Datasheet

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MAX1082/MAX1083

300ksps/400ksps, Single-Supply, 4-Channel,

Serial 10-Bit ADCs with Internal Reference

General Description

The MAX1082/MAX1083 10-bit analog-to-digital convert-

ers (ADCs) combine a 4-channel analog-input multiplexer,

high-bandwidth track/hold (T/H), and serial interface with

high conversion speed and low power consumption. The

MAX1082 operates from a single +4.5V to +5.5V supply;

the MAX1083 operates from a single +2.7V to +3.6V sup-

ply. Both devices’ analog inputs are software configurable

for unipolar/bipolar and single-ended/pseudo-differential

operation.

The 4-wire serial interface connects directly to SPI/QSPI™

and MICROWIRE

devices without external logic. A serial

strobe output allows direct connection to TMS320-family

digital signal processors. The MAX1082/ MAX1083 use an

external serial-interface clock to perform successive-

approximation analog-to-digital conversions. The devices

feature an internal +2.5V reference and a reference-buffer

amplifier with a ±1.5% voltage-adjustment range. An

external reference with a 1V to V

range may also be

used.

The MAX1082/MAX1083 provide a hard-wired SHDN pin

and four software-selectable power modes (normal opera-

tion, reduced power (REDP), fast power-down (FASTPD),

and full power-down (FULLPD)). These devices can be

programmed to shut down automatically at the end of a

conversion or to operate with reduced power. When using

the power-down modes, accessing the serial interface

automatically powers up the devices, and the quick turn-

on time allows them to be shut down between all conver-

sions.

The MAX1082/MAX1083 are available in 16-pin TSSOP

packages.

Applications

Portable Data Logging

Data Acquisition

Medical Instruments

Battery-Powered Instruments

Pen Digitizers

Process Control

Features

o 4-Channel Single-Ended or 2-Channel

Pseudo-Differential Inputs

o Internal Multiplexer and Track/Hold

o Single-Supply Operation

+4.5V to +5.5V (MAX1082)

+2.7V to +3.6V (MAX1083)

o Internal +2.5V Reference

o 400kHz Sampling Rate (MAX1082)

o Low Power: 2.5mA (400ksps)

1.3mA (REDP)

0.9mA (FASTPD)

2µA (FULLPD)

o SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire

Serial Interface

o Software-Configurable Unipolar or Bipolar Inputs

o 16-Pin TSSOP Package

DD1

DD2

SCLK

DIN

SSTRB

DOUT

GND

REFADJ

TOP VIEW

MAX1082

MAX1083

TSSOP

CH0

CH1

COM

CH2

CH3

SHDN

REF

19-1690 Rev 2; 12/14

Typical Operating Circuit appears at end of data sheet.

Pin Configuration

QSPI is a trademark of Motorola, Inc.

MICROWIRE is a registered trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

Ordering Information

PART TEMP RANGE

PIN-

PACKAGE

INL

(LSB)

MAX1082ACUE+ 0°C to +70°C 16 TSSOP ±1/2

MAX1082BCUE+ 0°C to +70°C 16 TSSOP ±1

MAX1082AEUE+ -40°C to +85°C 16 TSSOP ±1/2

MAX1082BEUE+ -40°C to +85°C 16 TSSOP ±1

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

Summary of content (23 pages)

PAGE 1
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference General Description Features The MAX1082/MAX1083 10-bit analog-to-digital converters (ADCs) combine a 4-channel analog-input multiplexer, high-bandwidth track/hold (T/H), and serial interface with high conversion speed and low power consumption. The MAX1082 operates from a single +4.5V to +5.5V supply; the MAX1083 operates from a single +2.7V to +3.6V supply.
PAGE 2
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS VDD_ to GND............................................................ -0.3V to +6V VDD_ to VDD2 ....................................................... -0.3V to +0.3V CH0–CH3, COM to GND ........................... -0.3V to (VDD + 0.3V) REF, REFADJ to GND................................ -0.3V to (VDD + 0.3V) Digital Inputs to GND .............................................. -0.
PAGE 3
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX1082 (continued) (VDD1 = VDD2 = +4.5V to +5.5V, COM = GND, fOSC = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external +2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX1082 (continued) (VDD1 = VDD2 = +4.5V to +5.5V, COM = GND, fOSC = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external +2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.
PAGE 5
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX1083 (continued) (VDD1 = VDD2 = +2.7V to +3.6V, COM = GND, fOSC = 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), external +2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX1083 (continued) (VDD1 = VDD2 = +2.7V to +3.6V, COM = GND, fOSC = 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), external +2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference TIMING CHARACTERISTICS—MAX1083 (Figures 1, 2, 5, 6; VDD1 = VDD2 = +2.7V to +3.6V; TA = TMIN to TMAX; unless otherwise noted.
PAGE 8
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Typical Operating Characteristics (MAX1082: VDD1 = VDD2 = 5.0V, fSCLK = 6.4MHz; MAX1083: VDD1 = VDD2 = 3.0V, fSCLK = 4.8MHz; CLOAD = 20pF, 4.7µF capacitor at REF, 0.01µF capacitor at REFADJ, TA = +25°C, unless otherwise noted.) INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE 0.10 DNL (LSB) 0.05 0.05 0 0 -0.05 -0.05 -0.10 MAX1080/1-03 0.10 SUPPLY CURRENT (mA) 0.15 3.5 MAX1080/1-02 0.
PAGE 9
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Typical Operating Characteristics (continued) (MAX1082: VDD1 = VDD2 = 5.0V, fSCLK = 6.4MHz; MAX1083: VDD1 = VDD2 = 3.0V, fSCLK = 4.8MHz; CLOAD = 20pF, 4.7µF capacitor at REF, 0.01µF capacitor at REFADJ, TA = +25°C, unless otherwise noted.) REFERENCE VOLTAGE vs. TEMPERATURE OFFSET ERROR vs. SUPPLY VOLTAGE 2.4998 MAX1083 2.4994 2.4992 0 MAX1080/1-12 0 OFFSET ERROR (LSB) 0.
PAGE 10
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Pin Description PIN NAME FUNCTION 1 VDD1 Positive Supply Voltage 2–5 CH0–CH3 Sampling Analog Inputs 6 COM Ground Reference for Analog Inputs. COM sets zero-code voltage in single-ended mode. Must be stable to ±0.5LSB. 7 SHDN Active-Low Shutdown Input. Pulling SHDN low shuts down the device, reducing supply current to 2µA (typ). 8 REF Reference-Buffer Output/ADC Reference Input.
PAGE 11
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Detailed Description The MAX1082/MAX1083 ADCs use a successiveapproximation conversion technique and input T/H circuitry to convert an analog signal to a 10-bit digital output. A flexible serial interface provides easy interface to microprocessors (µPs). Figure 3 shows a functional diagram of the MAX1082/MAX1083.
PAGE 12
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Track/Hold The T/H enters its tracking mode on the falling clock edge after the fifth bit of the 8-bit control word has been shifted in. It enters its hold mode on the falling clock edge after the eighth bit of the control word has been shifted in. If the converter is set up for single-ended inputs, IN- is connected to COM and the converter samples the “+” input.
PAGE 13
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Table 1. Channel Selection in Single-Ended Mode (SGL/DIF = 1) SEL2 0 SEL1 0 SEL0 1 1 0 1 0 1 0 1 1 0 CH0 + CH1 CH2 CH3 COM – + – + – + – Table 2.
PAGE 14
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Table 3. Control-Byte Format BIT 7 (MSB) BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 (LSB) START SEL2 SEL1 SEL0 UNI/BIP SGL/DIF PD1 PD0 BIT NAME 7(MSB) START The first logic “1” bit after CS goes low defines the beginning of the control byte. DESCRIPTION 6 5 4 SEL2 SEL1 SEL0 These 3 bits select which of the eight channels are used for the conversion (Tables 1 and 2).
PAGE 15
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference CS tACQ SCLK 1 4 8 9 12 16 20 24 SEL SEL SEL UNI/ SGL/ 2 1 0 BIP DIF PD2 PD2 DIN START SSTRB RB1 RB2 B9 B8 RB3 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0 DOUT A/D STATE IDLE 400ns CONVERSION IDLE (CLK = 6.4MHz) Figure 5. Single-Conversion Timing Software Power-Down Software power-down is activated using bits PD1 and PD0 of the control byte.
PAGE 16
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference CS tCSW tCSS tCP tCH tCSO tCSH tCS1 tCL #10 SCLK tDH tDS tDOH DIN tDOV tDOD tDOE DOUT tSTE tSTH tSTV tSTD SSTRB Figure 6. Detailed Serial-Interface Timing mode (PD1 = PD0 = 0), with an external reference and conversion controlled at the maximum clock speed.
PAGE 17
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference CS DIN S CONTROL BYTE 0 1 S CONTROL BYTE 1 8 12 16 1 5 8 S CONTROL BYTE 2 12 16 1 5 S 8 12 ETC 16 1 5 SCLK B9 DOUT B4 S0 CONVERSION RESULT 0 B9 B4 S0 CONVERSION RESULT 1 B9 B4 SSTRB Figure 7. Continuous 16-Clock/Conversion Timing 10,000 MAX1083, VDD1 = VDD 2= 3.0V CLOAD = 20pF CODE = 1010100000 1.25 SUPPLY CURRENT (μA) REFERENCE POWER-UP DELAY (ms) 1.50 1.00 0.75 0.
PAGE 18
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference unipolar operation, and 1LSB = 2.44mV [(2.500V / 2) / 1024] for bipolar operation. capacitors close to VDD1 of the MAX1082/MAX1083. Minimize capacitor lead lengths for best supply-noise rejection. If the power supply is very noisy, a 10Ω resistor can be connected as a lowpass filter (Figure 15).
PAGE 19
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference +3.3V OUTPUT CODE 24kΩ MAX1082 MAX1083 510kΩ 100k 12 011 . . . 111 V FS = REF + VCOM 2 011 . . . 110 ZS = VCOM REFADJ 000 . . . 010 0.047μF 000 . . . 001 000 . . . 000 -VREF + VCOM 2 V 1LSB = REF 1024 -FS = 111 . . . 111 111 . . . 110 Figure 12. MAX1082/MAX1083 Reference-Adjust Circuit 111 . . . 101 100 . . . 001 OUTPUT CODE 100 . . . 000 FULL-SCALE TRANSITION 11 . . .
PAGE 20
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Table 5. Full Scale and Zero Scale UNIPOLAR MODE BIPOLAR MODE Full Scale Zero Scale Positive Full Scale VREF + VCOM VCOM VREF / 2 + VCOM Zero Scale Negative Full Scale VCOM -VREF / 2 + VCOM clock jitter, etc.
PAGE 21
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference +5V OR +3V 10μF +5V OR +3V 0.1μF 1 VDD1 VDD2 16 2 CH0 SCLK 15 0.1μF 10μF (POWER SUPPLIES) SCK 3 CH1 ANALOG INPUTS MAX1082 MAX1083 CSB 14 4 CH2 DIN 13 5 CH3 SSTRB 12 6 COM DOUT 11 7 SHDN GND 10 PCS0 MOSI MC683XX MISO VDD1 4.7μF REFADJ 9 8 REF 0.01μF (GND) Figure 16.
PAGE 22
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference CS SCLK START DIN SSTRB SEL2 SEL1 SEL0 UNI/BIP SGI/DIF PD1 PD0 HIGH IMPEDANCE DOUT B8 MSB S1 S0 HIGH IMPEDANCE Figure 18. MAX1082/MAX1083-to-TMS320 Serial Interface Typical Operating Circuit +5V OR +3V CH0 0 TO +2.5V ANALOG INPUTS VDD1 PART VDD TEMP RANGE PINPACKAGE INL (LSB) 0°C to +70°C 16 TSSOP ±1/2 MAX1083ACUE+ 0.
PAGE 23
MAX1082/MAX1083 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 5/00 Initial release — 1 9/12 Added lead-free notation to Ordering Information. 1 2 12/14 Corrected Absolute Maximum Ratings 2 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.