MAX1291 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1291

250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface

Maxim Integrated 

19-1532; Rev 3; 12/02

EVAALVUAAILTAIOBNLEKIT

250ksps, +3V, 8-/4-Channel, 12-Bit ADCs

with +2.5V Reference and Parallel Interface

General Description

The MAX1291/MAX1293 low-power, 12-bit analog-to-dig-

ital converters (ADCs) feature a successive-approxima-

tion ADC, automatic power-down, fast wake-up (2µs), an

on-chip clock, +2.5V internal reference, and a high-

speed, byte-wide parallel interface. They operate with a

single +3V analog supply and feature a VLOGIC pin that

allows them to interface directly with a +1.8V to +5.5V

digital supply.

Power consumption is only 5.7mW (VDD = VLOGIC) at the

maximum sampling rate of 250ksps. Two software-selec-

table power-down modes enable the MAX1291/

MAX1293 to be shut down between conversions;

accessing the parallel interface returns them to normal

operation. Powering down between conversions can cut

supply current to under 10µA at reduced sampling rates.

Both devices offer software-configurable analog inputs

for unipolar/bipolar and single-ended/pseudo-differen-

tial operation. In single-ended mode, the MAX1291 has

eight input channels and the MAX1293 has four input

channels (four and two input channels, respectively,

when in pseudo-differential mode).

Excellent dynamic performance and low power, com-

bined with ease of use and small package size, make

these converters ideal for battery-powered and data-

acquisition applications or for other circuits with demand-

ing power consumption and space requirements.

The MAX1291/MAX1293 tri-states INT when CS goes

high. Refer to MAX1261/MAX1263 if tri-stating INT is not

desired.

The MAX1291 is available in a 28-pin QSOP package,

while the MAX1293 is available in a 24-pin QSOP. For

pin-compatible +5V, 12-bit versions, refer to the

MAX1290/MAX1292 data sheet.

Applications

Industrial Control Systems Data Logging

Energy Management

Patient Monitoring

Data-Acquisition Systems Touch Screens

Ordering Information

PART

MAX1291ACEI

MAX1291BCEI

MAX1291AEEI

MAX1291BEEI

TEMP RANGE

0°C to +70°C

0°C to +70°C

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

28 QSOP

28 QSOP

28 QSOP

28 QSOP

INL

(LSB)

±0.5

±1

±0.5

±1

Ordering Information continued at end of data sheet.

Features

o 12-Bit Resolution, ±0.5 LSB Linearity

o +3V Single Operation

o User-Adjustable Logic Level (+1.8V to +3.6V)

o Internal +2.5V Reference

o Software-Configurable, Analog Input Multiplexer

8-Channel Single-Ended/

4-Channel Pseudo-Differential (MAX1291)

4-Channel Single-Ended/

2-Channel Pseudo-Differential (MAX1293)

o Software-Configurable, Unipolar/Bipolar Inputs

o Low Power: 1.9mA (250ksps)

1.0mA (100ksps)

400µA (10ksps)

2µA (Shutdown)

o Internal 3MHz Full-Power Bandwidth Track/Hold

o Byte-Wide Parallel (8 + 4) Interface

o Small Footprint: 28-Pin QSOP (MAX1291)

24-Pin QSOP (MAX1293)

Pin Configurations

TOP VIEW

HBEN 1

D7 2

D6 3

D5 4

D4 5

D3/D11 6

D2/D10 7

D1/D9 8

D0/D8 9

INT 10

RD 11

WR 12

CLK 13

CS 14

MAX1291

28 VLOGIC

27 VDD

26 REF

25 REFADJ

24 GND

23 COM

22 CH0

21 CH1

20 CH2

19 CH3

18 CH4

17 CH5

16 CH6

15 CH7

QSOP

Pin Configurations continued at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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