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User Guide for ANALOG DEVICES models including: EVAL-LTM4652-AZ Dual 25A or Single 50A Step Down Module Regulator, EVAL-LTM4652-AZ, Dual 25A or Single 50A Step Down Module Regulator, Single 50A Step Down Module Regulator, Step Down Module Regulator, Down Module Regulator, Module Regulator, Regulator
23 ore fa — Ordering Information appears at end of this user guide. Quick Start. Required Equipment. • Three Power Supplies. • Three Electronic Loads. • Three Digital ...
11 hours ago — Ordering Information appears at end of this user guide. Quick Start. Required Equipment. • Three Power Supplies. • Three Electronic Loads. • Three Digital ...
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DocumentDocumentEvaluation Board User Guide EVAL-LTM4652-AZ LTM4652 Bidirectional Dual 25A or Single 50A Step-Down µModule Regulator General Description The EVAL-LTM4652-AZ evaluation board features the LTM®4652EY, source/sink dual ±25A or single ±50A output switching mode step-down DC-to-DC µModule® regulator. The input voltage is from 4.5V to 18V. The output voltage is programmable from 0.6V to 5V. The EVAL-LTM4652-AZ evaluation board can deliver 25A maximum current from each channel. As explained in the LTM4652 data sheet, the output current derating is necessary for certain VIN, VOUT, and thermal conditions. The EVAL-LTM4652-AZ evaluation board operates in continuous-conduction mode (CCM) in heavy load conditions. For high efficiency at low load currents, pulseskipping mode (PSM) is selected with the MODE jumper (JP1) for noise-sensitive applications. Two outputs can be connected in parallel for a single 50A output solution with optional jumper resistors. The evaluation board allows the user to program how its output ramps up and down through the TRACK/SS pin. The output can be set up to either coincidentally, or ratiometrically track with another supply's output. Remote output voltage sensing is available for improved output voltage regulation at the load point. These features and the compact size of the LTM4652, 16mm × 16mm × 4.92mm, BGA package, make it ideal for use in many high-density point-of-load (POL) regulation applications. The LTM4652 data sheet must be read in conjunction with this user guide for working on or modifying the EVAL-LTM4652-AZ evaluation board. Features and Benefits · Bidirectional Output Current up to ±25A · Parallel Channel Current Sharing up to ±50A · Current Mode Control/Fast Transient Response · Output Voltage Differential Remote Sensing EVAL-LTM4652-AZ Evaluation Board Files FILE DESCRIPTION EVAL-LTM4652-AZ Design files Ordering Information appears at end of this user guide. Quick Start Required Equipment · Three Power Supplies · Three Electronic Loads · Three Digital Multimeters (DMMs) · Two Load Protection Diodes Quick Start Procedure Sourcing Current Condition Procedure The EVAL-LTM4652-AZ evaluation board is easy to set up to evaluate the performance of the LTM4652. See Figure 2 for proper measurement setup and use the following sourcing current condition procedure. 1. Before powering up the EVAL-LTM4652-AZ, place jumpers in the following positions for a typical application: JP1 JP2 MODE RUN1 CCM ON JP3 JP4 JP5 JP6 RUN2 TRACK1 5V BIAS TRACK2 ON ON OFF SOFT START 2. With power off, connect the input power supply to VIN (J4) and GND (J5). Connect VIN supply to 12V. 3. With power off, connect the first output load to VOUT1 (J6) and GND (J7). Connect the second output load to VOUT2 (J8) and GND (J9). Preset the loads to 0A. 4. Connect the first DMM between test points VOUT1 (E6) and GND (E7). Connect the second DMM between test points VOUT2 (E8) and GND (E9). 5. Turn on the power supply at the input and set the voltage between 4.5V and 18V. The output voltage in Channel 1 should be 1.2V ±1% (1.188 ~ 1.212V) and the output voltage in Channel 2 should be 1.52V ±1% (1.485V ~ 1.535V). 6. Once the proper output voltage is established, adjust the input voltage to 12V and the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency, and other parameters. Output ripple should be measured at J1 and J2 with Bayonet NeillConcelman (BNC) cables. The 50 termination should be set on the oscilloscope or BNC cables. Rev. 0 One Analog Way, Wilmington, MA 01887-2356, U.S.A. DOCUMENT FEEDBACK Tel: 781.329.4700 TECHNICAL SUPPORT ©2024 Analog Devices, Inc. All rights reserved. Evaluation Board User Guide Evaluation Board Photo EVAL-LTM4652-AZ Figure 1. EVAL-LTM4652-AZ Evaluation Board (Part Marking Is either Ink Mark or Laser Mark) Performance Summary Specifications are at TA = 25°C PARAMETER SYMBOL CONDITIONS Input voltage range Output voltage Switching frequency Maximum output current Efficiency VIN VOUT1 VOUT2 fSW IOUT RFB = 60.4k RFB = 40.2k RFREQ = 95.3k VIN = 4.5V to 18V, fSW = 400kHz VIN = 12V, VOUT = 1.2V, IOUT = 25A, fSW = 400kHz VIN = 12V, VOUT = 1.5V, IOUT = 25A, fSW = 400kHz MIN TYP MAX VALUE 4.5 18 V 1.2 V 1.5 V 400 kHz 25 A 86.2 % 88.1 % analog.com Rev. 0 2 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ Figure 2. Test Setup of EVAL-LTM4652-AZ Evaluation Board analog.com Rev. 0 3 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ Sinking Current Condition Procedure See Figure 3 for proper measurement equipment setup for the sinking current condition and use the following test procedure. This procedure shows how to use an electric load to test sinking current capability. 1. Before powering up the EVAL-LTM4652-AZ, place jumpers in the following positions for a typical application: JP1 MODE CCM JP2 RUN1 ON JP3 RUN2 ON JP4 TRACK1 ON JP5 5V BIAS OFF JP6 TRAC2 SOFT START 2. With power off, connect an ammeter to VIN (J4), then connect the input power supply and free-wheeling load in parallel between the ammeter and GND (J5). 3. On the Channel 1 output, starting from GND (J7), connect the bias supply, the output load, and the load reverse protection diode to VOUT1 (J6). The diode should have a current rating greater than the maximum desired output load value and a voltage rating greater than VF_DIODE + |VOUT|. Refer to 1N5831 as an example. Repeat this step with a second power supply, load, and protection diode for Channel 2. 4. Connect a DMM between the input test points: VIN (E4) and GND (E5) to monitor the input voltage. Connect a DMM between VOUT1 (E6) and GND (E7) to monitor DC output VOUT1. Connect a second DMM between VOUT2 (E8) and GND (E9) to monitor DC output VOUT2. 5. Turn on the output bias power supply, measure, and increase the voltage to 10V. Turn on the input power supply voltage and raise the VIN between 4.5V and 18V. The output voltage on Channel 1 should be 1.2V ±1% (1.188 ~ 1.212V) and the output voltage in Channel 2 should be 1.52V ±1% (1.485V ~ 1.535V). 6. Once the input and output voltages are properly established, adjust the input voltage to 12V. 7. When sinking current in this configuration, an electronic load is used as the free-wheeling load, and it must be turned on first. Turn on the free-wheeling load and increase above IOUT × |VOUT|/VIN. Current will be flowing from the VIN power supply and into the free-wheeling load. 8. The output sinking current can now be applied on each channel within the operating range of 0A to a maximum 25A load. Observe the output voltage regulation, output ripple voltage, switching node waveforms, and other parameters. Note: When removing the loads and powering the circuit off, this procedure must be followed in reverse step order. Decrease the sinking current(s) to 0A and turn off the output load, decrease the free-wheeling load to 0A, and turn off the free-wheeling load, the run pin may be pulled low here. Then, turn off the VIN supply, and lastly, turn off the output VBIAS power supply. analog.com Rev. 0 4 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ Figure 3. Test Setup of EVAL-LTM4652-AZ Evaluation Board The EVAL-LTM4652-AZ provides a convenient onboard BNC terminal to accurately measure the output ripple voltage. Connect a short BNC cable on (J1) to an oscilloscope (scope probe ratio 1:1, AC-coupling) to observe the output ripple voltage. To measure the input/output voltage ripples properly, do not use the long ground lead on the oscilloscope probe. See Figure 4 for the proper probing technique of input/output voltage ripples. Short, stiff leads need to be soldered to the (+) and () terminals of an input or output capacitor. The probe's ground ring needs to touch the () lead, and the probe tip needs to touch the (+) lead. analog.com Rev. 0 5 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ + COUT 004 VOUT GND Figure 4. Scope Probe Placement for Measuring Input or Output Ripple Voltage EVAL-LTM4652-AZ Evaluation Board Features · Onboard Load Step Circuit. The EVAL-LTM4652-AZ provides onboard load transient circuits to quickly check VOUT peak-to-peak deviation during rising or falling dynamic load transients for each channel. The simple load step circuit consists of a 40V N-channel power MOSFET in series with a 10m, 0.5W, 1% current sense resistor. The MOSFET is configured as a voltage control current source (VCCS) device; therefore, the output current step and its magnitude are created and controlled by adjusting the amplitude of the applied input voltage step at the gate of the MOSFET. Use a function generator to provide a voltage pulse between IOSTEP CLK (E17) and GND; this voltage pulse should be set at a pulse width of less than 2ms and a maximum duty cycle of less than 1% to avoid excessive thermal stress on the MOSFET devices. The output current step is measured directly across the current sense resistors and monitored by connecting the BNC cable from IOSTEP (J3) to the input of the oscilloscope (scope probe ratio 1:0.01, dc-coupling). The equivalent voltage to the current scale is 10mV/1A. The load step current slew rate dI/dt can be varied by adjusting the rise time and fall time of the input voltage pulse. Switch the jumper resistors R34 or R35 (on the backside of the board) to apply load transient on Channel 1 or Channel 2, correspondingly. · Temperature Sensing. The LTM4652 IC temperature is measured with an onboard circuit utilizing Analog Devices LTC®2997. The 5VBIAS circuit must be enabled by adding 0 on R59 and placing jumper JP6 in the ON position. The LTC2997 converts the voltage from a diode-configured PNP transistor inside the LTM4652 through its TEMP+ and TEMP pins into VPTAT. This VPTAT voltage correlates to the LTM4652 IC temperature using the following conversion: TEMP (K) = VPTAT/4mV. · Driving SW with an External Clock. The LTM4652 can be synchronized to an external clock signal. Place the JP1 jumper on EXT_CLK and apply a 0V ~ 3V, square wave clock signal (250kHz to 780kHz) on the CLKIN test point (E16). · Output Voltage Tracking. The outputs of LTM4652 can track another supply. The jumpers JP4 and JP5 allow choosing soft-start or output tracking. If tracking external voltage is selected, the corresponding test points, TRACK1 (E1) or TRACK2 (E10), must be connected to a valid voltage signal. · Dual-Phase Single-Output Operation. The LTM4652 modules can be configured for a 2-phase single output for up to 50A on EVAL-LTM4652-AZ. Install 0 resistors on R14, R17, R28, R39, R43, R44, R45 and remove R7, R19. The output voltage is then set by R25 based on the following equation: VOUT = 0.6V(1 + 60.4k/R25). · Output Voltage Remote Sensing. The Onboard differential remote sense amplifier can be connected to either of the LTM4652 outputs to accurately regulate the output voltage at the remote point-of-load. To use the differential amplifier, remove R48 and R55 and connect DIFFN, DIFFP, and DIFFOUT either to Channel 1 (R29, R32, R21) or to Channel 2 (R31, R33, R11). analog.com Rev. 0 6 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ 005b Typical Performance Characteristics EFFICIENCY (%) 96 94 92 90 88 86 84 82 80 25 20 15 10 5 0 1.0VOUT, 300kHz 1.2VOUT, 400kHz 1.5VOUT, 400kHz 5 10 15 20 25 LOAD CURRENT (A) (a) Efficiency 005a POWER LOSS (W) 4.5 1.0VOUT, 300kHz 4.0 1.2VOUT, 400kHz 1.5VOUT, 400kHz 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 25 20 15 10 5 0 5 10 15 20 25 LOAD CURRENT (A) (b) Power Loss Figure 5. Measured Supply at VIN = 5V 95 93 91 89 87 85 83 81 79 77 75 25 20 15 10 5 0 1.0VOUT, 300kHz 1.2VOUT, 400kHz 1.5VOUT, 400kHz 5 10 15 20 25 LOAD CURRENT (A) 006a POWER LOSS (W) 5.5 5.0 1.0VOUT, 300kHz 1.2VOUT, 400kHz 4.5 1.5VOUT, 400kHz 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 25 20 15 10 5 0 5 10 15 20 25 LOAD CURRENT (A) (a) Efficiency (b) Power Loss Figure 6. Measured Supply at VIN = 12V EFFICIENCY (%) 006b analog.com Rev. 0 7 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ VIN (V) VOUT1 (V) LOAD1 (A) VOUT2 (V) LOAD2 (A) FREQ (kHz) AIRFLOW (LFM) MAX CASE TEMP (°C) 12 1.2 25 1.5 25 400 0 83 Figure 7. Measured Thermal Captures without Forced Airflow VOUT AC-COUPLED 50mV/DIV VOUT AC-COUPLED 50mV/DIV LOAD STEP 5A/DIV LOAD STEP 5A/DIV 50µs/DIV VIN = 12V, VOUT = 1.2V fSW = 400kHz COUT = 3 × 100µF CERAMIC + 3 × 220µF BULK RTH = 1.4k, CTH = 6.8nF CTHP = 47pF ILOAD = 0A TO 6A TO 0A AT 5A/µs VOUT, PEAK-TO-PEAK = 72mV (a) 1.2VOUT 50µs/DIV VIN = 12V, VOUT = 1.5V fSW = 400kHz COUT = 3 × 100µF CERAMIC + 3 × 220µF BULK RTH = 1.4k, CTH = 6.8nF CTHP = 47pF ILOAD = 0A TO 6A TO 0A AT 5A/µs VOUT, PEAK-TO-PEAK = 82mV (b) 1.5VOUT Figure 8. Load Transient Response 008a 008b analog.com Rev. 0 8 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ VOUT AC-COUPLED 20mV/DIV VOUT AC-COUPLED 20mV/DIV 009a 009b 5µs/DIV VOUT, PEAK-TO-PEAK = 21mV 5µs/DIV VOUT, PEAK-TO-PEAK = 24mV (a) 1.2VOUT, 400kHz, 20MHz Bandwidth (b) 1.5VOUT, 400kHz, 20MHz Bandwidth Figure 9. Tested Single Channel Operation VOUT AC Ripple at 12VIN, IOUT = 25A EVAL-LTM4652-AZ Evaluation Board Bill of Materials QTY REFERENCE PART DESCRIPTION Required Circuit Components 1 C1 CAP. CER 4.7F 16V 20% X5R 0805 2 C10, C12 CAP. CER 47pF 50V 5% C0G 0603 4 C13-C16 CAP. CER 1F 10V 10% X7R 0603 2 C17, C18 CAP. CER 6.8nF 50V X7R 0603 1 C19 CAP. CER 470pF 50V 10% X7R 0603 1 C2 CAP. CER 1F 25V 10% X7R 0805 AEC-Q200 1 C20 NRND CAP. CER 0.1F 25V 10% X7R 0603 1 C21 CAP. CER 10F 16V 20% X5R 1210 1 C22 CAP. CER 220pF 50V 10% X7R 0603 1 C23 CAP. CER 0.047F 50V 10% X7R 0603 AEC-Q200 LOW ESR 2 C25, C26 CAP. CER 100F 16V 20% X5R 1210 2 C5, C7 CAP. CER 100nF 25V 10% X5R 0402 2 C6, C9 CAP. CER 100pF 50V 5% C0G 0603 1 CN1 CAP. ALUM POLY 330F 25V 20% 10mm × 12.6mm 0.014 5000mA 5000H 4 CIN2-CIN5 CAP. CER 22F 25V 10% X5R 1210 6 COUT3-COUT5, COUT8, COUT11, COUT17 CAP. CER 100F 6.3V 20% X5R 1210 MANUFACTURER/PART NUMBER KEMET, C0805C475M4PACTU WURTH ELEKTRONIK, 885012006055 KEMET, C0603C105K8RACTU WURTH ELEKTRONIK, 885012206088 AVX CORPORATION, 06035C471KAT2A TDK, CGA4J3X7R1E105K125AB TDK, C1608X7R1E104K080AA WÜRTH ELEKTRONIK, 885012109009 WÜRTH ELEKTRONIK, 885012206079 TDK, CGA3E2X7R1H473K080AA TAIYO YUDEN, EMK325ABJ107MM-P TDK, C1005X5R1E104K050BC WÜRTH ELEKTRONIK, 885012006057 PANASONIC, 25SVPF330M SAMSUNG, CL32A226KAJNNNE SAMSUNG, CL32A107MQVNNNE 6 COUT2, COUT6, COUT13-COUT16 CAP. CER 220F 6.3V 20% X5R 1210 MURATA, GRM32ER60J227ME05L analog.com Rev. 0 9 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ QTY 1 1 5 6 2 5 1 3 1 1 2 1 1 2 1 1 REFERENCE L1 Q1 R1, R3, R22, R26, R51 R7, R23, R48-R50, R55 R10, R13 R9, R12, R15, R18, R25 R19 R24, R27, R36 R30 R37 R46, R47 R5 R52 R53 R54 U1 PART DESCRIPTION IND SHIELDED POWER, 105 DCR 3.6A TRAN N-CH MOSFET 40V 14A RES. SMD 10 1% 1/10W 0603 AEC-Q200 RES. SMD 0 JUMPER 1/10W 0603 AEC-Q200 PRECISION POWER RES. SMD 6.04k 1% 1/10W 0603 AEC-Q200 RES. SMD 60.4k 1% 1/10W 0603 AEC-Q200 RES. SMD 40.2k 1% 1/10W 0603 AEC-Q200 RES. SMD 10k 1/10W 1% 0603 RES. SMD 95.3k 1% 1/10W 0603 AEC-Q200 RES. SMD 0.01 1% 2W 2512 AEC-Q200 RES. SMD 1.4k 1% 1/10W 0603 AEC-Q200 RES. SMD 845k 1% 1/10W 0603 AEC-Q200 RES. SMD 80.6k 1% 1/10W 0603 AEC-Q200 RES. SMD 105k 1% 1/10W 0603 AEC-Q200 RES. SMD 20k 5% 1/10W 0603 AEC-Q200 IC-ADI SOURCE/SINK DUAL OR SINGLE Module REGULATOR WITH INPUT OVERVOLTAGE PROTECTION, BGA144 MANUFACTURER/PART NUMBER COILCRAFT INC, XAL6060-333MEC VISHAY, SUD50N04-8M8P-4GE3 VISHAY, CRCW060310R0FKEA VISHAY, CRCW06030000Z0EA VISHAY, CRCW06036K04FKEA VISHAY, CRCW060360K4FKEA VISHAY, CRCW060340K2FKEA VISHAY, CRCW060310K0FKEA VISHAY, CRCW060395K3FKEA VISHAY, WSL2512R0100FEA18 PANASONIC, ERJ-3EKF1401V VISHAY, CRCW0603845KFKEA VISHAY, CRCW060380K6FKEA PANASONIC, ERJ-3EKF1053V PANASONIC, ERJ-3GEYJ203V ANALOG DEVICES, LTM4652EY#PBF 1 U2 IC-ADI REMOTE/INTERNAL TEMPERATURE SENSOR, DFN6 ANALOG DEVICES, LTC2997IDCB#TRMPBF 1 U3 IC-ADI STEP-DOWN DC-TO-DC CONVERTER SYNCHRONOUS 76V 0.5A AUTOMOTIVE 16LD MSOP ANALOG DEVICES, LTC3630AEMSE#PBF Additional Evaluation Board Circuit Components C3, C4, C8, C11, C24 CAP., OPTION, 0603 COUT9, COUT10, COUT12, COUT18 CAP., OPTION, 7343 R2, R4, R6, R8, R11, R14, R16, R17, R20, R21, R28, R29, R31-R33, R39-R42, R59 RES., OPTION, 0603 R35 RES., OPTION, 2010 R19, R22, R26, R27, R30, R31, R33, R34, R38, R39, R46, R51, R53, R58, R60, R61, R63, R66, R68 RES., OPTION, 2512 R34 RES. SMD 0 JUMPER 2010 AEC-Q200 Hardware: For Evaluation Board Only 16 E1-E10, E12, E13-E18 CONN-PCB SOLDER TERMINAL TEST POINT TURRET 0.094 MTG. HOLE PCB 0.062 THK 3 J1-J3 CONN-PCB BNC JACK ST 50 VISHAY, CRCW20100000Z0EF MILL-MAX, 2501-2-00-80-00-00-07-0 AMPHENOL CONNEX, 112404 analog.com Rev. 0 10 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ QTY 2 4 4 4 8 2 4 4 6 REFERENCE J4, J5 J6-J9 J6-J9 J6-J9 J6-J9 JP1, JP5 JP2-JP4, JP6 MH1-MH4 XJP1-XJP6 PART DESCRIPTION CONN-PCB BANANA JACK CONN-PCB THREADED BROACHING STUD, 625MIL LENGTH CONNECTOR RING LUG TERMINAL, 10 CRIMP, NON-INSULATED WASHER, #10 FLAT STEEL NUT, HEX STEEL, 10-32 THREAD, 9.27mm OUT DIA MANUFACTURER/PART NUMBER KEYSTONE ELECTRONICS, 575-4 PENN ENGINEERING KEYSTONE, 8205 KEYSTONE, 4703 KEYSTONE, 4705 CONN-PCB 6-POS MALE HDR UNSHROUDED DUAL ROW ST, 2mm PITCH, 2.70mm SOLDER TAIL WÜRTH ELEKTRONIK, 62000621121 CONN-PCB 3-POS MALE HDR UNSHROUDED SINGLE ROW ST, 2mm PITCH, 2.70mm WÜRTH ELEKTRONIK, 62000311121 SOLDER TAIL STANDOFF, BRD SPT SNAP FIT 12.7mm LENGTH SHUNT FEMALE 2-POS 2mm KEYSTONE, 8833 WÜRTH ELEKTRONIK, 60800213421 analog.com Rev. 0 11 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ EVAL-LTM4652-AZ Evaluation Board Schematic analog.com Rev. 0 12 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ EVAL-LTM4652-AZ Evaluation Board Schematic (continued) analog.com Rev. 0 13 of 15 Evaluation Board User Guide EVAL-LTM4652-AZ Ordering Information PART TYPE EVAL-LTM4652-AZ The EVAL-LTM4652-AZ evaluation board features the LTM4652EY Module regulator. Revision History REVISION NUMBER 0 REVISION DATE 09/24 DESCRIPTION Initial release. PAGES CHANGED -- analog.com Rev. 0 14 of 15 Evaluation Board User Guide Notes EVAL-LTM4652-AZ ALL INFORMATION CONTAINED HEREIN IS PROVIDED "AS IS" WITHOUT REPRESENTATION OR WARRANTY. NO RESPONSIBILITY IS ASSUMED BY ANALOG DEVICES FOR ITS USE, NOR FOR ANY INFRINGEMENTS OF PATENTS OR OTHER RIGHTS OF THIRD PARTIES THAT MAY RESULT FROM ITS USE. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. NO LICENSE, EITHER EXPRESSED OR IMPLIED, IS GRANTED UNDER ANY ADI PATENT RIGHT, COPYRIGHT, MASK WORK RIGHT, OR ANY OTHER ADI INTELLECTUAL PROPERTY RIGHT RELATING TO ANY COMBINATION, MACHINE, OR PROCESS, IN WHICH ADI PRODUCTS OR SERVICES ARE USED. TRADEMARKS AND REGISTERED TRADEMARKS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS. ALL ANALOG DEVICES PRODUCTS CONTAINED HEREIN ARE SUBJECT TO RELEASE AND AVAILABILITY. analog.com Rev. 0 15 of 15