Rainbow-electronics MAX1249 Manual do Utilizador descarregar pdf (Página 1)

_______________

General Description

The MAX1248/MAX1249 10-bit data-acquisition sys-

tems combine a 4-channel multiplexer, high-bandwidth

track/hold, and serial interface with high conversion

speed and low power consumption. They operate from

a single +2.7V to +5.25V supply, and their analog

inputs are software configurable for unipolar/bipolar

and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/

QSPI™ and MICROWIRE™ devices without external

logic. A serial strobe output allows direct connection

to TMS320-family digital signal processors. The

MAX1248/MAX1249 use either the internal clock or an

external serial-interface clock to perform successive-

approximation analog-to-digital conversions.

The MAX1248 has an internal 2.5V reference, while the

MAX1249 requires an external reference. Both parts

have a reference-buffer amplifier with a ±1.5% voltage

adjustment range.

These devices provide a hard-wired SHDN pin and a

software-selectable power-down, and can be pro-

grammed to automatically shut down at the end of a

conversion. Accessing the serial interface automatically

powers up the MAX1248/MAX1249, and the quick

turn-on time allows them to be shut down between all

conversions. This technique can cut supply current to

under 60µA at reduced sampling rates.

The MAX1248/MAX1249 are available in a 16-pin DIP

and a very small QSOP that occupies the same board

area as an 8-pin SO.

For 8-channel versions of these devices, see the

MAX148/MAX149 data sheet.

________________________Applications

Portable Data Logging Data Acquisition

Medical Instruments Battery-Powered Instruments

Pen Digitizers System Supervision

____________________________Features

♦ 4-Channel Single-Ended or 2-Channel

Differential Inputs

♦ Single +2.7V to +5.25V Operation

♦ Internal 2.5V Reference (MAX1248)

♦ Low Power: 1.2mA (133ksps, +3V supply)

54µA (1ksps, +3V supply)

1µA (power-down mode)

♦ SPI/QSPI/MICROWIRE/TMS320-Compatible

4-Wire Serial Interface

♦ Software-Configurable Unipolar or Bipolar Inputs

♦ 16-Pin QSOP Package (same area as 8-pin SO)

MAX1248/MAX1249

+2.7V to +5.25V, Low-Power, 4-Channel,

Serial 10-Bit ADCs in QSOP-16

________________________________________________________________

Maxim Integrated Products

19-1072; Rev 2; 5/98

PART

†

MAX1248ACPE

MAX1248BCPE

MAX1248ACEE 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 Plastic DIP

16 QSOP

_____________

Ordering Information

Ordering Information continued at end of data sheet.

†

Contact factory for availability of alternate surface-mount

packages.

Pin Configuration appears at end of data sheet.

MAX1248BCEE 0°C to +70°C 16 QSOP

INL

(LSB)

±1/2

±1

±1/2

±1

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

I/O

SCK (SK)

MOSI (SO)

MISO (SI)

SHDN

SSTRB

DOUT

DIN

SCLK

COM

AGND

DGND

CH3

4.7µF

0.01µF

0.1µF

CH0

0V TO

+2.5V

ANALOG

INPUTS

MAX1248

CPU

+3V

VREF

REFADJ

__________Typical Operating Circuit

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.

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Resumo do Conteúdo

Página 1 - Serial 10-Bit ADCs in QSOP-16

_______________General DescriptionThe MAX1248/MAX1249 10-bit data-acquisition sys-tems combine a 4-channel multiplexer, high-bandwidthtrack/hold, and

Página 2

MAX1248/MAX1249plest software interface requires only three 8-bit transfersto perform a conversion (one 8-bit transfer to configurethe ADC, and two mo

Página 3

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

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MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-1612 ________________________________________________________________

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MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 6

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-1614 ________________________________________________________________

Página 7

POWERED UPHARDWAREPOWER-DOWNPOWERED UPPOWERED UP10+2 DATA BITS10+2 DATA BITS INVALIDDATAVALIDDATAEXTERNALEXTERNALS XX X X X1 1 S 0 0X XXXX X X X X XS

Página 8

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-1616 ________________________________________________________________

Página 9

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16Lowest Power at Higher ThroughputsFigure 13b shows the power consump

Página 10

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16External ReferenceWith both the MAX1248 and MAX1249, an external re

Página 11

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 12

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-162 _________________________________________________________________

Página 13

MAX1248/MAX1249TMS320LC3x InterfaceFigure 20 shows an application circuit to interface theMAX1248/MAX1249 to the TMS320 in external clockmode. The tim

Página 14

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 15

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-1622 ________________________________________________________________

Página 16

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 17

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16NOTESMaxim cannot assume responsibility for use of any circuitry ot

Página 18

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 19

VDD= 5.25VMAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-164 _______________________________________________________

Página 20

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 21

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-166 _________________________________________________________________

Página 22

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

Página 23

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-168 _________________________________________________________________

Página 24

MAX1248/MAX1249+2.7V to +5.25V, Low-Power, 4-Channel,Serial 10-Bit ADCs in QSOP-16____________________________________________________________________

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Rainbow-electronics MAX1249 Manual do Utilizador Página 1

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