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General Description

The MAX1027/MAX1029/MAX1031 are serial 10-bit ana-

log-to-digital converters (ADCs) with an internal reference

and an internal temperature sensor. These devices fea-

ture on-chip FIFO, scan mode, internal clock mode, inter-

nal averaging, and AutoShutdown™. The maximum

sampling rate is 300ksps using an external clock. The

MAX1031 has 16 input channels, the MAX1029 has 12

input channels, and the MAX1027 has 8 input channels.

All input channels are configurable for single-ended or

differential inputs in unipolar or bipolar mode. All three

devices operate from a +5V supply and contain a 10MHz

SPI™/QSPI™/MICROWIRE™-compatible serial port.

The MAX1031 is available in 28-pin 5mm x 5mm QFN

with exposed pad and 24-pin QSOP packages. The

MAX1027/MAX1029 are only available in QSOP pack-

ages. All three devices are specified over the extended

-40°C to +85°C temperature range.

________________________Applications

System Supervision

Data-Acquisition Systems

Industrial Control Systems

Patient Monitoring

Data Logging

Instrumentation

Features

♦ Internal Temperature Sensor (±1°C Accuracy)

♦ 16-Entry First-In/First-Out (FIFO)

♦ Analog Multiplexer with True Differential

Track/Hold

16-, 12-, 8-Channel Single Ended

8-, 6-, 4-Channel True Differential

(Unipolar or Bipolar)

♦ Accuracy: ±1 LSB INL, ±1 LSB DNL, No Missing

Codes Over Temperature

♦ Scan Mode, Internal Averaging, and Internal Clock

♦ Low-Power Single +3V Operation

1mA at 300ksps

♦ Internal 2.5V Reference or External Differential

Reference

♦ 10MHz 3-Wire SPI/QSPI/MICROWIRE-Compatible

Interface

♦ Space-Saving 28-Pin 5mm x 5mm QFN Package

MAX1027/MAX1029/MAX1031

10-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-2854; Rev 1; 7/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Ordering Information

*Future product—contact factory for availability.

Ordering Information continued at end of data sheet.

AIN0

EOC

DOUT

DIN

SCLK

GND

REF+

MAX1027

QSOP

AIN1

AIN2

AIN5

AIN3

AIN4

REF-/AIN6

CNVST/AIN7

EOC

DOUT

DIN

CSAIN3

AIN2

AIN1

AIN0

SCLK

GND

REF+AIN7

AIN6

AIN5

AIN4

CNVST/AIN11

REF-/AIN10AIN9

AIN8

MAX1029

QSOP

TOP VIEW

PART TEMP RANGE PIN-PACKAGE

MAX1027ACEE-T* 0°C to +70°C 16 QSOP

MAX1027AEEE-T* -40°C to +85°C 16 QSOP

Pin Configurations continued at end of data sheet.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Summary of content (24 pages)

PAGE 1
9-2854; Rev 1; 7/03 KIT ATION EVALU E L B A AVAIL 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Features ♦ Internal Temperature Sensor (±1°C Accuracy) The MAX1031 is available in 28-pin 5mm x 5mm QFN with exposed pad and 24-pin QSOP packages. The MAX1027/MAX1029 are only available in QSOP packages. All three devices are specified over the extended -40°C to +85°C temperature range. ♦ Low-Power Single +3V Operation 1mA at 300ksps ♦ Internal 2.
PAGE 2
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V CS, SCLK, DIN, EOC, DOUT to GND.........-0.3V to (VDD + 0.3V) AIN0–AIN13, REF-/AIN_, CNVST/AIN_, REF+ to GND.........................................-0.3V to (VDD + 0.3V) Maximum Current into Any Pin............................................50mA Continuous Power Dissipation (TA = +70°C) 16-Pin QSOP (derate 8.
PAGE 3
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference (VDD = +2.7V to +3.6V, fSAMPLE = 300kHz, fSCLK = 4.8MHz (50% duty cycle), VREF = 2.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CONVERSION RATE Power-Up Time tPU Acquisition Time tACQ Conversion Time tCONV External Clock Frequency fSCLK External reference 0.8 Internal reference (Note 3) 65 µs 0.6 Internally clocked 3.
PAGE 4
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference ELECTRICAL CHARACTERISTICS (continued) (VDD = +2.7V to +3.6V, fSAMPLE = 300kHz, fSCLK = 4.8MHz (50% duty cycle), VREF = 2.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS (SCLK, DIN, CS, CNVST) Input Voltage Low VIL Input Voltage High VIH Input Hysteresis VDD x 0.3 VDD x 0.
PAGE 5
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference PARAMETER SYMBOL SCLK Clock Period tCP SCLK Duty Cycle tCH CONDITIONS MIN Externally clocked conversion 208 Data I/O 100 TYP MAX UNITS ns 40 60 % SCLK Fall to DOUT Transition tDOT CLOAD = 30pF 40 ns CS Rise to DOUT Disable tDOD CLOAD = 30pF 40 ns CS Fall to DOUT Enable tDOE CLOAD = 30pF 40 ns DIN to SCLK Rise Setup tDS SCLK Rise to DIN Hold tDH CS to SCLK Rise Setup tCSS SCLK Rise to CS Hold 40 tCSH ns
PAGE 6
Typical Operating Characteristics (continued) (VDD = +3V, VREF = +2.5V, fSCLK = 4.8MHz, CLOAD = 30pF, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SAMPLING RATE 60 40 MAX1027/29/31 toc05 500 400 650 600 550 300 20 0 200 10 100 1000 500 1 FREQUENCY (kHz) 10 100 1000 SUPPLY CURRENT vs. TEMPERATURE 0.4 0.3 0.2 625 fS = 300ksps SUPPLY CURRENT (µA) MAX1027/29/31 toc07 SHUTDOWN SUPPLY CURRENT (µA) 0.5 3.3 SUPPLY VOLTAGE (V) SHUTDOWN SUPPLY CURRENT vs.
PAGE 7
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference OFFSET ERROR vs. SUPPLY VOLTAGE 2.502 2.498 0.5 2.494 0.4 0.3 0.2 0.6 0.5 0.1 -15 10 35 60 0.3 0.2 0 2.7 85 TEMPERATURE (°C) 3.0 3.3 3.6 -40 -15 SUPPLY VOLTAGE (V) 35 60 85 GAIN ERROR vs. TEMPERATURE 0.4 GAIN ERROR (LSB) 0.2 MAX1027/29/31 toc15 0.5 MAX1027/29/31 toc14 0.4 10 TEMPERATURE (°C) GAIN ERROR vs. SUPPLY VOLTAGE 0.6 0.3 0.2 0 0.1 -0.2 0 2.7 3.0 3.6 3.
PAGE 8
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference MAX1027/MAX1029/MAX1031 Pin Description 8 MAX1031 QFN MAX1031 QSOP MAX1029 MAX1027 NAME 2–12, 26, 27, 28 1–14 — — AIN0–13 — — 1–10 — AIN0–9 Analog Inputs — — — 1–6 AIN0–5 Analog Inputs 13 15 — — REF-/AIN14 Negative Input for External Differential Reference/Analog Input 14. See Table 3 for details on programming the setup register.
PAGE 9
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference MAX1027/MAX1029/MAX1031 CS tCP tCH tCSS tCSH tCSH tCSS SCLK tDH tDS DIN tDOD tDOT tDOE DOUT Figure 1. Detailed Serial-Interface Timing Diagram CS DIN SCLK SERIAL INTERFACE OSCILLATOR CONTROL DOUT EOC CNVST AIN1 AIN2 T/H AIN15 12-BIT SAR ADC FIFO AND ACCUMULATOR TEMP SENSE REFINTERNAL REFERENCE REF+ MAX1027 MAX1029 MAX1031 Figure 2.
PAGE 10
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Detailed Description The MAX1027/MAX1029/MAX1031 are low-power, serial-output, multichannel ADCs with temperature-sensing capability for temperature-control, process-control, and monitoring applications. These 10-bit ADCs have internal track and hold (T/H) circuitry that supports singleended and fully differential inputs.
PAGE 11
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference REF GND AIN0-AIN15 (SINGLE ENDED); AIN0, AIN2, AIN4…AIN14 (DIFFERENTIAL) CIN+ DAC COMPARATOR + HOLD GND (SINGLE ENDED); AIN1, AIN3, AIN5…AIN15 (DIFFERENTIAL) CIN- HOLD HOLD VDD/2 Figure 3. Equivalent Input Circuit In differential mode, the T/H samples the difference between two analog inputs, eliminating common-mode DC offsets and noise.
PAGE 12
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference temperature measurement is performed before the first temperature result is read out, the old measurement is overwritten by the new result. Temperature results are in degrees Celsius (two’s complement) at a resolution of 1/8 of a degree. See the Temperature Measurements section for details on converting the digital code to a temperature.
PAGE 13
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference BIT NAME — BIT FUNCTION 7 (MSB) Set to 1 to select conversion register. CHSEL3 6 Analog input channel select. CHSEL2 5 Analog input channel select. CHSEL1 4 Analog input channel select. CHSEL0 3 Analog input channel select. SCAN1 2 Scan mode select. SCAN0 1 Scan mode select. TEMP Set to 1 to take a single temperature 0 (LSB) measurement. The first conversion result of a scan contains temperature information.
PAGE 14
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Table 3. Setup Register* BIT NAME BIT FUNCTION — 7 (MSB) — 6 Set to 1 to select setup register. CKSEL1 5 Clock mode and CNVST configuration. Resets to 1 at power-up. Set to zero to select setup register. CKSEL0 4 Clock mode and CNVST configuration. REFSEL1 3 Reference mode configuration. REFSEL0 2 Reference mode configuration.
PAGE 15
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Reset Register Write to the reset register (as shown in Table 7) to clear the FIFO or to reset all registers to their default states. Set the RESET bit to 1 to reset the FIFO. Set the reset bit to zero to return the MAX1027/MAX1029/MAX1031 to its default power-up state. Power-Up Default State The MAX1027/MAX1029/MAX1031 power up with all blocks in shutdown, including the reference.
PAGE 16
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Table 6. Averaging Register* BIT NAME BIT — 7 (MSB) Set to zero to select averaging register. FUNCTION — 6 Set to zero to select averaging register. Set to 1 to select averaging register. — 5 AVGON 4 Set to 1 to turn averaging on. Set to zero to turn averaging off. NAVG1 3 Configures the number of conversions for single channel scans.
PAGE 17
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Externally Timed Acquisitions and Internally Timed Conversions with CNVST Performing Conversions in Clock Mode 00 In clock mode 00, the wake up, acquisition, conversion, and shutdown sequences are initiated through CNVST and performed automatically using the internal oscillator. Results are added to the internal FIFO to be read out later. See Figure 4 for clock mode 00 timing.
PAGE 18
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference CNVST (CONVERSION2) (ACQUISITION1) (ACQUISITION2) CS (CONVERSION1) SCLK DOUT MSB1 LSB1 MSB2 EOC REQUEST MULTIPLE CONVERSIONS BY SETTING CNVST LOW FOR EACH CONVERSION. X = DON'T CARE. Figure 5. Clock Mode 01 (CONVERSION BYTE) DIN (UP TO 514 INTERNALLY CLOCKED ACQUISITIONS AND CONVERSIONS) CS SCLK DOUT MSB1 LSB1 MSB2 EOC THE CONVERSION BYTE BEGINS THE ACQUISITION. CNVST IS NOT REQUIRED. X = DON'T CARE.
PAGE 19
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference (ACQUISITION1) (CONVERSION1) (ACQUISITION2) CS SCLK DOUT MSB1 LSB1 MSB2 EOC EXTERNALLY TIMED ACQUISITION, SAMPLING AND CONVERSION WITHOUT CNVST. X = DON'T CARE. Figure 7. Clock Mode 11 clock. Scanning and averaging are disabled, and the conversion result is available at DOUT during the conversion. See Figure 7 for clock mode 11 timing. Initiate a conversion by writing a byte to the conversion register followed by 16 SCLK cycles.
PAGE 20
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference OUTPUT CODE OUTPUT CODE FULL-SCALE TRANSITION 11 . . . 111 11 . . . 110 11 . . . 101 011 . . . 111 FS = VREF + VCOM 2 011 . . . 110 ZS = COM 000 . . . 010 000 . . . 001 FS = VREF + VCOM -VREF 2 V 1 LSB = REF 1024 -FS = 000 . . . 000 111 . . . 111 ZS = VCOM V 1 LSB = REF 1024 00 . . . 011 111 . . . 110 111 . . . 101 00 . . . 010 100 . . . 001 00 . . . 001 100 . . . 000 00 . . .
PAGE 21
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Ordering Information (continued) MAX1027BCEE-T 0°C to +70°C 16 QSOP MAX1027BEEE-T -40°C to +85°C 16 QSOP MAX1029ACEP-T* 0°C to +70°C 20 QSOP ENOB = (SINAD - 1.76) / 6.
PAGE 22
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) QSOP.EPS MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference PACKAGE OUTLINE, QSOP .150", .
PAGE 23
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference 32L QFN.EPS PACKAGE OUTLINE, 16,20,28,32L QFN, 5x5x0.90 MM 1 21-0091 I 2 ______________________________________________________________________________________ 23 MAX1027/MAX1029/MAX1031 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.
PAGE 24
MAX1027/MAX1029/MAX1031 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) PACKAGE OUTLINE, 16,20,28,32L QFN, 5x5x0.90 MM 2 21-0091 I 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.