CA3290_04 Datasheet, PDF (1/10 Pages) Intersil Corporation – BiMOS Dual Voltage Comparators with MOSFET Input, Bipolar Output

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CA3290, CA3290A
January 2004
FN1049.4
BiMOS Dual Voltage Comparators
with MOSFET Input, Bipolar Output
The CA3290A and CA3290 types consist of a dual voltage
comparator on a single monolithic chip. The common mode
input voltage range includes ground even when operated
from a single supply. The low supply current drain makes
these comparators suitable for battery operation; their
extremely low input currents allow their use in applications
that employ sensors with extremely high source
impedances. Package options are shown in the table below.
Pinout
CA3290/A (PDIP)
TOP VIEW
OUTPUT (A₁) 1 _A1
INV. INPUT (A₁) 2
NON-INV. INPUT (A₁) 3
V- 4
8 V+
7 OUTPUT (A₂)
A_{2 6 INV. INPUT (A2)}
5 NON-INV. INPUT (A₂)
Features
• MOSFET Input Stage
- Very High Input Impedance (Z_IN) . . . . . . . . 1.7TΩ (Typ)
- Very Low Input Current at V+ = 5V. . . . . . . 3.5pA (Typ)
- Wide Common Mode Input Voltage Range (V_ICR) Can Be
Swung 1.5V (Typ) Below Negative Supply Voltage Rail
- Virtually Eliminates Errors Due to Flow of Input Currents
• Output Voltage Compatible with TTL, DTL, ECL, MOS,
and CMOS Logic Systems in Most Applications
Applications
• High Source Impedance Voltage Comparators
• Long Time Delay Circuits
• Square Wave Generators
• A/D Converters
• Window Comparators
Part Number Information
PART
NUMBER
CA3290AE
CA3290E
TEMP
RANGE (^oC)
-55 to 125
-55 to 125
PACKAGE
8 Ld PDIP
8 Ld PDIP
PKG. NO.
E8.3
E8.3
Schematic Diagram
(ONLY ONE IS SHOWN)
COMPARATOR NO. 1
BIASING CIRCUIT
FOR CURRENT
SOURCES
V+
TO
COMP.
NO. 2
I₁
50µA
I₂
Q₉
100µA
I₃
Q₁₀
50µA
I₄
Q₁₁
Q₁₂
100µA
V_O
Q₁₃ Q₁₄
D₁
D₂
Q₁
+V_I
-V_I
Q₂ Q₃
D₃
D₄
Q₈
Q₄
Q₇
Q₅
Q₆
Q₁₆
Q₁₅
Q₁₇
R₁
Q₁₈
100kΩ
R₂
1kΩ
R₃
C₁
5kΩ 5pF
V-
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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