Features: • Fault Protected 16-Channel 12-Bit A/D
Converter with Sample & Hold, Reference,
Clock and 3-State Outputs
• Fast Conversion, less than 15mS
• 2's Complement and Serial Data Output
• Remote Analog Ground Sensing
• Overvoltage Protected Input (±50 V over the Supply Voltages)
• Precision Reference for Long Term Stability and Low Gain T.C.
• Guaranteed Linearity Over Temperature
• Guaranteed Performance at +12/5 V, ±12 & ±15 V
• Low Power (7 mW per Channel Typical)
• Parallel Version: MP3276
• 32 Channel Version: MP3274Pinout
SpecificationsVCC to AGND . . . . . . . . . . . . . . . . . . . . . . . . . .0 to +16.5 V
VEE to AGND . . . . . . . . . . . . . . . . . . . . . . . . . .0 to 16.5 V
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±1 V
Digital Inputs or Outputs (WR, RD, CS, AB0-AB4, ADEN,
SDC) to DGND . . . . . . . . . . . . . . . . . .0.5 V to VDD +0.5 V
Analog Inputs (AIN0 AIN15, GND REF)
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±60 V
NOTES:
1 Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation at or above this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
2 Any input pin which can see a value outside the absolute maximum ratings should be protected by Schottky diode clamps (HP5082-2835) from input pin to the supplies. All logic inputs have protection diodes which will protect the device from short transients outside the supplies of less than 100mA for less than 100ms.
DescriptionThe MP3275 is a complete 16-channel, 12-bit Data Acquisition Subsystem with serial data port. Implemented using an advanced BiCMOS process, the MP3275 combines a 16-channel passive overvoltage-protected multiplexer instrumentation amp, a sample & hold, a SAR, a 12-bit decoded D/A, a comparator, a precision reference and the control logic to achieve an accurate conversion in less than 15ms, and a mux/instrumentation amp settling period of less than 10ms.
A unique input design provides input overvoltage protection to 50 V over the supply voltages. The MP3275 design can allow for an overvoltage condition on unselected channels without disrupting the measured channel or operation of the MP3275! The internal 4 V reference has sufficient output current to provide other system reference needs. Precision thin film scaling and offset resistors are laser trimmed to provide for less than 2 LSB INL for +10 V inputs on all channels.
In addition, the MP3275 will output either full scale (0111 ....) for overrange and full scale (1000....) for underrange conditions. This greatly simplifies microprocessor software development.
MP3275 Data Sheet
