8-Channel, Multi-Range, 5V, 12-Bit DAS with 8+4 Bus Interface and Fault Protection
±17V Fault-Protected ADC with Software-Selectable Input Ranges
DescriptionThe 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 ranges: ±VREF, ±VREF/2, 0V to VREF, or 0V to VREF/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 system. 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 features 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.
A hardware active-low 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.
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 popular µPs. All logic inputs and outputs are TTL/CMOS compatible.
The MAX199 is available in 28-pin DIP, wide SO, SSOP, and ceramic SB packages.
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.
- 12-Bit Resolution, 1/2LSB Linearity
- Single +5V Operation
- Software-Selectable Input Ranges:
- ±VREF, ±VREF/2, 0V to VREF, 0V to VREF/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
- Internal or External Clock
- Automatic Testing Systems
- Data-Acquisition Systems
- Industrial-Control 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 DocumentsApp 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|