Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) Internal SOIC 24 W

_______________General Description

The MAX154/MAX158 are high-speed multi-channel

analog-to-digital converters (ADCs). The MAX154 has

four analog input channels while the MAX158 has eight

channels. Conversion time for both devices is 2.5µs.

The MAX154/MAX158 also feature a 2.5V on-chip refer-

ence, forming a complete high-speed data acquisition

system.

Both converters include a built-in track/hold, eliminating

the need for an external track/hold. The analog input

range is 0V to +5V, although the ADC operates from a

single +5V supply.

Microprocessor interfaces are simplified by the ADC’s

ability to appear as a memory location or I/O port without

the need for external logic. The data outputs use latched,

three-state buffer circuitry to allow direct connection to a

microprocessor data bus or system input port.

________________________Applications

Digital Signal Processing

High-Speed Data Acquisition

Telecommunications

High-Speed Servo Control

Audio Instrumentation

____________________________Features

♦ One-Chip Data Acquisition System

♦ Four or Eight Analog Input Channels

♦ 2.5µs per Channel Conversion Time

♦ Internal 2.5V Reference

♦ Built-In Track/Hold Function

♦

LSB Error Specification

♦ Single +5V Supply Operation

♦ No External Clock

♦ New Space-Saving SSOP Package

______________Ordering Information

MAX154/MAX158

CMOS High-Speed 8-Bit ADCs with

Multiplexer and Reference

________________________________________________________________

Maxim Integrated Products

N.C.

AIN1

AIN2

AIN3

AIN4

TOP VIEW

DB7

DB6

DB5

DB4

DB2

DB1

DB0

REF OUT

RDY

REF

GND

INT

DB3

DIP/SO/SSOP

MAX154

AIN7

AIN8

AIN3

AIN4

AIN5

AIN6

DB7

DB6

DB0

REF OUT

AIN1

AIN2

DB5

DB4

RDY

DB3

DB2

DB1

DIP/SO/SSOP

MAX158



REF

GND

INT

__________________________________________________________Pin Configurations

19-0892; Rev 3; 12/96

PART

MAX154ACNG

MAX154BCNG

MAX154BC/D 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

24 Narrow

Plastic DIP

24 Narrow

Plastic DIP

Dice

MAX154ACWG

MAX154BCWG

MAX154ACAG 0°C to +70°C

0°C to +70°C

0°C to +70°C 24 Wide SO

24 Wide SO

24 SSOP

Ordering Information continued at end of data sheet.

ERROR

(LSB)

±1

MAX154BCAG 0°C to +70°C 24 SSOP ±1

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Summary of content (12 pages)

PAGE 1
9-0892; Rev 3; 12/96 CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference The MAX154/MAX158 are high-speed multi-channel analog-to-digital converters (ADCs). The MAX154 has four analog input channels while the MAX158 has eight channels. Conversion time for both devices is 2.5µs. The MAX154/MAX158 also feature a 2.5V on-chip reference, forming a complete high-speed data acquisition system. Both converters include a built-in track/hold, eliminating the need for an external track/hold.
PAGE 2
MAX154/MAX158 CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD to GND.........................................0V, +10V Voltage at Any Other Pins........................GND -0.3V, VDD +0.3V Output Current (REF OUT)..................................................30mA Power Dissipation (any package) to +75°C ....................450mW Derate above +25°C by ..............................................6mW/°C Operating Temperature Ranges MAX15_ _C_ _.....
PAGE 3
CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference (VDD = +5V, VREF+ = +5V, VREF- = GND, MODE 0, TA = TMIN to TMAX, unless otherwise noted). PARAMETER SYMBOL CONDITIONS MIN DB0-DB7, INT; IOUT = -360µA 4.0 TYP MAX UNITS LOGIC OUTPUTS Output High Voltage Output Low Voltage VOH VOL Three-State Output Current Output Capacitance (Note 4) DB0-DB7, INT; RDY V IOUT = 1.6mA 0.4 IOUT = 2.6mA 0.
PAGE 4
__________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) OUTPUT CURRENT vs. TEMPERATURE VDD = 5V 2.500 2.490 VDD = 5V VREF = 5V LINEARITY ERROR (LSB) 16 OUTPUT CURRENT (mA) 2.510 2.0 MX7824/28-2 20 MX7824/28-1 2.520 ACCURACY vs. DELAY BETWEEN CONVERSIONS (tp) ISOURCE VOUT = 2.4V 12 8 ISINK VOUT = 0.4V 4 1.5 1.0 0.5 0 2.
PAGE 5
CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference PIN MAX154 NAME FUNCTION PIN MAX158 NAME FUNCTION 1 AIN4 Analog Input Channel 4 1 AIN6 Analog Input Channel 6 2 AIN3 Analog Input Channel 3 2 AIN5 Analog Input Channel 5 AIN4 Analog Input Channel 4 3 AIN2 Analog Input Channel 2 3 4 AIN1 Analog Input Channel 1 4 AIN3 Analog Input Channel 3 5 AIN2 Analog Input Channel 2 6 AIN1 Analog Input Channel 1 7 REF OUT 8 DB0 Three-State Data Output, bit 0 (LSB) 9 DB1 Th
PAGE 6
MAX154/MAX158 CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference _______________Detailed Description ___________________Digital Interface Converter Operations The MAX154/MAX158 use only Chip Select (CS) and Read (RD) as control inputs. A READ operation, taking CS and RD low, latches the multiplexer address inputs and starts a conversion (Table 1). The MAX154/MAX158 use what is commonly called a "half-flash" conversion technique (Figure 3).
PAGE 7
CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference 500ns 1000ns SETUP TIME REQUIRED BY THE INTERNAL COMPARATORS PRIOR TO STARTING CONVERSION 600ns VIN IS SAMPLED AND THE FOUR MSBs ARE LATCHED Interface Mode 1 VIN IS TRACKED BY INTERNAL COMPARATORS Figure 4. Operating Sequence Interface Mode 0 Figure 5 shows the timing diagram for Mode 0 operation. This is used with microprocessors that have WAIT state capability, whereby a READ instruction is extended to accommodate slow-memory devices.
PAGE 8
MAX154/MAX158 CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference CS tRD tCSS tCSH tCSS tCSH tRD RD tP tAS tAS ANALOG CHANNEL ADDRESS ADDR VALID ADDR VALID tAH tAH RDY tRDY tRDY tCRD tINTH INT tACCI tINTH tDH tDH tACCI OLD DATA DATA NEW DATA Figure 6. Mode 1 Timing Diagram _____________Analog Considerations Reference and Input The VREF+ and VREF- inputs of the converter define the zero and the full-scale of the ADC.
PAGE 9
CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference AINx(+) VIN AINx(-) GND MAX154 MAX158 VDD +5V REFOUT 0.1µF 47µF VREF+ 0.01µF VREF- Figure 8a. Internal Reference AINx(+) VIN AINx(-) GND VDD +5V 0.1µF MAX154 MAX158 VREF- Figure 8b. Power Supply as Reference * Current path must still exist from VIN(-) to Ground Sinusoidal Inputs AINx(+) VIN GND VDD +5V 0.
PAGE 10
MAX154/MAX158 CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference Bipolar Input Operation The circuit in Figure 10a can be used for bipolar input operation. The input voltage is scaled by an amplifier so that only positive voltages appear at the ADC’s inputs. The analog input range is ±4V and the output code is complementary offset binary. The ideal input/output characteristic is shown in Figure 10b.
PAGE 11
CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference +5V 26 PART VDD BANDPASS FILTER 1 6 BANDPASS FILTER 2 MAX154AENG -40°C to +85°C AIN1 CS 18 RD 12 BANDPASS FILTER 8 ±1/2 MAX154BEWG -40°C to +85°C MAX154AEAG -40°C to +85°C MAX154BEAG -40°C to +85°C 24 Wide SO 24 SSOP 24 SSOP ±1 ±1/2 ±1 23 MAX154AMRG -55°C to +125°C MAX154BMRG -55°C to +125°C MAX158ACPI 0°C to +70°C 0°C to +70°C MAX158BCPI MAX158BC/D 0°C to +70°C 24 CERDIP 24 CERDIP 28 Plastic DIP 28 Plastic DIP Dice ±1/2 ±1 ±1/2 ±1
PAGE 12
MAX154/MAX158 CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference ___________________Chip Topography AIN4 AIN6 AIN8 (N.C.) (AIN2) (AIN4) AIN3 AIN5 AIN7 (N.C.) (AIN1) (AIN3) VDD A0 A1 A2 (N.C.) AIN2 (N.C.) AIN1 (N.C.) TP (REF OUT) 0.127" (3.228mm) DB7 DB0 DB6 DB1 DB5 DB2 DB4 DB3 CS A0 GND VREF+ INT VREF- ADY 0.124" (3.