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參數(shù)資料
| 型號(hào)： | AD8328ARQ |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | 5 V Upstream Cable Line Driver |
| 中文描述： | LINE DRIVER, PDSO20 |
| 封裝： | QSOP-20 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 542K |
| 代理商： | AD8328ARQ |
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REV. 0
AD8328
–9–
states,
“
Spurious emissions from a transmitted carrier may occur
in an adjacent channel that could be occupied by a carrier of the
same or different symbol rates.
”
TPC 3 shows the measured
ACP for a 60 dBmV QPSK signal taken at the output of the
AD8328 evaluation board. The transmit channel width and adja-
cent channel width in TPC 3 correspond to the symbol rates of
160 kSym/s. Table I shows the ACP results for the AD8328
driving a QPSK, 60 dBmV signal for all conditions in DOCSIS
Table 6-9,
Adjacent Channel Spurious Emissions
.
Noise and DOCSIS
At minimum gain, the AD8328 output noise spectral density is
1.2 nV/
√
Hz
measured at 10 MHz. DOCSIS Table 6-10,
Spurious
Emissions in 5 MHz to 42 MHz
, specifies the output noise for
various symbol rates. The calculated noise power in dBmV for
160 kSym/s is:
20
1.
160
60
66 4
2
×
×
+
=
log
–
.
nV
Hz
kHz
dBmV
Comparing the computed noise power of
–
66.4 dBmV to the
+8 dBmV signal yields
–
74.4 dBc, which meets the required level
set forth in DOCSIS Table 6-10. As the AD8328 gain is increased
above this minimum value, the output signal increases at a
faster rate than the noise, resulting in a signal-to-noise ratio that
improves with gain. In transmit disable mode, the output noise
spectral density is 1.1 nV/
√
Hz
, which results in
–
67 dBmV when
computed over 160 kSym/s. The noise power was measured
directly at the output of the AD8328AR-EVAL board.
Evaluation Board Features and Operation
The AD8328 evaluation board and control software can be used
to control the AD8328 upstream cable driver via the parallel port
of a PC. A standard printer cable connected to the parallel port
of the PC is used to feed all the necessary data to the AD8328
using the Windows
-based control software. This package pro-
vides a means of controlling the gain and the power mode of the
AD8328. With this evaluation kit, the AD8328 can be evaluated
in either a single-ended or differential input configuration. A
schematic of the evaluation board is provided in Figure 11.
Differential Signal Source
Typical applications for the AD8328 use a differential input signal
from a modulator or a DAC. See Table II for common values of
R4, or calculate other input configurations using the equation in
Figure 6. This circuit configuration will give optimal distortion
results due to the symmetric input signals. It should be noted that
this is the configuration that was used to characterize the AD8328.
R
Z
1 6
.
k
k
Z
IN
IN
4
1 6
×
.
–
=
V
IN
+
AD8328
V
IN
–
R4
Z
IN
Figure 6. 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 trans-
formers, 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 con-
venient 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 II provides
typical R4 values for common input configurations. Other input
impedances may be calculated using the equation in Figure 7.
Refer to Figure 10 for an evaluation board schematic. To utilize
the transformer for converting a single-ended source into a
differential signal, the input signal must be applied to V
IN+
.
R
Z
1 6
.
k
k
Z
IN
IN
4
1 6
×
.
–
=
V
IN
AD8328
R4
Z
IN
Figure 7. 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 may also be used as a single-ended receiver, or an IF
digitally controlled amplifier. However, as with the single-ended
to differential configuration noted above, even order harmonic
distortion will be slightly degraded.
When operating the AD8328 in a single-ended input mode,
V
IN+
and V
IN
–
should be terminated as illustrated in Figure 8.
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
at R1 and 39.2
at R17 for 75
termination. Table II shows the correct values for R11 and
R12 for some common input configurations. Other input
impedance configurations may be accommodated using the
equations in Figure 8.
R
Z
800
Z
R
Z
R
R
Z
IN
IN
IN
1
IN
1
800
17
1
=
×
–
=
×
+
AD8328
R1
R17
V
IN
+
Z
IN
Figure 8. Single-Ended Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8328ACP-REEL | 5 V Upstream Cable Line Driver |
| AD8328ARQ-REEL | 5 V Upstream Cable Line Driver |
| AD8330 | Low Cost DC-150 MHz Variable Gain Amplifier |
| AD8330ACP | Low Cost DC-150 MHz Variable Gain Amplifier |
| AD8330ACP-REEL7 | Low Cost DC-150 MHz Variable Gain Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8328ARQ-EVAL | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:5 V Upstream Cable Line Driver |
| AD8328ARQ-REEL | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 20-Pin QSOP T/R |
| AD8328ARQZ | 功能描述:IC LINE DRIVE CABLE 5V 20-QSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 線(xiàn)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(lèi)型:調(diào)諧器 應(yīng)用:移動(dòng)電話(huà)，手機(jī)，視頻顯示器 安裝類(lèi)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(chēng):SP000365064 |
| AD8328ARQZ-REEL | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 20-Pin QSOP T/R 制造商:Rochester Electronics LLC 功能描述:QSOP LOW COST +5V CABLE LINE DRIVER - Tape and Reel 制造商:Analog Devices 功能描述:IC,Digitally Controlled Gain Amplifier,SINGLE,SSOP,20PIN,PLASTIC |
| AD8330 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Cost, DC to 150 MHz Variable Gain Amplifier |
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