Maxim MAX127BENG, MAX127BEAI, MAX127BCNG, MAX127BCAI, MAX127AENG Datasheet

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Maxim MAX127BENG, MAX127BEAI, MAX127BCNG, MAX127BCAI, MAX127AENG Datasheet

19-4773; Rev 0; 7/98

KIT

EVALUATION

AVAILABLE

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

Description

12-bit data require only a single accept signals at their above the power-supply systems provide eight independently software ranges: ±10V, ±5V, 0 to and ±VREF, ±VREF/2, 0 MAX128. This range dynamic range to 14 to interface 4–20mA, directly to a single converters are fault proon any channel will of the selected channel. bandwidth track/hold,

the option of an internal

Features

12-Bit Resolution, 1/2 LSB Linearity

+5V Single-Supply Operation

I2C-Compatible, 2-Wire Serial Interface

Four Software-Selectable Input Ranges MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V MAX128: 0 to +VREF, 0 to +VREF/2, ±V REF,

±V REF/2

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

The MAX127/MAX128 feature a 2-wire, I2C-compatible serial interface that allows communication among multiple devices using SDA and SCL lines.

A hardware shutdown input (SHDN) and two softwareprogrammable power-down modes (standby and full power-down) are provided for low-current shutdown between conversions. In standby mode, the referencebuffer 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

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

INL

(LSB)

 

 

 

 

 

 

 

MAX127ACNG

0°C to +70°C

24 Narrow Plastic DIP

±1/2

 

 

 

 

MAX127ACNG

0°C to +70°C

24 Narrow Plastic DIP

±1

 

 

 

 

Ordering Information continued at end of data sheet.

Typical Operating Circuit

 

 

 

+5V

 

 

 

 

0.1μF

 

 

 

 

 

 

 

 

μC

 

 

 

VDD

 

 

 

 

 

SHDN

SCL

SDA

 

 

 

 

 

 

CH0

 

 

 

 

 

CH1

 

 

 

1k

ANALOG

CH2

MAX127

 

CH3

 

 

INPUTS

CH4

MAX128

 

 

 

CH5

 

 

 

 

 

CH6

 

 

 

 

 

CH7

 

 

 

 

 

 

 

SCL

 

 

 

 

 

SDA

 

 

 

REF

 

A0

 

 

 

 

A1

 

 

 

REFADJ

A2

 

 

4.7μF

0.01μF

DGND

AGND

 

 

Pin Configurations appear at end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

MAX127/MAX128

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

ABSOLUTE MAXIMUM RATINGS

VDD 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 (VDD + 0.3V)

REFADJ to AGND.......................................

-0.3V to (VDD + 0.3V)

A0, A1, A2 to DGND...................................

-0.3V to (VDD + 0.3V)

SHDN, SCL, SDA to DGND ......................................

-0.3V to +6V

Max Current into Any Pin ....................................................

50mA

Continuous Power Dissipation (TA = +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

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.

ELECTRICAL CHARACTERISTICS

(VDD = +5V ±5%; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF; external clock, fCLK = 400kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

 

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

ACCURACY (Note 1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Resolution

 

 

 

12

 

 

Bits

 

 

 

 

 

 

 

 

Integral Nonlinearity

INL

MAX127A/MAX128A

 

 

±1/2

LSB

 

 

 

 

 

MAX127B/MAX128B

 

 

±1

 

 

 

 

 

 

 

 

 

 

 

 

 

Differential Nonlinearity

DNL

 

 

 

 

±1

LSB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unipolar

MAX127A/MAX128A

 

 

±3

 

 

 

 

 

 

 

 

Offset Error

 

MAX127B/MAX128B

 

 

±5

LSB

 

 

 

 

 

 

 

 

 

 

 

Bipolar

MAX127A/MAX128A

 

 

±5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX127B/MAX128B

 

 

±10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel-to-Channel Offset

 

Unipolar

 

±0.1

 

LSB

Error Matching

 

 

 

 

 

 

 

Bipolar

 

±0.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unipolar

MAX127A/MAX128A

 

 

±7

 

 

 

 

 

 

 

 

Gain Error (Note 2)

 

MAX127B/MAX128B

 

 

±10

LSB

 

 

 

 

 

 

 

 

 

 

 

 

Bipolar

MAX127A/MAX128A

 

 

±7

 

 

 

 

 

 

 

 

 

 

MAX127B/MAX128B

 

 

±10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gain Tempco (Note 2)

 

Unipolar

 

3

 

ppm/°C

 

 

 

 

 

 

 

Bipolar

 

5

 

 

 

 

 

 

 

 

 

 

 

 

DYNAMIC SPECIFICATIONS (800Hz sine-wave input, ±10Vp-p (MAX127) or ±4.096Vp-p (MAX128), fSAMPLE = 8ksps)

 

Signal-to-Noise plus Distortion

SINAD

 

 

70

 

 

dB

Ratio

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total Harmonic Distortion

THD

Up to the 5th harmonic

 

-87

-80

dB

 

 

 

 

 

 

 

 

 

Spurious-Free Dynamic Range

SFDR

 

 

81

 

 

dB

 

 

 

 

 

 

 

 

Channel-to-Channel Crosstalk

 

4kHz, VIN = ±5V (Note 3)

 

-86

 

dB

 

 

 

 

 

 

 

DC, VIN = ±16.5V

 

-96

 

 

 

 

 

 

Aperture Delay

 

 

 

 

200

 

ns

 

 

 

 

 

 

 

 

Aperture Jitter

 

 

 

 

10

 

ns

 

 

 

 

 

 

 

 

2 _______________________________________________________________________________________

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V ±5%; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF pin; external clock, fCLK = 400kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

 

CONDITIONS

 

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANALOG INPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Track/Hold Acquisition Time

 

 

 

 

 

 

 

 

 

 

3

 

µs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

±10V or ±VREF range

 

 

5

 

 

 

Small-Signal Bandwidth

 

 

 

-3dB

±5V or ±VREF/2 range

 

 

2.5

 

 

MHz

 

 

 

rolloff

0 to 10V or 0 to VREF range

 

 

2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 to 5V or 0 to VREF/2 range

 

 

1.25

 

 

 

 

 

 

 

 

MAX127

 

0

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unipolar,

 

 

 

 

0

 

5

 

 

 

 

 

 

Table 3

MAX128

 

0

 

VREF

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Voltage Range

 

VIN

 

 

0

 

VREF/2

 

V

 

 

 

 

 

 

 

 

 

 

MAX127

 

 

-10

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bipolar,

 

 

 

 

-5

 

5

 

 

 

 

 

 

Table 3

MAX128

 

 

-VREF

 

VREF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-VREF/2

 

VREF/2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX127

0 to 10V range

 

-10

 

720

 

 

 

 

 

 

Unipolar

 

 

 

 

 

 

 

 

 

 

 

 

 

0 to 5V range

 

-10

 

360

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX128

 

 

-10

0.1

10

 

 

Input Current

 

IIN

 

 

 

 

 

 

 

 

 

µA

 

 

MAX127

±10V range

 

-1200

 

720

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bipolar

 

±5V range

-600

 

360

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX128

±VREF range

 

-1200

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

±VREF/2 range

 

-600

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Resistance

 

VIN

 

Unipolar

 

 

 

 

 

21

 

 

 

IIN

 

 

 

 

 

 

 

 

 

 

 

Bipolar

 

 

 

 

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Capacitance

 

 

 

(Note 4)

 

 

 

 

 

 

40

 

pF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERNAL REFERENCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFOUT Voltage

 

VREF

TA = +25°C

 

4.076

4.096

4.116

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

REFOUT Tempco

TC VREF

MAX127_C/MAX128_C

 

 

±15

 

 

ppm/°C

 

 

 

 

 

 

 

 

 

MAX127_E/MAX128_E

 

 

±30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Short-Circuit Current

 

 

 

 

 

 

 

 

 

 

30

 

mA

 

 

 

 

 

 

 

 

 

 

 

 

Load Regulation (Note 5)

 

 

 

0 to 0.5mA output current

 

 

 

10

 

mV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Capacitive Bypass at REF

 

 

 

 

 

 

 

4.7

 

 

 

µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFADJ Output Voltage

 

 

 

 

 

 

 

 

2.465

2.500

2.535

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFADJ Adjustment Range

 

 

 

Figure 12

 

 

 

 

 

±1.5

 

 

%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Buffer Voltage Gain

 

 

 

 

 

 

 

 

 

1.638

 

 

V/V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX127/MAX128

_______________________________________________________________________________________ 3

MAX127/MAX128

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V ±5%; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF pin; external clock, fCLK = 400kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

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

Input Voltage Range

 

 

 

 

2.4

 

4.18

V

 

 

 

 

 

 

 

 

 

 

 

VREF =

Normal, or STANDBY

 

 

400

 

Input Current

 

power-down mode

 

 

µA

 

4.18V

 

 

 

 

 

 

 

 

 

 

 

 

 

FULL power-down mode

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Resistance

 

Normal or STANDBY power-down mode

10

 

 

 

 

 

 

 

 

 

 

 

FULL power-down mode

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFADJ Threshold for

 

 

 

 

VDD - 0.5

 

 

V

Buffer Disable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POWER REQUIREMENTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Supply Voltage

VDD

 

 

 

4.75

 

5.25

V

 

 

 

 

 

 

 

 

 

 

 

Normal mode, bipolar ranges

 

 

18

mA

 

 

 

 

 

 

 

 

 

 

 

 

Supply Current

IDD

Normal mode, unipolar ranges

 

6

10

 

 

 

 

 

 

 

 

 

STANDBY power-down mode (Note 6)

 

700

850

µA

 

 

 

 

 

 

 

 

 

 

 

 

 

FULL power-down mode

 

 

120

220

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power-Supply Rejection Ratio

PSRR

External reference = 4.096V

 

±0.1

±0.5

LSB

(Note 7)

Internal reference

 

 

±0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIMING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

External Clock Frequency Range

fCLK

 

 

 

 

 

0.4

MHz

 

 

 

 

 

 

 

 

 

Conversion Time

tCONV

 

 

 

6.0

7.7

10.0

µs

 

 

 

 

 

 

 

 

 

Throughput Rate

 

 

 

 

 

 

8

ksps

 

 

 

 

 

 

 

 

 

Bandgap Reference

 

Power-up (Note 8)

 

 

200

 

µs

Start-Up Time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference Buffer Settling Time

 

To 0.1mV, REF bypass

CREF = 4.7µF

 

8

 

ms

 

capacitor fully discharged

CREF = 33µF

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DIGITAL INPUTS (SHDN, A2, A1,

A0)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input High Threshold Voltage

VIH

 

 

 

 

 

2.4

V

 

 

 

 

 

 

 

 

 

Input Low Threshold Voltage

VIL

 

 

 

0.8

 

 

V

 

 

 

 

 

 

 

 

 

Input Leakage Current

IIN

VIN = 0 or VDD

 

 

±0.1

±10

µA

 

 

 

 

 

 

 

 

 

Input Capacitance

CIN

(Note 4)

 

 

 

 

15

pF

 

 

 

 

 

 

 

 

 

Input Hysteresis

VHYS

 

 

 

 

0.2

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4 _______________________________________________________________________________________

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V ±5%; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF pin; external clock, fCLK = 400kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

DIGITAL INPUTS (SDA, SCL)

 

 

 

 

 

 

 

 

 

 

 

 

 

Input High Threshold Voltage

VIH

 

 

 

0.7 x VDD

V

Input Low Threshold Voltage

VIL

 

0.3 x VDD

 

 

V

 

 

 

 

 

 

 

Input Hysteresis

VHYS

 

0.05 x VDD

 

 

V

Input Leakage Current

IIN

VIN = 0 or VDD

 

±0.1

±10

µA

Input Capacitance

CIN

(Note 4)

 

 

15

pF

 

 

 

 

 

 

 

DIGITAL OUTPUTS (SDA)

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Low Voltage

VOL

ISINK = 3mA

 

 

0.4

V

 

 

 

 

ISINK = 6mA

 

 

0.6

 

 

 

 

 

 

 

 

 

 

 

 

Three-State Output Capacitance

COUT

(Note 4)

 

 

15

pF

 

 

 

 

 

 

 

TIMING CHARACTERISTICS

(VDD = +4.75V to +5.25V; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF pin; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETERS

 

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

22-WIRE- FASTMODE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCL Clock Frequency

 

fSCL

 

 

 

400

kHz

 

 

 

 

 

 

 

 

Bus Free Time Between a

 

tBUF

 

1.3

 

 

µs

STOP and START Condition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hold Time (Repeated)

 

 

 

 

 

 

tHD,STA

 

0.6

 

 

µs

START Condition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low Period of the SCL Clock

 

tLOW

 

1.3

 

 

µs

 

 

 

 

 

 

 

 

High Period of the SCL Clock

 

tHIGH

 

0.6

 

 

µs

 

 

 

 

 

 

 

 

Set-Up Time for a Repeated

 

 

 

 

 

 

tSU,STA

 

0.6

 

 

µs

START Condition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Data Hold Time

 

tHD,DAT

 

0

 

0.9

µs

 

 

 

 

 

 

 

 

Data Setup Time

 

tSU,DAT

 

100

 

 

ns

 

 

 

 

 

 

 

 

Rise Time for Both SDA and SCL

 

 

20 +

 

300

 

tR

Cb = Total capacitance of one bus line in pF

 

ns

Signals (Receiving)

0.1 x Cb

 

 

 

 

 

 

 

Fall Time for Both SDA and SCL

 

tF

Cb = Total capacitance of one bus line in pF

20 +

 

300

ns

Signals (Receiving)

 

0.1 x Cb

 

 

 

 

 

 

 

 

Fall Time for Both SDA and SCL

 

tF

Cb = Total capacitance of one bus line in pF

20 +

 

250

ns

Signals (Transmitting)

 

0.1 x Cb

 

 

 

 

 

 

 

 

Set-Up Time for STOP Condition

 

tSU,STO

 

0.6

 

 

µs

 

 

 

 

 

 

 

 

Capacitive Load for Each

 

Cb

 

 

 

400

pF

Bus Line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pulse Width of Spike Suppressed

 

tSP

 

0

 

50

ns

 

 

 

 

 

 

 

 

MAX127/MAX128

_______________________________________________________________________________________ 5

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