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參數(shù)資料
| 型號(hào)： | HFA1412 |
| 廠商： | Intersil Corporation |
| 英文描述： | Quad, 350MHz, Low Power, Programmable Gain Buffer Amplifier(四路、350MHz低功耗可編程增益緩沖器放大器) |
| 中文描述： | 四，350MHz的，低功耗，可編程增益緩沖放大器（四路，350MHz的低功耗可編程增益緩沖器放大器） |
| 文件頁數(shù)： | 6/13頁 |
| 文件大小： | 332K |
| 代理商： | HFA1412 |
6
FN4152.4
January 23, 2006
PC Board Layout
This amplifier’s frequency response depends greatly on the
care taken in designing the PC board (PCB).
The use of low
inductance components such as chip resistors and chip
capacitors is strongly recommended, while a solid
ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10
μ
F) tantalum in parallel with a small value
(0.1
μ
F) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
input and output of the device. Capacitance directly on the
output must be minimized, or isolated as discussed in the
next section.
An example of a good high frequency layout is the
Evaluation Board shown in Figure 3.
Driving Capacitive Loads
Capacitive loads, such as an A/D input, or an improperly
terminated transmission line will degrade the amplifier’s
phase margin resulting in frequency response peaking and
possible oscillations. In most cases, the oscillation can be
avoided by placing a resistor (R
S
) in series with the output
prior to the capacitance.
Figure 1 details starting points for the selection of this
resistor. The points on the curve indicate the R
S
and C
L
combinations for the optimum bandwidth, stability, and
settling time, but experimental fine tuning is recommended.
Picking a point above or to the right of the curve yields an
overdamped response, while points below or left of the curve
indicate areas of underdamped performance.
R
S
and C
L
form a low pass network at the output, thus limiting
system bandwidth well below the amplifier bandwidth of
350MHz. By decreasing R
S
as C
L
increases (as illustrated in
the curves), the maximum bandwidth is obtained without
sacrificing stability. In spite of this, bandwidth decreases as
the load capacitance increases. For example, at A
V
= +2,
R
S
= 22
, C
L
= 100pF, the overall bandwidth is 125MHz, and
bandwidth drops to 100MHz at R
S
= 12
, C
L
= 220pF.
Evaluation Board
The performance of the HFA1412 may be evaluated using
the HA5025 Evaluation Board, slightly modified as follows:
1. Remove the four feedback resistors, and leave the
connections open.
2. a. For A
V
= +1 evaluation, remove the gain setting
resistors (R
1
), and leave pins 2, 6, 9, and 13 floating.
b. For A
V
= +2, replace the gain setting resistors (R
1
) with
0
resistors to GND.
3. Replace the 0
series output resistors with 50
.
The modified schematic for amplifier 1, and the board layout
are shown in Figures 2 and 3.
To order evaluation boards (part number HA5025EVAL),
please contact your local sales office.
0
100
200
300
400
0
10
20
30
40
50
LOAD CAPACITANCE (pF)
S
)
A
V
= +1
A
V
= +2
150
250
350
50
FIGURE 1. RECOMMENDED SERIES RESISTOR vs LOAD
CAPACITANCE
+5V
10
μ
F
0.1
μ
F
50
GND
GND
R
1
-5V
0.1
μ
F
10
μ
F
50
IN
OUT
∞
(A
V
= +1)
or 0
(A
V
= +2)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NOTE: R
1
=
FIGURE 2. MODIFIED EVALUATION BOARD SCHEMATIC
+
(NOTE)
FIGURE 3A. TOP LAYOUT
FIGURE 3B. BOTTOM LAYOUT
FIGURE 3. EVALUATION BOARD LAYOUT
HFA1412
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| HFA1412IBZ | 功能描述:特殊用途放大器 W/ANNEAL BUFR 4X 350 MHZ PRG GAIN 14 IND RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| HFA1412IP | 功能描述:IC BUFFER QUAD 350MHZ LP 14-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
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