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参数资料
| 型号： | CA3280E |
| 厂商： | HARRIS SEMICONDUCTOR |
| 元件分类： | 运动控制电子 |
| 英文描述： | Dual, 9MHz, Operational Transconductance Amplifier (OTA) |
| 中文描述： | DUAL OP-AMP, 4000 uV OFFSET-MAX, 9 MHz BAND WIDTH, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 5/10页 |
| 文件大小： | 286K |
| 代理商： | CA3280E |
5
Application Information
Figures 4 and 5 show the equivalent circuits for the current
source and linearization diodes in the CA3280. The current
through the linearization network is approximately equal to the
programming current. There are several advantages to driving
these diodes with a current source. First, only the offset current
from the biasing network flows through the input resistor.
Second, another input is provided to extend the gain control
dynamic range. And third, the input is truly differential and can
accept signals within the common mode range of the CA3280.
Typical Applications
The structure of the variable operational amplifier eliminates
the need for matched resistor networks in differential to single
ended converters, as shown in Figure 6. A matched resistor
network requires ratio matching of 0.01% or trimming for 80dB
of common-mode rejection. The CA3280, with its excellent
common mode rejection ratio, is capable of converting a small
(
±
25mV) differential input signal to a single-ended output
without the need for a matched resistor network.
Figure7 showsthe CA3280 inatypicalgain control application.
Gain control can be performed with the amplifier bias current
(l
ABC
). With no diodebias current, the gain is merely g
M
R
L
.For
example, with an l
ABC
of 1mA, the g
M
is approximately 16mS.
With the CA3280 operating into a 5k
resistor, the gain is 80.
The need for external buffers can be eliminated by the use of
low value load resistors, but the resulting increase in the
required amplifier bias current reduces the input impedance
FIGURE 3A. EFFECTS OF DIODE LINEARIZATION, WITH DIODE PROGRAMMING TERMINAL ACTIVE
FIGURE 3B. WITH DIODE PROGRAMMING TERMINAL CUTOFF
FIGURE 3. CA3280 TRANSFER CHARACTERISTICS
Test Circuits and Waveforms
(Continued)
1/2
CA3280
13
1
14
4
3
15
16
15V
I
DIODE
I
ABC
-15V
1k
V+
10k
10k
V-
I
OUT
V
IN
I
ABC
= 650
μ
A, I
D
= 200
μ
A; Vertical = 200
μ
A/Div.;
Horizontal = 1V/Div.
1/2
CA3280
12
8
11
6
4
10
9
15V
I
DIODE
I
ABC
1k
V+
10k
10k
-15V
V-
I
OUT
V
IN
I
ABC
= 650
μ
A; I
D
= 0; Vertical = 200
μ
A/Div.;
Horizontal = 25mV/Div.
CA3280, CA3280A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CA3280F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Transconductance Operational Amplifier |
| CA3280F3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3282 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Octal Low Side Power Driver with Serial Bus Control |
| CA3282AS1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Octal Low Side Power Driver with Serial Bus Control |
| CA3282AS2 | 制造商:harris/intersil 功能描述: 制造商:Harris Corporation 功能描述: |
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