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HA3-4905-5 Datasheet(PDF) 4 Page - Intersil Corporation

Part # HA3-4905-5
Description  Precision Quad Comparators
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HA3-4905-5 Datasheet(HTML) 4 Page - Intersil Corporation

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4
Applying the HA-4900 Series Comparators
Supply Connections
This device is exceptionally versatile in working with most
available power supplies. The voltage applied to the V+ and V-
terminals determines the allowable input signal range; while the
voltage applied to the VL+ and VL- determines the output
swing. In systems where dual analog supplies are available,
these would be connected to V+ and V-, while the logic supply
and return would be connected to VLOGIC+ and VLOGIC-. The
analog and logic supply commons can be connected together
at one point in the system, since the comparator is immune to
noise on the logic supply ground. A negative output swing may
be obtained by connecting VL+ to ground and VL- to a negative
supply. Bipolar output swings (15VP-P, Max) may be obtained
using dual supplies. In systems where only a single logic supply
is available (+5V to 15V), V+ and VLOGIC+ may be connected
together to the positive supply while V- and VLOGIC- are
grounded. If an input signal could swing negative with respect
the V- terminal, a resistor should be connected in series with
the input to limit input current to < 5mA since the C-B junction of
the input transistor would be forward biased.
Unused Inputs
Inputs of unused comparator sections should be tied to a
differential voltage source to prevent output “chatter.”
Crosstalk
Simultaneous high frequency operation of all other channels
in the package will not affect the output logic state of a given
channel, provided that its differential input voltage is
sufficient to define a given logic state (
∆VIN ≥±VOS). Low
level or high impedance input lines should be shielded from
other signal sources to reduce crosstalk and interference.
Power Supply Decoupling
Decouple all power supply lines with 0.01
µF ceramic capacitors
to ground line located near the package to reduce coupling
between channels or from external sources.
Response Time
Fast rise time (<200ns) input pulses of several volts
amplitude may result in delay times somewhat longer than
those illustrated for 100mV steps. Operating speed is
optimized by limiting the maximum differential input voltage
applied, with resistor-diode clamping networks.
Typical Applications
Data Acquisition System
In this circuit the HA-4900 series is used in conjunction with
a D to A converter to form a simple, versatile, multi-channel
analog input for a data acquisition system. In operation the
processor first sends an address to the D to A, then the
processor reads the digital word generated by the
comparator outputs. To perform a simple comparison, the
processor sets the D to A to a given reference level, then
examines one or more comparator outputs to determine if
their inputs are above or below the reference. A window
comparison consists of two such cycles with 2 reference
levels set by the D to A. One way to digitize the inputs would
be for the processor to increment the D to A in steps. The D
to A address, as each comparator switches, is the digitized
level of the input. While stairstepping the D to A is slower
than successive approximation, all channels are digitized
during one staircase ramp.
Schematic Diagram
Q9D
BIAS 2
ONE FOURTH ONLY
R20D
1k
R20C
1k
R20B
1k
R20A
1k
Q9C
Q9B
Q9A
R21
1k
Q10
D9A
BIAS 1
Q5
Q4
D4A
D4B
Q4C
Q3
R16
540
PR1
200k
R10
4k
Q2
Q1
R9
4k
BIAS 3
BIAS 4
Q11
+IN
Q17
Q18
Q12
Q13
R1
500
R2
13k
R3
1k
Q19
Q20
Q14
R4
1k
Q21
Q22
-IN
MN1
R7
2.5k
R6
2.5k
Q16
Q7
Q23
R5
360
MN2
MN3
Q24 Q25
R18
664
Q38
MN4
D45
D11A
Q26
R17
19k
R14
5k
Q33
Q34
Q36
Q37
Q30
Q28
R11
8k
R15
8k
Q31
R23
100
R24
14k
D29B
Q29
Q29A
R22
100
R12
8k
Q32
MN6
MN5
VLOGIC-
OUT
VLOGIC+
V-
V+
Q15
D35
D39
HA-4900, HA-4902, HA-4905


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