MAX197 Maxim, MAX197 Datasheet
MAX197
Manufacturer Part Number
MAX197
Description
Multi-Range (10V / 5V / +10V / +5V) / Single +5V / 12-Bit DAS with 8+4 Bus Interface
Manufacturer
Maxim
Datasheet
1.MAX197.pdf
(16 pages)
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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.
________________________Applications
19-0381; Rev 1; 6/96
Functional Diagram appears at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
Single +5V, 12-Bit DAS with 8+4 Bus Interface
Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
________________________________________________________________ Maxim Integrated Products
Multi-Range (±10V, ±5V, +10V, +5V),
____________________________Features
Ordering Information continued at end of data sheet.
*Dice are specified at T
__________________Pin Configuration
______________Ordering Information
MAX197ACNI
MAX197BCNI
MAX197ACWI
MAX197BCWI
MAX197ACAI
MAX197BCAI
MAX197BC/D
12-Bit Resolution, 1/2LSB Linearity
Single +5V Operation
Software-Selectable Input Ranges:
±10V, ±5V, 0V to 10V, 0V to 5V
Fault-Protected Input Multiplexer (±16.5V)
8 Analog Input Channels
6µs Conversion Time, 100ksps Sampling Rate
Internal or External Acquisition Control
Internal 4.096V or External Reference
Two Power-Down Modes
Internal or External Clock
TOP VIEW
PART
D3/D11
D2/D10
D1/D9
D0/D8
SHDN
HBEN
CLK
WR
RD
CS
D7
D6
D5
D4
DIP/SO/SSOP/Ceramic SB
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
10
11
12
13
14
1
2
3
4
5
6
7
8
9
A
= +25°C, DC parameters only.
MAX197
PIN-PACKAGE
28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO
28 Wide SO
28 SSOP
28 SSOP
Dice*
28
26
25
24
23
22
21
20
19
18
17
16
15
27
DGND
V
REF
CH7
CH2
CH0
REFADJ
INT
CH6
CH5
CH4
CH3
CH1
AGND
DD
1
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