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1、1Linear Technology Chronicle November 1997A Showcase of Linear Technologys Focus ProductsLinear Technology ChronicleNovember 1997Vol. 6 No. 11Product of the MonthSerial 16-bit Multiplying DACs Upgrade Industry Standard 12-Bit DACsThe LTC1595/LTC1596 are serial input, 16-bit multiplying current outpu
2、t DACs pin compatible with industry standard 12-bit devices. The LTC1595/LTC1596 offer guaranteed 16-bit accuracy over theindustrial temperature range. DNL and INL are tested to be less than 1LSB over tem- peratureensuring a 16-bit monotonic response. They include an internal deglitch- ing circuit t
3、hat provides the industrys lowest glitch impulse: 1nVs (typ). The LTC1595 is pin compatible with the 12-bit industry stan- dard 8043 and is offered in 8-pin PDIP and SO packages. The LTC1596 is drop-in com- patible with the 8143 or 7543 and comes in 16-pin PDIP and SO wide packages. Most application
4、s with multiplying DACs require an external op amp which also influences system accuracy. The LTC1595/LTC1596 have reduced sensitivity to op amp VOS which allows most systems to be easily upgraded to true 16-bit linearity without requiring more precise op amps. Figure 1 shows the INL performance of
5、the LTC1595. The LTC1595/LTC1596 are ideal for indus-trial control, instrumentation, ATE and other high resolution applications.The LTC1595/LTC1596 have a 3-wire serial interface (LTC1595) or a full-duplex serial interface with strobe and clear inputs (LTC1596). The LTC1596 has a daisy-chain output
6、that allows multiple DACs to be con- nected on the same serial port minimizing data I/O pins (see Figure 2). The asynchro- nous clear pin (CLR) allows the user to quickly reset the output to zero-scale with- out writing data to the input.The LTC1595 is offered in 8-lead PDIP and SO packages and the
7、LTC1596 is offered in 16-lead PDIP and SO packages. Parts are screened to A, B and C electrical grades over the commercial and industrial temperature ranges and delivery is from stock. Contact your local Linear Technology sales office for a data sheet and evaluation samples. For more information, vi
8、sit our web site at www.linear-.DIGITAL INPUT CODE00.5INTEGRAL NONLINEARITY (LSB)0.30.40.20.20.30.40.50.10.1016384327681595/96 TA024915265535Dual 12-bit Micropower DAC in SO-8 Has Max DNL Error of 0.5LSBThe LTC1448 is a dual 12-bit DAC in an SO-8 package that operates from a single 2.7V to 5V supply
9、 with maximum differen- tial nonlinearity (DNL) of just 0.5LSB. Its unity-gain configuration allows the refer- ence input to be tied directly to VCC for true rail-to-rail output swing. This dual DAC (Figure 1) consumes only 3.5mW maximum from a 5V supply. Power-on reset ensures that it will start in
10、 a known (zero-scale) state after power-up. These features make it well- suited for portable and battery-powered equipment, for general trimming and digital calibration applications and in industrial control systems and cellular phones.The LTC1448 includes two 12-bit D/A converters, two rail-to-rail
11、 voltage output amplifiers and a 3-wire serial interface. Its DNL of 0.5LSB (Figure 2) guarantees 12-bitFigure 1. LTC1595 Has Typical INL of 0.2LSB and Specified Max INL of 1LSB, LTC and LT are registered trademarks of Linear Technology Corp. Pentium is a registered trademark of Intel Corp.Continued
12、 on page 2Inside This Issue: LTC1514/LTC1515: Step-Up/Step-Down Charge Pump Provides 5V from 3V to 10V Input .2 LT1635: A 1A Shunt Battery Charger .3 LTC1517-5: Regulated 5V/20mA Charge Pump in SOT-23 Draws Just 6A IQ. 3 LTC1522: Regulated 5V Charge Pump in MSOP Operates on 6A. 4 LT1573: Pentium Pro
13、cessor Regulator Controller Delivers Low Cost, Low Dropout Solution .4Figure 2. The 16-Pin LTC1596 Has Additional Pins for Flexibility (Compared to LTC1595), Four Clock Pins, Two Load Pins and a Data Output Pin for Daisy-Chaining Multiple DACsVDDVREFLTC1596RFBAGNDDGND31210? 4? 7? 5? 6? 9? 8? 1121413
14、5VVREF? 10V TO 10VTO NEXT DAC? FOR DAISY-CHAINING15161OUT133pF0.1FVOUT? 0V TO VREF1595/96 F01aOUT2+LT1001CLRSTB3? STB1? SRI? LD1? SRO ? LD2? STB2? STB4P2Linear Technology Chronicle November 1997Step-Up/Step-Down Charge Pump Provides 5V from 3V to 10V Input5V. Up to 50mA of output current is avail- a
15、ble from all of these converters. Figure 2 shows the output voltage vs input voltage for the LTC1515.The LTC1514/LTC1515 are available in an SO-8 package and are screened to the commercial and industrial temperature ranges. For a data sheet and evaluation samples, contact your local Linear Technology sales office or visit our web site at www.linear- for more information.Figure 1. LTC1448 Dual DAC Includes a Rail-to-Rail Output Buffer Amplifier and an Easy-to-Use 3-Wire Serial Interface+1
