參數(shù)資料
型號(hào)： A8281SLB
廠商： Allegro MicroSystems, Inc.
英文描述： LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS
中文描述： LNB電源與控制，電壓調(diào)節(jié)器
文件頁(yè)數(shù)： 7/14頁(yè)
文件大?。?/td> 375K
代理商： A8281SLB
8281
AND
8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
7
www.allegromicro.com
Grounding.
Use a star ground approach at the
device ground terminals. This allows the analog and
power grounds to be kept separate on the PWB up to
the device.
Noise immunity.
LNB systems can have a 50
-
mV
peak specification for noise on the coaxial cable.
This is easily achievable with proper layout and
following a few guidelines:
1. Use a low-ESR capacitor for V
BULK
. A maximum
of 200
-
m
is recommended.
2. The LNB output is sensitive to the TCAP refer-
ence terminal. Keep the PWB traces short and loca-
tion of C
TCAP
close to the device. This terminal is a
high-impedance node and noise can be induced from
proximity to an unshielded inductor. If the inductor
can not be placed far enough away to avoid noise
pickup, it is important to ensure that the induced
voltage is out of phase with the switching node LX.
Rotating the inductor can change the phase of the
induced voltage.
3. Be sure to place a 1
-
μ
F to 10
-
μ
F capacitor on
internal reference V
INT
(A8282 only).
4. Bypass EXTM with a 0.1
-
μ
F ceramic capacitor to
ground.
5. Increasing the output capacitance will attenuate
noise. However, this must be traded off with the
requiremnent for low cable capacitance for 22
-
kHz-
tone transmission.
APPLICATIONS INFORMATION (
cont’d
)
DirecTV.
With the A8282, it is possible to raise
the LNB output voltage 440
-
mV from the nominal
13
-
V setting to comply with DirecTV requirements.
This is accomplished by connecting a 1
-
M
resistor
between the VINT and TCAP terminals, sourcing
approximately 2.76
-
μ
A into the TCAP node. The
LNB output voltage is approximately six times the
setting of the voltage-select DAC as shown in the
figure.
–
+
VINT
LNB
VOLTAGE
REG.
25 k
TCAP
1
VOLTAGE
SELECT
X6
Dwg. EP-074
DiSEqC.
The 22
-
kHz tone is specified to be
compatible with EUTELSAT coaxial cable bus
standards.
The LNB output will be able to drive the DiSEqC
termination network. The inductor must pass the dc
current with minimal loss while the parallel resistor
provides the recommended source impedance at
22
-
kHz. Unidirectional communication systems such
as DiSEqC 1.0 do not need this termination and the
LNB can be directly connected to the coaxial cable.
13
-
V to 18
-
V transition.
The LNB output can be
rapidly switched between a high and a low setting as
a method of receiver-to-LNB communication. The
TCAP capacitor will control the slew rate based on
the RC charging.
t
r
or t
f
= 25 x 10
3
x C
TCAP
ln(V
LNB(H)
/V
LNB(L)
)
相關(guān)PDF資料
PDF描述
A8283 Low-Noise Block Supply and Control-Voltage Regulator(低噪聲組件,電源和控制電壓穩(wěn)壓器)
A8284 Two Output Low-Noise Block Supply and Control-Voltage Regulator(雙輸出低噪聲組件,電源和控制電壓穩(wěn)壓器)
A8285 LNB Supply and Control Voltage Regulator
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A8287 LNB Supply and Control Voltage Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
A8281SLBTR 功能描述:IC REG LNB SUPPLY/CTRL 16-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
A8282SLB 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
A8282SLB-T 制造商:Allegro MicroSystems LLC 功能描述:
A8282SLBTR 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
A8282SLBTR-T 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
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