MAX127ACNG+ Datasheet MAX128BCAI+, MAX128BEAI+, MAX127BCAI+ | P1-P3

General Description

The MAX127/MAX128 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 may 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 MAX127; and ±V

REF

, ±V

REF

/2, 0

to +V

REF

, 0 to +V

REF

/2 for the MAX128. This range

switching 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 pro-

tected to ±16.5V; a fault condition on any channel will

not affect the conversion result of the selected channel.

Other features include a 5MHz bandwidth track/hold,

an 8ksps throughput rate, and the option of an internal

4.096V or external reference.

The MAX127/MAX128 feature a 2-wire, I

C-compatible

serial interface that allows communication among multi-

ple devices using SDA and SCL lines.

A hardware shutdown input (SHDN) and two software-

programmable power-down modes (standby and full

power-down) are provided for low-current shutdown

between conversions. In standby mode, the reference-

buffer remains active, eliminating start-up delays.

The MAX127/MAX128 are available in 24-pin DIP or

space-saving 28-pin SSOP packages.

Applications

Industrial Control Systems

Data-Acquisition Systems

Robotics

Automatic Testing

Battery-Powered Instruments

Medical Instruments

Features

♦ 12-Bit Resolution, 1/2 LSB Linearity

♦ +5V Single-Supply Operation

♦ I

C-Compatible, 2-Wire Serial Interface

♦ Four Software-Selectable Input Ranges

MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V

MAX128: 0 to +V

REF

, 0 to +V

REF

/2, ±V

REF

±V

REF

♦ 8 Analog Input Channels

♦ 8ksps Sampling Rate

♦ ±16.5V Overvoltage-Tolerant Input Multiplexer

♦ Internal 4.096V or External Reference

♦ Two Power-Down Modes

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

EVALUATION KIT

AVAILABLE

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

MAX127/MAX128

Multirange, +5V, 12-Bit DAS with

2-Wire Serial Interface

________________________________________________________________

Maxim Integrated Products

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

DGND

0.01µF

µC

4.7µF

0.1µF

SHDN

MAX127

MAX128

+5V

ANALOG

INPUTS

SCL

SDA

REF

REFADJ

AGND

SCL SDA

Typical Operating Circuit

19-4773; Rev 0; 7/98

Ordering Information continued at end of data sheet.

PART

MAX127ACNG

MAX127ACNG 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

24 Narrow Plastic DIP

24 Narrow Plastic DIP ±1

±1/2

INL

(LSB)

Pin Configurations appear at end of data sheet.

Ordering Information

MAX127/MAX128

Multirange, +5V, 12-Bit DAS with

2-Wire Serial Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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 to AGND..............................................-0.3V to (V

+ 0.3V)

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

+ 0.3V)

A0, A1, A2 to DGND...................................-0.3V to (V

+ 0.3V)

SHDN, SCL, SDA 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_ _/MAX128_ C_ _.............................0°C to +70°C

MAX127_ E_ _/MAX128_ E_ _ ..........................-40°C to +85°C

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

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

MAX127A/MAX128A

4kHz, V

= ±5V (Note 3)

Up to the 5th harmonic

Bipolar

MAX127B/MAX128B

Unipolar

CONDITIONS

10Aperture Jitter

ns200Aperture Delay

-86

Channel-to-Channel Crosstalk

dB81SFDRSpurious-Free Dynamic Range

dB-87 -80THDTotal Harmonic Distortion

dB70

LSB

±1/2

INLIntegral Nonlinearity

Bits12Resolution

±0.3

LSB

±0.1

Channel-to-Channel Offset

Error Matching

±10

±5

±1

LSB±1DNLDifferential Nonlinearity

LSB

±3

Offset Error

±5

UNITSMIN TYP MAXSYMBOLPARAMETER

Bipolar

Unipolar

ppm/°C

Gain Tempco (Note 2)

±10

±7

LSB

±7

Gain Error (Note 2)

±10

SINAD

Signal-to-Noise plus Distortion

Ratio

Bipolar

Unipolar

Bipolar

MAX127B/MAX128B

Unipolar

MAX127B/MAX128B

MAX127A/MAX128A

ELECTRICAL CHARACTERISTICS

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

REF

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

CLK

= 400kHz;

= T

MIN

to T

MAX

; unless otherwise noted. Typical values are at T

= +25°C.)

DYNAMIC SPECIFICATIONS (800Hz sine-wave input, ±10Vp-p (MAX127) or ±4.096Vp-p (MAX128), f

SAMPLE

= 8ksps)

DC, V

= ±16.5V -96

ACCURACY (Note 1)

MAX127/MAX128

Multirange, +5V, 12-Bit DAS with

2-Wire Serial Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

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

REF

= 4.096V; 4.7µF at REF pin; external clock, f

CLK

= 400kHz;

= T

MIN

to T

MAX

; unless otherwise noted. Typical values are at T

= +25°C.)

MAX128

MAX127

-600 360

-1200 720

µA

±V

REF

/2 range

±V

REF

range

±5V range

-1200 10

±10V range

-600 10

Bipolar

Input Voltage Range V

-10 10

TC V

REF

-5 5

MAX127

-V

REF

-V

REF

/2 V

REF

MAX128

Bipolar,

Table 3

MAX127

MAX128

0 to 5V or 0 to V

REF

/2 range

0 to 10V or 0 to V

REF

range

±5V or ±V

REF

/2 range

±10V or ±V

REF

range

Buffer Voltage Gain 1.638 V/V

REFADJ Adjustment Range ±1.5 %Figure 12

Capacitive Bypass at REF 4.7 µF

REFADJ Output Voltage 2.465 2.500 2.535 V

Load Regulation (Note 5) 10 mV0 to 0.5mA output current

0 V

REF

0 V

REF

Unipolar,

Table 3

Input Resistance

∆V

∆I

kΩ

-10 360

Unipolar

Input Current

-10 720

Bipolar

MAX128

0 to 5V range

-10 0.1 10

0 to 10V range

Unipolar

2.5

Small-Signal Bandwidth

MHz

PARAMETER SYMBOL MIN TYP MAX UNITS

2.5

-3dB

rolloff

1.25

0 10

0 5

Track/Hold Acquisition Time 3 µs

Input Capacitance 40 pF

REFOUT Voltage V

REF

4.076 4.096 4.116 V

REFOUT Tempco

±15

ppm/°C

Output Short-Circuit Current 30 mA

CONDITIONS

(Note 4)

= +25°C

MAX127_C/MAX128_C

±30MAX127_E/MAX128_E

ANALOG INPUT

INTERNAL REFERENCE

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P16

MAX127ACNG+

Mfr. #:

Buy MAX127ACNG+

Manufacturer:

Maxim Integrated

Description:

Data Acquisition ADCs/DACs - Specialized 12-Bit 8Ch 8ksps 4.18V Precision ADC

Lifecycle:

New from this manufacturer.

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MAX127ACNG+

MAX127ACNG+

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