
Common or to battery ground.
Figure 12. Powering the TC820 From a Single 9V Battery
TC820
VIN
V –
REF
VDD
V
+
REF
COM
V
+
IN
V –
IN
VSS
+
–
9V
+
–
VDD
V
SS
V
+
REF
V
–
REF
TC820
3.5V to 6V
TC7660
V
IN
V
IN
+
–
+
–
V
IN
10
F
3
4
2
8
5
10
F
+
COM
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