Features: ` Four Simultaneous-Sampling T/H Amplifiers with Two Multiplexed Inputs (eight single-ended inputs total)
` 3s Conversion Time per Channel
` Throughput: 250ksps (1 channel)
142ksps (2 channels)
100ksps (3 channels)
76ksps (4 channels)
` Input Range: ±5V (MAX125)
±2.5V (MAX126)
` Fault-Protected Input Multiplexer (±17V)
` ±5V Supplies
` Internal +2.5V or External Reference Operation
` Programmable On-Board Sequencer
` High-Speed Parallel DSP InterfaceApplication ·Multiphase Motor Control
·Power-Grid Synchronization
·Power-Factor Monitoring
·Digital Signal Processing
·Vibration and Waveform AnalysisPinout
SpecificationsAVDD to AGND ...........................................................-0.3V to 6V
AVSS to AGND ............................................................0.3V to -6V
DVDD to DGND ...........................................................-0.3V to 6V
AGND to DGND........................................................-0.3V to 0.3V
CH_ _ to AGND....................................................................±17V
REFIN, REFOUT to AGND ...........................................-0.3V to 6V
Digital Inputs/Outputs to DGND ..............-0.3V to (DVDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 11.8mW/°C above +70°C) ......................941mW
Operating Temperature Ranges
MAX125_CAX/MAX126_CAX.................................0°C to +70°C
MAX125_EAX/MAX126_EAX .............................-40°C to +85°C
Storage Temperature Range .........................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX125/MAX126 are high-speed, multichannel, 14-bit data-acquisition systems (DAS) with simultaneous track/holds (T/Hs). These devices contain a 14-bit, 3s, 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.
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 3s and stores the result in an internal 14x4 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.
MAX126 Data Sheet
