DEMO MANUAL DC1639 LTC6360 High Speed Op Amp with True Zero Output DESCRIPTION Demonstration circuit 1639 allows quick setup of the LTC6360 true zero op amp. The op amp is configured as a unity gain buffer, with landing pads provided to make other gains configurable. Ample bypass is provided for both the input supply and for the –0.6V on-chip charge pump. The recommended 10Ω 330pF output compensation is provided on board for unity-gain stability. If this compensation is removed, gain bandwidth increases but the op amp is stable only in gains of four and higher. 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. OPERATING PRINCIPLES Most op amps which operate on single supplies have outputs that cannot get all the way to ground. The saturation of their output devices leave 10’s of millivolts of output voltage error when the output tries to swing to ground. The LTC6360 has an onboard charge pump that creates a –0.6V internal supply for the output stage, so it can swing all the way to ground and even a little below ground. QUICK START PROCEDURE Demonstration circuit 1639 is simple to use, with only one jumper provided to allow the shutdown option. 1. Set the power supply to 5V, then turn off the power supply. As shown in Figure 1, connect the +5V lead from the power supply to the V+ terminal of the demo circuit, and connect the COM side of the supply to the GND terminal of the demo circuit. 2. Turn on the supply. Note that without input exciatation the output is very near 0mV, much closer to ground than most op amps can achieve. 3. You are now free to connect a source to the input and exercise the LTC6360. The input range is 0V to about 4.25V. (Under high frequency large signal swing exciatation, you may see some odd behavior as the negative charge pump voltage begins to safely collapse.) to the schematic in Figure 2. Install appropriate resistors at R7 and R6, and install appropriate impedances at C7 and R5 (shorts and/or blocking capacitance). The time domain and frequency responses can be adjusted using a small capacitance at C8. 5. For inverting gain, install J2 and appropriate passives in the path to the –input. For inverting gains, the +input must be biased up at some voltage. Installing R13 connects the +input to the “EXT_VCM” turret which is biased nominally at 2V by R11 and R12, or the turret can be driven with an external supply. 6. Shutdown: The LTC6360 can be shut down by moving the shunt on JP1 from the “Enable” position to the “Disable” position. It can also be shut down and reactivated electrically via the SHDN turret, in which case the shunt on JP1 should be removed entirely. 4. If you want to set the LTC6360 for some other positive gain, turn off the supply and disconnect the board. Refer dc1639f 1 DEMO MANUAL DC1639 QUICK START PROCEDURE Figure 1. Proper Equipment Setup. PARTS LIST ITEM QTY REFERENCE Required Circuit Components 1 2 C1, C5 2 0 C2, C6 3 0 C3, C7 4 3 C4, C10, C13 5 0 C8 6 1 C9 7 3 C11, C12, C14 8 1 C15 9 0 C16 10 5 E1-E5 11 1 JP1 12 1 XJP1 13 2 J1, J3 14 0 J2 15 6 R1,R3, R7, R9, R14, R15 16 1 R2 17 0 R4, R6, R10, R13 18 0 R5 19 1 R8 20 1 R11 21 1 R12 22 4 MH1-MH4 (STAND-OFF) 23 1 U1 24 1 25 1 STENCIL FOR TOP SIDE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R, 1μF, 16V, 10% 0603 CAP., 0805 CAP., 0603 CAP., X7R, 0.1μF, 25V, 10% 0603 CAP., 0603, NPO CAP., X7R, 0.01μF, 50V, 10% 0603 CAP., X5R, 10μF, 6.3V, 20% 0805 CAP.,CERM 330pF, 50V, NPO, 0805 CAP., 0805, NPO TESTPOINT, TURRET, .065" PBF HEADER, 3 PINS, 2mm SHUNT, 2mm CENTER CONN, BNC, SMA 50Ω EDGE-LANCH CONN, BNC, SMA 50Ω EDGE-LANCH RES., CHIP, 0, 1/10W, 0603 RES., CHIP, 49.9, 1/8W, 1% 0805 RES., 0603 RES., 0805 RES., CHIP, 10, 1/10W, 1% 0603 RES., CHIP, 30.1k, 1/10W, 1% 0603 RES., CHIP, 20k, 1/10W, 1% 0603 STAND-OFF, NYLON (SNAP ON), 0.50" TALL LOW NOISE ADC DRIVER W/TRUE ZERO OUTPUT FAB, PRINTED CIRCUIT BOARD STENCIL AVX, 0603YC105KAT2A OPT OPT AVX, 06033C104KAT2A OPT AVX, 06035C103KAT2A AVX, 08056D106MAT2A AVX, 08055A331JAT2A OPT MILL-MAX, 2308-2-00-80-00-00-07-0 SAMTEC, TMM-103-02-L-S SAMTEC, 2SN-BK-G E. F. JOHNSON, 142-0701-851 OPT VISHAY, CRCW06030000Z0EA VISHAY, CRCW080549R9FKEA OPT OPT VISHAY, CRCW060310R0FKEA VISHAY, CRCW060330K1FKEA VISHAY, CRCW060320K0FKEA KEYSTONE, 8833(SNAP ON) LINEAR TECH., LTC6360CMS8E#TRPBF DEMO CIRCUIT #1639A STENCIL 1639A dc1639f 2 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 J1 SMA 5 R3 = 0 R13 = OPEN INSTALL NOT INSTALL DC MODE (SHOWN) - IN INSTALL INSTALL * SEE TABLE BELOW FOR ALTERNATE VALUES + IN J2 SMA GND E4 C6 OPT 0805 R4 OPT R13 = 10k R3 = 1uF AC MODE C2 OPT 0805 R1 0 R12 20k R11 30.1k 4 0 GND E5 R2 49.9 0805 R5 OPT 0805 * R3 C1 1uF EXT VCM E1 C7 OPT C3 OPT * DISABLE ENABLE R6 OPT OPT R13 V+ R7 0 2 JP1 SHDN E2 3 C4 .1uF ** R8 10 C16 OPT NPO 0805 J3 SMA C14 10uF 0805 OUT R15 0 C9 .01uF CUSTOMER NOTICE 0 R9 R10 OPT C13 .1uF VCC 9 LTC6360CMS8E U1 Figure 2 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 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. C15 330pF NPO 0805 ** OPT NPO C8 R14 0 C5 1uF GND -IN 1 7 SHDN OUT 2 6 CPI VCC 3 VCC 4 1 3 8 +IN 5 CPO VDD 4 5 C11 10uF 0805 E3 2 SCALE = NONE NC GLEN B. PCB DES. APP ENG. APPROVALS V+ V+ 4.75V - 5.25V C10 .1uF 2 DATE: N/A SIZE 1 REVISION HISTORY PRODUCTION FAB DESCRIPTION GLEN B. APPROVED DATE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 03-29-11 03-29-11 IC NO. 1 LTC6360CMS8E DEMO CIRCUIT 1639A SHEET 1 OF 1 2 REV. LOW NOISE ADC DRIVER W / TRUE ZERO OUTPUT TECHNOLOGY FOR STABILITY. ** R8 AND C15 ARE NEEDED NOTE: UNLESS OTHERWISE SPECIFIED ALL RESISTORS: OHMS, 0603, 1%, 1/10W 2 - TITLE: SCHEMATIC C12 10uF 0805 REV ECO A B C D DEMO MANUAL DC1639 SCHEMATIC DIAGRAM dc1639f 3 DEMO MANUAL DC1639 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 © 2004, Linear Technology Corporation dc1639f 4 Linear Technology Corporation LT 0811 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011