19-0381; Rev 1; 6/96
Mu lt i-Ra n g e (±1 0 V, ±5 V, +1 0 V, +5 V),
S in g le +5 V, 1 2 -Bit DAS w it h 8 +4 Bu s In t e rfa c e
MAX197
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 12-Bit Resolution, 1/2LSB Linearity
♦ Single +5V Operation
♦ Software-Selectable Input Ranges:
±10V, ±5V, 0V to 10V, 0V to 5V
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
s p a n b oth a b ove the p owe r-s up p ly ra il a nd b e low
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
fe a ture s inc lud e a 5MHz b a nd wid th tra c k/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.
♦ 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
______________Ord e rin g In fo rm a t io n
PART
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
PIN-PACKAGE
28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO
MAX197ACNI
MAX197BCNI
MAX197ACWI
MAX197BCWI
MAX197ACAI
MAX197BCAI
MAX197BC/D
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.
28 Wide SO
28 SSOP
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 popula r µPs. All logic inputs a nd outp uts a re
TTL/CMOS compatible.
28 SSOP
Dice*
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
__________________P in Co n fig u ra t io n
The MAX197 is available in 28-pin DIP, wide SO, SSOP,
and ceramic SB packages.
TOP VIEW
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.
CLK
CS
28 DGND
1
2
V
27
26
25
24
23
DD
REF
WR
RD
3
REFADJ
INT
4
________________________Ap p lic a t io n s
Industrial-Control Systems
Robotics
HBEN
SHDN
D7
5
MAX197
CH7
6
7
22 CH6
21 CH5
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
D6
8
D5
CH4
CH3
CH2
CH1
CH0
AGND
9
20
19
18
17
16
15
D4
10
Telecommunications
D3/D11 11
D2/D10 12
13
14
D1/D9
D0/D8
Functional Diagram appears at end of data sheet.
DIP/SO/SSOP/Ceramic SB
________________________________________________________________ Maxim Integrated Products
1
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