CA3290 Datasheet, PDF (1/8 Pages) Intersil Corporation – BiMOS Dual Voltage Comparators with MOSFET Input, Bipolar Output

Data Sheet
CA3290, CA3290A
September 1998 File Number 1049.3
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
Ordering 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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