Rainbow-electronics MAX149 User Manual download pdf

General Description

The MAX148/MAX149 10-bit data-acquisition systems

combine an 8-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 sample to 133ksps.

Both devices’ 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 MAX148/

MAX149 use either the internal clock or an external serial-

interface clock to perform successive-approximation

analog-to-digital conversions.

The MAX149 has an internal 2.5V reference, while the

MAX148 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 con-

version. Accessing the serial interface automatically

powers up the MAX148/MAX149, and the quick turn-on

time allows them to be shut down between all conver-

sions. This technique can cut supply current to under

60µA at reduced sampling rates.

The MAX148/MAX149 are available in a 20-pin DIP and a

20-pin SSOP.

For 4-channel versions of these devices, see the

MAX1248/MAX1249 data sheet.

________________________Applications

Portable Data Logging Data Acquisition

Medical Instruments Battery-Powered Instruments

Pen Digitizers Process Control

____________________________Features

♦ 8-Channel Single-Ended or 4-Channel

Differential Inputs

♦ Single-Supply Operation: +2.7V to +5.25V

♦ Internal 2.5V Reference (MAX149)

♦ 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

♦ 20-Pin DIP/SSOP Packages

MAX148/MAX149

+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

________________________________________________________________

Maxim Integrated Products

I/O

SCK (SK)

MOSI (SO)

MISO (SI)

SHDN

SSTRB

DOUT

DIN

SCLK

COM

AGND

DGND

CH7

4.7µF

0.1µF

CH0

0V TO

+2.5V

ANALOG

INPUTS

MAX149

CPU

+3V

VREF

0.01µF

REFADJ

__________Typical Operating Circuit

19-0464; Rev 2; 5/98

PART

†

MAX148ACPP

MAX148BCPP

MAX148ACAP 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 Plastic DIP

20 SSOP

EVALUATION KIT

AVAILABLE

Ordering Information

Ordering Information continued at end of data sheet.

†

Contact factory for availability of alternate surface-mount

packages.

MAX148BCAP 0°C to +70°C 20 SSOP

INL

(LSB)

±1/2

±1

±1/2

±1

SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configuration appears at end of data sheet.

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.

1 2 3 4 5 6 ... 23 24

Summary of Contents

Page 1 - Serial 10-Bit ADCs

General DescriptionThe MAX148/MAX149 10-bit data-acquisition systemscombine an 8-channel multiplexer, high-bandwidthtrack/hold, and serial interface w

Page 2

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs10 _____________________________________________________________________________

Page 3

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 4

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs12 _____________________________________________________________________________

Page 5

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 6

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs14 _____________________________________________________________________________

Page 7

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 8

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs16 _____________________________________________________________________________

Page 9

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 10

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs18 _____________________________________________________________________________

Page 11

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 12

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs2 ______________________________________________________________________________

Page 13

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs20 _____________________________________________________________________________

Page 14

High-Speed Digital Interfacing with QSPIThe MAX148/MAX149 can interface with QSPI using the circuit in Figure 20 (fSCLK= 2.0MHz, CPOL = 0, CPHA = 0).

Page 15

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs22 _____________________________________________________________________________

Page 16 - Table 5. Software Power-Down

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 17 - MAX148/9-F14C

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Page 18

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 19

IDDMAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs4 ___________________________________________________________________________

Page 20

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 21

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs6 ______________________________________________________________________________

Page 22

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

Page 23 - SSOP.EPS

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs8 ______________________________________________________________________________

Page 24 - PDIPN.EPS

MAX148/MAX149+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs________________________________________________________________________________

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Rainbow-electronics MAX149 User Manual

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