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
DescriptionThe 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.
- 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
- Automated Test Equipment (ATE)
- Data Acquisition
- Industrial Controls Systems
- Medical Instruments
|Input Channels||Conv. Rate|
|ADC Architecture||Data Bus||Diff/S.E. Input||Internal VREF|
MAX197EVKIT: Evaluation Kit for the MAX197 and MAX199
Technical DocumentsReference Schematic 3450 Positive Analog Feedback Compensates PT100 Transducer
App Note 270 Analog-Signal Data Acquisition in Industrial Automation Systems
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|