- 您現在的位置：買賣IC網 > PDF目錄373945 > AD8369 (Analog Devices, Inc.) 45 dB Digitally Controlled VGA LF to 600 MHz PDF資料下載
參數資料
| 型號： | AD8369 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 45 dB Digitally Controlled VGA LF to 600 MHz |
| 中文描述： | 45分貝的數字控制VGA低頻至600兆赫 |
| 文件頁數： | 15/24頁 |
| 文件大?。?/td> | 968K |
| 代理商： | AD8369 |
REV. 0
AD8369
–15–
0.1 F
R
L
0.1 F
0.1 F
R
L
0.1 F
CONTROL INTERFACE
9
10
11
FILT
12
13
14
15
16
INHI COMM
PWUP VPOS SENB
CMDC OPHI
INLO
1
DENB
7
COMM BIT0
2
BIT1
4
BIT2
5
BIT3
6
AD8369
OPLO
0.1 F
8
3
0.1 F
0.1 F
3V TO 5.5V
TC4-1W
50 TX LINE
IN
V
S
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
m
F 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:
R
R
OUTPUT
R
R
SOURCE
INPUT
LOAD
=
(
=
(
)
)
a
a
For a 50
W
source, = 0.25. Then the load resistance for zero
sensitivity to variations must be 800
W
. Put more simply:
(
R
R
R
R
SOURCE
LOAD
INPUT
OUTPUT
)(
)
=
(
)(
)
=
200
2
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 log
10
(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
R
L
0.1 F
CONTROL INTERFACE
SOURCE
9
10
11
FILT
12
13
14
15
16
INHI COMM
PWUP VPOS SENB
CMDC OPHI
INLO
1
DENB
7
COMM BIT0
2
BIT1
4
BIT2
5
BIT3
6
AD8369
OPLO
0.1 F
0.1 F
V
S
8
3
0.1 F
50
0.1 F
0.1 F
Figure 4. Single-Ended-to-Differential Application Example
相關PDF資料 |
PDF描述 |
|---|---|
| AD8369ARU | 45 dB Digitally Controlled VGA LF to 600 MHz |
| AD8369ARU-REEL7 | 45 dB Digitally Controlled VGA LF to 600 MHz |
| AD8370 | LF to 750 MHz Digitally Controlled VGA |
| AD8370-EVAL | LF to 750 MHz Digitally Controlled VGA |
| AD8370ARE | LF to 750 MHz Digitally Controlled VGA |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8369ARM | 制造商:Analog Devices 功能描述:500 MHZ DIGITAL VGA - Bulk |
| AD8369ARU | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Single 5.5V 16-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:TSSOP IF DIGITAL CONTROL VGA - Bulk 制造商:Analog Devices 功能描述:IC SEMICONDUCTOR ((NS)) |
| AD8369ARU-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD8369ARU-REEL7 | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Single 5.5V 16-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:TSSOP IF DIGITAL CONTROL VGA - Tape and Reel |
| AD8369ARUZ | 功能描述:IC AMP VGA 16TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
發布緊急采購，3分鐘左右您將得到回復。