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 out-
put for automatic system-monitoring applications. Once
configured, monitor mode automatically asserts an inter-
rupt when any analog input exceeds the programmed
upper or lower thresholds, without interaction to the
host. The MAX1361/MAX1362 respond to the SMBusTM
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 inter-
nal voltage reference, a clock, and a 1.7MHz, high-
speed, I
2
CTM-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 opera-
tion 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. AutoShutdownTM powers
down the devices between conversions, reducing sup-
ply 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 V
DD
. 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 applica-
tions, 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 I
2
C-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 I
2
C-Compatible Serial Interface
100kHz/400kHz Standard/Fast Mode
Up to 1.7MHz High-Speed Mode
6 Available I
2
C 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
I
2
C SLAVE ADDRESS
SUPPLY VOLTAGE (V)
MAX1361
EUB
-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.
I
2
C is a trademark of Philips Corporation. Purchase of I
2
C compo-
nents from Maxim Integrated Products, Inc. or one of its subli-
censed Associated Companies, conveys a license under the
Philips I
2
C Patent Rights to use these components in an I
2
C sys-
tem, 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
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +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.
V
DD
to GND ..............................................................-0.3V to +6V
AIN0AIN3, 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
SYMBOL
CONDITIONS
MIN
TYP
MAX
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
±0.1
LSB
Channel-to-Channel Gain
Matching
±0.1
LSB
DYNAMIC PERFORMANCE (f
IN(SINE-WAVE)
= 10kHz, V
IN(P-P)
= V
REF, fSAMPLE
= 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
10.6
µs
Internal clock, SCAN[1:0] = 01
53
External clock
94.4
Throughput Rate (Note 5)
f
SAMPLE
Monitor mode, SCAN[1:0] = 10
150
ksps
MAX1361/MAX1362
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Track/Hold Acquisition Time
800
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 (AIN0AIN3)
Unipolar
0
V
REF
Input Voltage Range, Single-
Ended and Differential (Note 7)
Bipolar
-V
REF
/ 2
+V
REF
/ 2
V
Input Multiplexer Leakage
Current
ON/OFF leakage current, V
AIN_
= 0 or V
DD
±0.01
±1
µA
Input Capacitance
C
IN
22
pF
INTERNAL REFERENCE (Note 8)
MAX1361
2.027
2.048
2.068
Reference Voltage
V
REF
T
A
= +25°C
MAX1362
4.055
4.096
4.137
V
Reference-Voltage Temperature
Coefficient
TCV
REF
25
ppm/°C
REF Short-Circuit Current
2
mA
REF Source Impedance
1.5
k
EXTERNAL REFERENCE
REF Input Voltage Range
V
REF
(Note 9)
1
V
DD
V
REF Input Current
I
REF
f
SAMPLE
= 94.4ksps
40
µA
DIGITAL INPUTS/OUTPUTS (SCL, SDA, A
0
)
Input High Voltage
V
IH
0.7 x V
DD
V
Input Low Voltage
V
IL
0.3 x V
DD
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
±10
µA
Output Capacitance
15
pF
POWER REQUIREMENTS
MAX1361
2.7
3.6
Supply Voltage
V
DD
MAX1362
4.5
5.5
V
MAX1361/MAX1362
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Internal
660
1600
f
SAMPLE
=
150ksps,
monitor mode
(Note 10)
External
reference
436
1350
Internal
900
1150
f
SAMPLE
=
94.4ksps, external
clock
External
reference
670
900
Internal
530
f
SAMPLE
= 40ksps,
internal clock
External
reference
230
Internal
380
f
SAMPLE
= 10ksps,
internal clock
External
reference
60
Internal
330
MAX1361
f
SAMPLE
= 1ksps,
internal clock
External
reference
6
Internal
666
1600
f
SAMPLE
=
150ksps,
monitor mode
(Note10)
External
reference
436
1350
Internal
900
1150
f
SAMPLE
=
94.4ksps, external
clock
External
reference
670
900
Internal
530
f
SAMPLE
= 40ksps,
internal clock
External
reference
230
Internal
380
f
SAMPLE
= 10ksps,
internal clock
External
reference
60
Internal
330
Supply Current
I
DD
MAX1362
f
SAMPLE
= 1ksps,
internal clock
External
reference
6
µA
Internal reference on
330
Shutdown Current
Internal reference off
0.5
10
µA
Power-Supply Rejection Ratio
PSRR
Full-scale input (Note 11)
±0.01
±0.5
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
MAX1361/MAX1362
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Hold Time for START (S)
Condition
t
HD, STA
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)
t
SU, STA
0.6
µs
Data Hold Time
t
HD, DAT
0
900
ns
Data Setup Time
t
SU, DAT
100
ns
Rise Time of Both SDA and SCL
Signals, Receiving
t
R
Measured from 0.3V
DD
to 0.7V
DD
0
300
ns
Fall Time of SDA Transmitting
t
F
Measured from 0.3V
DD
to 0.7V
DD
0
300
ns
Setup Time for STOP (P)
Condition
t
SU, STO
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 (C
B
= 400pF, Figures 1a, 2) (Note 12)
Serial Clock Frequency
f
SCLH
(Note 13)
1.7
MHz
Hold Time, Repeated START
Condition (Sr)
t
HD, STA
160
ns
Low Period of the SCL Clock
t
LOW
(Note 13)
320
ns
High Period of the SCL Clock
t
HIGH
120
ns
Setup Time for a Repeated
START Condition (Sr)
t
SU, STA
160
ns
Data Hold Time
t
HD, DAT
(Note 14)
0
150
ns
Data Setup Time
t
SU, DAT
10
ns
Rise Time of SCL Signal
t
RCL
Measured from 0.3V
DD
to 0.7V
DD
20
80
ns
Rise Time of SCL Signal After
Acknowledge Bit
t
RCL1
Measured from 0.3V
DD
to 0.7V
DD
20
160
ns
Fall Time of SCL Signal
t
FCL
Measured from 0.3V
DD
to 0.7V
DD
20
80
ns
Rise Time of SDA Signal
t
RDA
Measured from 0.3V
DD
to 0.7V
DD
20
160
ns
Fall Time of SDA Signal
t
FDA
Measured from 0.3V
DD
to 0.7V
DD
20
160
ns
Setup Time for STOP (P)
Condition
t
SU, STO
160
ns
Capacitive Load for Each Bus
C
B
400
pF
Pulse Width of Spike Suppressed
0
10
ns
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