19-5238; Rev 0; 4/10
16-Bit, Single-Channel, Ultra-Low Power,
Delta-Sigma ADC with 2-Wire Serial Interface
General Description
The MAX11205 is an ultra-low-power (< 300FA max
active current), high-resolution, serial-output ADC. This
device provides the highest resolution per unit power
in the industry, and is optimized for applications that
require very high dynamic range with low power such as
sensors on a 4mA to 20mA industrial control loop. The
MAX11205 provides a high-accuracy internal oscillator
that requires no external components.
When used with the specified data rates, the internal
digital filter provides more than 80dB rejection of 50Hz or
60Hz line noise. The MAX11205 provides a simple 2-wire
serial interface in the space-saving, 10-pin
FMAX
M
pack-
age. The MAX11205 operates over the -40NC to +85NC
temperature range.
S
S
S
S
S
Features
16-Bit Full-Scale Resolution
720nV
RMS
Noise (MAX11205B)
3ppm INL
No Missing Codes
Ultra-Low-Power Dissipation
Operating-Mode Current Drain < 300µA (max)
Sleep-Mode Current Drain < 0.1µA
2.7V to 3.6V Analog Supply Voltage Range
1.7V to 3.6V Digital and I/O Supply Voltage Range
Fully Differential Signal Inputs
Fully Differential Reference Inputs
Internal System Clock
2.4576MHz (MAX11205A)
2.2528MHz (MAX11205B)
External Clock
Serial 2-Wire Interface (Clock Input and Data Input)
On-Demand Offset and Gain Self-Calibration
-40°C to +85°C Operating Temperature Range
±2kV ESD Protection
Lead(Pb)-Free and RoHS-Compliant µMAX
Package
MAX11205
S
S
S
S
S
Applications
Sensor Measurement (Temperature and
Pressure)
Portable Instrumentation
Battery Applications
Weigh Scales
S
S
S
S
S
S
Ordering Information
PART
MAX11205AEUB+*
MAX11205BEUB+
PIN-PACKAGE
10
FMAX
10
FMAX
OUTPUT RATE
(sps)
120
13.75
Note:
All devices are specified over the -40NC to +85NC oper-
ating temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*Future
product—contact factory for availability.
Selector Guide
RESOLUTION
(BITS)
24
20
18
16
4-WIRE SPI, 16-PIN QSOP,
PROGRAMMABLE GAIN
MAX11210
MAX11206
MAX11209
MAX11213
4-WIRE SPI,
16-PIN QSOP
MAX11200
MAX11207
MAX11211
MAX11203
2-WIRE SERIAL,
10-PIN µMAX
MAX11201 (with buffers)
MAX11202 (without buffers)
MAX11208
MAX11212
MAX11205
µMAX is a registered trademark of Maxim Integrated Products, Inc.
_______________________________________________________________
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, Single-Channel, Ultra-Low Power,
Delta-Sigma ADC with 2-Wire Serial Interface
MAX11205
ABSOLUTE MAXIMUM RATINGS
Any Pin to GND ....................................................-0.3V to +3.9V
AVDD to GND.......................................................-0.3V to +3.9V
DVDD to GND ......................................................-0.3V to +3.9V
Analog Inputs (AINP, AINN, REFP, REFN)
to GND.............................................. -0.3V to (V
AVDD
+ 0.3V)
Digital Inputs and Digital Outputs
to GND.............................................. -0.3V to (V
DVDD
+ 0.3V)
ESD
HB
(AVDD, AINP, AINN, REFP, REFN, DVDD, CLK, SCLK,
RDY/DOUT,
GND) ............................................
Q2kV
(Note 1)
Continuous Power Dissipation (T
A
= +70NC)
10-Pin
FMAX
(derate 5.6mW/NC above +70NC) ..........444mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -55NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Note 1:
Human Body Model to specification MIL-STD-883 Method 3015.7.
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
AVDD
= +3.6V, V
DVDD
= +1.8V, V
REFP
- V
REFN
= V
AVDD
; internal clock, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25NC under normal conditions, unless otherwise noted.)
PARAMETER
ADC PERFORMANCE
Noise-Free Resolution
Thermal Noise (Notes 2, 3)
Integral Nonlinearity
Zero Error
Zero Drift
Full-Scale Error
Full-Scale Error Drift
Power-Supply Rejection
ANALOG INPUTS/REFERENCE INPUTS
DC rejection
Common-Mode Rejection (Note 6)
Normal Mode 50Hz Rejection
Normal Mode 60Hz Rejection
Common-Mode Voltage Range
Low input voltage
Absolute Input Voltage
High input voltage
DC Input Leakage
AIN Dynamic Input Current
Sleep mode (Note 2)
CMR
NMR50
NMR60
50Hz/60Hz rejection, MAX11205A
50Hz/60Hz rejection, MAX11205B
MAX11205B (Note 7)
MAX11205B (Note 7)
90
90
144
65
73
GND
GND -
30mV
VAVDD
+ 30mV
±1
5
80.5
87
VAVDD
dB
dB
V
123
dB
AVDD DC rejection
DVDD DC rejection (Note 6)
70
86
After calibration, VREFP - VREFN =2.5V
(Note 5)
-45
NFR
VN
INL
VOFF
(Notes 2, 3)
MAX11205A
MAX11205B
(Note 4)
After calibration, VREFP - VREFN = 2.5V
-20
-20
1
50
3
0.05
80
100
+45
16
2.1
0.72
+20
+20
Bits
FV
RMS
ppmFSR
ppmFSR
nV/NC
ppmFSR
ppmFSR/
NC
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
FA
FA
2
______________________________________________________________________________________
16-Bit, Single-Channel, Ultra-Low Power,
Delta-Sigma ADC with 2-Wire Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= +3.6V, V
DVDD
= +1.8V, V
REFP
- V
REFN
= V
AVDD
; internal clock, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25NC under normal conditions, unless otherwise noted.)
PARAMETER
REF Dynamic Input Current
AIN Input Capacitance
REF Input Capacitance
AIN Voltage Range
REF Voltage Range
Input Sampling Rate
REF Sampling Rate
LOGIC INPUTS (SCLK, CLK)
Input Current
Input Low Voltage
Input High Voltage
Input Hysteresis
External Clock
LOGIC OUTPUTS (RDY/DOUT)
Output Low Level
Output High Level
Floating State Leakage Current
Floating State Output
Capacitance
POWER REQUIREMENTS
Analog Supply Voltage
Digital Supply Voltage
Total Operating Current
DVDD Operating Current
AVDD Operating Current
AVDD Sleep Current
DVDD Sleep Current
2-WIRE SERIAL-INTERFACE TIMING CHARACTERISTICS
SCLK Frequency
SCLK Pulse Width Low
SCLK Pulse Width High
SCLK Rising Edge to Data Valid
Transition Time
fSCLK
t1
t2
t3
60/40 duty cycle 5MHz clock
40/60 duty cycle 5MHz clock
80
80
40
5
MHz
ns
ns
ns
AVDD
DVDD
(AVDD + DVDD)
2.7
1.7
230
45
185
0.4
0.35
3.6
3.6
300
60
245
2
2
V
V
FA
FA
FA
FA
FA
VOL
VOH
IOL = 1mA; also tested for VDVDD = 3.6V
IOH = 1mA; also tested for VDVDD = 3.6V
Output leakage current
0.9 x
VDVDD
Q10
9
0.4
V
V
FA
pF
VIL
VIH
VHYS
MAX11205A
MAX11205B
0.7 x
VDVDD
200
2.4576
2.2528
Input leakage current
±1
0.3 x
VDVDD
FA
V
V
mV
MHz
fS
MAX11205A
MAX11205B
MAX11205A
MAX11205B
246
225
246
225
VAINP - VAINN
-VREF
SYMBOL
CONDITIONS
MIN
TYP
7.5
10
15
+VREF
VAVDD
MAX
UNITS
FA
pF
pF
V
V
kHz
kHz
MAX11205
_______________________________________________________________________________________
3
16-Bit, Single-Channel, Ultra-Low Power,
Delta-Sigma ADC with 2-Wire Serial Interface
MAX11205
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= +3.6V, V
DVDD
= +1.8V, V
REFP
- V
REFN
= V
AVDD
; internal clock, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25NC under normal conditions, unless otherwise noted.)
PARAMETER
SCLK Rising Edge Data Hold
Time
RDY/DOUT
Fall to SCLK Rising
Edge
Next Data Update Time;
No Read Allowed
Data Conversion Time
Data Ready Time After
Calibration Starts (CAL + CNV)
SCLK High After
RDY/DOUT
Goes
Low to Activate Sleep Mode
Time from
RDY/DOUT
Low to
SCLK High for Sleep Mode
Activation
Data Ready Time After Wake-Up
from Sleep Mode
Data Ready Time After
Calibration from Sleep Mode
Wake-Up (CAL + CNV)
Note
Note
Note
Note
Note
Note
2:
3:
4:
5:
6:
7:
SYMBOL
t4
t5
t6
t7
t8
t9
t10
t11
t12
MAX11205A
MAX11205B
MAX11205A
MAX11205B
MAX11205A
MAX11205B
MAX11205A
MAX11205B
MAX11205A
MAX11205B
MAX11205A
MAX11205B
MAX11205A
MAX11205B
0
0
0
0
8.6
73
208.4
256.2
CONDITIONS
Allows for positive edge data read
MIN
3
0
155
169
8.6
73
208.3
256.1
8.6
73
8.6
73
TYP
MAX
UNITS
ns
ns
Fs
ms
ms
ms
ms
ms
ms
These specifications are not fully tested and are guaranteed by design and/or characterization.
V
AINP
= V
AINN
.
ppmFSR is parts per million of full-scale range.
Positive full-scale error includes zero-scale errors.
Tested with V
REF
= 1.8V.
The MAX11205A has no normal-mode rejection at 50Hz or 60Hz.
4
______________________________________________________________________________________
16-Bit, Single-Channel, Ultra-Low Power,
Delta-Sigma ADC with 2-Wire Serial Interface
Typical Operating Characteristics
(V
AVDD
= 3.6V, V
DVDD
= 1.8V, V
REFP
- V
REFN
= V
AVDD
; internal clock; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25NC.)
ANALOG ACTIVE CURRENT
vs. AVDD VOLTAGE (MAX11205A)
MAX11205 toc01
MAX11205
ANALOG ACTIVE CURRENT
vs. AVDD VOLTAGE (MAX11205B)
MAX11205 toc02
ANALOG SLEEP CURRENT vs. AVDD
VOLTAGE (MAX11205A/MAX11205B)
V
DVDD
= 1.8V
0.8
CURRENT (µA)
0.6
0.4
0.2
T
A
= +25°C
0
T
A
= +85°C
T
A
= -45°C
MAX11205 toc03
240
V
DVDD
= 1.8V
220
200
CURRENT (µA)
180
160
140
120
100
2.70
2.85
3.00
3.15
3.30
3.45
T
A
= +85°C
T
A
= +25°C
T
A
= -45°C
240
V
DVDD
= 1.8V
220
200
CURRENT (µA)
180
160
140
120
100
T
A
= +85°C
T
A
= +25°C
T
A
= -45°C
1.0
3.60
2.70
2.85
3.00
3.15
3.30
3.45
3.60
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
AVDD VOLTAGE (V)
AVDD VOLTAGE (V)
AVDD VOLTAGE (V)
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE (MAX11205A)
MAX11205 toc04
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE (MAX11205B)
MAX11205 toc05
SLEEP CURRENT vs. TEMPERATURE
(MAX11205A/MAX11205B)
V
AVDD
= 3.6V
V
DVDD
= 1.8V
MAX11205 toc06
300
250
200
150
100
V
DVDD
= 1.8V
50
0
-45
-25
-5
15
35
55
75
300
250
TOTAL
CURRENT (µA)
200
V
AVDD
= 3.6V
150
100
50
0
V
DVDD
= 1.8V
1.0
0.8
CURRENT (µA)
0.6
0.4
0.2
0
V
DVDD
TOTAL
TOTAL
V
AVDD
= 3.6V
CURRENT (µA)
V
AVDD
95
-45
-25
-5
15
35
55
75
95
-45
-25
-5
15
35
55
75
95
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DIGITAL ACTIVE CURRENT
vs. DVDD VOLTAGE
120
110
CURRENT (µA)
100
90
80
70
60
50
40
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
DVDD VOLTAGE (V)
MAX11205B
MAX11205A
V
AVDD
= 3.6V
T
A
= +85°C, +25°C, -45°C
MAX11205 toc07
DIGITAL SLEEP CURRENT vs. DVDD
VOLTAGE (MAX11205A/MAX11205B)
MAX11205 toc08
INTERNAL OSCILLATOR FREQUENCY
vs. TEMPERATURE
V
DVDD
= 1.8V
V
AVDD
= 3.0V
MAX11205 toc09
130
3.0
V
AVDD
= 3.6V
2.5
2.0
1.5
1.0
T
A
= +85°C
0.5
0
1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5
DVDD VOLTAGE (V)
T
A
= -45°C
T
A
= +25°C
2.6
2.5
FREQUENCY (MHz)
2.4
2.3
2.2
2.1
2.0
-45
-25
-5
15
35
55
75
MAX11205B
MAX11205A
CURRENT (µA)
95
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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