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參數(shù)資料
| 型號(hào)： | TC820CPL |
| 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(jì)數(shù)器和邏輯探針轉(zhuǎn)爐 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TC820CPL |
3-161
TELCOM SEMICONDUCTOR, INC.
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3
1
2
8
TC820
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
To prevent roll-over-type errors from being induced by
large common-mode voltages, C
REF
should be large com-
pared to stray node capacitance. A 0.1
μ
F capacitor is
typical.
The TC820 offers a significantly improved analog
common temperature coefficient, providing a very stable
voltage suitable for use as a voltage reference. The
temperature coefficient of analog common is typically
35ppm/
°
C.
Figure 7. LCD During Logic Probe Operation
HIGH
LOW
*
**
"HIGH" ANNUNCIATOR WILL BE ON WHEN DP1/HI =
LOGIC HIGH
"LOW" ANNUNCIATOR AND BUZZER WILL BE ON
WHEN DP0/LO = LOGIC HIGH
**
*
Analog Common
The analog common pin is set at a voltage potential
approximately 3.3V below V
DD
. This potential is guaranteed
to be between 3.15V and 3.45V below V
DD
. Analog common
is tied internally to an N-channel FET capable of sinking
3mA. This FET will hold the common line at 3.3V below V
DD
should an external load attempt to pull the common line
toward V
DD
. Analog common source current is limited to
12
μ
A, and is therefore easily pulled to a more negative
voltage (i.e., below V
DD
– 3.3V).
The TC820 connects the internal V
+
analog common during the auto-zero cycle. During the
reference integrate phase, V
–
common. If V
–
a common-mode voltage exists. This is rejected by the
converter's 86dB common-mode rejection ratio. In battery-
powered applications, analog common and V
–
connected, removing common-mode voltage concerns. In
systems where V
–
or to a given voltage, analog common should be connected
to V
–
The analog common pin serves to set the analog section
reference or common point. The TC820 is specifically
designed to operate from a battery or in any measurement
IN
and V
–
inputs to
IN
is connected to analog
IN
is not externally connected to analog common,
IN
are usually
IN
is connected to the power supply ground
IN
.
TC820
GND
GND
V
+
POWER
SOURCE
V
–
V
+
V
–
MEASURED
SYSTEM
9V
V
IN
V
IN
ANALOG
COMMON
V
DD
V
SS
V
+
REF
V
–
REF
+
–
V
BUF
C
AZ
BP1
INT
V
BP3
BP2
OSC1
OSC2
OSC3 NC
SEGMENT
DRIVE
LCD
+
Figure 8. Common-Mode Voltage Removed in Battery Operation With V
–
IN
= Analog Common
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