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www.pudn.com.txt 218B

MAX1270-MAX1271B.pdf 736KB

General Description

The MAX1270/MAX1271 are multirange, 12-bit data-

acquisition systems (DAS) that require only a single

+5V supply for operation, yet accept signals at their

analog inputs that can span above the power-supply

rail and below ground. These systems provide eight

analog input channels that are independently software

programmable for a variety of ranges: ±10V, ±5V, 0 to

+10V, 0 to +5V for the MAX1270; ±V

REF

, ±V

REF

/2, 0 to

REF

, 0 to V

REF

/2 for the MAX1271. This range switch-

ing increases the effective dynamic range to 14 bits and

provides the flexibility to interface 4–20mA, ±12V, and

±15V powered sensors directly to a single +5V system.

In addition, these converters are fault protected to

±16.5V; a fault condition on any channel will not affect

the conversion result of the selected channel. Other fea-

tures include a 5MHz bandwidth track/hold, software-

selectable internal/external clock, 110ksps throughput

rate, and internal 4.096V or external reference operation.

The MAX1270/MAX1271 serial interface directly

connects to SPI™/QSPI™ and MICROWIRE™ devices

without external logic.

A hardware shutdown input (SHDN) and two software-

programmable power-down modes, standby (STBYPD)

or full power-down (FULLPD), are provided for low-cur-

rent shutdown between conversions. In standby mode,

the reference buffer remains active, eliminating startup

delays.

The MAX1270/MAX1271 are available in 24-pin narrow

PDIP or space-saving 28-pin SSOP packages.

Applications

Features

♦ 12-Bit Resolution, 0.5 LSB Linearity

♦ +5V Single-Supply Operation

♦ SPI/QSPI and MICROWIRE-Compatible

3-Wire Interface

♦ Four Software-Selectable Input Ranges

MAX1270: 0 to +10V, 0 to +5V, ±10V, ±5V

MAX1271: 0 to V

REF

, 0 to V

REF

/2, ±V

REF

±V

REF

♦ Eight Analog Input Channels

♦ 110ksps Sampling Rate

♦ ±16.5V Overvoltage-Tolerant Input Multiplexer

♦ Internal 4.096V or External Reference

♦ Two Power-Down Modes

♦ Internal or External Clock

♦ 24-Pin Narrow PDIP or 28-Pin SSOP Packages

MAX1270/MAX1271

Multirange, +5V, 8-Channel,

Serial 12-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

DGND



4.7µF

0.1µF

0.01µF

SHDN

MAX1270

MAX1271

+5V

ANALOG

INPUTS

SCLK

DIN

DOUT

SSTRB

I/O

SCK

MOSI

MISO

REF

REFADJ

AGND

MC68HCXX

Typical Operating Circuit

PART

TEMP RANGE

PIN-PACKAGE

INL

(LSB)

MAX1270ACNG

0°C to +70°C 24 Narrow PDIP

±0.5

MAX1270BCNG

0°C to +70°C 24 Narrow PDIP

±1

MAX1270ACAI

0°C to +70°C

28 SSOP

±0.5

MAX1270BCAI

0°C to +70°C

28 SSOP ±1

Ordering Information

19-4782; Rev 2; 9/04

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.

Pin Configurations appear at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

EVALUATION KIT

AVAILABLE

Industrial Control Systems

Data-Acquisition Systems

Battery-Powered

Instruments

Automatic Testing

Robotics

Medical Instruments

MAX1270/MAX1271

Multirange, +5V, 8-Channel,

Serial 12-Bit ADCs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +5.0V ±5%; unipolar/bipolar range; external reference mode, V

REF

= +4.096V; 4.7µF at REF; external clock; f

CLK

= 2.0MHz,

50% duty cycle (MAX127_B); f

CLK

= 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

to AGND............................................................-0.3V to +6V

AGND to DGND.....................................................-0.3V to +0.3V

CH0–CH7 to AGND ......................................................... ±16.5V

REF, REFADJ to AGND ..............................-0.3V to (V

+ 0.3V)

SSTRB, DOUT to DGND.............................-0.3V to (V

+ 0.3V)

SHDN, CS, DIN, SCLK to DGND..............................-0.3V to +6V

Max Current into Any Pin ....................................................50mA

Continuous Power Dissipation (T

= +70°C)

24-Pin Narrow DIP (derate 13.33mW/°C above +70°C)..1067mW

28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW

Operating Temperature Ranges

MAX127_C_ _......................................................0°C to +70°C

MAX127_E_ _......................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

ACCURACY (Note 1)

Resolution 12 Bits

MAX127_A

±0.5

Integral Nonlinearity INL

MAX127_B

±1.0

LSB

Differential Nonlinearity DNL No missing codes over temperature ±1 LSB

MAX127_A ±3

Unipolar

MAX127_B ±5

MAX127_A ±5

Offset Error

Bipolar

MAX127_B ±10

LSB

Unipolar

±0.1

Channel-to-Channel Offset Error

Matching

Bipolar

±0.3

LSB

MAX127_A ±7

Unipolar

MAX127_B ±10

MAX127_A ±7

Gain Error (Note 2)

Bipolar

MAX127_B ±10

LSB

Unipolar, external reference ±3

Gain Error Temperature

Coefficient (Note 2)

Bipolar, external reference ±5

ppm/°C

DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10V

P-P

(MAX1270), or ±4.096V

P-P

(MAX1271), f

SAMPLE

= 110ksps

(MAX127_B), f

SAMPLE

= 100ksps (MAX127_A))

Signal-to-Noise + Distortion Ratio

SINAD 70 dB

Total Harmonic Distortion THD Up to the 5th harmonic -87 -78 dB

Spurious-Free Dynamic Range SFDR 80 dB

50kHz (Note 3) -86

Channel-to-Channel Crosstalk

DC, V

= ±16.5V -96

Aperture Delay External clock mode 15 ns

External clock mode

<50

Aperture Jitter

Internal clock mode 10 ns

MAX1270/MAX1271

Multirange, +5V, 8-Channel,

Serial 12-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +5.0V ±5%; unipolar/bipolar range; external reference mode, V

REF

= +4.096V; 4.7µF at REF; external clock; f

CLK

= 2.0MHz,

50% duty cycle (MAX127_B); f

CLK

= 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ANALOG INPUT

MAX127_A, f

CLK

= 1.8MHz 3.3

Track/Hold Acquisition Time t

ACQ

MAX127_B, f

CLK

= 2.0MHz 3.0

µs

±10V or ±V

REF

range

±5V or ±V

REF

range

2.5

0 to 10V or 0 to

REF

range

2.5

Small-Signal Bandwidth -3dB rolloff

0 to 5V or 0 to

REF

/2 range

1.25

MHz

RNG = 1 0 10

MAX1270

RNG = 0 0 5

RNG = 1 0

REF

Unipolar (BIP =

0), Table 3

MAX1271

RNG = 0 0

REF

RNG = 1 -10

+10

MAX1270

RNG = 0 -5 +5

RNG = 1

-V

REF

Input Voltage Range

(Table 3)

Bipolar (BIP =

1), Table 3

MAX1271

RNG = 0

-V

REF

0 to 10V

range

-10

+720

MAX1270

0 to 5V

range

-10

+360

Unipolar

MAX1271 -10 0.1

+10

±10V

range

-1200 +720

MAX1270

±5V range -600 +360

±V

REF

range

-1200 +10

Input Current I

Bipolar

MAX1271

±V

REF

range

-600 +10

µA

Unipolar 21

Dynamic Resistance

∆V

/∆I

Bipolar 16

kΩ

Input Capacitance (Note 4) 40 pF

MAX1270/MAX1271

Multirange, +5V, 8-Channel,

Serial 12-Bit ADCs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= +5.0V ±5%; unipolar/bipolar range; external reference mode, V

REF

= +4.096V; 4.7µF at REF; external clock; f

CLK

= 2.0MHz,

50% duty cycle (MAX127_B); f

CLK

= 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

INTERNAL REFERENCE

REF Output Voltage V

REF

= +25°C

4.076 4.096 4.116

MAX1270_C/MAX1271_C

±15

REF Output Tempco

TC V

REF

MAX1270_E/MAX1271_E

±30

ppm/°C

Output Short-Circuit Current 30 mA

Load Regulation 0 to 0.5mA output current (Note 5) 10 mV

Capacitive Bypass at REF 4.7 µF

Capacitive Bypass at REFADJ

0.01

µF

REFADJ Output Voltage

2.465 2.500 2.535

REFADJ Adjustment Range Figure 1

±1.5

Buffer Voltage Gain

1.638

V/V

REFERENCE INPUT (Reference buffer disabled, reference input applied to REF)

Input Voltage Range

2.40 4.18

Normal or STBYPD 400

Input Current V

REF

= 4.18V

FULLPD 1

µA

Normal or STBYPD 10 kΩ

Input Resistance V

REF

= 4.18V

FULLPD

4.18

MΩ

REFADJ Threshold for Buffer

Disable

0.5

POWER REQUIREMENT

Supply Voltage V

4.75 5.25

Bipolar range 18

Normal

Unipolar range 6 10

STBYPD power-down mode (Note 6)

700

850

Supply Current I

FULLPD power-down mode

120

220

µA

External reference = 4.096V

±0.1 ±0.5

Power-Supply Rejection

Ratio (Note 7)

PSRR

Internal reference

±0.5

LSB

TIMING

MAX127_A 0.1 1.8

External Clock Frequency Range

SCLK

MAX127_B 0.1 2.0

MHz

MAX127_A 3.3

External clock mode

(Note 8)

MAX127_B 3.0

Acquisition Phase

Internal clock mode, Figure 9 3 5

µs

MAX1270/MAX1271

Multirange, +5V, 8-Channel,

Serial 12-Bit ADCs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

= +5.0V ±5%; unipolar/bipolar range; external reference mode, V

REF

= +4.096V; 4.7µF at REF; external clock; f

CLK

= 2.0MHz,

50% duty cycle (MAX127_B); f

CLK

= 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

MAX127_A 6.6

External clock mode

(Note 8)

MAX127_B 6.0

Conversion Time t

CONV

Internal clock mode, Figure 9 6 7.7 11

µs

MAX127_A 100

External clock mode

MAX127_B 110

Throughput Rate

Internal clock mode 43

ksps

Bandgap Reference Startup Time

Power-up (Note 9)

200

µs

REF

= 4.7µF 8

Reference Buffer Settling Time

To 0.1mV, REF bypass

capacitor fully

discharged

REF

= 33µF 60

DIGITAL INPUTS (DIN, SCLK, CS, and SHDN)

Input High Threshold Voltage V

2.4 V

Input Low Threshold Voltage V

0.8 V

Input Hysteresis V

HYS

0.2 V

Input Leakage Current I

= 0 to V

-10

+10

µA

Input Capacitance C

(Note 4) 15 pF

DIGITAL OUTPUTS (DOUT, SSTRB)

SINK

= 5mA 0.4

Output Voltage Low V

SINK

= 16mA 0.4

Output Voltage High V

SOURCE

= 0.5mA

0.5

Tri-State Leakage Current I

CS = V

-10

+10

µA

Tri-State Output Capacitance C

OUT

CS = V

(Note 4) 15 pF

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