Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External uMAX 10

_______________________________________________________________ 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.

MAX11201

24-Bit, Single-Channel, Ultra-Low-Power, Delta

Sigma ADC with 2-Wire Serial Interface

General Description

The MAX11201 is an ultra-low-power (< 320FA 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 MAX11201

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 100dB rejection of 50Hz or 60Hz

line noise. The MAX11201 provides a simple 2-wire serial

interface in the space-saving, 10-pin FMAX

package.

The MAX11201 operates over the -40NC to +85NC tem-

perature range.

Applications

Features

S 23.3-Bit ENOB

20.6-Bit Noise-Free Resolution at 13.75sps

19.1-Bit Noise-Free Resolution at 120sps

S 700nV

RMS

Noise ±3.6V

Input (MAX11201B)

S INL: 3ppm (typ), 10ppm (max)

S No Missing Codes

S Ultra-Low Power Dissipation

Operating Mode Current Drain < 320µA (max)

Sleep Mode Current Drain < 0.4µA

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 and Reference Inputs

S High-Impedance Inputs

Buffers on Signal Inputs

S Programmable Internal System Clock or External

Clock

2.4576MHz (MAX11201A)

2.25275MHz (MAX11201B)

S > 100dB (min) 50Hz/60Hz Rejection (MAX11201B)

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

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

19-5333; Rev 0; 6/10

Ordering Information

Note: All devices are specified over the -40°C to +85°C oper-

ating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

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

Selector Guide

Sensor Measurement

(Temperature and

Pressure)

Portable Instrumentation

Battery Applications

Weigh Scales

EVALUATION KIT

AVAILABLE

PART PIN-PACKAGE

OUTPUT RATE

(sps)

MAX11201AEUB+

10 FMAX

120

MAX11201BEUB+

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
TION KIT EVALUA BLE AVAILA 19-5333; Rev 0; 6/10 24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface Features The MAX11201 is an ultra-low-power (< 320FA 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
MAX11201 24-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
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface (VAVDD = +3.6V, VDVDD = +1.7V, 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 AIN_ Dynamic Input Current ±20 nA REF_ Dynamic Input Current ±30 nA 5 pF AIN_ Input Capacitance REF_ Input Capacitance 7.
PAGE 4
MAX11201 24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +3.6V, VDVDD = +1.7V, 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
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface TA = +85°C 140 120 120 100 2.85 3.00 3.15 3.30 3.45 3.30 3.45 AVDD VOLTAGE (V) 100 TOTAL 200 VAVDD = 3.0V 150 100 VDVDD = 1.8V VDVDD = 1.8V 50 0 0.8 -25 -5 15 35 55 75 95 -45 -25 -5 0.4 0.2 0 15 35 55 75 TOTAL DVDD AVDD 0 95 -45 -25 -5 15 35 55 75 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) DIGITAL ACTIVE CURRENT vs. DVDD VOLTAGE DIGITAL SLEEP CURRENT vs.
PAGE 6
Typical Operating Characteristics (continued) (VAVDD = 3.6V, VDVDD = 1.8V, VREFP - VREFN = AVDD; internal clock; TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = +25NC.) VREF = 2.5V 3.5 3.0 MAX11201B 2.0 1.5 MAX11201B 1.0 2.2 3.0 MAX11201A 2.5 2.85 3.00 3.15 3.30 3.45 3.60 MAX11201B 0 -45 -5 15 35 55 TEMPERATURE (°C) NOISE HISTOGRAM (MAX11201A, 120sps) NOISE HISTOGRAM (MAX11201B, 13.75sps) LONG-TERM ADC READINGS (MAX11201A) 6 4 0.5 1.0 1.5 2.0 2.
PAGE 7
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface TUE vs. INPUT VOLTAGE 4 INL (ppmFSR) 0 TA = +85°C -2 0 TA = +85°C -2 TA = +25°C -4 TA = +25°C 2 -4 -6 -6 -8 -8 TA = -45°C -10 -10 -2.5 -2.0 -1.5 -1.0 -0.5 0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 2.5 INPUT VOLTAGE (V) PSRR vs. FREQUENCY (MAX11201A) PSRR vs.
PAGE 8
MAX11201 24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface Pin Configuration TOP VIEW + GND 1 10 CLK REFP 2 REFN 3 AINN 4 7 DVDD AINP 5 6 AVDD MAX11201 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
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface TIMING AVDD CLOCK GENERATOR CLK DIGITAL LOGIC AND SERIALINTERFACE CONTROLLER SCLK DVDD GND AINP AINN 3RD-ORDER DELTA-SIGMA MODULATOR DIGITAL FILTER (SINC4) RDY/DOUT REFP REFN MAX11201 Detailed Description The MAX11201 is an ultra-low-power (< 245FA active), high-resolution, low-speed, serial-output ADC.
PAGE 10
MAX11201 24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface Reference The MAX11201 provides differential inputs REFP and REFN for an external reference voltage. Connect the external reference directly across the REFP and REFN to obtain the differential reference voltage. The commonmode voltage range for VREFP and VREFN is between 0 and VAVDD. The differential voltage range for REFP and REFN is 1.25V to VAVDD.
PAGE 11
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface MAX11201 t1 t5 t2 SCLK 1 2 3 24 t3 t4 RDY/DOUT D22 D23 D0 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 D23 D22 D0 CONVERSION IS DONE DATA IS AVAILABLE CONVERSION IS DONE DATA IS AVAILABLE Figure 2.
PAGE 12
MAX11201 24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface CALIBRATION STARTS ON 26TH SCLK SCLK 2 1 3 24 25 26 1 2 25TH SCLK PULLS RDY/DOUT HIGH RDY/DOUT D23 D22 D0 D23 CONVERSION IS DONE DATA IS AVAILABLE D22 CONVERSION IS DONE DATA IS AVAILABLE AFTER CALIBRATION t8 Figure 3.
PAGE 13
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface 1 SCLK 2 3 DEVICE ENTERS SLEEP MODE 24 25 DEVICE EXITS OUT SLEEP MODE AND STARTS CALIBRATION 1 26 2 SLEEP MODE t10 RDY/DOUT D22 D23 D0 D23 CONVERSION IS DONE DATA IS AVAILABLE D22 CONVERSION IS DONE DATA IS AVAILABLE AFTER CALIBRATION t12 Figure 5.
PAGE 14
24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface MAX11201 Revision History REVISION NUMBER REVISION DATE 0 6/10 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.