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 ClockApplication-Industrial-Control Systems
-Robotics
-Data-Acquisition Systems
-Automatic Testing Systems
-Medical Instruments
-TelecommunicationsPinout
SpecificationsVDD 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)
CH0CH7 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, 10sec)..............................+300°CDescriptionThe 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 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 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 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</a> pin and two programmable power-down modes of MAX197(STBYPD, FULLPD) are provided for low-current 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), see the MAX199 data sheet. For 12-bit bus interface, see the MAX196 and MAX198 data sheets.
MAX197 Data Sheet
