DEMO MANUAL DC1774A-A LTC6430-15 100MHZ to 300MHZ Differential ADC Driver/IF Amplifier Description Demonstration circuit 1774A-A is a differential ADC driver/IF amplifier featuring the LTC(R)6430-15. It is part of the DC1774A demo board family supporting the LTC643X-YY amplifier series. The DC1774A-A is optimized for a frequency range of 100MHz to 300MHz and utilizes a minimum of passive external components to configure the amplifier for this application. Performance Summary SYMBOL Because the LTC6430-15 has 100 differential input and output impedance, the demo circuit uses transformers to convert the impedance to 50 single-ended allowing easy evaluation with commercially available RF test equipment. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25C, VCC = 5V PARAMETER CONDITIONS VALUE / UNIT VCC Operating Supply Range All VCC Pins Plus OUT Pins ICC Current Consumption Total Current Power Supply (MHz) Power Gain | S21 | (dB) 50 Frequency Output Output Third-Order Third-Order Intercept Point1 Intermodulation1 4.75V to 5.25V 160mA Second Harmonic Distortion 2 Third Harmonic Distortion 2 Output 1dB Compression Point Noise Figure 3 OIP3 (dBm) OIM3 (dBc) HD2 (dBc) HD3 (dBc) P1dB (dBm) NF (dB) 13.1 47.1 -90.2 -83.3 -93.1 21.8 5.2 100 14.5 47.3 -90.5 -84.6 -95.3 22.6 4.1 200 14.5 47.2 -90.3 22.2 4.0 14.2 50.0 -96.0 -86.6 -83.8 (4) -90.9 240 -85.2 (4) 22.2 4.1 300 13.6 47.0 -90.0 -73.6 (4) -83.4 (4) 22.0 4.4 -88.8 -56.1 (4) -85.0 (4) 21.3 5.1 400 12.2 46.4 All figures are referenced to J7 (input port) and J8 (output port). Note 1: Two-tone test condition: Output power level = 2dBm/tone; tone spacing = 1MHz. Note 2: Single-tone test condition: Output power level = 8dBm. Note 3: Small signal noise figure. Note 4: Performance degraded due to transformers' being out of working frequency range. dc1774aaf 1 DEMO MANUAL DC1774A-A Block Diagram GND 8, 14, 17, 23 AND PADDLE 25 VCC 9, 22 BIAS AND TEMPERATURE COMPENSATION 24 +IN +OUT T_DIODE 7 -IN -OUT 18 16 13 GND 8, 14, 17, 23 AND PADDLE 25 dc1774aa F01 Figure 1. LTC6430-15 Device Block Diagram Operation NOMINAL WORKING FREQUENCY RANGE 18 0 16 14 |S21| (dB) -4 |S21| -8 |S11| 12 -12 |S22| 10 -16 |S12| 8 -20 6 4 |S11,|S12|,|S22| (dB) Demo Circuit 1774A-A is a highly linear fixed-gain amplifier. The LTC6430-15 is internally matched to a 100 differential source and load impedance from 20MHz to 1300MHz. Due to the unpopularity of 100 differential test equipment, transformers have been added to convert impedance from differential 100 to single-ended 50 for the input and the output ports. The frequency range of the circuit is limited by the balun transformers. Hence, this demo board works best with a frequency range from 100MHz to 300MHz. Figure2 shows the performance of the demo board. -24 0 100 200 FREQUENCY (MHz) 300 -28 400 dc1774aa F02 Figure 2. Demo Board DC1774A-A S-Parameters dc1774aaf 2 DEMO MANUAL DC1774A-A Operation Figure 3 shows the simplified demo circuit schematic. It requires a minimum of passive supporting components. The 2:1 transformers convert the differential to singleended 50 for compatibility with most test equipment. The input and output DC-blocking capacitors (C1, C2, C3 and C4) are required because this device is internally biased for optimal operation. The frequency appropriate choke (L1 and L2) and the decoupling capacitors (C5, C21, C22 and C23) provide bias to the RF OUT nodes. Only a single 5V supply is necessary for VCC pins on the device. Table 1 shows the function of each input and output on the board. An optional input stability network has been added. It consists of a parallel 62pF (C8 and C9) and 348 (R1 and R2) input network to insure low frequency stability. Table 1. DC1774A-A Board I/O Descriptions CONNECTOR FUNCTION J7 (+IN) Single-Ended Input. Impedance-matched to 50. Drive from a 50 network analyzer or signal source. J8 (-OUT) Single-Ended Output. Impedance-matched to 50. Drive from a 50 network analyzer or spectrum analyzer. E3 or J11 (VCC) Positive Supply Voltage Source. E6 or J18 (GND) Negative Supply Ground. Stability Network VCC C7 1000pF C8 62pF 0603 C2 1000pF 20 21 22 23 19 DNC DNC DNC VCC 24 +IN GND DNC C9 62pF DNC U1 = LTC6430-15 DNC -OUT C22 0.1uF C3 1000pF 18 Stability Network T4 = ADT2-1T+ 4 17 16 C15 1000pF R19 15 14 OPT C4 1000pF 13 3 5 6 J8 1 -OUT SMA L2 560nH VCC C23 0.1uF J18 E6 R4 0 0603 J11 +5V R1 348 VCC GND C21 1000pF 12 R3 0 DNC DNC DNC 6 T_DIODE DNC 11 4 DNC 10 5 GND VCC 4 +OUT DNC 9 3 GND C14 1000pF L1 560nH U1 DNC -IN 5 2 8 SMA 3 1 6 7 1 GND GND T3 = ADT2-1T+ J7 +IN VCC R2 348 25 C1 1000pF C5 1000pF E3 +5V C20 1000pF GND Figure 3. Simplified Demo Board DC1774A-A Schematic dc1774aaf 3 DEMO MANUAL DC1774A-A Operation Additional Information prevent solder from wicking away from the critical PCB to the exposed pad interface. The particular element values shown in the demo board schematic are chosen for wide bandwidth operation. Depending on the desired frequency, performance may be improved by the proper selection of these supporting components. The DC1774A-A has a nominal working frequency range from 100MHz to 300MHz. It is not intended for operation down to DC. The lower frequency cutoff is limited by onchip matching elements. As with any RF device, minimizing ground inductance is critical. Care should be taken with the board layout because of these exposed pad packages. The maximum number of minimum diameter vias holes should be placed underneath the exposed pad. This will ensure good RF ground and low thermal impedance. Maximizing the copper ground plane will also improve heat spreading and low inductance. It is a good idea to cover the via holes with solder mask on the back side of the PCB to Figure 6 shows the generic PCB schematic for the LTC643X-YY amplifier series. The board can be modified for multiple demo board versions. For example, both DC1774A-A and DC1774A-B demo boards have a differential amplifier at U1, therefore, the board is using transformers to transform from differential to singleended input and output. Likewise, the DC1774A-C is a single-ended demo board; it uses the LTC6431-15 for single-ended input and output. Setup and Testing Signal Sources The LTC6430-15 is an amplifier with high linearity performance, therefore output intermodulation products are very low. For this reason, it drives most test equipment and test setups to their limits. Consequently, accurate measurement of the third-order intercept point for a low distortion IC such as the LTC6430-15 requires certain precautions to be observed in the test setup and testing procedure. Setup signal sources Figure 5 shows a proposed IP3 test setup. This setup has low phase noise, good reverse isolation, high dynamic range, sufficient harmonic filtering and wideband impedance matching. The setup is outlined here: a. High performance signal generators 1 and 2 (HP8644A) should be used in the setup. These suggested generators have low harmonic distortion and very low phase noise. b. High linearity amplifiers to improve isolation. They prevent the two signal generators from crosstalking with each other and provide higher output power. c. A lowpass filter to suppress harmonic contents from interfering with the test signal. d. The signal combiner (from Mini-Circuits, ADP-2-9) combines the two isolated input signals. This combiner has a typical isolation of 27dB. For better VSWR and isolation, use the H-9 signal combiner from M/A-COM, which features >40dB isolation and a wider frequency range. Passive devices (e.g., combiners) with magnetic elements can contribute nonlinearity to the signal chain and should be used cautiously. e. The attenuator pads, on all three ports of the signal combiner, will support further isolation of the two input signal sources. They will reduce reflection and promote maximum power transfer with wideband impedance matching. dc1774aaf 4 DEMO MANUAL DC1774A-A Setup and Testing Signal Sources Testing signal sources a. Apply two independent signals, f1 and f2, from signal generator 1 and signal generator 2 at 240MHz and 241MHz while setting amplitude = -12dBm per tone at the combined output. d. In order to achieve a valid measurement result, the test system must have lower distortion than the DUT intermodulation. For example, to measure a 47dBm OIP3, the measured intermodulation products will be -90dBc below the -12dBm per tone input level and the test system must have intermodulation products approximately -96dBc or better. For best results, the IMD or noise floor should be at least -100dBc before connecting the DUT. b. Connect the combined signal directly to the spectrum analyzer (without the DUT). Testing the DUT The testing signal should be evaluated and optimized before it is used for measurements. The following outlines the necessary steps to achieve optimization: c. Adjust the spectrum analyzer for the maximum possible resolution of the intermodulation products amplitude in dBc relative to the main tone power. A narrower resolution bandwidth will take a longer time to sweep. Optimize the dynamic range of the spectrum analyzer by adjusting input attenuation. First increase the spectrum analyzer input attenuation (normally in steps of 5dB or 10dB). If the IMD product levels decrease when the input attenuation is increased, then the input power level was too high for the spectrum analyzer to make a valid measurement. In other words, the spectrum analyzer 1st mixer was overloaded and producing its own IMD products. If the IMD reading holds constant with increased input attenuation, then a sufficient amount of attenuation was present. Adding too much attenuation will raise the noise floor and bury the intended IMD signal. Therefore, select just enough attenuation to achieve a stable and valid measurement. At this point, the input level has been established at -12dBm per tone, and the input IMD from the test setup is well suppressed at -96dBm max. Furthermore, the spectrum analyzer is set up to measure very low level IMD components. a. Insert the DUT and output attenuator into the setup, inline between the signal source and the spectrum analyzer. The output attenuator should match the DUT gain. b. Fine tune the signal generator levels by a small amount if necessary (<1dB), to keep output power at 2dBm per tone at the amplifier output. c. Measure the output IMD level using the same optimized setup as previous. Based on the output power level of 2dBm per tone, and knowing the IMD level, OIP3 can be calculated. dc1774aaf 5 DEMO MANUAL DC1774A-A Quick Start Procedure Demo Circuit 1774A-A can be set up to evaluate the performance of the LTC6430-15. Refer to Figures 4 and 5 for proper equipment connections and follow this procedure: Single-Tone Measurement: 1. The power labels of +5V and GND directly correspond to the power supply. Typical current consumption of the LTC6430-15 is about 160mA. 2. Apply an input signal to J7. A low distortion, low noise signal source with an external high order lowpass filter will yield the best performance. The input signal is -10dBm. The input is impedance-matched to 50 . 3. Observe the output via J8. The measured power at the analyzer should be about 4dBm. The output is impedance-matched to 50, suitable for the input of a network or spectrum analyzer. Two-Tone Measurement: Connect all test equipment as suggested in Figure 8. 1. The power labels of +5V and GND directly correspond to the power supply. Typical current consumption of the LTC6430-15 is about 160mA. 2. Apply two independent signals, f1 and f2, from SG1 and SG2, at 240MHz and 241MHz, respectively. ASSY U1 FREQUENCY (MHz) -A LTC6430AIUF-15 100 TO 300 -B LTC6430AIUF-15 400 TO 1000 -C LTC6431AIUF-15 100 TO 1200 DC POWER SUPPLY GND V+ VCC = 4.75V TO 5.25V SIGNAL GENERATOR (HP8644A) LOWPASS FILTER (OPTIONAL) 3dB ATTENUATION PAD (OPTIONAL) SPECTRUM ANALYZER dc1774aa F04 COAXIAL CABLE ROHDE AND SCHWARZ FSEM30 Figure 4. Proper Equipment Setup for Gain and Single-Tone Measurement dc1774aaf 6 DEMO MANUAL DC1774A-A Quick Start Procedure 3. Monitor the output tone level on the spectrum analyzer. Adjust signal generator levels such that the output power measures 2dBm/tone at the amplifier output, J8, after correcting for external cable losses and attenuations. 4. Change the spectrum analyzer's center frequency and observe the two IM3 tones at 1MHz below and above SIGNAL GENERATOR 1 (HP8644A) AMPLIFIER MINI-CIRCUITS, ZHL-2, OR EQUIVALENT the input frequencies. The frequencies of IM3_LOW and IM3_HIGH are 239MHz and 242MHz, respectively. For this setup, the Rohde and Schwarz FSEM30 spectrum analyzer was used. This spectrum analyzer has a typical 20dBm third-order intercept point (TOI). The Rohde and Schwarz FSU can also be used. The system, as described, can measure OIP3 up to 50dBm. FREQUENCY (MHz) ASSY U1 -A LTC6430AIUF-15 100 TO 300 -B LTC6430AIUF-15 400 TO 1000 -C LTC6431AIUF-15 100 TO 1200 DC POWER SUPPLY GND V+ VCC = 4.75V TO 5.25V LOWPASS FILTER 6dB ATTENUATION PAD (OPTIONAL) 3dB ATTENUATION PAD COMBINER MINI-CIRCUITS ADP-2-9 14dB ATTENUATION PAD (MATCHES DUT GAIN) APPROX. -12dBm/TONE SPECTRUM ANALYZER 6dB ATTENUATION PAD (OPTIONAL) 2dBm/TONE LOWPASS FILTER dc1774aa F05 COAXIAL CABLE ROHDE AND SCHWARZ FSEM30 DUT GAIN APPROXIMATELY 14dB AMPLIFIER MINI-CIRCUITS, ZHL-2, OR EQUIVALENT SIGNAL GENERATOR 2 (HP8644A) Figure 5. Proper Equipment Setup for IP3 Measurement dc1774aaf 7 DEMO MANUAL DC1774A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1774A-2 Required Circuit Components 1 4 C1, C3, C7, C20 CAP., X7R, 1000pF, 50V, 5%, 0402 AVX, 04025C102JAT2A 2 1 C21 CAP., X7R, 1000pF, 50V, 5%, 0603 AVX, 06035C102JAT2A 3 1 C8 CAP., COG, 62pF, 16V, 2%, 0402 AVX, 0402YA620GAT2A 4 0 C10, C12 CAP., COG, 62pF, 16V, 2%, 0402 OPT 5 0 C11, C13, C16-C19 CAP., X7R, 1000pF, 5%, 0402 OPT 6 1 C22 CAP., X5R, 0.1F, 10V, 10%, 0603 AVX, 0603ZD104KAT2A 7 2 E3, E6 TESTPOINT, TURRET, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0 8 0 JP1 HEADER, 2x6, 0.1" OPT 9 0 JP2, JP3 HEADER, 2x4, 0.1" OPT 10 0 J5, J6 CONN., SMA 50 EDGE-MOUNTED OPT 11 1 J7 CONN., SMA 50 EDGE-MOUNTED JOHNSON, 142-0701-851 12 0 J9 CONN., SMA 50 EDGE-MOUNTED OPT 13 2 J11, J18 JACK, BANANA KEYSTONE, 575-4 14 1 L1 INDUCTOR, CHIP, 560nH, 5%, 0603LS-1608 COILCRAFT, 0603LS-561XJLB 15 0 L11, L22 INDUCTOR, CHIP, 1008LS-2520 OPT 16 1 R2 RES., CHIP, 348, 1%, 0402 YAGEO, RC0402FR-07348RL 17 0 R5, R6 RES., CHIP, 348, 1%, 0402 OPT 18 0 R19 RES., CHIP, 0, 5%, 0402 YAGEO, RC0402JR-070RL DC1774A2-A Required Circuit Components 1 1 DC1774A-2 GENERAL BOM 2 2 C2, C4 CAP., X7R, 1000pF, 50V, 5%, 0402 AVX, 04025C102JAT2A 3 1 C5 CAP., X7R, 1000pF, 50V, 5%, 0603 AVX, 06035C102JAT2A 4 1 C9 CAP., COG, 62pF, 16V, 2%, 0402 AVX, 0402YA620GAT2A 5 2 C14, C15 CAP., X7R, 1000pF, 25V 5%, 0402 AVX, 04023C102JAT2A 6 1 C23 CAP., X5R, 0.1F, 10V, 10%, 0603 AVX, 0603ZD104KAT2A 7 1 L2 INDUCTOR, CHIP, 560nH, 5%, 0603LS-1608 COILCRAFT, 0603LS-561XJLB 8 1 J8 CONN., SMA 50 EDGE-MOUNTED JOHNSON, 142-0701-851 9 0 J10 CONN., SMA 50 EDGE-MOUNTED OPT 10 1 R1 RES., CHIP, 348, 1%, 0402 YAGEO, RC0402FR-07348RL 11 2 R3, R4 RES., CHIP, 0, 1/16W, 5%, 0603 YAGEO, RC0603JR-070RL 12 0 R13, R14, R17, R18 RES., CHIP, 0, 1/16W, 5%, 0603 OPT 13 0 T1, T2 XFMR, MINI-CIRCUITS, ADT2-1T+ OPT 14 2 T3, T4 XFMR, 2:1 MINI CIRCUITS, ADT2-1T+ 15 1 U1 IC, IF AMP., QFN24UF-4x4 LINEAR TECHNOLOGY, LTC6430AIUF-15 dc1774aaf 8 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D -IN OPT +IN GND GND CAL IN * J9 J7 E6 J18 J5 *0603 R3 3 1 4 * * 0603 R14 * T3 0603 C14 1000pF C13 1000pF R6 348 C12 62pF R5 348 R1 348 C9 62pF R2 348 5 2. ALL DNC PINS ON U1 ARE FOR LINEAR USE ONLY. 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE 0402. 4 C19 1000pF 6 8 10 5 7 9 R3, R4 0 OHM 0 OHM OPT 11 12 4 2 3 1 6 5 4 6 5 4 3 2 1 T2 SEE BOM SMA J6 C7 VCC 1000pF 1 3 3 CAL OUT U1 * 3 L2 560nH THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. KIM T. JOHN C. APP ENG. APPROVALS 2 SCALE = NONE C15 1000pF 6 5 4 DESCRIPTION PRODUCTION 2 1 REVISION HISTORY REV * 0603 R18 * T4 0603 * R17 DATE: N/A SIZE * R4 L2 560nH 560nH OPT 0603 JOHN C. APPROVED E3 J11 J8 +5V +5V *-OUT +OUT * 1 DEMO CIRCUIT 1774A LTC643XIUF FAMILY Friday, November 09, 2012 IC NO. DATE 11-09-12 SHEET 1 2 OF 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R1 348 348 OPT SMA SMA J10 IF AMP/ADC DRIVER TECHNOLOGY C23 0.1uF 0.1uF OPT 1 3 TITLE: SCHEMATIC C14,C15 1000pF, 0402 OPT OPT C5 1000pF VCC C21 1000pF VCC C9 62pF 62pF OPT C23 0.1uF C22 0.1uF __ ECO THIS IS A UNIVERSAL PCB, DESIGNED TO ACCOMMODATE MULTIPLE VERSIONS OF THE IC. REFER TO SIMPLIFIED SCHEMATIC IN FIGURE 3 OF THE DEMO MANUAL. 2 PCB DES. C4 1000pF C3 1000pF L1 560nH C5 1000pF, 0603 1000pF, 0603 OPT L22 OPT 1008 CUSTOMER NOTICE C2,C4 1000pF, 0402 1000pF, 0402 OPT OPT R19 L11 OPT 1008 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. J10 OPT OPT STUFF JP3 HD2X4-100 OPT GND 14 -OUT 13 T_DIODE 16 DNC 15 +OUT 18 GND 17 JP2 HD2X4-100 OPT Figure 6. DC1774A RF/IF AMP/ADC Driver J8 STUFF STUFF OPT C20 1000pF VCC DNC DNC DNC DNC DNC DNC R13,R14,R17,R18 OPT OPT 0 OHM JP1 HD2X6-100 OPT C17 1000pF C16 1000pF C8 62pF T3, T4 ADT2-1T+ ADTL2-18 OPT C2 1000pF C1 1000pF FREQ. 100-300 MHz 400-1000 MHz 100-1200 MHz 4 5 6 C18 1000pF R13 U1 LTC6430AIUF-15 LTC6430AIUF-15 LTC6431AIUF-15 3 5 6 C11 1000pF NOTE: UNLESS OTHERWISE SPECIFIED ASSY -A -B -C SMA SMA SMA 1 T1 SEE BOM GND 25 C10 62pF -IN 7 VCC 9 4 OPTIONAL CIRCUIT 4 +IN 24 GND 23 GND 8 2 1 VCC 22 DNC 21 DNC 2 1 10 3 DNC 4 3 11 8 7 6 5 DNC 20 DNC 19 DNC 6 5 12 8 7 5 A B C D DEMO MANUAL DC1774A-A Schematic Diagram dc1774aaf 9 DEMO MANUAL DC1774A-A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation dc1774aaf 10 Linear Technology Corporation LT 0113 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2013