The VIN+ and V
參數(shù)資料
型號(hào)： AD8326AREZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 3/24頁(yè)
文件大?。?/td> 0K
描述： IC LINE DVR CATV PROG 28TSSOP
產(chǎn)品變化通告： AD8326 Series Discontinuation 28/Feb/2012
標(biāo)準(zhǔn)包裝： 50
類(lèi)型： 線(xiàn)路驅(qū)動(dòng)器，發(fā)射器
應(yīng)用： CATV
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-SOIC（0.173"，4.40mm 寬）裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 28-HTSSOP
包裝： 管件
REV. 0
AD8326
–11–
Input Bias, Impedance, and Termination
The VIN+ and VIN– inputs have a dc bias level of approxi-
mately 1.47 V below VCC/2, therefore the input signal should
be ac-coupled using 0.1
F capacitors as seen in the typical
application circuit (see Figure 5).
The differential input impedance of the AD8326 is approxi-
mately 1600
, while the single-ended input is 800 .
Single-Ended Inverting Input
When operating the AD8326 in a single-ended input mode VIN+
and VIN– should be terminated as illustrated in Figure 6. On the
AD8326 evaluation boards, this termination method requires the
removal of R12, R13, R14, R16, R17, and R18. Install a 0
jumper at R15, an 82.5
resistor at R10 for a 75 system, and a
39.2
resistor at R11 to balance the inputs of the AD8326
evaluation board (Figure 11). Other input impedance configura-
tions may be calculated using the equations in Figure 6.
AD8326
R10
R11
+
–
ZIN = R10||800
R11 = ZIN||R10
VIN–
Figure 6. Single-Ended Input Impedance
The inverting and noninverting inputs of the AD8326 must be
balanced for all input configurations.
Differential Input from Single-Ended Source
The default configuration of the evaluation board implements a
differential signal drive from a single-ended signal source. A
Toko 1:1 transformer is included on the board for this purpose
(T3). Enabling the evaluation board for single to differential
input conversion requires R15–R17 to be removed, and 0
jumpers must be installed on the placeholders for R13, R14, and
R18. For a 75
input impedance, R12 should be 78.7 . Refer
to Figure 11 for evaluation board schematic. In this configuration,
the input signal must be applied to VIN–. Other input imped-
ances may be calculated using the equation in Figure 7.
VIN–
AD8326
DESIRED IMPEDANCE = R12||1600
R12
Figure 7. Differential Signal from Single-Ended Source
Differential Signal Source
The AD8326 evaluation board is also capable of accepting a
differential input signal. This requires the installation of a 165
resistor in R12, the removal of R13–R14, R17–R18, and the
installation of 0
jumpers for R15–R16. This configuration
results in a differential input impedance of 150
. Other differ-
ential input impedance configurations may be calculated with
the equation in Figure 8.
VIN+
AD8326
VIN–
R12
DESIRED IMPEDANCE = R12||1600
Figure 8. Differential Input
DATEN
SDATA
CLK
GND1
VCC
TXEN
SLEEP
GND
VCC
VEE
GND
VEE
VOUT–
GND
VCC
VIN–
VIN+
VEE
VCC
VEE
BYP
VCC
VEE
GND
VEE
VOUT+
AD8326
VEE
TXEN
DATEN
SDATA
CLK
10 F
0.1 F
TOKO 617DB-A0070
TO DIPLEXER
ZIN = 75
0.1 F
165
VIN–
VIN+
ZIN = 150
10 F
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SLEEP
0.1 F
Figure 5. Typical Applications Circuit
OBSOLETE
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