Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External , Internal QSOP 20

General Description

The MAX1026/MAX1028/MAX1030 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

MAX1030 has 16 input channels, the MAX1028 has 12

input channels, and the MAX1026 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 MAX1030 is available in 28-pin 5mm x 5mm TQFN

with exposed pad and 24-pin QSOP packages. The

MAX1026/MAX1028 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

o Internal Temperature Sensor (±0.7°C Accuracy)

o 16-Entry First-In/First-Out (FIFO)

o Analog Multiplexer with True Differential

Track/Hold

16-, 12-, 8-Channel Single Ended

8-, 6-, 4-Channel True Differential

(Unipolar or Bipolar)

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

Codes Over Temperature

o Scan Mode, Internal Averaging, and Internal Clock

o Low-Power Single +5V Operation

2.3mA at 300ksps

o Internal 4.096V Reference or External Differential

Reference

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

Interface

o Space-Saving 28-Pin 5mm x 5mm TQFN Package

MAX1026/MAX1028/MAX1030

10-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

________________________________________________________________

Maxim Integrated Products

Pin Configurations

19-2853; Rev 4; 4/11

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.

EVALUATION KIT

AVAILABLE

Ordering Information

Ordering Information 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.

AIN0

EOC

DOUT

DIN

SCLK

GND

REF+

MAX1026

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

MAX1028

QSOP

TOP VIEW

PART TEMP RANGE PIN-PACKAGE

MAX1026BCEE+T 0°C to +70°C 16 QSOP

MAX1026BEEE+T -40°C to +85°C 16 QSOP

MAX1028BCEP+T 0°C to +70°C 20 QSOP

MAX1028BEEP+T -40°C to +85°C 20 QSOP

Pin Configurations continued at end of data sheet.

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

= Tape and reel.

Summary of content (22 pages)

PAGE 1
9-2853; Rev 4; 4/11 KIT ATION EVALU E L B A AVAIL 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference The MAX1026/MAX1028/MAX1030 are serial 10-bit analog-to-digital converters (ADCs) with an internal reference and an internal temperature sensor. These devices feature on-chip FIFO, scan mode, internal clock mode, internal averaging, and AutoShutdown™. The maximum sampling rate is 300ksps using an external clock.
PAGE 2
MAX1026/MAX1028/MAX1030 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 = +5V ±5%, fSAMPLE = 300kHz, fSCLK = 4.8MHz (50% duty cycle), VREF = 4.096V, 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 Internally clocked 3.5 μs 0.
PAGE 4
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference ELECTRICAL CHARACTERISTICS (continued) (VDD = +5V ±5%, fSAMPLE = 300kHz, fSCLK = 4.8MHz (50% duty cycle), VREF = 4.096V, 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)(Note 8) Input Voltage Low VIL Input Voltage High VIH Input Hysteresis 0.8 2.
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 40 ns 0 ns CS Fall to SCLK Rise Setup Time tCSS0 CS Fall to
PAGE 6
Typical Operating Characteristics (continued) (VDD = +5V, VREF = +4.096V, fSCLK = 4.8MHz, CLOAD = 30pF, TA = +25°C, unless otherwise noted.) 60 40 1000 800 600 0 200 10 100 1000 1000 10 1 FREQUENCY (kHz) 100 1000 5.05 5.15 SUPPLY CURRENT vs. TEMPERATURE fS = 300ksps 1250 SUPPLY CURRENT (μA) 0.5 4.95 1300 MAX1026/28/30 toc07 SHUTDOWN SUPPLY CURRENT (μA) 0.6 4.85 SUPPLY VOLTAGE (V) SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 0.4 0.3 0.2 0.1 1200 1150 1100 1050 0 1000 4.85 4.95 5.
PAGE 7
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference OFFSET ERROR vs. SUPPLY VOLTAGE 4.049 0.5 0.4 0.3 0.2 0.6 MAX1026/28/30 toc13 MAX1026/28/30 toc12 0.6 OFFSET ERROR (LSB) MAX1026/28/30 toc11 4.050 0.5 0.4 0.3 0.2 4.048 0.1 0.1 0 4.047 -15 10 35 60 0 4.75 85 4.85 4.95 5.05 5.15 -40 -15 10 35 60 85 TEMPERATURE (°C) GAIN ERROR vs. TEMPERATURE GAIN ERROR vs. SUPPLY VOLTAGE GAIN ERROR (LSB) 0 -0.5 MAX1026/28/30 toc15 0.5 MAX1026/28/30 toc14 0.5 0 -0.5 -1.
PAGE 8
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Pin Description PIN FUNCTION MAX1030 TQFN MAX1030 QSOP MAX1028 MAX1026 NAME 1, 17, 19, 25 — — — N.C. 2–12, 26, 27, 28 1–14 — — AIN0–13 Analog Inputs — — 1–10 — AIN0–9 Analog Inputs — — — 1–6 AIN0–5 8 No Connection. Not internally connected. Analog Inputs 13 15 — — REF-/AIN14 Negative Input for External Differential Reference/Analog Input 14.
PAGE 9
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference MAX1026/MAX1028/MAX1030 CS tCP tCH tCSS tCSH tCSH tCSS SCLK tDH tDS DIN tDOT tDOD 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 REFREF+ INTERNAL REFERENCE MAX1026 MAX1028 MAX1030 Figure 2.
PAGE 10
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Converter Operation The MAX1026/MAX1028/MAX1030 ADCs use a fully differential, successive-approximation register (SAR) conversion technique and an on-chip T/H block to convert temperature and voltage signals into a 10-bit digital result. Both single-ended and differential configurations are supported, with a unipolar signal range for singleended mode and bipolar or unipolar ranges for differential mode.
PAGE 11
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference REF GND AIN0-AIN15 (SINGLE ENDED); AIN0, AIN2, AIN4…AIN14 (DIFFERENTIAL) CIN+ t AQC = 9 x ( R S + RIN ) x 24pF + t PWR DAC COMPARATOR + HOLD GND (SINGLE ENDED); AIN1, AIN3, AIN5…AIN15 (DIFFERENTIAL) CIN- HOLD HOLD VDD/2 Figure 3. Equivalent Input Circuit where RIN = 1.5kΩ, RS is the source impedance of the input signal, and tPWR = 1μs, the power-up time of the device.
PAGE 12
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Applications Information Register Descriptions The MAX1026/MAX1028/MAX1030 communicate between the internal registers and the external circuitry through the SPI/QSPI-compatible serial interface. Table 1 details the registers and the bit names. Tables 2–7 show the various functions within the conversion register, setup register, averaging register, reset register, unipolar register, and bipolar register.
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
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Table 3. Setup Register* BIT NAME BIT — 7 (MSB) FUNCTION Set to zero to select setup register. — 6 Set to 1 to select setup register. CKSEL1 5 Clock mode and CNVST configuration. Resets to 1 at power-up. 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 Temperature Measurements The MAX1026/MAX1028/MAX1030 perform temperature measurements with an internal diode-connected transistor. The diode bias current changes from 68μA to 4μA to produce a temperature-dependent bias voltage difference. The second conversion result at 4μA is subtracted from the first at 68μA to calculate a digital value that is proportional to absolute temperature.
PAGE 16
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Table 6. Averaging Register* BIT NAME BIT FUNCTION — 7 (MSB) Set to zero to select averaging register. — 6 Set to zero to select averaging register. — 5 Set to 1 to select averaging register. AVGON 4 Set to 1 to turn averaging on. Set to zero to turn averaging off. NAVG1 3 NAVG0 2 Configures the number of conversions for single-channel scans.
PAGE 17
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference 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. Initiate a scan by setting CNVST low for at least 40ns before pulling it high again.
PAGE 18
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference CNVST (CONVERSION2) (ACQUISITION1) (ACQUISITION2) CS (CONVERSION1) SCLK DOUT LSB1 MSB1 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) (ACQUISITION2) (CONVERSION1) CS SCLK DOUT MSB1 LSB1 MSB2 EOC EXTERNALLY TIMED ACQUISITION, SAMPLING AND CONVERSION WITHOUT CNVST. X = DON'T CARE. Figure 7.
PAGE 20
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference OUTPUT CODE OUTPUT CODE FULL-SCALE TRANSITION 11 . . . 111 011 . . . 111 V FS = REF + VCOM 2 011 . . . 110 ZS = COM 11 . . . 110 11 . . . 101 000 . . . 010 000 . . . 001 FS = VREF + VCOM 00 . . . 011 -VREF 2 V 1 LSB = REF 1024 -FS = 000 . . . 000 111 . . . 111 ZS = VCOM 111 . . . 110 V 1 LSB = REF 1024 111 . . . 101 00 . . . 010 100 . . . 001 00 . . . 001 100 . . . 000 00 . . .
PAGE 21
10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference TOP VIEW AIN6 7 18 GND AIN7 8 17 REF+ AIN8 9 16 CNVST/AIN15 GND REF+ 16 15 14 CNVST/AIN15 DOUT 23 13 REF-/AIN14 EOC 24 12 AIN13 N.C. 25 11 AIN12 AIN0 26 10 AIN11 AIN1 27 9 AIN10 AIN2 28 8 AIN9 MAX1030 AIN10 11 14 AIN13 1 2 3 AIN11 12 13 AIN12 AIN4 + AIN3 15 REF-/AIN14 17 N.C.
PAGE 22
MAX1026/MAX1028/MAX1030 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Revision History REVISION NUMBER REVISION DATE 3 11/09 Removed the Grade A devices from the Ordering Information table and Electrical Characteristics table. 1, 3, 21 4 4/11 Revised Ordering Information, Electrical Characteristics, Timing Characteristics, Typical Operating Characteristics, Pin Description, Package Information.