Rainbow Electronics MAX1139 User Manual

General Description

The MAX1136–MAX1139 low-power, 10-bit, multichan­nel analog-to-digital converters (ADCs) feature internal
track/hold (T/H), voltage reference, clock, and an
I2C™-compatible 2-wire serial interface. These devices
operate from a single supply of 2.7V to 3.6V (MAX1137/
MAX1139) or 4.5V to 5.5V (MAX1136/MAX1138) and
require only 670µA at the maximum sampling rate of

94.4ksps. Supply current falls below 230µA for sam­pling rates under 46ksps. AutoShutdown™ powers
down the devices between conversions, reducing sup­ply current to less than 1µA at low throughput rates.
The MAX1136/MAX1137 have four analog input chan­nels each, while the MAX1138/MAX1139 have 12 ana­log input channels each. The fully differential analog
inputs are software configurable for unipolar or bipolar,
and single ended or differential operation.

The full-scale analog input range is determined by the
internal reference or by an externally applied reference
voltage ranging from 1V to VDD. The MAX1137/
MAX1139 feature a 2.048V internal reference and the
MAX1136/MAX1138 feature a 4.096V internal reference.

The MAX1136/MAX1137 are available in an 8-pin µMAX
package. The MAX1138/MAX1139 are available in a
16-pin QSOP package. The MAX1136–MAX1139 are
guaranteed over the extended temperature range
(-40°C to +85°C). For pin-compatible 12-bit parts, refer
to the MAX1136–MAX1139 data sheet. For pin-compati­ble 8-bit parts, refer to the MAX1036–MAX1039 data
sheet.

Applications

Hand-Held Portable Applications

Medical Instruments

Battery-Powered Test Equipment

Solar-Powered Remote Systems

Received-Signal-Strength Indicators

System Supervision

Features

♦ High-Speed I2C-Compatible Serial Interface

400kHz Fast Mode

1.7MHz High-Speed Mode

♦ Single-Supply

2.7V to 3.6V (MAX1137/MAX1139)

4.5V to 5.5V (MAX1136/MAX1138)

♦ Internal Reference

2.048V (MAX1137/MAX1139)

4.096V (MAX1136/MAX1138)

♦ External Reference: 1V to V

DD

♦ Internal Clock

♦ 4-Channel Single-Ended or 2-Channel Fully

Differential (MAX1136/MAX1137)

♦ 12-Channel Single-Ended or 6-Channel Fully

Differential (MAX1138/MAX1139)

♦ Internal FIFO with Channel-Scan Mode

♦ Low Power

670µA at 94.4ksps
230µA at 40ksps
60µA at 10ksps
6µA at 1ksps

0.5µA in Power-Down Mode

♦ Software-Configurable Unipolar/Bipolar

♦ Small Packages

8-Pin µMAX (MAX1136/MAX1137)
16-Pin QSOP (MAX1138/MAX1139)

MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2334; Rev 1; 4/02

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.

Typical Operating Circuit appears at end of data sheet.

Selector Guide appears at end of data sheet.

PART

TEMP

RANGE

PIN-

INL

(LSB)

MAX1136EUA

8 µMAX ±1

MAX1137EUA

8 µMAX ±1

MAX1138EEE

16 QSOP ±1

MAX1139EEE

16 QSOP ±1

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

I

2

C is a trademark of Philips Corp.

PACKAGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 2.7V to 3.6V (MAX1137/MAX1139), VDD= 4.5V to 5.5V (MAX1136/MAX1138), V

REF

= 2.048V (MAX1137/MAX1139), V

REF

=

4.096V (MAX1136/MAX1138), C

REF

= 0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C. See Tables 1–5 for programming notation.)

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.

VDDto GND..............................................................-0.3V to +6V

AIN0–AIN11,

REF to GND............-0.3V to the lower of (VDD+ 0.3V) and 6V

SDA, SCL to GND.....................................................-0.3V to +6V

Maximum Current Into Any Pin .........................................±50mA

Continuous Power Dissipation (TA= +70°C)

8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW

16-Pin QSOP (derate 8.3mW/°C above +70°C)........666.7mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

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

PARAMETER

CONDITIONS

UNITS

DC ACCURACY (Note 1)

Resolution 10 Bits

Relative Accuracy INL (Note 2) ±1 LSB

Differential Nonlinearity DNL No missing codes over temperature ±1 LSB

Offset Error ±1 LSB

Offset-Error Temperature
Coefficient

Relative to FSR 0.3

ppm/°C

Gain Error (Note 3) ±1 LSB

Gain-Temperature Coefficient Relative to FSR 0.3

ppm/°C

Channel-to-Channel Offset
Matching

LSB

Channel-to-Channel Gain
Matching

LSB

DYNAMIC PERFORMANCE (f

IN(SINE-WAVE)

= 10kHz, V

IN(P-P)

= V

REF

, f

SAMPLE

= 94.4ksps)

Signal-to-Noise Plus Distortion

60 dB

Total Harmonic Distortion THD Up to the 5th harmonic -70 dB

Spurious Free Dynamic Range SFDR 70 dB

Full-Power Bandwidth SINAD > 57dB 3.0

MHz

Full-Linear Bandwidth -3dB point 5.0

MHz

CONVERSION RATE

Internal clock 6.8

Conversion Time (Note 4)

External clock

µs

Internal clock, SCAN[1:0] = 01 53

Internal clock, SCAN[1:0] = 00
CS[3:0] = 1011 (MAX1138/MAX1139)

53

Throughput Rate

External clock

ksps

Track/Hold Acquisition Time

ns

SYMBOL

MIN TYP MAX

SINAD

t

CONV

f

SAMPLE

±0.1

±0.1

10.6

94.4

800

MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1137/MAX1139), VDD= 4.5V to 5.5V (MAX1136/MAX1138), V

REF

= 2.048V (MAX1137/MAX1139), V

REF

=

4.096V (MAX1136/MAX1138), C

REF

= 0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C. See Tables 1–5 for programming notation.)

PARAMETER

CONDITIONS

UNITS

Internal Clock Frequency 2.8

MHz

External clock, fast mode 60

Aperture Delay (Note 5) t

AD

External clock, high-speed mode 30

ns

ANALOG INPUT (AIN0–AIN11)

Unipolar 0

Input-Voltage Range, Single­Ended and Differential (Note 6)

Bipolar 0

V

ON/OFF leakage current, VAIN_ = 0 or VDD

±1 µA

Input Capacitance CIN 22 pF

INTERNAL REFERENCE (Note 7)

MAX1137/MAX1139

Reference Voltage VREF TA = +25°C

MAX1136/MAX1138

V

Reference-Voltage Temperature
Coefficient

25

ppm/°C

REF Short-Circuit Current 2mA
REF Source Impedance 1.5 kΩ

EXTERNAL REFERENCE

REF Input-Voltage Range VREF (Note 8) 1

V

REF Input Current IREF f

SAMPLE

= 94.4ksps 40 µA

DIGITAL INPUTS/OUTPUTS (SCL, SDA)

Input High Voltage V

IH

V

Input Low Voltage V

IL

V

Input Hysteresis

V

Input Current I

IN

V

IN

0 to V

DD

±10 µA

Input Capacitance C

IN

15 pF

Output Low Voltage V

OL

I

SINK

= 3mA 0.4 V

POWER REQUIREMENTS

MAX1137/MAX1139 2.7 3.6

Supply Voltage V

DD

MAX1136/MAX1138 4.5 5.5

V

Internal reference 900

external clock

External reference 670

Internal reference 530

f

SAMPLE

= 40ksps

internal clock

External reference 230

Internal reference 380

f

SAMPLE

= 10ksps

internal clock

External reference 60

Internal reference 330

f

SAMPLE

=1ksps

internal clock

External reference 6

µA

Supply Current I

DD

Shutdown (internal reference OFF) 0.5

SYMBOL

TCVREF

V

HYST

Input Multiplexer Leakage Current

MIN TYP MAX

±0.01

1.968 2.048 2.128

3.939 4.096 4.256

0.7 ✕ V

DD

0.1 ✕ V

DD

V

±V

REF

VDD

0.3 ✕ V

REF

DD

/2

f

= 94.4ksps

SAMPLE

1150

900

110

MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1137/MAX1139), VDD= 4.5V to 5.5V (MAX1136/MAX1138), V

REF

= 2.048V (MAX1137/MAX1139), V

REF

=

4.096V (MAX1136/MAX1138), C

REF

= 0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C. See Tables 1–5 for programming notation.)

TIMING CHARACTERISTICS (Figure 1)

(VDD= 2.7V to 3.6V (MAX1137/MAX1139), VDD= 4.5V to 5.5V (MAX1136/MAX1138), V

REF

= 2.048V (MAX1137/MAX1139), V

REF

=

4.096V (MAX1136/MAX1138), C

REF

= 0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C. See Tables 1–5 for programming notation.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER REQUIREMENTS

Power-Supply Rejection Ratio PSRR Full-scale input (Note 9)

LSB/V

,

,

,

,

,

,

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TIMING CHARACTERISTICS FOR FAST MODE

Serial Clock Frequency f

Bus Free Time Between a
STOP (P) and a
START (S) Condition

Hold Time for START (S) Condition t

Low Period of the SCL Clock t

High Period of the SCL Clock t

Setup Time for a Repeated START
Condition (Sr)

Data Hold Time t

Data Setup Time t

Rise Time of Both SDA and SCL
Signals, Receiving

Fall Time of SDA Transmitting

Setup Time for STOP (P) Condition t

Capacitive Load for Each Bus Line C

Pulse Width of Spike Suppressed t

TIMING CHARACTERISTICS FOR HIGH-SPEED MODE (CB = 400pF, Note 11)

Serial Clock Frequency f

Hold Time, Repeated START
Condition (Sr)

Low Period of the SCL Clock t

High Period of the SCL Clock t

Setup Time for a Repeated START
Condition (Sr)

Data Hold Time tHD,

Data Setup Time tSU,

SCL

t

BUF

HD

LOW

HIGH

t

SU

HD

SU

DAT

t

R

t

F

SU

STO

B

SP

SCLH

t

HD

LOW

HIGH

t

SU, STA

DAT

STA

STA

(Note 10) 0 900 ns

DAT

Measured from 0.3VDD to 0.7V

Measured from 0.3VDD to 0.7V

(Note 12) 1.7 MHz

STA

(Note 10) 0 150 ns

DAT

DD

DD

1.3 µs

0.6 µs

1.3 µs

0.6 µs

0.6 µs

100 ns

20 + 0.1C

20 + 0.1C

0.6 µs

160 ns

320 ns

120 ns

160 ns

10 ns

±0.01 ±0.5

B

B

400 kHz

300 ns

300 ns

400 pF

50 ns

Note 1: For DC accuracy, the MAX1136/MAX1138 are tested at VDD= 5V and the MAX1137/MAX1139 are tested at VDD= 3V. All

devices are configured for unipolar, single-ended inputs.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range and

offsets have been calibrated.

Note 3: Offset nulled.
Note 4: Conversion time is defined as the number of clock cycles needed for conversion multiplied by the clock period. Conversion

time does not include acquisition time. SCL is the conversion clock in the external clock mode.

Note 5: A filter on the SDA and SCL inputs suppresses noise spikes and delays the sampling instant.
Note 6: The absolute input-voltage range for the analog inputs (AIN0–AIN11) is from GND to V

DD

.

Note 7: When the internal reference is configured to be available at AIN_/REF (SEL[2:1] = 11) decouple AIN_/REF to GND with a

0.01µF capacitor.

Note 8: ADC performance is limited by the converter’s noise floor, typically 300µV

P-P

.

Note 9: Measured as for the MAX1137/MAX1139

and for the MAX1136/MAX1138

Note 10: A master device must provide a data hold time for SDA (referred to V

IL

of SCL) in order to bridge the undefined region of

SCL’s falling edge (see Figure 1).

Note 11: C

B

= total capacitance of one bus line in pF.

Note 12: f

SCL

must meet the minimum clock low time plus the rise/fall times.

VVVV

V

VV

FS FS

REF

N

(. ) (. )

(. . )

55 45

21

55 45

−

−

−

[]

×











VVVV

V

VV

FS FS

REF

N

(. ) (. )

(. . )

36 27

21

36 27

−

−

−

[]

×











MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS (Figure 1) (continued)

(VDD= 2.7V to 3.6V (MAX1137/MAX1139), VDD= 4.5V to 5.5V (MAX1136/MAX1138), V

REF

= 2.048V (MAX1137/MAX1139), V

REF

=

4.096V (MAX1136/MAX1138), C

REF

= 0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C. See Tables 1–5 for programming notation.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Rise Time of SCL Signal
(Current Source Enabled)

t

RCL

Measured from 0.3VDD to 0.7V

DD

20 80 ns

Rise Time of SCL Signal after
Acknowledge Bit

t

RCL1

Measured from 0.3VDD to 0.7V

DD

20 160 ns

Fall Time of SCL Signal t

FCL

Measured from 0.3VDD to 0.7V

DD

20 80 ns

Rise Time of SDA Signal t

RDA

Measured from 0.3VDD to 0.7V

DD

20 160 ns

Fall Time of SDA Signal t

FDA

Measured from 0.3VDD to 0.7V

DD

20 160 ns

ns

C

B

400 pF

t

SP

(Notes 10 and 12) 0 10 ns

Setup Time for STOP (P) Condition tSU,

Capacitive Load for Each Bus Line

Pulse Width of Spike Suppressed

STO

160

MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= 3.3V (MAX1137/MAX1139), VDD= 5V (MAX1136/MAX1138), f

SCL

= 1.7MHz, external clock, f

SAMPLE

= 94.4ksps, single-

ended, unipolar, TA= +25°C, unless otherwise noted.)

-0.3

-0.1

-0.2

0.1

0

0.2

0.3

0 1000

DIFFERENTIAL NONLINEARITY

vs. DIGITAL CODE

MAX1136 toc01

DIGITAL OUTPUT CODE

DNL (LSB)

400200 600 800

-0.5

-0.2

-0.3

-0.4

-0.1

0

0.1

0.2

0.3

0.4

0.5

0400200 600 800 1000

INTEGRAL NONLINEARITY

vs. DIGITAL CODE

MAX1136 toc02

DIGITAL OUTPUT CODE

INL (LSB)

-160

-140

-120

-100

-80

-60

-40

-20

0

0 10k 20k 30k 40k 50k

FFT PLOT

MAX1136 toc03

FREQUENCY (Hz)

AMPLITUDE (dBc)

f

SAMPLE

= 94.4ksps

f

IN

= 10kHz

300

400

350

500

450

600

550

650

750

700

800

-40 -10 5-25 20 35 50 65 80

SUPPLY CURRENT vs. TEMPERATURE

(MAX1138/MAX1139)

MAX1136 toc04

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

INTERNAL REFERENCE

MAX1138/1136

MAX1139/1137

MAX1138/1136

MAX1139/1137

INTERNAL REFERENCE

EXTERNAL REFERENCE

EXTERNAL REFERENCE

SETUP BYTE
EXT REF: 10111011
INT REF: 11011011

0

0.2

0.1

0.4

0.3

0.5

0.6

2.7 5.2

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX1136 toc05

INPUT VOLTAGE (V)

I

DD

(µA)

3.73.2 4.2 4.7

SDA = SCL = V

DD

0

0.10

0.05

0.20

0.15

0.30

0.25

0.35

0.45

0.40

0.50

-40 -10 5

-25

20 35 50 65 80

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX1136 toc06

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

MAX1138

MAX1139

200

300
250

350

400

450

500

550

600

650

700

750

800

02030406080100

AVERAGE SUPPLY CURRENT vs.

CONVERSION RATE (EXTERNAL CLOCK)

MAX1136 toc07

CONVERSION RATE (ksps)

AVERAGE I

DD

(µA)

010 50 70 90

A

B

A) INTERNAL REFERENCE ALWAYS ON
B) EXTERNAL REFERENCE

MAX1138

0.9990

0.9994

0.9992

0.9998

0.9996

1.0002

1.0000

1.0004

1.0008

1.0006

1.0010

-40 -10 5-25 20 35 50 65 80

INTERNAL REFERENCE VOLTAGE

vs. TEMPERATURE

MAX1136 toc08

TEMPERATURE (°C)

V

REF

NORMALIZED

MAX1138

MAX1139

NORMALIZED TO REFERENCE VALUE
AT +25°C

0.99990

0.99994

0.99992

0.99998

0.99996

1.00002

1.00000

1.00004

1.00008

1.00006

1.00010

2.7 3.3 3.6 3.93.0 4.2 4.5 4.8 5.1 5.4

NORMALIZED REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX1136 toc09

VDD (V)

V

REF

NORMALIZED

MAX1138/MAX1136,
NORMALIZED TO
REFERENCE VALUE AT
V

DD

= 5V

MAX1139/MAX1137,
NORMALIZED TO
REFERENCE VALUE AT
V

DD

= 3.3V

MAX1136–MAX1139

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VDD= 3.3V (MAX1137/MAX1139), VDD= 5V (MAX1136/MAX1138), f

SCL

= 1.7MHz, external clock, f

SAMPLE

= 94.4ksps, single-

ended, unipolar, TA= +25°C, unless otherwise noted.)

-1.0

-0.8

-0.9

-0.6

-0.7

-0.4

-0.5

-0.3

-0.1

-0.2

0

-40 -10 5-25 2035 506580

OFFSET ERROR vs. TEMPERATURE

MAX1136 toc10

TEMPERATURE (°C)

OFFSET ERROR (LSB)

-1.0

-0.8

-0.9

-0.6

-0.7

-0.4

-0.5

-0.3

-0.1

-0.2

0

2.7 3.3 3.6 3.93.0 4.2 4.5 4.8 5.1 5.4

OFFSET ERROR vs. SUPPLY VOLTAGE

MAX1136 toc11

VDD (V)

OFFSET ERROR (LSB)

0

0.2

0.1

0.4

0.3

0.6

0.5

0.7

0.9

0.8

1.0

-40 -10 5-25 20 35 50 65 80

GAIN ERROR vs. TEMPERATURE

MAX1136 toc12

TEMPERATURE (°C)

GAIN ERROR (LSB)

0

0.3

0.2

0.1

0.4

0.5

0.6

0.7

0.8

0.9

1.0

2.7 3.73.2 4.2 4.7 5.2

GAIN ERROR vs. SUPPLY VOLTAGE

MAX1136 toc13

VDD (V)

GAIN ERROR (LSB)