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MAX11205

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

pack-

age. The MAX11205 operates over the -40NC to +85NC

temperature range.

Applications

Sensor Measurement (Temperature and

Pressure)

Portable Instrumentation

Battery Applications

Weigh Scales

Features

S 16-Bit Full-Scale Resolution

S 720nV

RMS

Noise (MAX11205B)

S 3ppm INL

S No Missing Codes

S Ultra-Low-Power Dissipation

Operating-Mode Current Drain < 300µA (max)

Sleep-Mode Current Drain < 0.1µA

S 2.7V to 3.6V Analog Supply Voltage Range

S 1.7V to 3.6V Digital and I/O Supply Voltage Range

S Fully Differential Signal Inputs

S Fully Differential Reference Inputs

S Internal System Clock

2.4576MHz (MAX11205A)

2.2528MHz (MAX11205B)

S External Clock

S Serial 2-Wire Interface (Clock Input and Data Input)

S On-Demand Offset and Gain Self-Calibration

S -40°C to +85°C Operating Temperature Range

S ±2kV ESD Protection

S Lead(Pb)-Free and RoHS-Compliant µMAX

Package

19-5238; Rev 0; 4/10

Ordering Information

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.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Selector Guide

PART PIN-PACKAGE

OUTPUT RATE

(sps)

MAX11205AEUB+*

10 FMAX

120

MAX11205BEUB+

10 FMAX

13.75

RESOLUTION

(BITS)

4-WIRE SPI, 16-PIN QSOP,

PROGRAMMABLE GAIN

4-WIRE SPI,

16-PIN QSOP

2-WIRE SERIAL,

10-PIN µMAX

24 MAX11210 MAX11200

MAX11201 (with buffers)

MAX11202 (without buffers)

20 MAX11206 MAX11207 MAX11208

18 MAX11209 MAX11211 MAX11212

16 MAX11213 MAX11203 MAX11205

Summary of content (14 pages)

PAGE 1
9-5238; Rev 0; 4/10 16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface Features 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.
PAGE 2
MAX11205 16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface 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 (VAVDD + 0.
PAGE 3
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface (VAVDD = +3.6V, VDVDD = +1.8V, VREFP - VREFN = VAVDD; internal clock, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC under normal conditions, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS REF Dynamic Input Current 7.
PAGE 4
MAX11205 16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +3.6V, VDVDD = +1.8V, VREFP - VREFN = VAVDD; internal clock, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC under normal conditions, unless otherwise noted.
PAGE 5
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface TA = +85°C TA = +25°C 160 TA = -45°C 220 140 180 TA = +25°C 160 TA = -45°C 2.85 3.00 3.15 3.30 3.45 TA = +25°C 0 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) ACTIVE SUPPLY CURRENT vs. TEMPERATURE (MAX11205A) ACTIVE SUPPLY CURRENT vs. TEMPERATURE (MAX11205B) SLEEP CURRENT vs. TEMPERATURE (MAX11205A/MAX11205B) 250 0.8 VAVDD = 3.
PAGE 6
Typical Operating Characteristics (continued) (VAVDD = 3.6V, VDVDD = 1.8V, VREFP - VREFN = VAVDD; internal clock; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) OFFSET ERROR vs. VREF (MAX11205A/MAX11205B) 2.4 2.3 MAX11205B 1.5 2.2 1.0 0.5 TA = +85°C TA = -45°C -1.0 2.70 3.00 3.15 3.30 3.45 1.5 2.0 2.5 3.0 3.5 -45 15 35 55 75 FULL-SCALE ERROR vs. TEMPERATURE (MAX11205A/MAX11205B) PSRR vs.
PAGE 7
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface NORMAL-MODE FREQUENCY RESPONSE (MAX11205B) -20 -20 -40 -40 GAIN (dB) GAIN (dB) MAX11205 toc20 0 MAX11205 toc19 0 NORMAL-MODE REJECTION OF 50Hz TO 60Hz (MAX11205B) -60 -80 -60 -80 -100 -100 -120 -120 -140 10 1 100 -140 1k 40 FREQUENCY (Hz) 45 50 55 60 65 70 FREQUENCY (Hz) Functional Diagram TIMING AVDD CLOCK GENERATOR CLK DIGITAL LOGIC AND SERIALINTERFACE CONTROLLER SCLK DVDD GND AINP A
PAGE 8
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface MAX11205 Pin Configuration TOP VIEW GND 1 10 CLK REFP 2 REFN 3 AINN 4 7 DVDD AINP 5 6 AVDD MAX11205 9 SCLK 8 RDY/DOUT µMAX Pin Description PIN NAME 1 GND Ground. Ground reference for analog and digital circuitry. FUNCTION 2 REFP Differential Reference Positive Input. REFP must be more positive than REFN. Connect REFP to a voltage between AVDD and GND.
PAGE 9
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface The MAX11205 is an ultra-low power (< 240FA active), high-resolution, low-speed, 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, which requires no external components.
PAGE 10
MAX11205 16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface Data Read Following Every Conversion The MAX11205 indicates conversion data availability, as well as allows the retrieval of data through the RDY/DOUT output. The RDY/DOUT output idles at the value of the last bit read unless a 25th SCLK pulse is provided, causing RDY/DOUT to idle high. RDY/DOUT is pulled low when the conversion data is available. Figure 1 shows the timing diagram for the data read.
PAGE 11
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface MAX11205 t1 t5 t2 SCLK 1 2 3 24 t3 t4 RDY/DOUT D15 D14 0 t6 CONVERSION IS DONE DATA IS AVAILABLE CONVERSION IS DONE DATA IS AVAILABLE t7 Figure 1. Timing Diagram for Data Read After Conversion SCLK 1 2 3 24 25 25TH SLK RISING EDGE PULLS RDY/DOUT HIGH RDY/DOUT D14 D15 0 CONVERSION IS DONE DATA IS AVAILABLE CONVERSION IS DONE DATA IS AVAILABLE Figure 2.
PAGE 12
MAX11205 16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface DEVICE ENTERS SLEEP MODE SCLK 1 2 3 DEVICE EXITS OUT SLEEP MODE 1 24 2 SLEEP MODE t9 t10 RDY/DOUT D14 D15 0 D15 CONVERSION IS DONE DATA IS AVAILABLE D14 CONVERSION IS DONE DATA IS AVAILABLE t11 Figure 4.
PAGE 13
16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface See Figure 6 for the RTD temperature measurement circuit and Figure 7 for a resistive bridge measurement circuit. For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 14
MAX11205 16-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface Revision History REVISION NUMBER REVISION DATE 0 4/10 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.