Part Number: MAX125
Function: 2×4-Channel / Simultaneous-Sampling 14-Bit DAS
Manufacturer: Maxim
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Description
19-1319; Rev 2; 6/07 KIT ATION EVALU E L B A AVAIL 2×4-Channel, Simultaneous-Sampling 14-Bit DAS General Description Features o Four Simultaneous-Sampling T/H Amplifiers with Two Multiplexed Inputs (eight single-ended inputs total) o 3µs Conversion Time per Channel o Throughput: 250ksps (1 channel) 142ksps (2 channels) 100ksps (3 channels) 76ksps (4 channels) o Input Range: ±5V (MAX125) ±2.5V (MAX126) o Fault-Protected Input Multiplexer (±17V) o ±5V Supplies o Internal +2.5V or External Reference Operation o Programmable On-Board Sequencer o High-Speed Parallel DSP Interface MAX125/MAX126 The MAX125/MAX126 are high-speed, multichannel, 14-bit data-acquisition systems (DAS) with simultaneous track/holds (T/Hs). These devices contain a 14-bit, 3µs, successive-approximation analog-to-digital converter (ADC), a +2.5V reference, a buffered reference input, and a bank of four simultaneous-sampling T/H amplifiers that preserve the relative phase information of the sampled inputs. The MAX125/MAX126 have two multiplexed inputs for each T/H, allowing a total of eight inputs. In addition, the converter is overvoltage tolerant to ±17V; a fault condition on any channel will not harm the IC. Available input ranges are ±5V (MAX125) and ±2.5V (MAX126). An on-board sequencer converts one to four channels per CONVST pulse. In the default mode, one T/H output (CH1A) is converted. An interrupt signal (INT) is provided after the last conversion is complete. Convert two, three, or four channels by reprogramming the MAX125/MAX126 through the bidirectional parallel interface. Once programmed, the MAX125/MAX126 continue to convert the specified number of channels per CONVST pulse until they are reprogrammed. The channels are converted sequentially, beginning with CH1. The INT signal always follows the end of the last conversion in a conversion sequence. The ADC converts each assigned channel in 3µs and stores the result in an internal 14×4 RAM. Upon completion of the conversions, data can be accessed by applying successive pulses to the RD pin. Four successive reads access four data words sequentially. The parallel interface’s data-access and bus-release timing specifications are compatible with most popular digital signal processors and 16-bit/32-bit microprocessors, so the MAX125/MAX126 conversion results can be accessed without resorting to wait states. Ordering Information PART MAX125CCAX MAX126CCAX TEMP RANGE 0°C to +70°C 0°C to +70°C PININL PACKAGE (LSB) 36 SSOP 36 SSOP 36 SSOP 36 SSOP ±4 ±4 ±4 ±4 PKG CODE A36-4 A36-4 A36-4 A36-4 MAX125CEAX -40°C to +85°C MAX126CEAX -40°C to +85°C Applications Multiphase Motor Control Power-Grid Synchronization Power-Factor Monitoring Digital Signal Processing Vibration and Waveform Analysis Typical Operating Circuit appears at end of data sheet. Pin Configuration appears at end of data sheet. Maxim Integrated Produc […]
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