LMH34400DRLEVM

www.ti.com Table of Contents User’s Guide LMH34400 Evaluation Module ABSTRACT The characteristics, operation, and use of the LMH34400DRLEVM is described in this user's guide. This evaluation module (EVM) is an evaluation and development kit for evaluating the LMH34400DRL device, a single-ended transimpedance amplifier for light detection and ranging (LIDAR) applications and laser distance measurement systems. A complete circuit description as well as schematic diagram and bill of materials are included in this document. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with LMH34400DRLEVM. Related documentation is available through the Texas Instruments website at www.ti.com. Table of Contents 1 Introduction.............................................................................................................................................................................3 2 Feature Description................................................................................................................................................................ 3 3 EVM Specifications.................................................................................................................................................................3 4 Power Connections................................................................................................................................................................ 3 5 Input and Output Connections.............................................................................................................................................. 3 5.1 Ambient Light Cancellation................................................................................................................................................ 3 5.2 Power Down Function........................................................................................................................................................ 3 5.3 Optional Output DC Bias Configuration............................................................................................................................. 3 6 Layout...................................................................................................................................................................................... 4 7 Schematic................................................................................................................................................................................6 8 Bill of Materials....................................................................................................................................................................... 7 SBOU265 – FEBRUARY 2022 Submit Document Feedback LMH34400 Evaluation Module Copyright © 2022 Texas Instruments Incorporated 1 Trademarks www.ti.com List of Figures Figure 6-1. Top Layer...................................................................................................................................................................4 Figure 6-2. Ground Layer............................................................................................................................................................ 4 Figure 6-3. Power Layer.............................................................................................................................................................. 5 Figure 6-4. Bottom Layer............................................................................................................................................................. 5 Figure 7-1. Schematic..................................................................................................................................................................6 List of Tables Table 3-1. LMH34400DRLEVM Specifications............................................................................................................................ 3 Trademarks All trademarks are the property of their respective owners. 2 LMH34400 Evaluation Module SBOU265 – FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Introduction 1 Introduction The LMH34400DRLEVM is an evaluation module (EVM) for the LMH34400DRL single-ended transimpedance amplifier. The EVM features standard input power receptacles, coaxial input and output connections, and an optional output bias through a fixed 1VDC LDO regulator. The input is 50 Ω matched and configured by default to receive a voltage input that is converted to a current through a 4.02 kΩ resistor, but can be reconfigured to receive a true current input. The EVM also includes easy-to-use jumpers to enable or disable the LDO and control the input bias current cancellation and device shutdown functions. 2 Feature Description • • • • Configured for single-ended voltage input and output with 50 Ω matched SMA connections Optional DC-biased output configuration Jumpers included for easy control of output bias voltage, input bias current cancellation, and device powerdown Designed for single 3.3 V supply operation 3 EVM Specifications Table 3-1. LMH34400DRLEVM Specifications Specification Typical Value Single-supply voltage range (VEE = ground) 3 V to 3.45 V Quiescent current 29 mA Output voltage swing (VCC = 3.3 V, 100 Ω load) 2.5 Vpp Linear output current (VCC = 3.3 V, 25 Ω load) 26.6 mA 4 Power Connections The LMH34400DRLEVM is equipped with standard banana style sockets to easily connect power. The positive supply input is labeled 3V3 and ground is labeled GND. The positive supply should be well regulated and stable. 5 Input and Output Connections The LMH34400DRLEVM is equipped with 50 Ω matched SMA connectors for easy connection of signal generators and analysis equipment. VIN is the signal input connector, while VOUT is the signal output connector. Coaxial SMA connections for the ambient light cancellation (ALC) and power-down circuitry (PD) are included to aid with device characterization. Test points VREF an GND allow for easy measurement of the output bias or for the application of an external voltage bias on the signal output. 5.1 Ambient Light Cancellation The LMH34400 device features an input DC current cancellation circuit that is designed to remove any DC current that is present from a typical current input device such as a photodiode. This feature can be enabled or disabled using the ALC jumper, or by populating R4 with a zero-ohm resistor. By default, the DC current cancellation circuit is enabled. 5.2 Power Down Function The LMH34400 device includes an optional power-down function to put the device in a low-power mode when it is not being used. The EVM ships with jumper PD that can be used to easily enable and disable the device. By default, the board ships with the device enabled. 5.3 Optional Output DC Bias Configuration By default, the EVM is configured with a 50 Ω series load AC coupled to the output. To use the EVM with the onboard 1VDC output bias, populate R8 and short the EN jumper with the included shunt to enable the LP5912 regulator. To apply an external bias to the output, populate R8 and drive the desired voltage on the VREF test point. For more details and instructions on how to reconfigure the EVM, see the applications section, schematics, and layouts in the 275-MHz, Single-Ended Output, Transimpedance Amplifier with Integerated Clamp data sheet. SBOU265 – FEBRUARY 2022 Submit Document Feedback LMH34400 Evaluation Module Copyright © 2022 Texas Instruments Incorporated 3 Layout www.ti.com 6 Layout AMPS145A LMH34400DRLEVM For evaluation only; not FCC approved for resale. GND 3V3 J11 J10 C8 L1 C4 ALC PD EN C6 J7 J12 J9 VREF J4 J5 J3 R1 R3 C1 C12 C11C13 R7 R2 U2 C5 TP1 PD C9 U1 TP2 R8 C7 C3 R6 R4 J6 VOUT GND ALC Figure 6-1. Top Layer 4 R5 C2 VIN Figure 6-2. Ground Layer LMH34400 Evaluation Module SBOU265 – FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Layout Figure 6-3. Power Layer Figure 6-4. Bottom Layer SBOU265 – FEBRUARY 2022 Submit Document Feedback LMH34400 Evaluation Module Copyright © 2022 Texas Instruments Incorporated 5 Schematic www.ti.com 7 Schematic VCC J10 BLM15AX100SN1D 575-4 J3 C2 1 2 3 4 5 R2 49.9 35V 1uF R5 C4 10µF 10V J11 4.02k GND C3 1pF 25V VCC 1 2 GND VCC 2 1 1 R1 3 0 GRPB021VWVN-RC J5 M50-1900005 6 C12 50V 470pF C13 10V 0.01uF C14 16V 0.22uF C15 16V 0.47uF GND VCC IN OUT C7 R6 4 1 49.9 PD ALC VEE GND J12 142-0701-851 35V 1uF 5 R8 DNP DNP 100 LMH34400 1 R3 DNP DNP 49.9 2 3 4 5 C11 50V 47nF U1 2 GND J1 C8 100nF 50V 5 4 3 2 C1 35V 1uF GND C6 1µF 16V 575-4 142-0701-851 J4 VCC L1 GND 142-0701-851 TP1 TP2 5122 5011 J2 GND J6 1 VCC 2 1 GND VCC J8 GRPB021VWVN-RC J7 M50-1900005 U2 VCC 2 6 J9 1 4 2 3 4 5 2 R4 DNP DNP 49.9 1 EN PG 2 GND NC GND Thermal_Pad GND 3 C5 1µF 16V GRPB021VWVN-RC M50-1900005 142-0701-851 OUT 0 2 1 1 IN R7 5 7 C9 35V 1uF LP5912-1.0DRVR GND GND GND GND GND Figure 7-1. Schematic 6 LMH34400 Evaluation Module SBOU265 – FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Schematic 8 Bill of Materials Item # Designator Quantity 1 !PCB1 1 2 C1, C2, C7, C9 4 3 C3 4 C4 5 Value Part Number Manufacturer Description AMPS145 Any Printed Circuit Board Package Reference 1 µF C1005X5R1V105K050BC TDK CAP, CERM, 1 µF, 35 V, ± 10%, X5R, 0402 0402 1 1 pF GJM0335C1E1R0WB01D MuRata CAP, CERM, 1 pF, 25 V, ± 5%, C0G/NP0, 0201 0201 1 10 µF GCJ21BR71A106KE01L MuRata CAP, CERM, 10 µF, 10 V, ± 10%, X7R, AEC-Q200 Grade 1, 0805 0805 C5, C6 2 1 µF CGA3E1X7R1C105K080AC TDK CAP, CERM, 1 µF, 16 V, ± 10%, X7R, AEC-Q200 Grade 1, 0603 0603 6 C8 1 0.1 µF C0603C104K5RACAUTO Kemet CAP, CERM, 0.1 µF, 50 V, ± 10%, X7R, AEC-Q200 Grade 1, 0603 0603 7 C11 1 47 nF CGAEA1X7R1H473M030BC TDK Cap Ceramic 0.047 µF 50 V X7R 20% Wide Terminal SMD 0204 125°C Low ESR Automotive T/R 0204 8 C12 1 470 pF CGA1A2X7R1H471K030BA TDK CAP, CERM, 470 pF, 50 V, ± 10%, X7R, AEC-Q200 Grade 1, 0201 0201 9 C13 1 0.01 µF CGA1A2X7R1A103K030BA TDK CAP, CERM, 0.01 µF, 10 V, ± 10%, X7R, AEC-Q200 Grade 1, 0201 0201 10 C14 1 220 nF EWK107B7224MV-T Taiyo Yuden Multilayer Ceramic Capacitor 0.22 µF 20% 16 V X7R 0306 0306 11 C15 1 470 nF EWK107B7474MVHT Taiyo Yuden Multilayer Ceramic Capacitor 0.47 µF 20% 16 V X7R 0306 0306 12 H1, H3, H5, H7 4 1902C Keystone Standoff, Hex, 0.5"L #4-40 Nylon Standoff 13 H2, H4, H6, H8 4 NY PMS 440 0025 PH B&F Fastener Supply Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead Screw 14 J1, J2, J8 3 M50-1900005 Harwin 15 J3, J5, J7, J12 4 142-0701-851 Cinch Connectivity Connector, End launch SMA, 50 Ω, SMT SMA End Launch 16 J4, J6, J9 3 GRPB021VWVN-RC Sullins Connector Solutions Header, 50mil, 2x1, Gold, TH 2x1 Header 17 J10, J11 2 575-4 Keystone Standard Banana Jack, Uninsulated, 5.5 mm Keystone_575-4 18 L1 1 10 Ω BLM15AX100SN1D MuRata Ferrite Bead, 10 Ω at 100 MHz, 1.74 A, 0402 0402 19 R1, R7 2 0 CRCW04020000Z0EDHP Vishay-Dale RES, 0, 0%, 0.2 W, AEC-Q200 Grade 0, 0402 0402 20 R2, R6 2 49.9 RC0402FR-0749R9L Yageo America RES, 49.9, 1%, 0.063 W, 0402 0402 21 R5 1 4.02k CRCW04024K02FKED Vishay-Dale RES, 4.02 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 0402 22 TP1 1 5122 Keystone Test Point, Compact, Blue, TH Blue Compact Testpoint 23 TP2 1 5011 Keystone Test Point, Multipurpose, Black, TH Black Multipurpose Testpoint 24 U1 1 LMH34400 Texas Instruments LMH34400 SOT6 25 U2 1 LP5912-1.0DRVR Texas Instruments Linear Voltage Regulator IC Positive Fixed 1 Output 500 mA 6WSON WSON6 26 R3, R4 0 49.9 RC0402FR-0749R9L Yageo America RES, 49.9, 1%, 0.063 W, 0402 0402 27 R8 0 100 MCS0402MD1000BE100 Vishay/Beyschlag RES, 100, 0.1%, 0.1 W, AEC-Q200 Grade 0, 0402 0402 CONN_JUMPER_HDR2 SBOU265 – FEBRUARY 2022 Submit Document Feedback LMH34400 Evaluation Module Copyright © 2022 Texas Instruments Incorporated 7 IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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