19-5159; Rev 1; 12/10
16-Bit, Data-Acquisition System with ADC, DACs,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
General Description
The MAX1358B smart data-acquisition system (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, DACs, operational amplifiers, internal selec-
table-voltage 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 MAX1358B has dual 10:1 differential input multiplex-
ers (muxes) that accept signal levels from 0 to AV
DD
. An
on-chip 1x to 8x programmable-gain amplifier (PGA)
allows measuring low-level signals and reduces external
circuitry required.
The MAX1358B operates from a single +1.8V to +3.6V
supply and consumes only 1.15mA in normal mode and
only 3µA in sleep mode. The MAX1358B has two DACs
with one uncommitted op amp.
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 MAX1358B 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 477sps 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 DACs
o
Uncommitted Op Amps
o
Dual SPDT and SPST Analog Switches
o
Selectable References
1.25V, 2.048V, and 2.5V
o
Internal Charge Pump
o
System Support
RTC 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
MAX1358B
Ordering Information
PART
MAX1358BCTL+
MAX1358BETL+
TEMP RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
40 TQFN-EP*
40 TQFN-EP*
Applications
Battery-Powered and Portable Devices
Electrochemical and Optical Sensors
Medical Instruments
Industrial Control
Data-Acquisition Systems
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
AGND
OUTB
OUTA
AV
DD
SWB
SWA
IN1+
30 29 28 27 26 25 24 23 22 21
IN1-
FBB
FBA
TOP VIEW
AIN2
AIN1
REF
REG
CF-
CF+
CPOUT
DV
DD
DGND
UPIO1
31
32
33
34
35
36
37
38
39
40
20
19
18
17
16
OUT1
SNC2
SCM2
SNO2
SNC1
SCM1
SNO1
32KIN
32KOUT
RESET
MAX1358B
15
14
13
12
+
1
CLK
2
UPIO2
3
UPIO3
4
UPIO4
5
DOUT
6
SCLK
7
DIN
8
CS
9
INT
*EP
10
CLK32K
11
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
*EXPOSED PAD.
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, DACs,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
MAX1358B
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
MAX1358BCTL+ .................................................0°C to +70°C
MAX1358BETL+ ..............................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (reflow) .......................................+260°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
(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 (Note 3) or
Bipolar Zero Error (Note 2, 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
SYMBOL
CONDITIONS
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,
PGA gain = 1, data rate = 40sps
Uncalibrated
PGA gain = 1, calibrated,
T
A
= +25°C, data rate = 10sps
Bipolar
Unipolar
Uncalibrated
PGA = 1, calibrated, data rate = 10sps
(Notes 4, 6)
PGA gain = 1, unipolar mode, measured by
full-scale error with AV
DD
= 1.8V to 3.6V
1
µV/°C
1
±0.6
±0.003
2
85
%FSR
ppm/
°C
dB
MIN
TYP
MAX
UNITS
16
10
Table 1
±0.0046
±1.0
±0.003
477
Bits
sps
%FSR
%FSR
2
_______________________________________________________________________________________
16-Bit, Data-Acquisition System with ADC, DACs,
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
FORCE-SENSE DAC (R
L
= 10kΩ and C
L
= 200pF, FBA = OUTA, unless otherwise noted)
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
Switches open (Notes 7, 8)
V
FBA
= +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
5.6
±1
±1
±600
±400
±75
0
40
V
AGND
AV
DD
-
0.35
175
0.5
AV
DD
DNL
INL
Guaranteed monotonic
Code 3D hex to 3FF hex
Code 3D hex to 3FF hex
Reference to code 52 hex
5
±5
10
±1
±4
±20
Bits
LSB
LSB
mV
µV/°C
LSB
ppm/°C
nA
nA
pA
nA
V
µV/V
µV/µA
V
C
IN
f
SAMPLE
5
21.94
Table 3
-V
REF
/
Gain
V
REF
/
Gain
±1
±5
pF
kHz
SYMBOL
CONDITIONS
PGA gain = 1, unipolar mode, data rate =
40sps (Note 2)
Data rate = 10sps or 40sps, PGA gain = 1,
unipolar mode (Note 2)
MIN
100
100
V
AGND
-0.05/
Gain
AV
DD
V
REF
/
Gain
V
TYP
MAX
UNITS
dB
dB
V
MAX1358B
DC Input Current (Note 7)
nA
DAC buffer disabled (Note 7)
At FBA
AV
DD
= +1.8V to +3.6V, T
A
= +25°C
I
OUT
=
±2mA,
C
L
= 1000pF (Note 2)
_______________________________________________________________________________________
3
16-Bit, Data-Acquisition System with ADC, DACs,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
MAX1358B
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 shorted to AGND
OUTA shorted to AV
DD
Between SW_ and OUT_, HFCLK enabled
(Note 2)
HFCLK enabled
Excluding reference
V
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
V
REF
AV
DD
≥
+2.2V,
T
A
= +25°C
AV
DD
≥
+2.7V,
T
A
= +25°C
Output-Voltage Temperature
Coefficient (Note 7)
Output Short-Circuit Current
Line Regulation
Load Regulation
T
A
= +25°C,
V
REF
= 1.25V
I
SOURCE
= 0 to 500µA
I
SINK
= 0 to 50µA
1.7
TC
T
A
= -40°C to +85°C
T
A
= 0°C to +70°C
I
RSC
REF shorted to AGND
REF shorted to AV
DD
2.5
100
100
12
AV
DD
f = 0.1Hz to
10Hz
f = 10Hz to
10kHz
MIN
TYP
50
65
40
µV
P-P
100
20
18
150
mA
Ω
ns
µs
V
MΩ
nA
MAX
UNITS
V/ms
µs
Input-Voltage Noise
Output Short-Circuit Current
Input-Output SWA/SWB
Switch Resistance
SWA/SWB 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)
1.213
1.987
2.425
1.25
2.048
2.5
25
13
65
90
25
1.2
mA
µA
µV/V
µV/µA
1.288
2.109
2.575
V
ppm/
o
C
4
_______________________________________________________________________________________
16-Bit, Data-Acquisition System with ADC, DACs,
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
Long-Term Stability
Output Noise Voltage
Turn-On Settling Time
TEMPERATURE SENSOR
Temperature Measurement
Resolution
10sps
T
A
= 0°C to +50°C
T
A
= -40 C to +85°C
o
MAX1358B
SYMBOL
(Note 9)
CONDITIONS
MIN
TYP
150
50
200
100
MAX
UNITS
ppm/
1000hrs
µV
P-P
µs
f = 0.1Hz to 10Hz, AV
DD
= 3V
f = 10Hz to 10kHz, AV
DD
= 3V
Buffer only, settle to 0.1% of final value
0.11
±0.5
°C/LSB
Internal Temperature-Sensor
Measurement Error (Note 10)
External voltage
reference, two-
current method
T
A
= +25°C
T
A
= 0°C to +50°C
T
A
= -40°C to +85°C
°C
±1
±0.5
±0.5
±1.0
0.18
0.2
°C
RMS
°C/V
°C
External Temperature-Sensor
Measurement Error (Note 11)
Temperature Measurement Noise
Temperature Measurement
Power-Supply Rejection Ratio
OP AMP
Input Offset Voltage
Offset-Error Tempco
V
OS
V
CM
= 0.5V
T
A
= -40°C to +85°C
IN1+
T
A
= 0°C to +70°C
T
A
= 0°C to +50°C
T
A
= -40°C to +85°C
IN1-
T
A
= 0°C to +70°C
T
A
= 0°C to +50°C
±1
6.2
0.006
4
2
0.025
20
±15
±1
±300
±200
±1
±600
±400
±1
AV
DD
-
0.35
mV
µV/
o
C
nA
pA
nA
pA
nA
V
Input Bias Current (Note 7)
I
BIAS
Input Offset Current
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
I
OS
CMVR
V
IN1_
= +0.3V to (AV
DD
- 0.3V) (Note 7)
0
0
≤
V
CM
≤
75mV
60
60
75
75
CMRR
75mV < V
CM
≤
AV
DD
- 0.5V, T
A
= +25°C
AV
DD
- 0.5V
≤
V
CM
≤
AV
DD
- 0.35V
dB
_______________________________________________________________________________________
5
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