19-3579; Rev 0; 2/05
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
General Description
The MAX1464 is a highly integrated, low-power, low-
noise multichannel sensor signal processor optimized
for industrial, automotive, and process-control applica-
tions such as pressure sensing and compensation,
RTD and thermocouple linearization, weight sensing
and classification, and remote process monitoring with
limit indication.
The MAX1464 accepts sensors with either single-ended
or differential outputs. The MAX1464 accommodates
sensor output sensitivities from 1mV/V to 1V/V. The
MAX1464 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 to buffer the DAC outputs, drive heavier
external loads, or provide additional gain and filtering.
The MAX1464 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 SPI™-compatible interface, two GPIOs,
and one on-chip temperature sensor.
The MAX1464 operates from a single 5.0V (typ) supply
and is packaged for automotive, industrial, and com-
mercial temperature ranges in a 28-pin SSOP package.
Features
♦
Programmable Amplification, Calibration,
Linearization, and Temperature Compensation
♦
Two Differential or Four Single-Ended ADC Input
Channels
♦
Accommodates Sensor Output Sensitivities from
1mV/V to 1V/V
♦
Two DAC/PWM Output Signal Channels
♦
Supports 4–20mA Current Loop Applications
♦
4kB of FLASH Memory for Code and Coefficients
♦
128 Bytes of FLASH Memory for User Information
♦
Integrated Temperature Sensing
♦
Flexible Dual Op-Amp Block
♦
Programmable Sensor Input Gain and Offset
♦
Programmable Sensor Sampling Rate and
Resolution
♦
No External Trim Components Required
MAX1464
Ordering Information
PART
MAX1464CAI
MAX1464C/W*
MAX1464EAI
MAX1464AAI
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
PIN-PACKAGE
28 SSOP
Die
28 SSOP
28 SSOP
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
*Dice
are tested at T
A
= +25°C, DC parameters only.
Pin Configuration
TOP VIEW
OUT1SM 1
AMP1M 2
AMP1P 3
OUT1LG 4
N.C. 5
V
DD
6
N.C. 7
CKSEL 8
CKIO 9
28 OUT2SM
27 AMP2M
26 AMP2P
MAX1464
25 OUT2LG
24 V
REF
23 INP1
22 INM1
21 INP2
20 INM2
19 V
SS
18 V
SSF
17 GPIO2
16 GPIO1
15 V
DDF
Functional Diagram and Detailed Block Diagram appear at
end of data sheet.
SPI is a trademark of Motorola, Inc.
CS 10
DO 11
DI 12
SCLK 13
V
SS
14
SSOP
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
MAX1464
ABSOLUTE MAXIMUM RATINGS
V
DD
to V
SS
.............................................................-0.3V to +6.0V
V
DDF
to V
SS
...........................................................-0.3V to +6.0V
V
SSF
to V
SS
............................................................-0.3V to +0.3V
All Other Pins to V
SS
...................................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 9.1mW/°C above +70°C) ..........727mW
Operating Temperature Ranges
MAX1464CAI .....................................................0°C to +70°C
MAX1464C/W.....................................................0°C to +70°C
MAX1464EAI...................................................-40°C to +85°C
MAX1464AAI ................................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +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
(V
DDF
= V
DD
= 4.5V to 5.5V, V
SSF
= V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at V
DDF
= V
DD
= 5.0V, V
SSF
= V
SS
= 0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SUPPLY
Supply Voltage
FLASH Supply Voltage
Base Operating Current
CPU Current
V
DD
V
DDF
I
BO
I
CPU
V
SS
= V
SSF
= 0V
V
SS
= V
SSF
= 0V
CPU stopped (Note 2)
All modules off, CPU = on, additive to I
BO
,
I
CPU
= I
DD
+ I
DDF
(Note 3)
All modules off, ADC = on, ADC clk =
1MHz, additive to I
BO
; the CPU and ADC
are not on at the same time
ADC Current (Note 3)
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
DAC Current
Large Op-Amp Current
Small Op-Amp Current
POWER-ON RESET
V
DDF
POR Threshold
V
DDF
POR Hysteresis
ANALOG INPUT
PGA[4:0] = 00000, CLK[2:0] = 000
PGA[4:0] = 01010
,
CLK[2:0] = 000
PGA[4:0] = 11111, CLK[2:0] = 000
Differential Input Impedance
(INP1 to INM1 and
INP2 to INM2)
PGA[4:0] = 00000, CLK[2:0] = 011
R
DIN
PGA[4:0] = 01010, CLK[2:0] = 011
PGA[4:0] = 11111, CLK[2:0] = 011
PGA[4:0] = 00000, CLK[2:0] = 110
PGA[4:0] = 01010, CLK[2:0] = 110
PGA[4:0] = 11111, CLK[2:0] = 110
430
55
36
3.4
440
288
27
3.5
2.3
MΩ
MΩ
kΩ
kΩ
V
DD
> V
DDF
3.6
4.0
-0.85
4.3
V
V
I
DACn
I
OPLGn
I
OPSMn
All modules off, DAC = on, additive to I
BO
(n = 1 or 2) (Note 4)
All modules off, CPU stopped, large op
amp = on (n = 1 or 2)
All modules off, CPU stopped, small op
amp = on (n = 1 or 2)
465
765
1060
4.5
4.5
575
540
5.0
5.0
720
840
5.5
5.5
890
1240
V
V
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
690
1040
1394
µA
425
430
110
550
673
190
730
1020
265
µA
µA
µA
2
_______________________________________________________________________________________
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
ELECTRICAL CHARACTERISTICS (continued)
(V
DDF
= V
DD
= 4.5V to 5.5V, V
SSF
= V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at V
DDF
= V
DD
= 5.0V, V
SSF
= V
SS
= 0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
PGA[4:0] = 00000, CLK[2:0] = 000
PGA[4:0] = 01010
,
CLK[2:0] = 000
PGA[4:0] = 11111, CLK[2:0] = 000
Single-Sided Input Impedance
(INP1 to V
SS
, INM1 to V
SS
,
INP2 to V
SS
, INM2 to V
SS
)
PGA[4:0] = 00000, CLK[2:0] = 011
R
SIN
PGA[4:0] = 01010, CLK[2:0] = 011
PGA[4:0] = 11111, CLK[2:0] = 011
PGA[4:0] = 00000, CLK[2:0] = 110
PGA[4:0] = 01010, CLK[2:0] = 110
PGA[4:0] = 11111, CLK[2:0] = 110
Common-Mode Rejection Ratio
Differential Signal-Gain Range
CMRR
Common-mode voltage V
CM
= V
SS
to V
DD
Selectable in 17 steps (Note 5)
PGA[4:0] = 00000
PGA[4:0] = 00001
Differential Signal Gain
A
VDIFF
PGA[4:0] = 01010
PGA[4:0] = 10100
PGA[4:0] = 11110
Gain-Error Temperature
Coefficient
COARSE-OFFSET DAC
Resolution
3-bit plus sign
PGA[4:0] =
00000 to 01000
REF = V
DD
,
CO[3:0] = 0111
PGA[4:0] =
01010 to 10000
PGA[4:0] =
10100 to 11110
PGA[4:0] =
00000 to 01000
Effective Offset Adjustment at the
ADC Input
OA
ADC
REF = V
DD
,
CO[3:0] = 0011
PGA[4:0] =
01010 to 10000
PGA[4:0] =
10100 to 11110
PGA[4:0] =
00000 to 01000
REF = V
DD
,
CO[3:0] = 0000
PGA[4:0] =
01010 to 10000
PGA[4:0] =
10100 to 11110
137
273
525
57
113
228
-3
-7
-11
4
147
291
578
64
126
251
-1
-2.4
-4
157
308
630
69
136
276
+1
+2
+3
% of
ADC
Ref
Bits
GETC
ADC
PGA[4:0] = 00000
0.95
7.3
71
137
203
MIN
TYP
430
55
36
3.4
440
288
27
3.5
2.3
0.008
0.99 to 244
0.99
7.7
77
153
244
-8
1.05
8.2
82
168
283
ppm/°C
V/V
%FS
V/V
MΩ
MΩ
kΩ
kΩ
MAX
UNITS
MAX1464
_______________________________________________________________________________________
3
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
MAX1464
ELECTRICAL CHARACTERISTICS (continued)
(V
DDF
= V
DD
= 4.5V to 5.5V, V
SSF
= V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at V
DDF
= V
DD
= 5.0V, V
SSF
= V
SS
= 0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
PGA[4:0] =
00000 to 01000
REF = V
DD
,
CO[3:0] = 1000
PGA[4:0] =
01010 to 10000
PGA[4:0] =
10100 to 11110
PGA[4:0] =
00000 to 01000
Effective Offset Adjustment at the
ADC Input
OA
ADC
REF = V
DD
,
CO[3:0] = 1011
PGA[4:0] =
01010 to 10000
PGA[4:0] =
10100 to 11110
PGA[4:0] =
00000 to 01000
REF = V
DD
,
CO[3:0] = 1111
PGA[4:0] =
01010 to 10000
PGA[4:0] =
10100 to 11110
SMALL OP AMP
Input Offset Voltage
Input Bias Current
DC Gain
Gain Bandwidth Product
Slew Rate
Common-Mode Input Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Input-Referred Noise Voltage
Output High Voltage
Output Low Voltage
Output Source Current
Output Sink Current
Maximum Output Load
Capacitance
V
OS
_
SM
I
B
_
SM
A
VOL
_
SM
GBW_
SM
SR_
SM
CMR_
SM
CMRR_
SM
PSRR_
SM
V
N
_
SM
V
OH
_
SM
V
OL
_
SM
I
SRC
_
SM
I
SNK
_
SM
C
L
_
SM
V
CM_OPAMP
= V
SS
to V
DD
At DC
0.1Hz to 1kHz
0.1Hz to 1MHz
R
LOAD
=
∞
R
LOAD
= 4.7kΩ to V
SS
R
LOAD
=
∞
R
LOAD
= 4.7kΩ to V
DD
V
OUTnSM
= V
OH_SM
, R
LOAD
= 4.7kΩ to V
SS
V
OUTnSM
= V
OL_SM
, R
LOAD
= 4.7kΩ to V
DD
R
LOAD
=
∞,
phase margin > 55°
120
V
DD
- 0.1
V
DD
- 0.15
0.1
0.15
-1.04
1.04
OUTnSM = 0.5V to 4.5V (n = 1 or 2),
R
LOAD
=
∞
A
VOL_SM
= +1V/V
A
VOL_SM
= +1V/V
V
SS
+ 0.02
70
70
8.5
100
0
±1
100
2.7
2.2
V
DD
- 0.02
±15
mV
nA
dB
MHz
V/µs
V
dB
dB
µV
RMS
V
V
mA
mA
pF
MIN
-15
-29
-56
-79
-155
-317
-162
-327
-675
TYP
-10
-19
-38
-73
-145
-287
-156
-309
-614
MAX
-4
-10
-20
-66
-135
-257
-150
-293
-555
% of
ADC
Ref
UNITS
4
_______________________________________________________________________________________
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
ELECTRICAL CHARACTERISTICS (continued)
(V
DDF
= V
DD
= 4.5V to 5.5V, V
SSF
= V
SS
= 0V, f
CLK
= 4.0MHz, T
A
= T
MIN
to T
MAX
. Typical values are at V
DDF
= V
DD
= 5.0V, V
SSF
= V
SS
= 0V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
LARGE OP AMP
Input Offset Voltage
Input Bias Current
DC Gain
Gain Bandwidth Product
Slew Rate
Common-Mode Input Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Input-Referred Noise Voltage
Output-Voltage High
Output-Voltage Low
Output Source Current
Output Sink Current
Maximum Output Load
Capacitance
OP-AMP SWITCH
Analog Signal Range
On-Resistance
Off-Isolation
DIGITAL-TO-ANALOG CONVERTER
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Bit Weight
Power-Supply Rejection
Output Noise
Output Settling Time
PULSE-WIDTH MODULATOR
Resolution
Period
RES
PWM
P
PWM
(Note 6)
f
CLK
= 4.0MHz
12
8.192
Bits
ms
RES
DAC
INL
DAC
DNL
DAC
V
DAC OS
BW
DAC
PSR
DAC
ON
DAC
ST
DAC
DAC ref = V
DD
, DAC data = 0000h
DAC ref = 5VDC
At DC, DAC ref = V
REF
DAC buffer is the small op amp
To 0.1% of final value
V
DD
/ 2
- 0.06
91.55
0.02
±3
250
16
3
±1
V
DD
/ 2
+ 0.06
Bits
Bits
Bits
V
µV/LSB
%FS
LSB
µs
V
SW
R
ON
V
ISO
V
SS
5
80
V
DD
V
kΩ
dB
V
OS
_
LG
I
B
_
LG
A
VOL
_
LG
GBW_
LG
SR_
LG
CMR_
LG
CMRR_
LG
PSRR_
LG
V
N
_
LG
V
OH
_
LG
V
OL
_
LG
I
SRC
_
LG
I
SNK
_
LG
C
L
_
LG
V
CM OPAMP
= V
SS
to V
DD
At DC
0.1Hz to 1kHz
0.1Hz to 1MHz
R
LOAD
=
∞
R
LOAD
= 1kΩ to V
SS
R
LOAD
=
∞
R
LOAD
= 1kΩ to V
DD
V
OUTnLG
= V
OH_LG
, R
LOAD
= 1kΩ to V
SS
V
OUTnLG
= V
OL_LG
, R
LOAD
= 1kΩ to V
DD
R
LOAD
=
∞,
phase margin > 55°
200
V
DD
- 0.1
V
DD
- 0.125
0.03
0.13
-4.9
4.9
OUTnLG = 0.5V to 4.5V (n = 1 or 2),
R
LOAD
=
∞
A
VOL_LG
= +1V/V
A
VOL_LG
= +1V/V
V
SS
+ 0.02
70
70
19
160
0
±225
100
4.0
3.2
V
DD
- 0.02
±6
mV
nA
dB
MHz
V/µs
V
dB
dB
µV
RMS
V
V
mA
mA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1464
_______________________________________________________________________________________
5
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