19-3710; Rev 2; 8/10
16-Bit, Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
General Description
The MAX1359B smart data-acquisition systems (DAS) is
based on a 16-bit, sigma-delta analog-to-digital converter
(ADC) and system-support functionality for a micro-
processor (µP)-based system. This device integrates
an ADC, DAC, two operational amplifiers, internal
1.25V/2.048V/2.5V selectable reference, temperature
sensors, analog switches, a 32kHz oscillator, a real-
time clock (RTC) with alarm, a high-frequency-locked
loop (FLL) clock, four user-programmable I/Os, an
interrupt generator, and 1.8V and 2.7V voltage monitors
in a single chip.
The MAX1359B has dual 10:1 differential input multi-
plexers (muxes) that accept signal levels from 0 to
AV
DD
. An on-chip 1x to 8x programmable-gain amplifi-
er (PGA) measures low-level signals and reduces exter-
nal circuitry required.
The MAX1359B operates from a single +1.8V to +3.6V
supply and consumes only 1.4mA in normal mode and
only 6.1µA in sleep mode.
The serial interface is compatible with either SPI™/QSPI™
or MICROWIRE™, and is used to power up, configure,
and check the status of all functional blocks.
The MAX1359B is available in a space-saving 40-pin
TQFN package and is specified over the commercial
(0°C to +70°C) and the extended (-40°C to +85°C) tem-
perature ranges.
Features
o
+1.8V to +3.6V Single-Supply Operation
o
Multichannel 16-Bit Sigma-Delta ADC
10sps to 512sps Programmable Conversion Rate
Self and System Offset and Gain Calibration
PGA with Gains of 1, 2, 4, or 8
Unipolar and Bipolar Modes
10-Input Differential Multiplexer
o
10-Bit Force-Sense DAC
o
Uncommitted Op Amps
o
Dual SPDT Analog Switches
o
1.25V, 2.048V, or 2.5V Selectable Voltage
Reference
o
Internal Charge Pump
o
System Support
Real Time Clock and Alarm Register
Internal/External Temperature Sensor
Internal Oscillator with Clock Output
User-Programmable I/O and Interrupt Generator
V
DD
Monitors
o
SPI/QSPI/MICROWIRE, 4-Wire Serial Interface
o
Space-Saving (6mm x 6mm x 0.8mm) 40-Pin TQFN
Package
MAX1359B
Ordering Information
PART
MAX1359BETL+
MAX1359BCTL+
TEMP RANGE
-40°C to +85°C
0°C to +70°C
PIN-PACKAGE
40 TQFN-EP**
40 TQFN-EP**
Applications
Battery-Powered and Portable Devices
Electrochemical and Optical Sensors
Medical Instruments
**
EP = Exposed pad.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
AGND
OUTA
OUT2
AV
DD
SWA
IN2+
IN1+
IN2-
30 29 28 27 26 25 24 23 22 21
IN1-
20
OUT1
19
SNC2
18
SCM2
17
SNO2
16
SNC1
15
SCM1
14
SNO1
13
32KIN
12
32KOUT
11
RESET
1
CLK
2
UPIO2
3
UPIO3
4
UPIO4
5
DOUT
6
SCLK
7
DIN
8
CS
9
INT
10
CLK32K
FBA
Industrial Control
Data-Acquisition Systems
AIN2
AIN1
REF
REG
CF-
CF+
CPOUT
DV
DD
DGND
UPIO1
31
32
33
34
35
36
37
38
39
40
MAX1359B
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
TQFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
16-Bit, Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
MAX1359B
ABSOLUTE MAXIMUM RATINGS
AV
DD
to AGND .........................................................-0.3V to +4V
DV
DD
to DGND.........................................................-0.3V to +4V
AV
DD
to DV
DD
............................................................-4V to +4V
AGND to DGND.....................................................-0.3V to +0.3V
CLK32K to DGND ....................................-0.3V to (DV
DD
+ 0.3V)
UPIO_ to DGND........................................................-0.3V to +4V
Digital Inputs to DGND ............................................-0.3V to +4V
Analog Inputs to AGND ...........................-0.3V to (AV
DD
+ 0.3V)
Digital Output to DGND…........................-0.3V to (DV
DD
+ 0.3V)
Analog Outputs to AGND.........................-0.3V to (AV
DD
+ 0.3V)
CPOUT........................................................(DV
DD
- 0.3V) to +4V
Continuous Current Into Any Pin.........................................50mA
Continuous Power Dissipation (T
A
= +70°C)
40-Pin TQFN (derate 25.6mW/°C above +70°C) ....2051.3mW
Operating Temperature Range
MAX1359BETL.................................................-40°C to +85°C
MAX1359BCTL ...................................................0°C to +70°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+260°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
(AV
DD
= DV
DD
= +1.8V to +3.6V, V
REF
= +1.25V, external reference, f
CLK32K
= 32.768kHz (external clock), C
REG
= 10µF, C
CPOUT
=
10µF, 10µF between CF+ and CF-, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
ADC DC ACCURACY
Noise-Free Resolution
Conversion Rate
Output Noise
Integral Nonlinearity
Unipolar Offset Error or Bipolar
Zero Error (Note 3)
Unipolar Offset-Error or Bipolar
Zero-Error Temperature Drift
(Note 4)
Gain Error (Notes 3, 5)
Gain-Error Temperature
Coefficient
DC Positive Power-Supply
Rejection Ratio
ADC ANALOG INPUTS (AIN1, AIN2)
DC Input Common-Mode
Rejection Ratio
CMRR
PGA gain = 1, unipolar mode
85
dB
PSRR
INL
Data rate = 10sps, PGA gain = 2;
data rate = 10sps to 60sps, PGA gain = 1;
no missing codes, Table 1 (Note 2)
No missing codes, Table 1
No missing codes
Unipolar mode, AV
DD
= 3V,
data rate = 40sps, PGA gain = 1,
T
A
= +25°C
Uncalibrated
Data rate = 10sps, PGA gain = 1, calibrated
Bipolar
Unipolar
Uncalibrated
Data rate = 10sps, PGA = 1, calibrated
(Notes 4, 6)
PGA gain = 1, unipolar mode, measured by
full-scale error with AV
DD
= 1.8V to 3.6V
±2.0
µV/°C
±10
±0.6
±0.003
±1.0
73
% FSR
ppm/
°C
dB
16
10
Table 1
±0.004
±1.0
±0.003
512
Bits
sps
µV
RMS
%FSR
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
%FSR
2
_______________________________________________________________________________________
16-Bit, Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +1.8V to +3.6V, V
REF
= +1.25V, external reference, f
CLK32K
= 32.768kHz (external clock), C
REG
= 10µF, C
CPOUT
=
10µF, 10µF between CF+ and CF-, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Normal-Mode 60Hz Rejection
Ratio
Normal-Mode 50Hz Rejection
Ratio
Absolute Input Range
Unipolar mode
Differential Input Range
Bipolar mode
ADC not in measurement mode, mux
enabled, T
A
≤
+55°C, inputs = +0.1V to
(AV
DD
- 0.1V)
T
A
= +85°C
Input Sampling Capacitance
Input Sampling Rate
External Source Impedance at
Input
Resolution
Differential Nonlinearity
Integral Nonlinearity
Offset Error
Offset-Error Tempco
Gain Error
Gain-Error Tempco
Input Leakage Current at SWA/B
Input Leakage Current at FBA/B
DAC Output Buffer Leakage
Current
Input Common-Mode Voltage
Line Regulation
Load Regulation
Output Voltage Range
Excludes offset and voltage reference error
Excludes offset and reference drift
SWA/B switches open (Notes 7, 8)
V
FBA/B
= +0.3V to
(AV
DD
- 0.3V)
(Note 7)
T
A
= -40°C to +85°C
T
A
= 0°C to +70°C
T
A
= 0°C to +50°C
±1
±1
±1
±600
±400
±75
0
40
AGND
AV
DD
-
0.35
175
0.5
AV
DD
DNL
INL
C
IN
f
SAMPLE
See Table 3
5
21.84
Table 3
-V
REF
/
Gain
V
REF
/
Gain
±1
±5
pF
kHz
kΩ
SYMBOL
CONDITIONS
Data rate = 10sps or 60sps, PGA gain = 1,
unipolar mode (Note 2)
Data rate = 10sps or 50sps, PGA gain = 1,
unipolar mode (Note 2)
MIN
100
100
AGND
-0.05 /
Gain
AV
DD
V
REF
/
Gain
V
TYP
MAX
UNITS
dB
dB
V
MAX1359B
DC Input Current (Note 7)
nA
FORCE-SENSE DAC (R
L
= 10kΩ and C
L
= 200pF, FBA = OUTA, unless otherwise noted)
Guaranteed monotonic
Code 3D hex to 3FF hex
Code 3D hex to 3FF hex
Reference to code 52 hex
±4.4
±5
10
±1
±4
±20
Bits
LSB
LSB
mV
µV/°C
LSB
ppm/°C
nA
nA
pA
nA
V
µV/V
µV/µA
V
DAC buffer disabled (Note 7)
At FBA
AV
DD
= +1.8V to +3.6V
I
OUT
=
±2mA,
C
L
= 1000pF (Note 2)
_______________________________________________________________________________________
3
16-Bit, Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
MAX1359B
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +1.8V to +3.6V, V
REF
= +1.25V, external reference, f
CLK32K
= 32.768kHz (external clock), C
REG
= 10µF, C
CPOUT
=
10µF, 10µF between CF+ and CF-, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Output Slew Rate
Output-Voltage Settling Time
SYMBOL
CONDITIONS
52 hex to 3FF hex code swing rising or
falling, R
L
= 10kΩ, C
L
= 100pF
10% to 90% rising or falling to
±0.5
LSB
Referred to FBA excludes
reference noise
OUTA/B shorted to AGND
OUTA/B shorted to AV
DD
Between SWA and OUTA, HFCK enabled
HFCK enabled
Excluding reference
AGND
DAC on, internal REF and ADC off
Internal REF, DAC, and ADC off (Note 7)
AV
DD
≥
+1.8V, T
A
= +25°C
Reference Output Voltage
Output-Voltage Temperature
Coefficient
Output Short-Circuit Current
Line Regulation
V
REF
AV
DD
≥
+2.2V, T
A
= +25°C
AV
DD
≥
+2.7V, T
A
= +25°C
TC
I
RSC
(Note 7)
REF shorted to AGND
REF shorted to AV
DD
T
A
= +25°C
I
SOURCE
= 0
to 500µA
Load Regulation
T
A
= +25°C, V
REF
= 1.25V
I
SINK
= 0 to
50µA
1.7
1.213
1.987
2.425
1.25
2.048
2.5
15
18
90
25
1.2
µV/µA
2.5
100
1.288
2.109
2.575
ppm/
o
C
mA
µA
µV/V
V
100
18
AV
DD
f = 0.1Hz to
10Hz
f = 10Hz to
10kHz
MIN
TYP
40
65
80
µV
P-P
200
20
15
150
mA
Ω
ns
µs
V
MΩ
nA
MAX
UNITS
V/ms
µs
Input Voltage Noise
Output Short-Circuit Current
Input-Output SWA Switch
Resistance
SWA Switch Turn-On/Off Time
Power-On Time
EXTERNAL REFERENCE (REF)
Input Voltage Range
Input Resistance
DC Input Leakage Current
INTERNAL VOLTAGE REFERENCE (C
REF
= 4.7µF)
4
_______________________________________________________________________________________
16-Bit, Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
MAX1359B
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +1.8V to +3.6V, V
REF
= +1.25V, external reference, f
CLK32K
= 32.768kHz (external clock), C
REG
= 10µF, C
CPOUT
=
10µF, 10µF between CF+ and CF-, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Long-Term Stability
Output Noise Voltage
Turn-On Settling Time
TEMPERATURE SENSOR
Temperature Measurement
Resolution
Internal Temperature-Sensor
Measurement Error
ADC resolution is 16-bit, 10sps
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
T
A
= +32°C to +43°C
External Temperature-Sensor
Measurement Error (Note 10)
Temperature Measurement Noise
Temperature Measurement
Power-Supply Rejection Ratio
OP AMP (R
L
= 10kΩ connected to AV
DD
/ 2)
Input Offset Voltage
Offset-Error Tempco
T
A
= -40°C to +85°C
IN1+, IN2+
Input Bias Current (Note 7)
I
BIAS
IN1-, IN2-
Input Offset Current
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
I
OS
CMVR
CMRR
0
≤
V
CM
≤
75mV
75mV < V
CM
≤
AV
DD
- 0.35V
60
T
A
= 0°C to +70°C
T
A
= 0°C to +50°C
T
A
= -40°C to +85°C
T
A
= 0°C to +70°C
T
A
= 0°C to +50°C
V
IN1_
,
IN2_
= +0.3V to (AV
DD
- 0.3V) (Note 7)
0
60
75
V
OS
V
CM
= 0.5V
3
0.006
4
2
0.025
20
±1
±300
±200
±1
±600
±400
±1
AV
DD
-
0.35
±15
mV
µV/
o
C
nA
pA
nA
pA
nA
V
dB
T
A
= +10°C to +50°C
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
0.11
±0.5
±1
±0.50
±0.5
±0.5
±1
0.18
0.2
°C
RMS
°C/V
°C
°C/LSB
°C
SYMBOL
(Note 9)
f = 0.1Hz to 10Hz, AV
DD
= 3V
f = 10Hz to 10kHz, AV
DD
= 3V
Buffer only, settle to 0.1% of final value
CONDITIONS
MIN
TYP
35
50
400
100
MAX
UNITS
ppm/
1000hrs
µV
P-P
µs
_______________________________________________________________________________________
5
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