19-0381; Rev 1; 6/96
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
_______________General Description
The MAX197 multi-range, 12-bit data-acquisition sys-
tem (DAS) requires only a single +5V supply for opera-
tion, yet accepts signals at its analog inputs that may
span both above the power-supply rail and below
ground. This system provides 8 analog input channels
that are independently software programmable for a
variety of ranges: ±10V, ±5V, 0V to +10V, or 0V to +5V.
This increases effective dynamic range to 14 bits, and
provides the user flexibility to interface 4mA-to-20mA,
±12V, and ±15V powered sensors to a single +5V sys-
tem. In addition, the converter is overvoltage tolerant to
±16.5V; a fault condition on any channel will
not
affect
the conversion result of the selected channel. Other
features include a 5MHz bandwidth track/hold, a
100ksps throughput rate, software-selectable internal or
external clock and acquisition, 8+4 parallel interface,
and an internal 4.096V or an external reference.
A hardware SHDN pin and two programmable power-
down modes (STBYPD, FULLPD) are provided for low-
current shutdown between conversions. In STBYPD
mode, the reference buffer remains active, eliminating
start-up delays.
The MAX197 employs a standard microprocessor (µP)
interface. A three-state data I/O port is configured to
operate with 8-bit data buses, and data-access and
bus-release timing specifications are compatible with
most popular µPs. All logic inputs and outputs are
TTL/CMOS compatible.
The MAX197 is available in 28-pin DIP, wide SO, SSOP,
and ceramic SB packages.
For a different combination of ranges (±4V, ±2V, 0V to
4V, 0V to 2V), see the MAX199 data sheet. For 12-bit bus
interface, see the MAX196 and MAX198 data sheets.
KIT
ATION
EVALU
ILABLE
L AVA
MANUA
____________________________Features
o
12-Bit Resolution, 1/2LSB Linearity
o
Single +5V Operation
o
Software-Selectable Input Ranges:
±10V, ±5V, 0V to 10V, 0V to 5V
o
Fault-Protected Input Multiplexer (±16.5V)
o
8 Analog Input Channels
o
6µs Conversion Time, 100ksps Sampling Rate
o
Internal or External Acquisition Control
o
Internal 4.096V or External Reference
o
Two Power-Down Modes
o
Internal or External Clock
MAX197
______________Ordering Information
PART
MAX197ACNI
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
28 Narrow Plastic DIP
MAX197BCNI
0°C to +70°C
28 Narrow Plastic DIP
MAX197ACWI
0°C to +70°C
28 Wide SO
MAX197BCWI
0°C to +70°C
28 Wide SO
MAX197ACAI
0°C to +70°C
28 SSOP
MAX197BCAI
0°C to +70°C
28 SSOP
MAX197BC/D
0°C to +70°C
Dice*
Ordering Information continued at end of data sheet.
*Dice are specified at T
A
= +25°C, DC parameters only.
__________________Pin Configuration
TOP VIEW
CLK 1
CS 2
WR 3
28 DGND
27 V
DD
26 REF
25 REFADJ
________________________Applications
Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
RD 4
HBEN 5
SHDN 6
D7 7
D6 8
D5 9
D4 10
D3/D11 11
D2/D10 12
D1/D9 13
D0/D8 14
MAX197
24 INT
23 CH7
22 CH6
21 CH5
20 CH4
19 CH3
18 CH2
17 CH1
16 CH0
15 AGND
Functional Diagram appears at end of data sheet.
DIP/SO/SSOP/Ceramic SB
1
________________________________________________________________
Maxim Integrated Products
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