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CA5160M96 Scheda tecnica(PDF) 8 Page - Intersil Corporation

Il numero della parte CA5160M96
Spiegazioni elettronici  4MHz, BiMOS Microprocessor Operational Amplifier with MOSFET Input/CMOS Output
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Produttore elettronici  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CA5160M96 Scheda tecnica(HTML) 8 Page - Intersil Corporation

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8
to draw modest supply-current (see the lower curve in Figure
21) even through the output stage is strobed off. Figure 4A
shows a dual-supply arrangement for the output stage that
can also be strobed off, assuming RL = ∞, by pulling the
potential of Terminal 8 down to that of Terminal 4.
Let it now be assumed that a load-resistance of nominal
value (e.g., 2k
Ω) is connected between Terminal 6 and
ground in the circuit of Figure 4B. Let it further be assumed
again that the input terminal bias (Terminals 2 and 3) is such
that the output terminal (Number 6) voltage is V+/2. Since
PMOS transistor Q8 must now supply quiescent current to
both RL and transistor Q12, it should be apparent that under
these conditions the supply current must increase as an
inverse function of the RL magnitude. Figure 27 shows the
voltage drop across PMOS transistor Q8 as a function of
load current at several supply voltages. Figure 20 shows the
voltage transfer characteristics of the output stage for several
values of load resistance.
Wideband Noise
From the standpoint of low-noise performance
considerations, the use of the CA5160 is most advantageous
in applications where in the source resistance of the input
signal is on the order of 1M
Ω or more. In this case, the total
input-referred noise voltage is typically only 40
µV when the
test-circuit amplifier of Figure 5 is operated at a total supply
voltage of 15V. This value of total input-referred noise
remains essentially constant, even though the value of
source resistance is raised by an order of magnitude. This
characteristic is due to the fact that reactance of the input
capacitance becomes a significant factor in shunting the
source resistance. It should be noted, however, that for
values of source resistance very much greater than 1M
Ω, the
total noise voltage generated can be dominated by the
thermal noise contributions of both the feedback and source
resistors.
Typical Applications
Voltage Followers
Operational amplifiers with very high input resistances, like
the CA5160, are particularly suited to service as voltage
followers. Figure 6 shows the circuit of a classical voltage
follower, together with pertinent waveforms using the
CA5160 in a split supply-configuration.
A voltage follower, operated from a single-supply, is shown in
Figure 7 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 7B with input
signal ramping. The waveforms in Figure 7C 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 7C
also shows the manner in which the CMOS 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 CA5160 in a single-
supply voltage follower application.
3
2
8
4
7
6
RL
Q8
Q12
+
-
OUTPUT
STAGE
FIGURE 4A. DUAL POWER-SUPPLY OPERATION
V+
V-
3
2
8
4
7
6
RL
Q8
Q12
+
-
OUTPUT
STAGE
FIGURE 4B. SINGLE POWER-SUPPLY OPERATION
FIGURE 4. CA5160 OUTPUT STAGE IN DUAL AND SINGLE
POWER SUPPLY OPERATION
V+
6
7
3
4
2
+7.5V
0.01
µF
NOISE
VOLTAGE
OUTPUT
30.1k
0.01
µF
1k
-7.5V
RS
1M
+
-
BW (-3dB) = 200kHz
TOTAL NOISE VOLTAGE
(INPUT REFERRED) = 40
µV (TYP)
FIGURE 5. TEST-CIRCUIT AMPLIFIER (30dB GAIN) USED
FOR WIDEBAND NOISE MEASUREMENTS
CA5160


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