Rainbow-electronics MAX126 Manual do Utilizador descarregar pdf

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

________________General Description

The MAX125/MAX126 are high-speed, multichannel,

14-bit data-acquisition systems (DAS) with simultane-

ous track/holds (T/Hs). These devices contain a 14-bit,

3µs, successive-approximation analog-to-digital con-

verter (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 pro-

vided 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 con-

verts 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 suc-

cessive 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 microproces-

sors, so the MAX125/MAX126 conversion results can

be accessed without resorting to wait states.

________________________Applications

Multiphase Motor Control

Power-Grid Synchronization

Power-Factor Monitoring

Digital Signal Processing

Vibration and Waveform Analysis

____________________________Features

♦ 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

MAX125/MAX126

2x4-Channel, Simultaneous-Sampling

14-Bit DAS

________________________________________________________________

Maxim Integrated Products

19-1319; Rev 1; 1/98

PART

MAX125ACAX

MAX125BCAX 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

36 SSOP*

EVALUATION KIT

AVAILABLE

______________Ordering Information

Contact factory for availability.

Typical Operating Circuit appears at end of data sheet.

Pin Configuration appears at end of data sheet.

INL

(LSB)

±2

±4

MAX125AEAX -40°C to +85°C 36 SSOP* ±2

MAX125BEAX -40°C to +85°C 36 SSOP* ±4

MAX125CCAX 0°C to +70°C 36 SSOP ±4

MAX125CEAX -40°C to +85°C 36 SSOP ±4

MAX126ACAX

MAX126BCAX

MAX126CCAX 0°C to +70°C

0°C to +70°C

0°C to +70°C 36 SSOP*

36 SSOP*

36 SSOP

±2

±4

MAX126AEAX -40°C to +85°C 36 SSOP* ±2

MAX126BEAX -40°C to +85°C 36 SSOP* ±4

MAX126CEAX -40°C to +85°C 36 SSOP ±4

1 2 3 4 5 6 ... 15 16

MAX125/MAX126 1
14-Bit DAS 1

Resumo do Conteúdo

Página 1 - 14-Bit DAS

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.________

Página 2

MAX125/MAX126Reading a ConversionDigitized data from up to four channels are stored inmemory to be read out through the parallel interface.After recei

Página 3

1ppm/°C (max) temperature drift. Connect an externalreference at REFIN as shown in Figure 7. The minimumimpedance is 7kΩ for DC currents in both norma

Página 4

MAX125/MAX126The circuit of Figure 10 shows a typical vector motor-control application using all available inputs of theMAX125/MAX126. CH1A and CH2A a

Página 5

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS______________________________________________________________________________________ 13Figu

Página 6

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS14 ______________________________________________________________________________________3635

Página 7

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS______________________________________________________________________________________ 15____

Página 8

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DASMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely emb

Página 9

MAX125MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS2 _____________________________________________________________________________________

Página 10

µAMAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS_______________________________________________________________________________________ 3EL

Página 11

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS4 _______________________________________________________________________________________COND

Página 12

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS_______________________________________________________________________________________ 5COND

Página 13

_______________Detailed DescriptionThe MAX125/MAX126 use a successive-approximationconversion technique and four simultaneous-samplingtrack/hold (T/H)

Página 14

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS_______________________________________________________________________________________ 7MUX2

Página 15

MAX125/MAX1262x4-Channel, Simultaneous-Sampling14-Bit DAS8 _______________________________________________________________________________________sign

Página 16

Between conversions, the buffer input is connected tochannel 1 of the selected track/hold bank. When achannel is not selected, switches S1, S2, and S3

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Rainbow-electronics MAX126 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX126. Rainbow Electronics MAX126 User Manual Manual do Utilizador

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