Rainbow Electronics MAX1362 User Manual

General Description

The MAX1361/MAX1362 low-power, 10-bit, 4-channel,
analog-to-digital converters (ADCs) feature a digitally
programmable window comparator with an interrupt out­put for automatic system-monitoring applications. Once
configured, monitor mode automatically asserts an inter­rupt when any analog input exceeds the programmed
upper or lower thresholds, without interaction to the
host. The MAX1361/MAX1362 respond to the SMBus™
alert, allowing quick identification of the alarming device
on a shared interrupt. A programmable delay between
monitoring intervals lowers power consumption at
reduced monitoring rates.

In addition, the MAX1361/MAX1362 integrate an inter­nal voltage reference, a clock, and a 1.7MHz, high­speed, I2C™-compatible, 2-wire, serial interface. The
optimized interface allows a maximum conversion rate
of 94.4ksps in normal mode while reading back the
conversion results. Each of the four analog inputs is
configurable for single-ended or fully differential opera­tion and unipolar or bipolar operation. Two scan modes
utilize on-chip random access memory (RAM) to allow
eight conversions of a selected channel or scanning of
a group of channels to reduce interface overhead.

These devices operate from a single 2.7V to 3.6V
(MAX1361) or 4.5V to 5.5V (MAX1362) supply and
require only 436µA at the maximum sampling rate of
150ksps in monitor mode and 670µA at the maximum
sampling rate of 94.4ksps. AutoShutdown™ powers
down the devices between conversions, reducing sup­ply current to less than 0.5µA when idle.

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 MAX1361 features
a 2.048V internal reference, and the MAX1362 features
a 4.096V internal reference.

The MAX1361/MAX1362 are available in a 10-pin
µMAX®package and are specified over the extended
(-40°C to +85°C) temperature range. For 12-bit applica­tions, refer to the pin-compatible MAX1363/MAX1364
data sheet.

Applications

System Monitoring/Supervision
Servers/Workstations
High Reliability Power Supplies
Medical Instrumentation

Features

♦ Monitor Mode

Programmable Lower/Upper Trip Threshold
Alarm-Status Register Records Fault Events
SMBus Alert Response
Programmable Sampling Intervals

♦ 10-Bit I2C-Compatible ADC

±1 LSB INL, ±1 LSB DNL

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

Differential Inputs

♦ Software Programmable Bipolar/Unipolar

Conversions

♦ Fast Sampling Rate

94.4ksps While Continuously Reading
Conversions
150ksps in Monitor Mode

♦ High-Speed I2C-Compatible Serial Interface

100kHz/400kHz Standard/Fast Mode
Up to 1.7MHz High-Speed Mode
6 Available I2C Slave Addresses

♦ Single Supply

2.7V to 3.6V (MAX1361)

4.5V to 5.5V (MAX1362)

♦ Internal Reference

2.048V (MAX1361)

4.096V (MAX1362)

♦ External Reference: 1V to V

DD

♦ Low Power

436µA in Monitor Mode (150ksps)
670µA at 94.4ksps
6µA at 1ksps

0.5µA in Power-Down Mode

♦ Small Package

10-Pin µMAX

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitors with Programmable

Trip Window and SMBus Alert Response

________________________________________________________________ Maxim Integrated Products 1

Ordering Information/Selector Guide

19-3268; Rev 1; 7/04

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.

PART TEMP RANGE PIN-PACKAGE I2C SLAVE ADDRESS

SUPPLY VOLTAGE (V)

MAX1361EUB -40°C to +85°C 10 µMAX 0110100/0110101 2.7 to 3.6

MAX1361LEUB* -40°C to +85°C 10 µMAX 0110010/0110011 2.7 to 3.6
MAX1361MEUB* -40°C to +85°C 10 µMAX 0110110/0110111 2.7 to 3.6

SMBus is a trademark of Intel Corporation.
I2C is a trademark of Philips Corporation. Purchase of I2C compo­nents from Maxim Integrated Products, Inc. or one of its subli­censed Associated Companies, conveys a license under the
Philips I2C Patent Rights to use these components in an I2C sys­tem, provided that the system conforms to the I

2

C Standard
Specification as defined by Philips.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.

Typical Operating Circuit and Pin Configuration appear at
end of data sheet.

Ordering Information/Selector Guide continued at end of data sheet.

*Future product—contact factory for availability.

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 2.7V to 3.6V (MAX1361), VDD= 4.5V to 5.5V (MAX1362), V

REF

= 2.048V (MAX1361), V

REF

= 4.096V (MAX1362), C

REF

=

0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +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.

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

AIN0–AIN3, A0, REF to GND......................-0.3V to (V

DD

+ 0.3V)

SDA, SCL,

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

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

Continuous Power Dissipation (T

A

= +70°C)

10-Pin µMAX (derate 5.6mW/°C above +70°C)........444.4mW

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 (f

SAMPLE

= 94.4ksps) (Note 1)

Resolution 10 Bits
Relative Accuracy INL (Note 2) ±1 LSB
Differential Nonlinearity DNL No missing codes ±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 SINAD 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) t

CONV

External clock

µs

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

Throughput Rate (Note 5)

Monitor mode, SCAN[1:0] = 10 150

ksps

SYMBOL

MIN TYP MAX

f

SAMPLE

10.6

±0.1

±0.1

94.4

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable

Trip Window and SMBus Alert Response

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1361), VDD= 4.5V to 5.5V (MAX1362), V

REF

= 2.048V (MAX1361), V

REF

= 4.096V (MAX1362), C

REF

=

0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Track/Hold Acquisition Time

ns

Internal Clock Frequency 2.8

MHz

External clock, fast mode 60

Aperture Delay (Note 6) t

AD

External clock, high-speed mode 30

ns

ANALOG INPUT (AIN0–AIN3)

Unipolar 0

Input Voltage Range, Single­Ended and Differential (Note 7)

Bipolar

V

Input Multiplexer Leakage
Current

±1 µA

Input Capacitance C

IN

22 pF

INTERNAL REFERENCE (Note 8)

MAX1361

Reference Voltage V

REF

TA = +25°C

MAX1362

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 V

REF

(Note 9) 1

V

REF Input Current I

REF

f

SAMPLE

= 94.4ksps 40 µA

DIGITAL INPUTS/OUTPUTS (SCL, SDA, A0)

Input High Voltage V

IH

0.7 x V

DD

V

Input Low Voltage V

IL

V

Input Hysteresis V

HYST

0.1 x V

DD

V

Input Current I

IN

±10 µA

Input Capacitance C

IN

15 pF

Output Low Voltage V

OL

I

SINK

= 3mA 0.4 V

INT OUTPUT

Output Low Voltage I

SINK

= 3mA 0.4 V

INT Leakage Current No faults detected

µA

Output Capacitance 15 pF

POWER REQUIREMENTS

MAX1361 2.7 3.6

Supply Voltage V

DD

MAX1362 4.5 5.5

V

ON/OFF leakage current, V

TCV

REF

= 0 or V

AIN_

800

-V

/ 2 +V

REF

DD

2.027 2.048 2.068

4.055 4.096 4.137

±0.01

0.3 x V

V

REF

REF

V

±10

/ 2

DD

DD

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1361), VDD= 4.5V to 5.5V (MAX1362), V

REF

= 2.048V (MAX1361), V

REF

= 4.096V (MAX1362), C

REF

=

0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER

CONDITIONS

UNITS

Internal

f

SAMPLE

=
150ksps,
monitor mode
(Note 10)

External

Internal

f

SAMPLE

=

94.4ksps, external
clock

External

900

Internal

f

SAMPLE

= 40ksps,
internal clock

External

Internal

internal clock

External

60

Internal

f

SAMPLE

= 1ksps,
internal clock

External

6

Internal

f

SAMPLE

=
150ksps,
monitor mode
(Note10)

External

Internal

f

SAMPLE

=

94.4ksps, external
clock

External

900

Internal

internal clock

External

Internal

f

SAMPLE

= 10ksps,
internal clock

External

60

Internal

Supply Current I

DD

f

SAMPLE

= 1ksps,
internal clock

External

6

µA

Internal reference on

Shutdown Current

Internal reference off 0.5 10

µA

Power-Supply Rejection Ratio PSRR Full-scale input (Note 11)

LSB/V

TIMING CHARACTERISTICS FOR FAST MODE (Figures 1a, 2)

Serial Clock Frequency f

SCL

400 kHz

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

t

BUF

1.3 µs

SYMBOL

MIN TYP MAX

660 1600

MAX1361

MAX1362

f

SAMPLE

f

SAMPLE

= 10ksps,

= 40ksps,

reference

reference

reference

reference

reference

reference

reference

reference

reference

reference

436 1350

900 1150
670
530
230
380

330

666 1600

436 1350

900 1150
670
530
230
380

330

330

±0.01 ±0.5

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable

Trip Window and SMBus Alert Response

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1361), VDD= 4.5V to 5.5V (MAX1362), V

REF

= 2.048V (MAX1361), V

REF

= 4.096V (MAX1362), C

REF

=

0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Hold Time for START (S)
Condition

0.6 µs

Low Period of the SCL Clock t

LOW

1.3 µs

High Period of the SCL Clock t

HIGH

0.6 µs

Setup Time for a Repeated
START Condition (Sr)

0.6 µs

Data Hold Time

0 900 ns

Data Setup Time

ns

Rise Time of Both SDA and SCL
Signals, Receiving

t

R

Measured from 0.3VDD to 0.7V

DD

0 300 ns

Fall Time of SDA Transmitting

t

F

Measured from 0.3VDD to 0.7V

DD 0

300 ns

Setup Time for STOP (P)
Condition

0.6 µs

Capacitive Load for Each Bus
Line

C

B

400 pF

Pulse Width of Spike Suppressed

50 ns

TIMING CHARACTERISTICS FOR HIGH-SPEED MODE (CB = 400pF, Figures 1a, 2) (Note 12)

Serial Clock Frequency f

SCLH

(Note 13) 1.7

MHz

Hold Time, Repeated START
Condition (Sr)

ns

Low Period of the SCL Clock t

LOW

(Note 13)

ns

High Period of the SCL Clock t

HIGH

ns

Setup Time for a Repeated
START Condition (Sr)

ns

Data Hold Time

(Note 14) 0 150 ns

Data Setup Time

10 ns

Rise Time of SCL Signal 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

Setup Time for STOP (P)
Condition

ns

Capacitive Load for Each Bus

C

B

400 pF

Pulse Width of Spike Suppressed

010ns

t

HD, STA

t

SU, STA

t

HD, DAT

t

SU, DAT

t

SU, STO

t

HD, STA

t

SU, STA

t

HD, DAT

t

SU, DAT

t

SU, STO

100

160
320

120
160

160

Typical Operating Characteristics

(VDD= 3.3V (MAX1361), VDD= 5V (MAX1362), f

SCL

= 1.7MHz, external clock, f

SAMPLE

= 94.4ksps, single-ended, unipolar,

TA= +25°C, unless otherwise noted.)

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1361), VDD= 4.5V to 5.5V (MAX1362), V

REF

= 2.048V (MAX1361), V

REF

= 4.096V (MAX1362), C

REF

=

0.1µF, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Note 1: Devices 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 gain and offset 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: The throughput rate of the I

2

C bus is limited to 94.4ksps. The MAX1361/MAX1362 can perform conversions up to 150ksps

in monitor mode when not reading back results on the I

2

C bus.

Note 6: A filter on the SDA and SCL inputs suppresses noise spikes and delays the sampling instant.
Note 7: The absolute input voltage range for the analog inputs (AIN0–AIN3) is from GND to V

DD

.

Note 8: When the internal reference is configured to be available at AIN3/REF (SEL[2:1] = 11), decouple AIN3/REF to GND with a

0.01µF capacitor.

Note 9: ADC performance is limited by the converter’s noise floor, typically 300µV

P-P

.

Note 10: Maximum conversion throughput in internal clock mode when the data is not clocked out.
Note 11: For the MAX1361, PSRR is measured as

and for the MAX1362, PSRR is measured as

Note 12: C

B

= total capacitance of one bus line in pF.

Note 13: f

SCLH

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

Note 14: A master device must provide a data hold time for SDA (referred to V

IL

of SCL) to bridge the undefined region of SCL’s

falling edge.

VVVV

V

VV

FS FS

N

REF

(. ) (. )

(. . )

55 45

21

55 45

−

[]

×

−

⎡

⎣

⎢
⎢

⎤

⎦

⎥
⎥

−

VVVV

V

VV

FS FS

N

REF

(. ) (. )

(. . )

36 27

21

36 27

−

[]

×

−

⎡

⎣

⎢
⎢

⎤

⎦

⎥
⎥

−

-160

-140

-120

-100

-80

-60

-40

-20

0

0 1020304050

FFT PLOT

MAX1361 toc03

FREQUENCY (kHz)

AMPLITUDE (dBc)

f

SAMPLE

= 94.4ksps

f

IN

= 10kHz

-0.3

-0.1

-0.2

0.1

0

0.2

0.3

0 1000

DIFFERENTIAL NONLINEARITY

vs. DIGITAL CODE

MAX1361 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

0 400200 600 800 1000

INTEGRAL NONLINEARITY

vs. DIGITAL CODE

MAX1361 toc02

DIGITAL OUTPUT CODE

INL (LSB)

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable

Trip Window and SMBus Alert Response

_______________________________________________________________________________________ 7

300

400
350

500
450

600
550

650

750
700

800

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

SUPPLY CURRENT vs. TEMPERATURE

MAX1361 toc04

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

INTERNAL REFERENCE

MAX1362

MAX1361

MAX1362

MAX1361

INTERNAL REFERENCE

EXTERNAL REFERENCE

EXTERNAL REFERENCE

SETUP BYTE
EXT REF: 10111010
INT REF: 11011010

0

0.2

0.1

0.4

0.3

0.5

0.6

2.7 5.2

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX1361 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

MAX1361 toc06

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

MAX1362

MAX1361

200

300
250

350

400

450

500

550

600

650

700

750

800

0 20 30 40 60 80 100

AVERAGE SUPPLY CURRENT

vs. CONVERSION RATE (EXTERNAL CLOCK)

MAX1361 toc07

CONVERSION RATE (ksps)

AVERAGE I

DD

(µA)

010 50 70 90

A

B

A) INTERNAL REFERENCE ALWAYS ON
B) EXTERNAL REFERENCE

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

MAX1361 toc08

TEMPERATURE (°C)

V

REF

NORMALIZED

MAX1362

MAX1361

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

MAX1361 toc09

VDD (V)

V

REF

NORMALIZED

MAX1362
NORMALIZED TO
REFERENCE VALUE AT
V

DD

= 5V

MAX1361
NORMALIZED TO
REFERENCE VALUE AT
V

DD

= 3.3V

-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 2035506580

OFFSET ERROR vs. TEMPERATURE

MAX1361 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

MAX1361 toc11

VDD (V)

OFFSET ERROR (LSB)

Typical Operating Characteristics (continued)

(VDD= 3.3V (MAX1361), VDD= 5V (MAX1362), f

SCL

= 1.7MHz, external clock, f

SAMPLE

= 94.4ksps, single-ended, unipolar,

TA= +25°C, unless otherwise noted.)

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 2035506580

GAIN ERROR vs. TEMPERATURE

MAX1361 toc12

TEMPERATURE (°C)

GAIN ERROR (LSB)

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response

8 _______________________________________________________________________________________

PIN NAME FUNCTION

1 AIN0 Analog Input
2 AIN1 Analog Input
3 AIN2 Analog Input
4 AIN3/V

REF

Analog Input or Reference Input or Output. See Table 3.

5A0I

2

C Address Select Input. Connect to VDD or GND. See Table 1.
6 INT Active-Low, Open-Drain Interrupt Output
7 SCL I2C Clock Input
8 SDA I2C Data Input/Output
9 GND Ground

10 V

DD

Positive Supply Voltage. Bypass V

DD

to GND with a 0.1µF capacitor.

Pin Description

MAX1361/MAX1362

10-BIT

ADC

4:1

MUX

CONTROL

TRIP

THRESHOLDS

I2C

INTERFACE

SDA
SCL
A0

INT

CLK

INT
REF

GND

V

DD

AIN0

AIN1

AIN2

AIN3/

REF

Functional Diagram

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

MAX1361 toc13

VDD (V)

GAIN ERROR (LSB)

MONITOR-MODE SUPPLY CURRENT

vs. SPEED

MAX1361 toc14

SPEED (ksps)

SUPPLY CURRENT (µA)

125100755025

100

200

300

400

500

600

700

0

0 150

INTERNAL REF

EXTERNAL REF

Typical Operating Characteristics (continued)

(VDD= 3.3V (MAX1361), VDD= 5V (MAX1362), f

SCL

= 1.7MHz, external clock, f

SAMPLE

= 94.4ksps, single-ended, unipolar,

TA= +25°C, unless otherwise noted.)