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參數(shù)資料
| 型號： | AD8328ACPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DRIVE CABLE 5V 20-LFCSP |
| 產(chǎn)品變化通告： | AD8328 Discontinuation 02/Mar/2012 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 線路驅(qū)動器，發(fā)射器 |
| 應(yīng)用： | 調(diào)制解調(diào)器，機頂盒 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 管件 |
AD8328
Rev. A | Page 13 of 20
DIFFERENTIAL SIGNAL SOURCE
Typical applications for the AD8328 use a differential input
signal from a modulator or a DAC. See Table 7 for common
values of R4, or calculate other input configurations using
Equation 2. This circuit configuration will give optimal
distortion results due to the symmetric input signals. Note
that this configuration was used to characterize the AD8328.
IN
Z
R4
×
=
kΩ
1.6
kΩ
1.6
(2)
VIN+
VIN–
R4
AD8328
ZIN
0
31
58
-0
21
Figure 21. Differential Circuit
DIFFERENTIAL SIGNAL FROM SINGLE-ENDED
SOURCE
The default configuration of the evaluation board implements
a differential signal drive from a single-ended signal source.
This configuration uses a 1:1 balun transformer to approximate
a differential signal. Because of the nonideal nature of real
transformers, the differential signal is not purely equal and
opposite in amplitude. Although this circuit slightly sacrifices
even-order harmonic distortion due to asymmetry, it does
provide a convenient way to evaluate the AD8328 with a single-
ended source.
The AD8328 evaluation board is populated with a TOKO
617DB-A0070 1:1 for this purpose (T1). Table 7 provides
typical R4 values for common input configurations. Other input
impedances can be calculated using Equation 3. See Figure 26
for a schematic of the evaluation board. To use the transformer
for converting a single-ended source into a differential signal,
the input signal must be applied to VIN+.
IN
Z
R4
×
=
kΩ
1.6
kΩ
1.6
(3)
R4
AD8328
0
315
8-
02
2
VIN+
ZIN
Figure 22. Single-to-Differential Circuit
SINGLE-ENDED SOURCE
Although the AD8328 was designed to have optimal DOCSIS
performance when used with a differential input signal, the
AD8328 can also be used as a single-ended receiver, or an IF
digitally controlled amplifier. However, as with the single-
ended-to-differential configuration previously noted, even-
order harmonic distortion is slightly degraded.
When operating the AD8328 in a single-ended input mode,
On the AD8328 evaluation boards, this termination method
requires the removal of R2 and R3 to be shorted with R4 open,
as well as the addition of 82.5 Ω at R1 and 39.2 Ω at R17 for
75 Ω termination. Table 7 shows the correct values for R11
and R12 for some common input configurations. Other input
impedance configurations can be accommodated using
Equation 4 and Equation 5.
IN
Z
R
×
=
800
1
(4)
IN
Z
R
Z
R
+
×
=
1
17
(5)
R1
R17
AD8328
03
15
8-
02
3
VIN+
ZIN
Figure 23. Single-Ended Circuit
Table 7. Common Matching Resistors
Differential Input Termination
ZIN (Ω)
R2/R3
R4 (Ω)
R1/R17
50
Open
51.1
Open/Open
75
Open
78.7
Open/Open
100
Open
107.0
Open/Open
150
Open
165.0
Open/Open
Single-Ended Input Termination
ZIN (Ω)
R2 (Ω)/R3 (Ω)
R4 (Ω)
R1 (Ω)/R17 (Ω)
50
0/0
Open
53.6/25.5
75
0/0
Open
82.5/39.2
OVERSHOOT ON PC PRINTER PORTS
The data lines on some PC parallel printer ports have excessive
overshoot that can cause communication problems when
presented to the CLK pin of the AD8328. The evaluation
board was designed to accommodate a series resistor and
shunt capacitor (R2 and C5 in Figure 26) to filter the CLK
signal if required.
INSTALLING VISUAL BASIC CONTROL SOFTWARE
Install the CabDrive_28 software by running the setup.exe file
on Disk One of the AD8328 evaluation software. Follow the on-
screen directions and insert Disk Two when prompted. Choose
the installation directory and then select the icon in the upper
left to complete the installation.
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| AD8328ACPZ-REEL | 功能描述:IC LINE DRIVE CBLE 5V 20LFCSP TR RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
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| AD8328ARQ-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:5 V Upstream Cable Line Driver |
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