HomedatasheetCAT515PITE13

CAT515PITE13 Datasheet

8-bit Quad Digital POT with Independent Reference Inputs
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Description

Features, Applications
8-Bit Quad Digital POT with Independent Reference Inputs FEATURES

s Output settings retained without power s Independent Reference Inputs s Output range includes both supply rails s Programming voltage generated on-chip s 4 independently addressable outputs s Serial �P interface s Single supply operation: 2.7V-5.5V

APPLICATIONS

s Automated product calibration. s Remote control adjustment of equipment s Offset, gain and zero adjustments in Self-

DESCRIPTION

The is a quad 8-Bit Memory DAC designed as an electronic replacement for mechanical potentiometers and trim pots. Intended for final calibration of products such as camcorders, fax machines and cellular telephones on automated high volume production lines and systems capable of self calibration, it is also well suited for applications were equipment requiring periodic adjustment is either difficult to access or located in a hazardous environment. The CAT515 offers 4 independently programmable DACs each having its own reference inputs and each capable of rail to rail output swing. Output settings, stored nonvolatile EEPROM memory, are not lost when the device is powered down and are automatically reinstated when power is returned. Each output can be dithered to test new output values without effecting the stored settings and stored settings can be read back without disturbing the DAC's output. FUNCTIONAL DIAGRAM

Control of the CAT515 is accomplished with a simple 3 wire serial interface. A Chip Select pin allows several CAT515's to share a common serial interface and communications back to the host controller is via a single serial data line thanks to the CAT515's Tri-Stated Data Output pin. A RDY/BSYoutput working in concert with an internal low voltage detector signals proper operation of EEPROM Erase/Write cycle. The CAT515 operates from a single 3�5 volt power supply. The high voltage required for EEPROM Erase/ Write operations is generated on-chip. The CAT515 is available in the to 70�C Commercial and to +85�C Industrial operating temperature ranges and offered in 20-pin plastic DIP and Surface mount packages.

VREF H3 VREF H4 VREF H4 V REF VOUT3 VOUT4 VREF L4 V REF L3 L2 DVD CLK RDY/BSY DI DO PROG GND
2000 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice

ABSOLUTE MAXIMUM RATINGS Supply Voltage* VDD to GND...................................... to +7V Inputs CLK to GND............................ �0.5V to VDD CS to GND.............................. �0.5V to VDD DI to GND............................... �0.5V to VDD +0.5V RDY/BSY to GND................... �0.5V to VDD +0.5V PROG to GND........................ �0.5V to VDD +0.5V VREFH to GND........................ �0.5V to VDD +0.5V VREFL to GND......................... �0.5V to VDD +0.5V Outputs D0 to GND............................... �0.5V to VDD +0.5V VOUT 4 to GND................... �0.5V to VDD +0.5V Operating Ambient Temperature Commercial (`C' suffix).................... to +70�C Industrial (`I' suffix)...................... to +85�C Junction Temperature..................................... +150�C Storage Temperature....................... to +150�C Lead Soldering (10 sec max).......................... +300�C

* Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Absolute Maximum Ratings are limited values applied individually while other parameters are within specified operating conditions, and functional operation at any of these conditions is NOT implied. Device performance and reliability may be impaired by exposure to absolute rating conditions for extended periods of time.

1. This parameter is tested initially and after a design or process change that affects the parameter. 2. Latch-up protection is provided for stresses 100mA on address and data pins from �1V to VCC + 1V.

DC ELECTRICAL CHARACTERISTICS: VDD to +5.5V, VREFH = VDD, VREFL = 0V, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units

Resolution 8 ILOAD = 250 nA, = I ILOAD = 1 �A, = I ILOAD = 250 nA, = I ILOAD = 1 �A, = I VIN = VDD VIN 0 2.7 GND IOH 40 �A IOL = 1 mA, VDD = +5V IOL = 0.4 mA, VDD VDD�0.3 28K VDD 0.8 VDD Bits LSB �A

IIH IIL VIH VIL Input Leakage Current Input Leakage Current High Level Input Voltage Low Level Input Voltage VREFH Input Voltage Range VREFL Input Voltage Range VREFH�VREFL Resistance Input Resistance Match High Level Output Voltage Low Level Output Voltage

DC ELECTRICAL CHARACTERISTICS (Cont.): VDD to +5.5V, VREFH = VDD, VREFL = 0V, unless otherwise specified Symbol

Full-Scale Output Voltage Zero-Scale Output Voltage DAC Output Load Current DAC Output Impedance Power Supply Rejection VOUT Temperature Coefficient Temperature Coefficient of VREF Resistance Supply Current (Read) Supply Current (Write) Operating Voltage Range

VR = VREFH � VREFL VR = VREFH � VREFL VDD = VREFH = +5V VDD = VREFH = +3V ILOAD 1 �A VDD = +5V, ILOAD = 250nA VREFH= +5V, VREFL = 0V VREFH to VREFL

AC ELECTRICAL CHARACTERISTICS: VDD to +5.5V, VREFH = VDD, VREFL = 0V, unless otherwise specified Symbol Digital

tCSMIN tCSS tCSH tDIS tDIH tDO1 tDO0 tHZ tLZ tBUSY tPS tPROG tCLKH tCLKL fC Minimum CS Low Time CS Setup Time CS Hold Time DI Setup Time DI Hold Time Output Delay to 1 Output Delay to 0 Output Delay to High-Z Output Delay to Low-Z Erase/Write Cycle Time PROG Setup Time Minimum Pulse Width Minimum CLK High Time Minimum CLK Low Time Clock Frequency DAC Settling Time to 1 LSB ms ns MHz �s pF pFNotes

Notes: 1. All timing measurements are defined at the point of signal crossing VDD / 2. These parameters are periodically sampled and are not 100% tested.


Features

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