MAX1281BEUP-T Maxim Integrated, MAX1281BEUP-T Datasheet

MAX1281BEUP-T

Manufacturer Part Number

MAX1281BEUP-T

Description

Analog to Digital Converters - ADC

Manufacturer

Maxim Integrated

Datasheet

1.MAX1281BCUP.pdf (24 pages)

Specifications of MAX1281BEUP-T

Number Of Channels

8/4

Architecture

SAR

Conversion Rate

300 KSPs

Resolution

12 bit

Input Type

Single-Ended/Pseudo-Differential

Snr

70 dB

Interface Type

4-Wire (SPI, Microwire, QSPI, TMS320)

Operating Supply Voltage

2.7 V to 3.6 V

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

TSSOP-20

Maximum Power Dissipation

559 mW

Minimum Operating Temperature

- 40 C

Number Of Converters

Voltage Reference

2.5 V

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The MAX1280/MAX1281 12-bit ADCs combine an 8-chan-

nel analog-input multiplexer, high-bandwidth track/hold,

and serial interface with high conversion speed and low

power consumption. The MAX1280 operates from a single

+4.5V to +5.5V supply; the MAX1281 operates from a sin-

gle +2.7V to +3.6V supply. Both devices’ analog inputs

are software configurable for unipolar/bipolar and single-

ended/pseudo-differential operation.

The 4-wire serial interface connects directly to

SPI™/QSPI™/MICROWIRE™ devices without external

logic. A serial strobe output allows direct connection to

TMS320-family digital signal processors. The MAX1280/

MAX1281 use an external serial-interface clock to per-

form successive-approximation analog-to-digital con-

versions. Both parts feature an internal +2.5V reference

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

adjustment range. An external reference with a 1V to

The MAX1280/MAX1281 provide a hard-wired SHDN

pin and four software-selectable power modes (normal

operation, reduced power, fast power-down, and full

power-down). These devices can be programmed to

automatically shut down at the end of a conversion or to

operate with reduced power. When using the power-

down modes, accessing the serial interface automatical-

ly powers up the devices, and the quick turn-on time

allows them to be powered down between all conver-

sions. This technique can cut supply current to under

100µA at reduced sampling rates.

The MAX1280/MAX1281 are available in 20-pin TSSOP

packages. These devices are higher-speed versions of

the MAX146/MAX147 (for more information, see the

respective data sheet).

19-1684; Rev 2; 10/10

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.

400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,

DD1

range may also be used.

Portable Data Logging

Data Acquisition

Medical Instruments

Battery-Powered Instruments

Pen Digitizers

Process Control

________________________________________________________________ Maxim Integrated Products

General Description

Serial 12-Bit ADCs with Internal Reference

Applications

♦ 8-Channel Single-Ended or 4-Channel

♦ Internal Multiplexer and Track/Hold

♦ Single-Supply Operation

♦ Internal +2.5V Reference

♦ 400ksps Sampling Rate (MAX1280)

♦ Low Power 2.5mA (400ksps)

♦ SPI/QSPI/MICROWIRE/TMS320-Compatible

♦ Software-Configurable Unipolar or Bipolar Inputs

♦ 20-Pin TSSOP Package

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

MAX1280BCUP+

MAX1280BEUP+

MAX1281BCUP+

MAX1281BEUP+

Pseudo-Differential Inputs

4-Wire Serial Interface

+4.5V to +5.5V (MAX1280)

+2.7V to +3.6V (MAX1281)

1.3mA (Reduced-Power Mode)

0.9mA (Fast Power-Down Mode)

2µA (Full Power-Down)

TOP VIEW

PART

SHDN

COM

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

-40°C to +85°C

0°C to +70°C

Ordering Information

RANGE

TEMP

MAX1280

MAX1281

TSSOP

Pin Configuration

PACKAGE

20 TSSOP

SCLK

DIN

SSTRB

DOUT

GND

REFADJ

REF

PIN-

DD1

DD2

Features

(LSB)

INL

±1

Related parts for MAX1281BEUP-T

MAX1281BEUP-T Summary of contents

Page 1

... Power-Down Mode) 2µA (Full Power-Down) ♦ SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface ♦ Software-Configurable Unipolar or Bipolar Inputs ♦ 20-Pin TSSOP Package PART MAX1280BCUP+ MAX1280BEUP+ MAX1281BCUP+ MAX1281BEUP+ +Denotes a lead(Pb)-free/RoHS-compliant package. Applications TOP VIEW Features Ordering Information TEMP PIN- RANGE PACKAGE (LSB) 0° ...

Page 2

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND ............................................................ -0.3V to +6V DD_ ........................................................ -0.3V to +0.3V DD1 DD2 CH0–CH7, COM to GND.......................... -0. REF, REFADJ to ...

Page 3

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX1280 (continued +4.5V to +5.5V, COM = GND, f DD1 DD2 +2.5V at REF, REFADJ = DD1 A MIN PARAMETER ...

Page 4

Page 5

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX1281 (continued +2.7V to +3.6V, COM = GND, f DD1 DD2 +2.5V at REF, REFADJ = DD1 A MIN PARAMETER ...

Page 6

Page 7

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference TIMING CHARACTERISTICS—MAX1281 (Figures +2.7V to +3.6V; T DD1 DD2 PARAMETER SYMBOL SCLK Period t CP SCLK Pulse Width High t CH SCLK ...

Page 8

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference (MAX1280 5.0V, f DD1 DD2 SCLK at REF, 0.01µF capacitor at REFADJ INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE 0.5 0.4 0.3 0.2 0.1 0 ...

Page 9

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference (MAX1280 5.0V, f DD1 DD2 SCLK at REF, 0.01µF capacitor at REFADJ REFERENCE VOLTAGE vs. TEMPERATURE 2.5002 2.5000 MAX1280 2.4998 MAX1281 2.4996 2.4994 2.4992 ...

Page 10

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference PIN NAME 1–8 CH0–CH7 Sampling Analog Inputs Ground Reference for Analog Inputs. COM sets zero-code voltage in single-ended mode. Must be 9 COM stable to ±0.5LSB. Active-Low Shutdown Input. Pulling ...

Page 11

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference Detailed Description The MAX1280/MAX1281 analog-to-digital converters (ADCs) use a successive-approximation conversion tech- nique and input track/hold (T/H) circuitry to convert an analog signal to a 12-bit digital output. A flexible ...

Page 12

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference The T/H enters its tracking mode on the falling clock edge after the fifth bit of the 8-bit control word has been shifted in. It enters its hold mode on ...

Page 13

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference CS SCLK 1 4 SGL/ SEL SEL SEL UNI/ DIN BIP START HIGH-Z SSTRB RB1 HIGH-Z DOUT IDLE Figure 6. Single-Conversion Timing high for one clock period ...

Page 14

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference Table 1. Control-Byte Format BIT 7 BIT 6 BIT 5 (MSB) START SEL2 SEL1 BIT NAME The first logic “1” bit after CS goes low defines the beginning of the ...

Page 15

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference CS t CSS t CSO SCLK DIN t DOE DOUT t STE SSTRB Figure 7. Detailed Serial-Interface Timing The external serial clock not only shifts data in ...

Page 16

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference CS DIN S CONTROL BYTE SCLK HIGH-Z B11 DOUT HIGH-Z SSTRB Figure 8. Continuous 16-Clock/Conversion Timing Table 4. Software-Controlled Power Modes PD1/PD0 MODE Full Power-Down 00 ...

Page 17

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference Table 4 details the four power modes with the corre- sponding supply current and operating sections. For data rates achievable in software power-down modes, see Power-Down Sequencing section. Hardware Power-Down ...

Page 18

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference power consumption using the specified power-down mode, with the internal reference and the maximum clock speed. The clock speed in FASTPD or REDP should be limited to 4.8MHz for the ...

Page 19

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference +3.3V 24kΩ 510kΩ 100kΩ 0.01µF Figure 13. MAX1281 Reference-Adjust Circuit OUTPUT CODE FULL-SCALE TRANSITION 111 110 101 00 ...

Page 20

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference Table 5. Full Scale and Zero Scale UNIPOLAR MODE Full Scale REF COM SUPPLIES V GND DD1 R* = 10Ω V GND COM V DD1 DD2 MAX1280 ...

Page 21

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference 1 CH0 2 CH1 CH2 3 4 CH3 ANALOG MAX1280 INPUTS MAX1281 5 CH4 6 CH5 7 CH6 8 CH7 9 COM REFADJ V 10 SHDN DD1 Figure 17. QSPI ...

Page 22

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference CS SCLK START SEL2 SEL1 SEL0 DIN SSTRB DOUT Figure 19. MAX1280/MAX1281-to-TMS320 Serial Interface Effective Number of Bits Effective number of bits (ENOB) indicates the global accuracy of an ADC ...

Page 23

Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code ...

Page 24

... 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. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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