MAX199 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Multi-Range (±4V, ±2V, +4V, +2V), +5V Supply, 12-Bit DAS with 8+4 Bus Interface

19-0401; Rev 0; 6/95
Multi-Range (±4V, ±2V, +4V, +2V),
+5V Supply, 12-Bit DAS with 8+4 Bus Interface
_______________General Description
The MAX199 multi-range, 12-bit data-acquisition system
(DAS) requires only a single +5V supply for operation,
and converts analog signals up to ±4V at its inputs. This
system provides eight analog input channels that are
independently software programmable for a variety of
ranges: ±VREF, ±VREF/2, 0V to VREF, or 0V to VREF/2.
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 fault-protected to
±16.5V; a fault condition on any channel will not affect
the conversion result of the selected channel. Other fea-
tures include a 5MHz bandwidth track/hold, 100ksps
throughput rate, internal/external clock, internal/external
acquisition control, 8+4 parallel interface, and operation
with an internal 4.096V or external reference.
A hardware SHDN pin and two programmable power-
down modes (STBYPD, FULLPD) provide low-current
shutdown between conversions. In STBYPD mode, the
reference buffer remains active, eliminating start-up
delays.
The MAX199 employs a standard microprocessor (µP)
interface. Its three-state data I/O interface 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 MAX199 is available in 28-pin DIP, wide SO, SSOP,
and ceramic SB packages.
For a different combination of input ranges (±10V, ±5V,
0V to 10V, 0V to 5V), see the MAX197 data sheet. For 12-
bit bus interfaces, see the MAX196/MAX198 data sheet.
________________________Applications
Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
Functional Diagram appears at end of data sheet.
____________________________Features
o 12-Bit Resolution, 1/2LSB Linearity
o Single +5V Operation
o Software-Selectable Input Ranges:
±VREF, ±VREF/2, 0V to VREF, 0V to VREF/2
o Internal 4.096V or External Reference
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 Two Power-Down Modes
o Internal or External Clock
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX199ACNI 0°C to +70°C 28 Narrow Plastic DIP
MAX199BCNI 0°C to +70°C 28 Narrow Plastic DIP
MAX199ACWI 0°C to +70°C 28 Wide SO
MAX199BCWI 0°C to +70°C 28 Wide SO
MAX199ACAI 0°C to +70°C 28 SSOP
MAX199BCAI 0°C to +70°C 28 SSOP
MAX199BC/D 0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
__________________Pin Configuration
TOP VIEW
CLK 1
CS 2
WR 3
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
MAX199
28 DGND
27 VDD
26 REF
25 REFADJ
24 INT
23 CH7
22 CH6
21 CH5
20 CH4
19 CH3
18 CH2
17 CH1
16 CH0
15 AGND
DIP/SO/SSOP/Ceramic SB
________________________________________________________________ Maxim Integrated Products 1
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