19-0435; Rev 0; 9/95
KIT
ATION
EVALU
BLE
AVAILA
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
____________________________Features
o
12-Bit Resolution, 1/2LSB Linearity
o
Single +5V Supply Operation
o
Software-Selectable Input Ranges:
±10V, ±5V, 0V to +10V, 0V to +5V (MAX196)
±V
REF
, ±V
REF
/2, 0V to +V
REF
, 0V to +V
REF
/2
(MAX198)
o
Internal 4.096V or External Reference
o
Fault-Protected Input Multiplexer
o
6 Analog Input Channels
o
6µs Conversion Time, 100ksps Sampling Rate
o
Internal or External Acquisition Control
o
Two Power-Down Modes
o
Internal or External Clock
_______________General Description
The MAX196/MAX198 multirange, 12-bit data-acquisi-
tion systems (DAS) require only a single +5V supply for
operation, yet convert analog signals at their inputs up
to ±10V (MAX196) and ±4V (MAX198). These systems
provide six analog input channels that are indepen-
dently software programmable for a variety of ranges:
±10V, ±5V, 0V to +10V, and 0V to +5V for the MAX196;
±V
REF
, ±V
REF
/2, 0V to +V
REF
, and 0V to +V
REF
/2 for
the MAX198. This range switching increases the effec-
tive dynamic range to 14 bits and provides the flexibility
to interface ±12V, ±15V, and 4mA to 20mA powered
sensors to a single +5V system. In addition, these con-
verters are fault protected 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, 100ksps throughput rate, soft-
ware-selectable internal/external clock, internal/external
acquisition control, 12-bit parallel interface, and internal
4.096V or external reference.
Two programmable power-down modes (STBYPD,
FULLPD) provide low-current shutdown between con-
versions. In STBYPD mode, the reference buffer
remains active, eliminating start-up delays.
The MAX196/MAX198 employ a standard microproces-
sor (µP) interface. A three-state data I/O port is config-
ured to operate with 16-bit data buses, and data-
access and bus-release timing specifications are com-
patible with most popular µPs. All logic inputs and out-
puts are TTL/CMOS compatible.
These devices are available in 28-pin DIP, wide SO,
SSOP (55% smaller in area than wide SO), and ceramic
SB packages. For 8+4 bus interface, see the MAX197
and the MAX199 data sheets. An evaluation kit will be
available after December 1995 (MAX196EVKIT-DIP).
MAX196/MAX198
______________Ordering Information
PART
MAX196ACNI
MAX196BCNI
MAX196ACWI
MAX196BCWI
MAX196ACAI
MAX196BCAI
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
PIN-PACKAGE
28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO
28 Wide SO
28 SSOP
28 SSOP
Ordering Information continued at end of data sheet.
__________________Pin Configuration
TOP VIEW
CLK 1
CS 2
D11 3
D10 4
28 DGND
27 V
DD
26 WR
25 RD
________________________Applications
Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
D9 5
D8 6
D7 7
D6 8
D5 9
D4 10
D3 11
D2 12
D1 13
D0 14
MAX196
MAX198
24 INT
23 REF
22 REFADJ
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
Call toll free 1-800-722-8266 for free samples or literature.
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