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參數(shù)資料
| 型號： | CPC5712U |
| 廠商： | CLARE INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封裝： | ROHS COMPLIANT, QSOP-16 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 387K |
| 代理商： | CPC5712U |
CPC5712
R00G
www.clare.com
8
3.2 Voltage Detector Design
From the application requirements given above, the
desired LIU detector threshold voltages are therefore:
V
H2 = 15V
V
L2 = 12V
and the detector thresholds for the LOOP detector are:
V
H1 = 5V
V
L1 = 3V
3.2.1 Calculate Resistor Values
From the design equations provided in
page 6 this gives:
R1=R1
R2=0.666667 R1
R3=2.333333 R1
R4=R1
R5=5.125558 R1
Summing these equations provides the following
result:
R1+R2+R3+R4+R5 = 10.12556 R1
and since this sum is bound by:
20k
< (R1 + R2 + R3 + R4 + R5) < 1M
this reduces to: 20k
< (10.12556 R1) < 1M.
Taking into account the additional constraint of resistor
tolerance, 1% in this example, the range of allowable
values for R1 is further reduced and becomes:
1.995k
< R1 < 97.782k permitting a value
for R1 to be chosen.
Selecting a standard value from the E96, 1% table for
R1 of 26.7k
, the calculated values for the remaining
resistors becomes:
R2=17.8k
R3=62.3k
R4=26.7k
R5=136.85k
Since the calculated values of R3 and R5 are not
standard values, a reasonable compromise for these
resistors is: R3=61.9k
and R5=137k. See
3.2.2 Verify Resistor Selection
Once the resistor values are chosen it is necessary to
back calculate the nominal detector thresholds.
To do this the following equations are provided for two
variables:
where R∑ is the sum of the resistive interface network
and RREF is the sum of the resistor divider network on
the reference voltage output.
The following values are also needed to perform the
threshold calculations. They are:
V
REF = 1.5V
R
IN1 = RIN2 = 2 x 10M = 20M
R
DIFF = 806k
G=2.5
which gives:
R∑ = 40.806M
and
R
REF = 270.1k
The threshold equations are:
1.
2.
3.
4.
Using the selected standard 1% resistor values, and
back calculating to the threshold voltages produces
these results:
V
L1 = 3.00280V
V
H1 = 5.00467V
V
L2 = 11.9662V
V
H2 = 14.9690V
As can be seen, the error from using standard value
resistors is less than 0.1% for VL1 and VH1 and is less
than 0.3% for VL2 and VH2.
RΣ
RIN1 RIN2 RDIFF
++
=
RREF
R1 R2 R3 R4 R5
++++
=
VL1
VREF RΣ R1
GRDIFF RREF
----------------------------------------
=
VH1
VREF RΣ R1 R2
+
()
GRDIFF RREF
-----------------------------------------------------
=
VL2
VREF RΣ R1 R2 R3
++
()
GRDIFF RREF
------------------------------------------------------------------
=
VH2
VREF RΣ R1 R2 R3 R4
+++
()
GRDIFF RREF
--------------------------------------------------------------------------------
=
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