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參數(shù)資料
| 型號： | HFA1205IP |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.5V 144-mc CPLD - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDIP8 |
| 封裝： | PLASTIC, MS-001BA, DIP-8 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HFA1205IP |
5
Non-inverting Input Source Impedance
For best operation, the DC source impedance seen by the
non-inverting input should be
≥
50
.
This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
PC Board Layout
The frequency response of this amplifier depends greatly on
the amount of care taken in designing the PC board.
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.
Care must also be taken to minimize the capacitance to
ground seen by the amplifier’s inverting input (-IN). The
larger this capacitance, the worse the gain peaking, resulting
in pulse overshoot and possible instability. To this end, it is
recommended that the ground plane be removed under
traces connected to -IN, and connections to -IN should be
kept as short as possible.
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 280MHz (for A
V
= +1). 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
= +1, R
S
= 62
, C
L
= 40pF,
the overall bandwidth is limited to 180MHz, and bandwidth
drops to 70MHz at A
V
= +1, R
S
= 8
, C
L
= 400pF.
Evaluation Board
The performance of the HFA1205 may be evaluated using
the HA5023 Evaluation Board. The feedback and gain
setting resistors must be replaced with the appropriate value
(see “Optimum Feedback Resistor” section) for the gain
being evaluated. Also, replace the two 0
series output
resistors with 50
resistors.
To order evaluation boards (Part Number HA5023EVAL),
please contact your local sales office.
0
100
200
300
400
0
10
20
30
40
50
LOAD CAPACITANCE (pF)
S
)
A
V
= +2
150
250
350
50
A
V
= +1
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
LOAD CAPACITANCE
HFA1205
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