HomedatasheetCAT504

CAT504 Datasheet

8-bit Quad DAC Pot
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Description

Features, Applications
FEATURES

s Output settings retained without power s Output range includes both supply rails s 4 independently addressable outputs s 1 LSB Accuracy s Serial �P interface s Single supply operation: 2.7V-5.5V s Setting read-back without effecting outputs

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, it is also well suited for systems capable of self calibration, and applications where equipment which is either difficult to access in a hazardous environment, requires periodic adjustment. The 4 independently programmable DAC's have an output range which includes both supply rails. Output settings, stored in non-volatile 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 CAT504 is accomplished with a simple 3 wire serial interface. A Chip Select pin allows several CAT504s to share a common serial interface and communication back to the host controller is via a single serial data line thanks to the CAT504's Tri-Stated Data Output pin. The CAT504 operates from a single 3�5 volt power supply drawing just a few milliwatts of power. When storing data in EEPROM memory an additional 20 volt low current supply is required. The CAT504 is available in the 70� C Commercial and 85� C Industrial operating temperature ranges and offered in 14-pin plastic DIP and Surface mount packages.

1998 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice

ABSOLUTE MAXIMUM RATINGS* Supply Voltage VDD to GND...................................... to +7V VPP to GND..................................... to +22V Inputs CLK to GND............................ �0.5V to VDD CS to GND.............................. �0.5V to VDD DI 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 RELIABILITY CHARACTERISTICS Symbol

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.

NOTES: 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 Accuracy

INL Integral Linearity Error ILOAD = 250 nA, = I ILOAD = 1 �A, = I ILOAD = 250 nA, = I ILOAD = 1 �A, = I LSB

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 High Level Output Voltage Low Level Output Voltage IOH 40 �A IOL = 1 mA, VDD = +5V IOL = 0.4 mA, VDD = +3V VIN = VDD VIN 0 2.7 GND VDD 10 �10 VDD 0.8 VDD 0.4 �A

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 Programming Current Operating Voltage Range Programing Voltage Range

VR = VREFH�VREFL VR = VREFH�VREFL VDD = +5V VDD = +3V ILOAD 250 nA VREFH = +5V, VREFL = 0V VDD = +5V, ILOAD = 250nA 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 tPROG tPS 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 Pulse Width PROG Setup Time Minimum CLK High Time Minimum CLK Low Time Clock Frequency DAC Settling Time to 1/2 LSB ms ns MHz �s pF

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

Parameters

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