MAX125, MAX126 2x4通道、同时采样、14位DAS

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概述

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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 active-low CONVST pulse. In the default mode, one T/H output (CH1A) is converted. An interrupt signal (active-low 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 active-low 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 14x4 RAM. Upon completion of the conversions, data can be accessed by applying successive pulses to the active-low 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.

关键特性

应用/使用

Four Simultaneous-Sampling T/H Amplifiers with Two Multiplexed Inputs (eight single-ended inputs total)
3µs 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 Interface

	数字信号处理(DSP)
	多相电机控制
	功率因数监视
	电网同步
	振动与波形分析

Key Specifications: Precision ADCs (< 5Msps)

Part Number

ADC Resolution (Bits)

Input Channels

Conv. Rate (ksps)

Max. Conv. Time (µs)

Data Bus (Bits)

Ref. (V)

Input Range (V)

Diff. In

Supply Voltage (V)

Typ. Supply Current (mA)

Typ. Power (mW)

Low Power Mode

Standby Mode

EV-Kit

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX125

250

µP/14

Ext
Int +2.5

±5

165

Yes

DICE SALES/0
SSOP/36

163

-40 to +85
0 to +70

$13.42 @ 1k

MAX126

±2.5

$13.42 @ 1k

See All Precision ADCs (< 5Msps) (301)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.