CA5160 查看數據表（PDF） - Intersil
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CA5160 Datasheet PDF : 18 Pages
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CA5160
Top Trace: Output
Bottom Trace: Input
FIGURE 6B. SMALL SIGNAL RESPONSE
with series and parallel combinations of 806,000Ω resistors from
the same manufacturing lot.
A single 15V supply provides a positive bus for the CA5160 fol-
lower amplifier and feeds the CA3085 voltage regulator. A “scale-
adjust” function is provided by the regulator output control, 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 sys-
tems tailored to particular needs.
Error Amplifier in Regulated Power Supplies
The CA5160 is an ideal choice for error-amplifier service in regu-
lated power supplies since it can function as an error-amplifier
when the regulated output voltage is required to approach 0V.
The circuit shown in Figure 9 uses a CA5160 as an error ampli-
fier in a continuously adjustable 1A power supply. One of the key
features of this circuit is its ability to regulate down to the vicinity
of zero with only one DC power supply input.
An RC network, connected between the base of the output drive
transistor and the input voltage, prevents “turn-on overshoot”, a
condition typical of many operational-amplifier regulator circuits.
As the amplifier becomes operational, this RC network ceases
to have influence on the regulator performance.
NOTE: “Digital-to-Analog Conversion Using the Intersil
CD4007A CMOS IC”, Application Note AN6080.
+15V
Top Trace: Output Signal
Center Trace: Difference Signal 5mV/Div.
Bottom Trace: Input Signal
FIGURE 6C. INPUT-OUTPUT DIFFERENCE SIGNAL SHOWING
SETTLING TIME
FIGURE 6. SPLIT SUPPLY VOLTAGE FOLLOWER WITH
ASSOCIATED WAVEFORMS
9 Bit CMOS DAC
A typical circuit of a 9 bit Digital-to-Analog Converter (DAC) (see
Note) is shown in Figure 8. This system combines the concepts
of multiple-switch CMOS ICs, a low cost ladder network of dis-
crete metal-oxide-film resistors, a CA5160 op amp connected as
a follower, and an inexpensive monolithic regulator in a simple
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 8.
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 CD4007A
contains three “inverters”, each “inverter” functioning as a single-
pole double-throw switch to terminate an arm of the R/2R network
at either the positive or negative power-supply terminal. The resis-
tor ladder is an assembly of 1% tolerance metal-oxide film resis-
tors. The five arms requiring the highest accuracy are assembled
10kΩ
3
+
7
0.01µF
6
2-
4
5
1
100kΩ
OFFSET
ADJUST
2kΩ
0.1µF
FIGURE 7A. SINGLE SUPPLY FOLLOWER
0
FIGURE 7B. OUTPUT SIGNAL WITH INPUT SIGNAL RAMPING
3-9
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