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MAX197：Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface

±17V Fault-Protected ADC with Software-Selectable Input Ranges

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 active-low SHDN pin and two programmable power-down modes (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), refer to the MAX199 data sheet. For 12-bit bus interface, refer to the MAX196 and MAX198 data sheets.

Key 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

MAX197: Functional Diagram Applications/Uses Automated Test Equipment (ATE) Data Acquisition Industrial Controls Systems Medical Instruments Robotics Telecommunications

DataSheet

Parametrics

Design kits & evaluation modules

• MAX197EVKIT

Quality and Environmental Data

• MAX197.pdf

Related Products

• MAX1261：250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
• MAX1262：400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
• MAX115：2x4-Channel, Simultaneous-Sampling 12-Bit ADCs
• MAX1291：250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
• MAX196：6-Channel, Multirange, 5V, 12-Bit DAS with 12-Bit Bus Interface and Fault Protection
• MAX199：8-Channel, Multi-Range, 5V, 12-Bit DAS with 8+4 Bus Interface and Fault Protection

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