19-0401; Rev 0; 6/95
Mu lt i-Ra n g e (±4 V, ±2 V, +4 V, +2 V),
+5 V S u p p ly, 1 2 -Bit DAS w it h 8 +4 Bu s In t e rfa c e
MAX19
_______________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
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
♦ Software-Selectable Input Ranges:
±V
, ±V
, 0V to V
, 0V to V
REF REF/2
REF
REF/2
♦ Internal 4.096V or External Reference
♦ Fault-Protected Input Multiplexer (±16.5V)
♦ 8 Analog Input Channels
♦ 6µs Conversion Time, 100ksps Sampling Rate
♦ Internal or External Acquisition Control
♦ Two Power-Down Modes
ranges: ±V
, ±V
, 0V to V
, or 0V to V
.
REF
REF/2
REF
REF/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.
♦ 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
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.
MAX199ACNI
MAX199BCNI
MAX199ACWI
MAX199BCWI
MAX199ACAI
MAX199BCAI
MAX199BC/D
28 Wide SO
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 popula r µPs. All logic inputs a nd outp uts a re
TTL/CMOS compatible.
28 SSOP
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 MAX199 is available in 28-pin DIP, wide SO, SSOP,
and ceramic SB packages.
TOP VIEW
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.
CLK
28 DGND
1
2
CS
WR
V
DD
27
26
25
24
23
REF
3
________________________Ap p lic a t io n s
Industrial-Control Systems
Robotics
REFADJ
INT
RD
4
HBEN
SHDN
D7
5
MAX199
CH7
6
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
7
22 CH6
21 CH5
D6
8
D5
CH4
CH3
CH2
CH1
CH0
AGND
9
20
19
18
17
16
15
Telecommunications
D4
10
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
Ca ll t o ll fre e 1 -8 0 0 -7 2 2 -8 2 6 6 fo r fre e s a m p le s o r lit e ra t u re .