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参数资料
| 型号： | CPC5712U |
| 厂商： | CLARE INC |
| 元件分类： | 通信及网络 |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封装： | ROHS COMPLIANT, QSOP-16 |
| 文件页数： | 8/10页 |
| 文件大小： | 387K |
| 代理商： | CPC5712U |
CPC5712
R00G
www.clare.com
7
3. Design Example
An application circuit that is based on information
discussed in Section 2.5 “Detector Threshold
Operation” on page 6 is shown in Figure 2.
In the following telephony design example, it is desired
to have a Line-In-Use (LIU) detector set at 12V with a
hysteresis of 3V, and a loop or battery-presence
(LOOP) detector set at 5V with a hysteresis of 2V. The
LIU detector will monitor the Public Switched
Telephone Network (PSTN) twisted pair TIP and RING
leads for a voltage level that indicates a device on the
line is off-hook while the LOOP detector monitors for
the presence of battery feed. In this example
detector 2 (DET2) will be the LIU detector as it has the
greater voltage detect thresholds.
Figure 2 CPC5712 Application Circuit
3.1 Line Interface
Between the CPC5712 and the TIP/RING line is a
high impedance resistive divider network that provides
sufficient impedance to meet the barrier insulation
specifications in safety regulations and comply with
the on-hook DC leakage to ground requirements from
the various network compatibility specifications.
From the individual TIP and RING leads to the IN+
and IN- are two series 10M
resistors. Note that for
most applications, the recommended standard size of
the surface-mount input resistor divider is 1206.
In practice, each 1206-size resistor is capable of
withstanding 2000V peak waveforms typical of
lightning surges on the phone line. Hence, two 1206
resistors can withstand 4000V lightning pulses.
DET1
DET2
POLARITY
+
-
IN+
IN-
OUT+
TIP
RING
OUT -
OUT+
V
CC
10
13
12
11
9
1
14
7
8
4
5
6
3
2
R1
R5
R4
R3
R2
V
REF
V
L1
V
H1
V
L2
V
H2
G = 5
CPC5712
V+
Voltage Level Detect 2
Voltage Level Detect 1
Polarity Output
+ Analog Output
Analog Output
(4)
10M
1%
1206
GND
15
16
806K
1%
26.7K
1%
137K
1%
26.7K
1%
61.9K
1%
17.8K
1%
0.1
F
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