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参数资料
| 型号： | 5962-9169301MCA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 4 CHANNEL, VIDEO AMPLIFIER, CDIP14 |
| 封装： | CERDIP-14 |
| 文件页数： | 12/14页 |
| 文件大小： | 353K |
| 代理商： | 5962-9169301MCA |
Application Division
Feedback Resistor
The CLC414 achieves its exceptional AC performance while
requiring very low quiescent power by using the current
feedback topology and an internal slew rate enhancement
circuit. The loop gain and frequency response for a current
feedback op amp is predominantly set by the feedback
resistor value. The CLC414 is optimized for a gain of +6 to
use a 500
feedback resistor (use a 1k R
f for maximally
flat response at a gain of +2). Using lower values can lead
to excessive ringing in the pulse response while a higher
value will limit the bandwidth. Application Note OA-13 pro-
vides a more detailed discussion of choosing a feedback
resistor. The equations found in this application note are to
be considered a starting point for the determination of R
f at
any gain. The value of input impedance of the CLC414 is
approximately 250
. These equations do not account for
parasitic capacitance at the inverting input nor across R
f.
The plot found below entitled “Recommended R
f vs. Gain”
offers values of R
f which will optimize the frequency re-
sponse of the CLC414 over its ±1to ±10 gain range. Unlike
voltage feedback, current feedback op amps require a
non-zero R
f for unity gain followers.
Unused Amplifiers
It is recommended that any unused amplifiers in the quad
package be connected as unity gain followers (R
f = 500)
with the non-inverting input tied to ground through a 50
resistor.
Slew Rate and Harmonic Distortion
Please see the application information for the CLC406.
Differential Gain and Phase
Differential gain and phase performance specifications are
common to composite video distribution applications. These
specifications refer to the change in small signal gain and
phase of the color subcarrier frequency (4.43MHz for PAL
composite video) as the amplifier output is swept over a
range of DC voltages. Application Note OA-08 provides an
additional discussion of differential gain and phase measure-
ments.
Non-inverting Source Impedance
For best operation, the DC source impedance looking out of
the non-inverting input should be less than 3k
but greater
than 20
. Parasitic self oscillations may occur in the input
transistors if the DC source impedance is out of this range.
This impedance also acts as the gain for the non-inverting
input bias and noise currents and therefore can become
troublesome for high values of DC source impedance. The
inverting configuration of
Figure 2 shows a 25
resistor to
ground on the non-inverting input which insures stability but
does not provide bias current cancellation. The input bias
currents are unrelated for a current feedback amplifier which
eliminates the need for source impedance matching to
achieve bias current cancellation.
DC Accuracy and Noise Calculation
Please refer to the application information for the CLC406.
Crosstalk
In any multi-channel integrated circuit there is an undesir-
able tendency for the signal in one channel to couple with
and reproduce itself in the output of another channel. This
effect is referred to as crosstalk. Crosstalk is expressed as
channel separation or channel isolation which indicates the
01275013
FIGURE 1. Recommended Non-Inverting Gain Circuit
01275014
FIGURE 2. Recommended Inverting Gain Circuit
01275019
FIGURE 3. Recommended R
f vs. Gain
CLC414
www.national.com
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