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參數(shù)資料
| 型號： | CA3160T |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 運動控制電子 |
| 英文描述： | 4MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output |
| 中文描述： | OP-AMP, 15000 uV OFFSET-MAX, 4 MHz BAND WIDTH, MBCY8 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 926K |
| 代理商： | CA3160T |
8
Typical Applications
Voltage Followers
Operational amplifiers with very high input resistances, like
the CA3160, are particularly suited to service as voltage
followers. Figure 3 shows the circuit of a classical voltage
follower, together with pertinent waveforms using the CA3160
in a split-supply configuration.
A voltage follower, operated from a single supply, is shown in
Figure 4 together with related waveforms. This follower circuit
is linear over a wide dynamic range, as illustrated by the
reproduction of the output waveform in Figure 4B with input-
signal ramping. The waveforms in Figure 4C show that the
follower does not lose its input-to-output phase-sense, even
though the input is being swung 7.5V below ground potential.
This unique characteristic is an important attribute in both
operational amplifier and comparator applications. Figure 4C
also shows the manner in which the COS/MOS output stage
permits the output signal to swing down to the negative
supply-rail potential (i.e., ground in the case shown). The
digital-to-analog converter (DAC) circuit, described in the
following section, illustrates the practical use of the CA3160 in
a single supply voltage follower application.
9-Bit CMOS DAC
A typical circuit of a 9-bit Digital-to-Analog Converter (DAC) (see
Note6)isshowninFigure5.Thissystemcombinestheconcepts
of multiple-switch CMOS lCs, a low-cost ladder network of
discrete metal-oxide-film resistors, a CA3160 op amp connected
asafollower,andaninexpensivemonolithicregulatorinasimple
single power-supply arrangement. An additional feature of the
DAC is that it is readily interfaced with CMOS input logic, e.g.,
10V logic levels are used in the circuit of Figure 5.
The circuit uses an R/2R voltage-ladder network, with the output-
potential obtained directly by terminating the ladder arms at
either the positive or the negative power supply terminal. Each
CD4007Acontainsthreeinverters,eachinverterfunctioningasa
single-pole double-throw switch to terminate an arm of the R/2R
network at either the positive or negative power-supply terminal.
The resistor ladder is an assembly of 1% tolerance metal-oxide
film resistors. The five arms requiring the highest accuracy are
assembled with series and parallel combinations of 806,000
resistors from the same manufacturing lot.
A single 15V supply provides a positive bus for the CA3160
follower amplifier and feeds the CA3085 voltage regulator. A
“scale-adjust”functionisprovidedbytheregulatoroutputcontrol,
set to a nominal 10V level in this system. The line-voltage
regulation (approximately 0.2%) permits a 9-bit accuracy to be
maintained with variations of several volts in the supply. The
flexibility afforded by the CMOS building blocks simplifies the
design of DAC systems tailored to particular needs.
NOTE:
6. “Digital-to-Analog Conversion Using the Intersil CD4007A
COS/MOS lC”, Application Note AN6080.
FIGURE 4A.
FIGURE 4B. OUTPUT WAVEFORM WITH GROUND REFERENCE
SINE WAVE INPUT
FIGURE 4C. OUTPUT SIGNAL WITH INPUT SIGNAL RAMPING
FIGURE 4. SINGLE SUPPLY VOLTAGE FOLLOWER WITH
ASSOCIATED WAVEFORMS. (e.g., FOR USE IN
SINGLE SUPPLY D/A CONVERTER; SEE FIGURE 9
IN AN6080)
CA3160
-
6
7
3
4
2
+15V
0.01
μ
F
10k
+
0.1
μ
F
BW (-3dB) = 4MHz
SR = 10V/
μ
s
1
5
2k
OFFSET
ADJUST
Top Trace: Output
Bottom Trace: Input
CA3160, CA3160A
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CA3160W WAF | 制造商:Harris Corporation 功能描述: |
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| CA3161E | 制造商:RCA 功能描述: |
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| CA3162_02 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:A/D Converters for 3-Digit Display |
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