RL 0.1 F RL 0.1 F CONTROL INTER" />
參數(shù)資料
型號(hào)： AD8369ARUZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/24頁(yè)
文件大小： 0K
描述： IC AMP VGA 16TSSOP
標(biāo)準(zhǔn)包裝： 96
系列： X-AMP®
放大器類型： 可變?cè)鲆?br>
電路數(shù)： 1
轉(zhuǎn)換速率： 1200 V/µs
-3db帶寬： 600MHz
電流 - 輸入偏壓： 160µA
電流 - 電源： 37mA
電壓 - 電源，單路/雙路(±)： 3 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 管件
產(chǎn)品目錄頁(yè)面： 775 (CN2011-ZH PDF)
REV. 0
AD8369
–15–
0.1 F
RL
0.1 F
RL
0.1 F
CONTROL INTERFACE
9
10
11
12
13
14
15
16
PWUP VPOS SENB
FILT CMDC OPHI
INHI COMM
INLO
DENB
COMM BIT0
BIT1
BIT2
BIT3
AD8369
OPLO
0.1 F
8
7
6
5
4
3
2
1
0.1 F
3V TO 5.5V
TC4-1W
50
TX LINE
IN
VS
Figure 3. Basic Connections
BASIC CONNECTIONS
Figure 3 shows the minimum connections required for basic
operation of the AD8369. Supply voltages of between +3 V and
+5.5 V are permissible. The supply to the VPOS pin should be
decoupled with at least one low inductance surface-mount ceramic
capacitor of 0.1
mF placed as close as possible to the device. More
effective decoupling is provided by placing a 100 pF capacitor in
parallel and including a 4.7
W resistor in series with the supply.
Attention should be paid to voltage drops. A ferrite bead is a
better choice than the resistor where a smaller drop is required.
Input-Output Interface
A broadband 50
W input termination can be achieved by
using a 1:2 turns-ratio transformer, as shown in Figure 3.
This also can be used to convert a single-ended input signal
to a balanced differential form at the inputs of the AD8369.
As in all high frequency applications, the trace impedance
should be maintained right up to the input pins by careful
design of the PC board traces, as described in the PCB
Layout Considerations section.
Reducing Gain Sensitivity to Input and Output Impedance
Variation
The lot-to-lot variations in gain mentioned previously can, in
principle, be eliminated by adjustments to the source and load.
Define a term
as a function of the input and output resistances
of the AD8369 and the source and load resistances presented to it:
RR
SOURCE
INPUT
OUTPUT
LOAD
=
()
=
()
a
For a 50
W source, = 0.25. Then the load resistance for zero
sensitivity to variations must be 800
W. Put more simply:
RR
R
SOURCE
LOAD
INPUT
OUTPUT
()(
) = ()(
) = 2002
In general, there is a loss factor, 1/(1+ ), at each interface so
the overall gain reduction due to source and output loading is
40 log10 (1 + ). In this case, the input and output loss factors
are 0.8 (1.94 dB) at each interface so the overall gain is
reduced by 3.88 dB.
Operation from a Single-Sided Source
While there are distinct benefits of driving the AD8369 with a
well-balanced input, in terms of distortion and gain conform-
ance at high frequencies, satisfactory operation will often be
possible when a single-sided source is ac-coupled directly to pin
INHI, and pin INLO is ac-grounded via a second capacitor. This
mode of operation takes advantage of the good HF common-mode
rejection of the input system. The capacitor values are, as always,
selected to ensure adequate transmission at low frequencies.
0.1 F
RL
0.1 F
CONTROL INTERFACE
SOURCE
9
10
11
12
13
14
15
16
PWUP VPOS SENB
FILT CMDC OPHI
INHI COMM
INLO
DENB
COMM BIT0
BIT1
BIT2
BIT3
AD8369
OPLO
0.1 F
VS
8
7
6
5
4
3
2
1
0.1 F
50
0.1 F
Figure 4. Single-Ended-to-Differential Application Example
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8369ARUZ-REEL7 功能描述:IC AMP VGA 16TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件
AD8369EVAL 制造商:AD 制造商全稱:Analog Devices 功能描述:45 dB Digitally Controlled VGA LF to 600 MHz
AD8369-EVAL 制造商:Analog Devices 功能描述:AD8369 EVALUATION BOARD - Bulk
AD8369-EVALZ 制造商:Analog Devices 功能描述:EVALUATION BOARD - Boxed Product (Development Kits)
AD8370 制造商:AD 制造商全稱:Analog Devices 功能描述:LF to 750 MHz Digitally Controlled VGA
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