Document
19-0876; Rev 1; 5/96
CMOS, µP-Compatible, 5µs/10µs, 8-Bit ADCs
_______________General Description
Maxim’s MX7575/MX7576 are high-speed (5µs/10µs), microprocessor (µP) compatible, 8-bit analog-to-digital converters (ADCs). The MX7575 provides an on-chip track/hold function that allows full-scale signals up to 50kHz (386mV/µs slew rate) to be acquired and digitized accurately. Both ADCs use a successive-approximation technique to achieve their fast conversions and low power dissipation. The MX7575/MX7576 operate with a +5V supply and a 1.23V external reference. They accept input voltages ranging from 0V to 2VREF. The MX7575/MX7576 are easily interfaced to all popular 8-bit µPs through standard CS and RD control signals. These signals control conversion start and data access. A BUSY signal indicates the beginning and end of a conversion. Since all the data outputs are latched and three-state buffered, the MX7575/MX7576 can be directly tied to a µP data bus or system l/O port. Maxim also makes the MAX165, a plug-in replacement for the MX7575 with an internal 1.23V reference. For applications that require a differential analog input and an internal reference, the MAX166 is recommended.
____________________________Features
o Fast Conversion Time: 5µs (MX7575) 10µs (MX7576)
MX7575/MX7576
o Built-In Track/Hold Function (MX7575) o Low Total Unadjusted Error (±1LSB max) o 50kHz Full-Power Signal Bandwidth (MX7575) o Single +5V Supply Operation o 8-Bit µP Interface o 100ns Data-Access Time o Low Power: 15mW o Small-Footprint Packages
______________Ordering Information
PART MX7575JN TEMP. RANGE 0°C to +70°C PIN-PACKAGE 18 Plastic DIP INL (LSB) ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1 ±1/2
________________________Applications
Digital Signal Processing High-Speed Data Acquisition Telecommunications Audio Systems High-Speed Servo Loops Low-Power Data Loggers
MX7575KN 0°C to +70°C 18 Plastic DIP MX7575JCWN 0°C to +70°C 18 Wide SO MX7575KCWN 0°C to +70°C 18 Wide SO MX7575JP 0°C to +70°C 20 PLCC MX7575KP 0°C to +70°C 20 PLCC MX7575J/D 0°C to +70°C Dice* MX7575AQ -25°C to +85°C 18 CERDIP** MX7575BQ -25°C to +85°C 18 CERDIP** Ordering Information continued at end of data sheet. * Contact factory for dice specifications. ** Contact factory for availability.
_________________Pin Configurations
TOP VIEW
CS 1 RD 2 TP (MODE) 3 BUSY 4 CLK 5 D7 (MSB) 6 D6 7 D5 8 18 VDD 17 REF
_______________Functional Diagrams
VDD 18 16
MX7575
AIN
MX7575 MX7576
TRACK/ HOLD
COMP
16 AIN 15 AGND 14 D0 (LSB) 13 D1 12 D2 11 D3 10 D4
AGND 15 REF 17 CLK 5 CLOCK OSCILLATOR DAC
SAR 6 LATCH AND THREE-STATE OUTPUT DRIVERS 14 9 DGND D7 D0
DGND 9
CS RD TP
1 2 3
CONTROL LOGIC
. .
( ) ARE FOR MX7576 ONLY.
DIP/SO
Pin Configurations continued at end of data sheet.
4 BUSY Functional Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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CMOS, µP-Compatible, 5µs/10µs, 8-Bit ADCs MX7575/MX7576
ABSOLUTE MAXIMUM RATINGS
VDD to AGND...............................................................-0.3V, +7V VDD to DGND ..............................................................-0.3V, +7V AGND to DGND ...............................................-0.3V, VDD + 0.3V Digital Input Voltage to DGND (CS, RD, TP, MODE) ......................................-0.3V, VDD + 0.3V Digital Output Voltage to DGND (BUSY, D0–D7) ..............................................-0.3V, VDD + 0.3V CLK Input Voltage to DGND ............................-0.3V, VDD + 0.3V REF to AGND ...................................................-0.3V, VDD + 0.3V AIN to AGND....................................................-0.3V, VDD + 0.3V Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 11.11mW/°C above +70°C) ...............889mW Wide SO (derate 9.52mW/°C above +70°C)..................762mW CERDIP (derate 10.53mW/°C above +70°C) .................842mW PLCC (derate 10.00mW/°C above +70°C) ....................800mW Operating Temperature Ranges MX757_J/K ............................................................0°C to +70°C MX757_A/B ........................................................-25°C to +85°C MX757_JE/KE ....................................................-40°C to +85°C MX757_S/T.......................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering,10sec) ..............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERI.