19-0381; Rev 2; 9/01
KIT
ATION
EVALU
ABLE
IL
A
V
LA
MANUA
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
________________________Applications
Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
Functional Diagram appears at end of data sheet.
____________________________Features
♦ 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
______________Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX197ACNI
0°C to +70°C
28 Narrow Plastic DIP
MAX197BCNI
0°C to +70°C
28 Narrow Plastic DIP
MAX197ACWI
0°C to +70°C
28 Wide SO
MAX197BCWI
0°C to +70°C
28 Wide SO
MAX197ACAI
0°C to +70°C
28 SSOP
MAX197BCAI
0°C to +70°C
28 SSOP
MAX197BC/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
28 DGND
27 VDD
CS 2
WR 3
26 REF
RD 4
25 REFADJ
HBEN 5
SHDN 6
D7 7
MAX197
24 INT
23 CH7
22 CH6
D6 8
21 CH5
D5 9
20 CH4
D4 10
19 CH3
D3/D11 11
18 CH2
D2/D10 12
17 CH1
D1/D9 13
16 CH0
D0/D8 14
15 AGND
DIP/SO/SSOP/Ceramic SB
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX197
_______________General Description
The MAX197 multi-range, 12-bit data-acquisition system (DAS) requires only a single +5V supply for operation, 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 system. In addition, the converter is overvoltage tolerant to
±16.5V; a fault condition on any channel does 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 powerdown modes (STBYPD, FULLPD) are provided for lowcurrent 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), refer to the MAX199 data sheet. For 12-bit
bus interface, refer to the MAX196 and MAX198 data
sheets.
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
ABSOLUTE MAXIMUM RATINGS
VDD to AGND............................................................-0.3V to +7V
AGND to DGND.....................................................-0.3V to +0.3V
REF to AGND..............................................-0.3V to (VDD + 0.3V)
REFADJ to AGND.......................................-0.3V to (VDD + 0.3V)
Digital Inputs to DGND...............................-0.3V to (VDD + 0.3V)
Digital Outputs to DGND ............................-0.3V to (VDD + 0.3V)
CH0–CH7 to AGND ..........................................................±16.5V
Continuous Power Dissipation (TA = +70°C)
Narrow Plastic DIP (derate 14.29mW/°C above +70°C)....1143mW
Wide SO (derate 12.50mW/°C above +70°C)..............1000mW
SSOP (derate 9.52mW/°C above +70°C) ......................762mW
Narrow Ceramic SB (derate 20.00mW/°C above +70°C)..1600mW
Operating Temperature Ranges
MAX197_C_ _ .......................................................0°C to +70°C
MAX197_E_ _.....................................................-40°C to +85°C
MAX197_M_ _ ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 5V ±5%; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF pin; external clock, fCLK = 2.0MHz
with 50% duty cycle; TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ACCURACY (Note 1)
Resolution
12
Integral Nonlinearity
INL
Differential Nonlinearity
DNL
±1/2
MAX197B
±1
±1
Unipolar
Offset Error
Bipolar
Channel-to-Channel Offset
Error Matching
MAX197A
MAX197B
±5
MAX197A
±5
MAX197B
±10
±0.1
Bipolar
±0.5
Gain Error
(Note 2)
Bipolar
LSB
LSB
±3
Unipolar
Unipolar
Gain Temperature Coefficient
(Note 2)
Bits
MAX197A
LSB
MAX197A
±7
MAX197B
±10
MAX197A
±7
MAX197B
LSB
LSB
±10
Unipolar
3
Bipolar
5
ppm/°C
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10Vp-p, fSAMPLE = 100ksps)
Signal-to-Noise + Distortion Ratio
SINAD
Total Harmonic Distortion
THD
Spurious-Free Dynamic Range
SFDR
MAX197A
70
MAX197B
69
Up to the 5th harmonic
dB
-85
80
-78
dB
dB
Channel-to-Channel Crosstalk
50kHz, VIN = ±5V (Note 3)
-86
dB
Aperture Delay
External CLK mode/external acquisition control
15
ns