MAX1240AESA-T Maxim Integrated, MAX1240AESA-T Datasheet

MAX1240AESA-T

Manufacturer Part Number

MAX1240AESA-T

Description

Analog to Digital Converters - ADC

Manufacturer

Maxim Integrated

Datasheet

1.MAX1241CCPA.pdf (15 pages)

Specifications of MAX1240AESA-T

Number Of Channels

Architecture

SAR

Conversion Rate

73 KSPs

Resolution

12 bit

Input Type

Single-Ended

Snr

70 dB

Interface Type

QSPI, Serial (SPI, Microwire)

Operating Supply Voltage

2.7 V to 3.6 V

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

SOIC-8 Narrow

Maximum Power Dissipation

727 mW

Minimum Operating Temperature

- 40 C

Number Of Converters

Voltage Reference

3.6 V

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The MAX1240/MAX1241 low-power, 12-bit analog-to-

digital converters (ADCs) are available in 8-pin pack-

ages. The MAX1240 operates with a single +2.7V to

+3.6V supply, and the MAX1241 operates with a single

+2.7V to +5.25V supply. Both devices feature a 7.5µs

successive-approximation ADC, a fast track/hold

(1.5µs), an on-chip clock, and a high-speed, 3-wire ser-

ial interface.

Power consumption is only 37mW (V

73ksps maximum sampling speed. A 2µA shutdown

mode reduces power at slower throughput rates.

The MAX1240 has an internal 2.5V reference, while the

MAX1241 requires an external reference. The MAX1241

accepts signals from 0V to V

input range includes the positive supply rail. An exter-

nal clock accesses data from the 3-wire interface,

which connects directly to standard microcontroller I/O

ports. The interface is compatible with SPI™, QSPI™,

and MICROWIRE™.

Excellent AC characteristics and very low power com-

bined with ease of use and small package size make

these converters ideal for remote-sensor and data-

acquisition applications, or for other circuits with

demanding power consumption and space require-

ments. The MAX1240/MAX1241 are available in 8-pin

PDIP and SO packages.

19-1155; Rev 5; 8/10

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

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

__________________General Description

TOP VIEW

Battery-Powered Systems

Portable Data Logging

Isolated Data Acquisition

Process Control

Instrumentation

SHDN

REF

________________________________________________________________ Maxim Integrated Products

AIN

PDIP/SO

MAX1240

MAX1241

Pin Configuration

REF

, and the reference

Applications

SCLK

DOUT

GND

= 3V) at the

12-Bit Serial ADCs in 8-Pin SO

♦ Single-Supply Operation:

♦ 12-Bit Resolution

♦ Internal 2.5V Reference (MAX1240)

♦ Small Footprint: 8-Pin PDIP/SO Packages

♦ Low Power: 3.7µW (73ksps, MAX1240)

♦ Internal Track/Hold

♦ SPI/QSPI/MICROWIRE 3-Wire Serial Interface

♦ Internal Clock

Ordering Information continued at end of data sheet.

*Dice are specified at T

**Future product—contact factory for availability.

/V denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package.

________________________________Features

MAX1240ACPA+

MAX1240BCPA+

MAX1240CCPA+

MAX1240ACSA+

MAX1240BCSA+

MAX1240CCSA+

MAX1240CC/D

MAX1240AESA/V+**

MAX1240BESA/V+

SCLK

SHDN

REF

AIN

+2.7V to +3.6V (MAX1240)

+2.7V to +5.25V (MAX1241)

3mW (73ksps, MAX1241)

66µW (1ksps, MAX1241)

5µW (power-down mode)

PART*

+2.7V, Low-Power,

(MAX1240 ONLY)

2.5V REFERENCE

CONTROL

LOGIC

T/H

-40°C to +85°C 8 SO

TEMP RANGE

= +25°C, DC parameters only.

0°C to +70°C

Ordering Information

Functional Diagram

GND

12-BIT

SAR

CLOCK

INT

8 PDIP

8 SO

Dice*

PA C K A G E

MAX1240

MAX1241

OUTPUT

SHIFT

PIN -

DOUT

(LSB)

±1/2

INL

±1

Related parts for MAX1240AESA-T

MAX1240AESA-T Summary of contents

Page 1

... SPI/QSPI/MICROWIRE 3-Wire Serial Interface ♦ Internal Clock PART* MAX1240ACPA+ MAX1240BCPA+ MAX1240CCPA+ MAX1240ACSA+ MAX1240BCSA+ MAX1240CCSA+ MAX1240CC/D MAX1240AESA/V+** MAX1240BESA/V+ Applications Ordering Information continued at end of data sheet. *Dice are specified at T **Future product—contact factory for availability. /V denotes an automotive qualified part. +Denotes a lead(Pb)-free/RoHS-compliant package ...

Page 2

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ABSOLUTE MAXIMUM RATINGS V to GND .............................................................-0.3V to +6V DD AIN to GND................................................-0. REF to GND ...............................................-0. Digital Inputs to GND...............................................-0.3V to +6V DOUT to GND............................................-0. ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V (MAX1240 capacitor at REF pin, MAX1241—external reference; V PARAMETER SYMBOL INTERNAL REFERENCE (MAX1240 only) REF Output Voltage REF Short-Circuit Current REF Temperature Coefficient Load Regulation (Note 4) Capacitive Bypass ...

Page 4

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V (MAX1240 capacitor at REF pin, MAX1241—external reference; V PARAMETERS SYMBOL POWER REQUIREMENTS Supply Voltage V Supply Current I Supply Rejection PSR ...

Page 5

DOUT 6k DGND a) High and Figure 1. Load Circuits for DOUT Enable Time DOUT 6k DGND High-Z OH Figure 2. Load Circuits for DOUT Disable Time __________________________________________Typical Operating ...

Page 6

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ____________________________Typical Operating Characteristics (continued 3.0V 2.5V 2.1MHz REF SCLK SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ...

Page 7

Operating Characteristics (continued 3.0V, REF = 2.5V 2.1MHz SCLK INTEGRAL NONLINEARITY vs. CODE 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 0 1024 2048 3072 CODE _______________________________________________________________________Pin Description PIN NAME 1 V Positive Supply ...

Page 8

Low-Power, 12-Bit Serial ADCs in 8-Pin SO +2.7V to +3.6V* 4.7μF 0.1μ SCLK DD 2 ANALOG INPUT MAX1240 AIN MAX1241 REF SHUTDOWN 3 SHDN DOUT INPUT 4 REF GND REFERENCE INPUT C** (MAX1241 ONLY) ...

Page 9

The ADCs’ input tracking circuitry has a 2.25MHz small- signal bandwidth possible to digitize high- speed transient events and measure periodic signals with bandwidths exceeding the ADC’s sampling rate by using undersampling techniques. To avoid aliasing of ...

Page 10

Low-Power, 12-Bit Serial ADCs in 8-Pin SO Using SHDN to Reduce Supply Current Power consumption can be reduced significantly by shutting down the MAX1240/MAX1241 between con- versions. Figure 6 shows a plot of average supply cur- rent versus conversion ...

Page 11

CS t CS0 SCLK t DV DOUT t APR (TRACK/ACQUIRE) INTERNAL T/H Figure 9. Detailed Serial-Interface Timing End of conversion (EOC) is signaled by DOUT going high. DOUT’s rising edge can be used as a framing signal. SCLK shifts the ...

Page 12

Low-Power, 12-Bit Serial ADCs in 8-Pin SO 5) With CS = high, wait the minimum specified time, t before initiating a new conversion by pulling CS low conversion is aborted by pulling CS high before the conversion’s ...

Page 13

SCLK CS t CONV DOUT* D11 D10 MSB EOC *WHEN CS IS HIGH, DOUT = HIGH -Z Figure 12. SPI/MICROWIRE Serial Interface Timing (CPOL = CPHA = 0) SCLK CS t CONV DOUT* EOC *WHEN CS IS HIGH, DOUT = ...

Page 14

... Information (continued) PART TEMP RANGE MAX1240AEPA+ -40°C to +85°C MAX1240BEPA+ -40°C to +85°C MAX1240CEPA+ -40°C to +85°C MAX1240AESA+ -40°C to +85°C MAX1240BESA+ -40°C to +85°C MAX1240CESA+ -40°C to +85°C MAX1240AMJA+ -55°C to +125°C MAX1240BMJA+ -55°C to +125°C MAX1240CMJA+ -55°C to +125°C MAX1241ACPA+ 0° ...

Page 15

... 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. 15 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products 2 ...

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