MAX1237EUA Maxim Integrated Products, MAX1237EUA Datasheet

MAX1237EUA

Manufacturer Part Number

MAX1237EUA

Description

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1237EUA.pdf (22 pages)

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The MAX1236–MAX1239 low-power, 12-bit, multichan-

nel analog-to-digital converters (ADCs) feature internal

track/hold (T/H), voltage reference, clock, and an

operate from a single supply of 2.7V to 3.6V (MAX1237/

MAX1239) or 4.5V to 5.5V (MAX1236/MAX1238) and

require only 670µA at the maximum sampling rate of

94.4ksps. Supply current falls below 230µA for sam-

pling rates under 46ksps. AutoShutdown™ powers

down the devices between conversions, reducing sup-

ply current to less than 1µA at low throughput rates.

The MAX1236/MAX1237 have four analog input chan-

nels each, while the MAX1238/MAX1239 have 12 ana-

log input channels each. The fully differential analog

inputs are software configurable for unipolar or bipolar,

and single-ended or differential operation.

The full-scale analog input range is determined by the

internal reference or by an externally applied reference

voltage ranging from 1V to V

MAX1239 feature a 2.048V internal reference and the

MAX1236/MAX1238 feature a 4.096V internal reference.

The MAX1236/MAX1237 are available in an 8-pin µMAX

package. The MAX1238/MAX1239 are available in a 16-

pin QSOP package. The MAX1236–MAX1239 are guar-

anteed over the extended temperature range

(-40°C to +85°C). For pin-compatible 10-bit parts, refer to

the MAX1136–MAX1139 data sheet. For pin-compatible

8-bit parts, refer to the MAX1036–MAX1039 data sheet.

19-2333; Rev 4; 9/06

Hand-Held Portable

Applications

Medical Instruments

Battery-Powered Test

Equipment

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

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.

MAX1236

MAX1237

MAX1238

MAX1239

C-compatible 2-wire serial interface. These devices

PART

CHANNELS

INPUT

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,

4-/12-Channel, 2-Wire Serial, 12-Bit ADCs

________________________________________________________________ Maxim Integrated Products

General Description

REFERENCE

INTERNAL

4.096

2.048

4.096

2.048

Solar-Powered Remote

Systems

Received-Signal-Strength

Indicators

System Supervision

(V)

Selector Guide

Applications

. The MAX1237/

VOLTAGE

4.5 to 5.5

2.7 to 3.6

4.5 to 5.5

2.7 to 3.6

SUPPLY

(V)

(LSB)

INL

±1

♦ High-Speed I

♦ Single-Supply

♦ Internal Reference

♦ External Reference: 1V to V

♦ Internal Clock

♦ 4-Channel Single-Ended or 2-Channel Fully

♦ 12-Channel Single-Ended or 6-Channel Fully

♦ Internal FIFO with Channel-Scan Mode

♦ Low Power

♦ Software-Configurable Unipolar/Bipolar

♦ Small Packages

Ordering Information continued at end of data sheet.

Pin Configurations and Typical Operating Circuit appear at

end of data sheet.

MAX1236EUA

MAX1236KEUA

MAX1236LEUA

MAX1236MEUA

MAX1237EUA

MAX1237KEUA

MAX1237LEUA

MAX1237MEUA

MAX1238EEE

MAX1238KEEE

MAX1238LEEE

MAX1238MEEE

Differential (MAX1236/MAX1237)

Differential (MAX1238/MAX1239)

400kHz Fast Mode

1.7MHz High-Speed Mode

2.7V to 3.6V (MAX1237/MAX1239)

4.5V to 5.5V (MAX1236/MAX1238)

2.048V (MAX1237/MAX1239)

4.096V (MAX1236/MAX1238)

670µA at 94.4ksps

230µA at 40ksps

60µA at 10ksps

6µA at 1ksps

0.5µA in Power-Down Mode

8-Pin µMAX (MAX1236/MAX1237)

16-Pin QSOP (MAX1238/MAX1239)

PART

-40°C to +85°C

C-Compatible Serial Interface

TEMP RANGE

Ordering Information

PIN-

PACKAGE

8 µMAX

16 QSOP

Features

ADDRESS

0110100

0110000

0110010

0110110

0110100

0110000

0110010

0110110

0110101

0110001

0110011

0110111

C SLAVE

Related parts for MAX1237EUA

MAX1237EUA Summary of contents

Page 1

... Power-Down Mode ♦ Software-Configurable Unipolar/Bipolar ♦ Small Packages 8-Pin µMAX (MAX1236/MAX1237) 16-Pin QSOP (MAX1238/MAX1239) Applications PART MAX1236EUA MAX1236KEUA MAX1236LEUA MAX1236MEUA MAX1237EUA MAX1237KEUA MAX1237LEUA SUPPLY INL VOLTAGE MAX1237MEUA (LSB) (V) MAX1238EEE 4.5 to 5.5 ±1 MAX1238KEEE 2.7 to 3.6 ±1 MAX1238LEEE 4 ...

Page 2

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD AIN0–AIN11, REF to GND ............-0.3V to the lower of (V SDA, SCL to GND.....................................................-0.3V to +6V Maximum ...

Page 3

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs ELECTRICAL CHARACTERISTICS (continued 2.7V to 3.6V (MAX1237/MAX1239 4.096V (MAX1236/MAX1238 0.1µF, f REF T = +25°C, see Tables 1–5 for programming notation.) ...

Page 4

Page 5

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs TIMING CHARACTERISTICS (Figure 1) (continued 2.7V to 3.6V (MAX1237/MAX1239 4.096V (MAX1236/MAX1238 0.1µF, f REF T = +25°C, see Tables 1–5 for ...

Page 6

Page 7

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs (V = 3.3V (MAX1237/MAX1239 ended, unipolar +25°C, unless otherwise noted.) A AVERAGE SUPPLY CURRENT vs. CONVERSION RATE (EXTERNAL CLOCK) 800 A) INTERNAL ...

Page 8

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs PIN MAX1236 MAX1238 MAX1237 MAX1239 — 4–8 — 16, 15 — — ...

Page 9

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs SDA SCL V DD GND AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 AIN9 AIN10 AIN11/REF Figure 2. MAX1238/MAX1239 Simplified Functional Diagram ...

Page 10

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs signal. At the end of the acquisition interval, the T/H switches move to the hold position retaining the charge stable sample of the ...

Page 11

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs swing from (GND - 0.3V ing damage to the device. For accurate conversions, the inputs must not go more than 50mV below GND or ...

Page 12

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs A bus master initiates communication with a slave device by issuing a START condition followed by a slave address. When idle, the MAX1236–MAX1239 continu- ously wait for ...

Page 13

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs Configuration/Setup Bytes (Write Cycle) A write cycle begins with the bus master issuing a START condition followed by seven address bits (Figure 7) and a write bit ...

Page 14

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs Table 2. Configuration Byte Format BIT 7 BIT 6 BIT 5 (MSB) REG SCAN1 SCAN0 BIT NAME 7 REG Register bit 1 = setup byte (see Table ...

Page 15

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs Table 4. Channel Selection in Differential Mode (SGL/DIF = CS3 CS2 CS1 CS0 AIN0 ...

Page 16

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs MASTER TO SLAVE SLAVE TO MASTER A. SINGLE CONVERSION WITH INTERNAL CLOCK SLAVE ADDRESS R A CLOCK STRETCH RESULT 4 MSBs ...

Page 17

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs Table 5. Scanning Configuration SCAN1 SCAN0 Scans up from AIN0 to the input selected by CS3–CS0. When CS3–CS0 exceeds 11, the scanning stops AIN11. ...

Page 18

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs Table 6. Reference Voltage and AIN_/REF Format SEL2 SEL1 SEL0 REFERENCE VOLTAGE ...

Page 19

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs OUTPUT CODE V REF AIN- 011...111 2 011...110 ZS = AIN- -V REF - AIN- 000...010 2 V 000...001 REF 1 LSB ...

Page 20

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs Effective Number of Bits Effective number of bits (ENOB) indicates the global accuracy of an ADC at a specific input frequency and sampling rate. An ideal ADC’s ...

Page 21

Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages Ø0.50±0.1 0.6±0.1 ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Package Information (continued) PACKAGE OUTLINE, QSOP .150" ...

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