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參數(shù)資料
| 型號： | ICL7149 |
| 廠商： | Intersil Corporation |
| 英文描述： | Quad LVDS Receiver with -4 to 5V Common-mode Range 24-TSSOP -40 to 85 |
| 中文描述： | 33 / 4位，自動量程萬用表 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 111K |
| 代理商： | ICL7149 |
3-44
Reference Voltage Source
A voltage divider connected to V+ and Common is the sim-
plest source of reference voltage. While minimizing external
component count, this approach will provide the same volt-
age tempco as the ICL7139 and ICL7149 Common - about
100PPM/
o
C. To improve the tempco, an ICL8069 bandgap
reference may be used (see Figure 13). The reference volt-
age source output impedance must be
≤
R
DElNT
/4000.
Applications, Examples, and Hints
A complete autoranging 3
3
/
4
digit multimeter is shown in
Figure 14. The following sections discuss the functions of
specific components and various options.
Meter Protection
The ICL7139 and ICL7149 and their external circuitry should
be protected against accidental application of 110/220V AC
line voltages on the
and current ranges. Without the nec-
essary precautions, both the ICL7139 and ICL7149 and their
external components could be damaged under such fault
conditions. For the current ranges, fast-blow fuses should be
used between S5A in Figure 14 and the 0.1
and 9.9
shunt resistors. For the
ranges, no additional protection
circuitry is required. However, the 10k
resistor connected
to pin 7 must be able to dissipate 1.2W or 4.8W for short
periods of time during accidental application of 110V or
220V
AC
line voltages respectively.
DEINTEGRATE
INTEGRATE VOLT/
INTEGRATE CURRENT
REFERENCE INPUT
ANALOG COMMON
TRIPLE POINT
EXTERNAL
REFERENCE
10M
10K
1M
10M
10K
ICL8069
V+
FIGURE 13. EXTERNAL VOLTAGE REFERENCE CONNECTION
TO ICL7139 AND ICL7149
13
14
15
DEINT
INT (V/
)
COMMON
LO
TRIPLE
POINT
10M
HI
INT (I)
V/
/A
mA/
μ
A
ICL7139
ICL7149
HOLD
HI
-DC/LO
-AC
V
REF
V-
V+
BEEPER
DISPLAY
DRIVE
OUTPUTS
C
AZ
C
INT
OSC
OUT
OSC
IN
1-3
23-40
BEEPER
INPUTS
V/
S4A
V
A
μ
A
mA
S5A
9
12
7
8
11
10
18
17
COMMON
V+
V+
V-
μ
A
A
V
mA
S4B
10k
1M
1M
9.9
10M
A
0.1
2W
20
S3
19
S3
V+
V+
6
5
4
16
1
μ
F
ON/OFF
S1
9V
BATTERY
TANT
4.7
μ
F
PIN 4
ICL8069
PIN 10
LO BAT
AC
mAV
μ
A
10k
120kHz
CRYSTAL
0.1
μ
F
3.3nF
21
22
k
M
30K-
50K
+
+
+
-
10k
S2 CLOSED: HI
-DC
S3 CLOSED: HOLD READING
NOTES:
1. Crystal is a Statek or SaRonix CX-IV type.
2. Multimeter protection components have not been shown.
3. Display is from LXD, part number 38D8R02H (or Equivalent).
4. Beeper is from muRata, part number PKM24-4A0 (or Equivalent).
FIGURE 14. BASIC MULTIMETER APPLICATION CIRCUIT FOR ICL7139 AND ICL7149
ICL7139, ICL7149
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