General Description
The MAX1463 is a highly integrated, low-power, two-
channel sensor signal processor optimized for industri-
al and process control applications such as pressure
sensing and compensation, RTD and thermal-couple
linearization, weight sensing and classification, and
remote process monitoring with limit indication.
The MAX1463 accommodates sensors with outputs
ranging from 1mV/V to 1V/V and supports both pro-
grammable current and voltage sensor excitation. The
MAX1463 provides amplification, calibration, signal lin-
earization, and temperature compensation that enable
an overall performance approaching the inherent
repeatability of the sensor without requiring any exter-
nal trim components.
Two 16-bit voltage output DACs and two 12-bit PWMs
can be used to indicate each of the temperature-com-
pensated sensor signals independently, as a sum or
difference signal, or user-defined relationship between
each signal and temperature. Uncommitted op amps
are available for buffering the DAC outputs, driving
heavier external loads, or providing additional gain and
filtering.
The MAX1463 incorporates a 16-bit CPU, user-pro-
grammable 4kB of FLASH program memory, 128 bytes
of FLASH user information, one 16-bit ADC, two 16-bit
DACs, two 12-bit PWM digital outputs, four Rail-to-Rail
op amps, one SPITM-compatible interface, two GPIOs,
and one on-chip temperature sensor.
The MAX1463 operates from a single 5.0V supply and
is packaged for automotive, industrial, and commercial
temperature ranges in a 28-pin SSOP package.
Applications
Pressure Sensor Signal Conditioning
Weight Measurement Systems
Thermocouple and RTD Linearization
Transducers and Transmitters
Process Indicators
Calibrators and Controllers
GMR and MR Magnetic Direction Sensors
Features
o Programmable Amplification, Calibration,
Linearization, and Temperature Compensation
o Two Differential or Four Single-Ended Sensor
Input Channels
o Accommodates Sensor Output Sensitivities from
1mV/V to 1V/V
o Two DAC/PWM Output Signal Channels
o 420mA Output Capability
o 4kB of FLASH Memory for Code and Coefficients
o 128 Bytes of FLASH Memory for User Information
o Integrated Temperature Sensor
o Flexible Dual Op-Amp Blocks
o Programmable Sensor Input Gain and Offset
o Programmable Sensor Sampling Rate and
Resolution
o Programmable Current Excitation Source for
Bridge Sensors
o Buffered 1.25V Output Reference
o No External Trim Components Required
MAX1463
Low-Power Two-Channel Sensor
Signal Processor
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2549; Rev 0; 8/02
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.
*Dice are tested at T
A
= +25C, DC parameters only.
Functional Diagram and Detailed Block Diagram appear at
end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
SPI is a trademark of Motorola, Inc.
PART
TEMP RANGE
PIN-PACKAGE
MAX1463CAI
0C to +70C
28 SSOP
MAX1463C/W*
0C to +70C
Die
MAX1463EAI
-40C to +85C
28 SSOP
MAX1463AAI
-40C to +125C
28 SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
OUT2SM
AMP2M
AMP2P
OUT2LG
ISRC
INP1
V
DDF
INM1
INP2
INM2
VREF
V
SS
GPIO2
GPIO1
V
SS
SCLK
DI
DO
CS
CKIO
CKSEL
N.C.
V
DD
VBG
OUT1LG
AMP1P
AMP1M
OUT1SM
SSOP
TOP VIEW
MAX1463
Pin Configuration
MAX1463
Low-Power Two-Channel Sensor
Signal Processor
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 5.0V, V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25C, unless otherwise noted.) (Note 1)
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
- V
SS
...............................................................-0.3V to +6.0V
All Other Pins to V
SS
...................................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70C)
28-Pin SSOP (derate 9.5mW/C above +70C) ..........762mW
Operating Temperature Ranges (T
MIN
to T
MAX
)
MAX1463CAI .....................................................0C to +70C
MAX1463EAI...................................................-40C to +85C
MAX1463AAI ................................................-40C to +125C
MAX1463C/W.....................................................0C to +70C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) ................................ +300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY
Supply Voltage
V
DD
V
SS
= 0V
4.5
5.0
5.5
V
Base Operating Current
I
BO
CPU stopped (Note 2)
640
715
785
A
CPU Current
I
CPU
All modules off, CPU = on, additive to I
BO
(Note 3)
650
820
995
A
All modules off, ADC = on, ADC clk =
1MHz, additive to I
BO
; the CPU and ADC
are not on at the same time (Note 3)
840
1035
1150
ADC Current
I
ADC
All modules off, ADC = on, ADC clk = 7kHz,
additive to I
BO
; the CPU and ADC are not
on at the same time (Note 3)
510
720
850
A
DAC Current
I
DACn
All modules off, DAC = on, additive to I
BO,
(n = 1 or 2) (Note 4)
400
470
520
A
Large Op-Amp Current
I
OPLGn
All modules off, CPU stopped, large op
amp = on (n = 1 or 2)
350
585
700
A
Small Op-Amp Current
I
OPSMn
All modules off, CPU stopped, small op
amp = on (n = 1 or 2)
130
175
210
A
ANALOG INPUT
PGA[4:0] = 00000, CLK[2:0] = 000
4
M
PGA[4:0] = 01010
,
CLK[2:0] = 000
100
PGA[4:0] = 11110, CLK[2:0] = 000
62.5
k
PGA[4:0] = 00000, CLK[2:0] = 011
32
M
PGA[4:0] = 01010, CLK[2:0] = 011
800
PGA[4:0] = 11110, CLK[2:0] = 011
500
k
PGA[4:0] = 00000, CLK[2:0] = 110
256
PGA[4:0] = 01010, CLK[2:0] = 110
6.4
Differential Input Impedance
(INP1 to INM1 and
INP2 to INM2)
R
DIN
PGA[4:0] = 01000, CLK[2:0] = 110
4
M
MAX1463
Low-Power Two-Channel Sensor
Signal Processor
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PGA[4:0] = 00000, CLK[2:0] = 000
2
M
PGA[4:0] = 01010
,
CLK[2:0] = 000
50
PGA[4:0] = 11110, CLK[2:0] = 000
31.2
k
PGA[4:0] = 00000, CLK[2:0] = 011
16
M
PGA[4:0] = 01010, CLK[2:0] = 011
400
PGA[4:0] = 11110, CLK[2:0] = 011
250
k
PGA[4:0] = 00000, CLK[2:0] = 110
128
PGA[4:0] = 01010, CLK[2:0] = 110
3.2
Single-Sided Input Impedance
(INP1 to V
SS
, INM1 to V
SS
,
INP2 to V
SS
, INP2 to V
SS
)
R
SIN
PGA[4:0] = 01000, CLK[2:0] = 110
2
M
Common-Mode Rejection Ratio
CMRR
Common-mode voltage V
CM
= V
SS
to V
DD
90
dB
Differential Signal-Gain Range
Selectable in 17 steps (Note 5)
0.94240
PGA[4:0] = 00000
0.90
0.94
1.0
PGA[4:0] = 00001
7.0
7.4
8.0
PGA[4:0] = 01010
68
73
78
PGA[4:0] = 10100
125
133
143
Differential Signal Gain
A
VDIFF
PGA[4:0] = 11110
220
240
260
V/V
Gain-Error Temperature
Coefficient
GETC
ADC
PGA[4:0] = 00000
-8
ppm/
C
COARSE-OFFSET DAC
Resolution
3-bit plus sign
4
Bits
PGA[4:0] =
00000 to 01000
130
135
140
PGA[4:0] =
01010 to 10000
256
266
276
COREF = V
DD
,
CO[3:0] = 0111
PGA[4:0] =
10100 to 11110
450
481
510
PGA[4:0] =
00000 to 01000
55
60
65
PGA[4:0] =
01010 to 10000
107
117
127
COREF = V
DD
,
CO[3:0] = 0011
PGA[4:0] =
10100 to 11110
180
210
240
PGA[4:0] =
00000 to 01000
0
5
10
PGA[4:0] =
01010 to 10000
3
9
15
Effective Offset Adjustment at the
ADC Input
OA
ADC
COREF = V
DD
,
CO[3:0] = 0000
PGA[4:0] =
10100 to 11110
-4
+8
+20
% of
ADC
Ref
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5.0V, V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25C, unless otherwise noted.) (Note 1)
MAX1463
Low-Power Two-Channel Sensor
Signal Processor
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PGA[4:0] =
00000 to 01000
8
12
16
PGA[4:0] =
01010 to 10000
17
23
30
COREF = V
DD
,
CO[3:0] = 1000
PGA[4:0] =
10100 to 11110
23
33
43
PGA[4:0] =
00000 to 01000
-50
-44
-40
PGA[4:0] =
01010 to 10000
-94
-87
-80
COREF = V
DD
,
CO[3:0] = 1011
PGA[4:0] =
10100 to 11110
-185
-169
-155
PGA[4:0] =
00000 to 01000
-124
-117
-110
PGA[4:0] =
01010 to 10000
-250
-238
-225
Effective Offset Adjustment at the
ADC Input
OA
ADC
COREF = V
DD
,
CO[3:0] = 1111
PGA[4:0] =
10100 to 11110
-475
-445
-415
% of
ADC
Ref
SMALL OP AMP
Input Offset Voltage
V
OS
_
SM
0
7
mV
Input Bias Current
I
B
_
SM
1
nA
DC Gain
A
VOL
_
SM
OUTnSM = 0.5V to 4.5V (n = 1 or 2),
R
LOAD
=
100
dB
Gain Bandwidth Product
GBW_
SM
A
VOL_SM
= +1V/V
2.7
MHz
Slew Rate
SR_
SM
A
VOL_SM
= +1V/V
2.2
V/s
Common-Mode Input Range
CMR_
SM
V
SS
V
DD
V
Common-Mode Rejection Ratio
CMRR_
SM
V
CM_OPAMP
= V
SS
to V
DD
70
dB
Power-Supply Rejection Ratio
PSRR_
SM
At DC
70
dB
0.1Hz to 1kHz
8.5
Input-Referred Noise Voltage
V
N
_
SM
0.1Hz to 1MHz
100
V
RMS
R
LOAD
=
4.9
Output High Voltage
V
OH
_
SM
R
LOAD
= 4.7k
to V
SS
4.85
V
R
LOAD
=
0.1
Output Low Voltage
V
OL
_
SM
R
LOAD
= 4.7k
to V
DD
0.15
V
Output Source Current
I
SRC
_
SM
V
OUTnSM
= V
OH_SM
, R
LOAD
= 4.7k
to V
SS
-1.04
mA
Output Sink Current
I
SNK
_
SM
V
OUTnSM
= V
OL_SM
, R
LOAD
= 4.7k
to V
DD
1.04
mA
Maximum Output Load
Capacitance
C
L
_
SM
R
LOAD
=
, phase margin > 55
120
pF
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5.0V, V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25C, unless otherwise noted.) (Note 1)
MAX1463
Low-Power Two-Channel Sensor
Signal Processor
_______________________________________________________________________________________
5
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LARGE OP AMP
Input Offset Voltage
V
OS
_
LG
0
4
mV
Input Bias Current
I
B
_
LG
225
nA
DC Gain
A
VOL
_
LG
OUTnLG = 0.5V to 4.5V (n = 1 or 2),
R
LOAD
=
100
dB
Gain Bandwidth Product
GBW_
LG
A
VOL_LG
= +1V/V
4.0
MHz
Slew Rate
SR_
LG
A
VOL_LG
= +1V/V
3.2
V/s
Common-Mode Input Range
CMR_
LG
V
SS
V
DD
V
Common-Mode Rejection Ratio
CMRR_
LG
V
CM OPAMP
= V
SS
to V
DD
70
dB
Power-Supply Rejection Ratio
PSRR_
LG
At DC
70
dB
0.1Hz to 1kHz
19
Input-Referred Noise Voltage
V
N
_
LG
0.1Hz to 1MHz
160
V
RMS
R
LOAD
=
4.95
Output High Voltage
V
OH
_
LG
R
LOAD
= 1k
to V
SS
4.90
V
R
LOAD
=
0.03
Output Low Voltage
V
OL
_
LG
R
LOAD
= 1k
to V
DD
0.12
V
Output Source Current
I
SRC
_
LG
V
OUTnLG
= V
OH_LG
, R
LOAD
= 1k
to V
SS
-4.9
mA
Output Sink Current
I
SNK
_
LG
V
OUTnLG
= V
OL_LG
, R
LOAD
= 1k
to V
DD
4.9
mA
Maximum Output Load
Capacitance
C
L
_
LG
R
LOAD
=
, phase margin > 55
200
pF
OP-AMP SWITCH
Analog Signal Range
V
SW
V
SS
V
DD
V
On-Resistance
R
ON
5
k
Off-Isolation
V
ISO
80
dB
DIGITAL-TO-ANALOG CONVERTER
Resolution
RES
DAC
16
Bits
Integral Nonlinearity
INL
DAC
3
Bits
Differential Nonlinearity
DNL
DAC
1
Bits
Offset Error
V
DAC OS
DAC ref = V
DD
, DAC data = 0000h
V
DD
/ 2
- 0.05
V
DD
/ 2
+ 0.05
V
Bit Weight
BW
DAC
DAC ref = 5VDC
91.55
V/LSB
Power-Supply Rejection Ratio
PSRR
DAC
At DC, DAC ref = V
REF
60
dB
Output Noise
ON
DAC
DAC buffer is the small op amp
3
LSB
Output Settling Time
ST
DAC
To 0.1% of final value
250
s
PULSE-WIDTH MODULATOR
Resolution
RES
PWM
(Note 6)
12
Bits
Period
P
PWM
f
CLK
= 4.0 MHz
8.192
ms
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5.0V, V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25C, unless otherwise noted.) (Note 1)
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