HI-7159A Datasheet, PDF (1/14 Pages) Intersil Corporation – Microprocessor-Compatible, 5-1/2 Digit A/D Converter

HI-7159A
Data Sheet
January 1999 File Number 2936.4
Microprocessor-Compatible, 5-¹/₂ Digit
A/D Converter
The Intersil HI-7159A is a monolithic A/D converter that uses
a unique dual slope technique which allows it to resolve input
changes as small as 1 part in 200,000 (10µV) without the use
of critical external components. Its digital autozeroing feature
virtually eliminates zero drift over temperature. The device is
fabricated in Intersil’ proprietary low noise BiMOS process,
resulting in exceptional linearity and noise performance. The
HI-7159A’s resolution can be switched between a high
resolution 200,000 count (5¹/₂ digit) mode, and a high speed
20,000 count (4¹/₂ digit) mode without any hardware
modifications. In the 4¹/₂ digit uncompensated mode, speeds
of 60 conversions per second can be achieved. The HI-7159A
is designed to be easily interfaced with most microprocessors
through either of its three serial and one parallel interface
modes. In the serial modes, any one of four common baud
rates is available.
Ordering Information
TEMP.
PART NUMBER RANGE (^oC)
PACKAGE
HI3-7159A-5
0 to 70 28 Ld PDIP
PKG.
NO.
E28.6
Features
• ±200,000 Count A/D Converter
• 2V Full Scale Reading With 10µV Resolution
• 15 Conversions Per Second in 5¹/₂ Digit Mode
• 60 Conversions Per Second in 4¹/₂ Digit Mode
• Serial or Parallel Interface Modes
• Four Selectable Baud Rates
• Differential Analog Input
• Differential Reference Input
• Digital Autozero
Applications
• Weigh Scales
• Part Counting Scales
• Laboratory Instruments
• Process Control/Monitoring
• Energy Management
• Seismic Monitoring
Pinout
HI-7159A
(PDIP)
TOP VIEW
V_CC 1
INT OUT 2
INT IN 3
BUF OUT 4
C_REF-
GUARD
5
C_REF- 6
C_{REF+ 7}
C_REF+
GUARD
8
V_REF HI 9
V_REF LO 10
A_GND 11
V_IN HI 12
V_IN LO 13
V_EE 14
28 SEL
27 X_TAL
26 D_GND
25 P7/BRS1
24 P6/BRS0
23 P5/SAD3
22 P4/SAD2
21 P3/SAD1
20 P2/SAD0
19 P1/SMS1
18 P0/SMS0
17 CS/SAD4
16 WR/TXD
15 RD/RXD
Functional Block Diagram
A_GND V_EE
V_CC
X_TAL
D_GND
C_INT
R_INT
V_{REF HI}
V_{REF LO}
V_{IN HI}
V_{IN LO}
C_REF
INTEGRATOR
-
+
COMPARATOR
+
-
CONTROL
SECTION
AND
LATCHES
BUFFER ₊
-
ANALOG SWITCHES
ANALOG
STATE
MACHINE
BUS
INTERFACE
UNIT
UART
8 BIT
BUS
CS
WR
RD
SEL
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999