User's Guide SLOU307 - January 2011 DRV612EVM This user's guide describes the operation of the DRV612 evaluation module. This document provides design information including a schematic, bill of materials, and printed circuit board (PCB) layout drawings. 1 2 3 4 5 Contents Overview ..................................................................................................................... 1.1 DRV612EVM Features ............................................................................................ Quick Setup .................................................................................................................. 2.1 Electrostatic Discharge Notice ................................................................................... 2.2 Unpacking the EVM ................................................................................................ 2.3 Power Supply Setup ............................................................................................... Component Selection ....................................................................................................... 3.1 Charge Pump ....................................................................................................... 3.2 Power-Supply Decoupling Capacitors ........................................................................... Layout Recommendations ................................................................................................. 4.1 PGND and GND Connections .................................................................................... Design Documentation ..................................................................................................... 5.1 Schematic and PCB Layout ...................................................................................... 5.2 Parts List ............................................................................................................ 5.3 PCB Specification .................................................................................................. 5.4 PCB Layers ......................................................................................................... 3 3 4 4 4 4 5 5 5 5 5 6 6 7 8 8 List of Figures 1 DRV612EVM - Top View ................................................................................................... 2 2 DRV612EVM - Bottom View ............................................................................................... 2 3 DRV612EVM Functional Block Diagram ................................................................................. 3 4 Power-Up/-Down Sequence 5 6 .............................................................................................. DRV612EVM Schematic: DRV612 ...................................................................................... DRV612EVM PCB Layout ................................................................................................. 5 6 7 List of Tables 1 Key Parameters ............................................................................................................. 4 2 Recommended Supply Voltage 3 Bill of Materials .............................................................................................................. 7 4 PCB Specification ........................................................................................................... 8 .......................................................................................... 4 DirectPath is a trademark of Texas Instruments. Blu-ray Disc is a trademark of Blu-ray Disc. SLOU307 - January 2011 Submit Documentation Feedback DRV612EVM (c) 2011, Texas Instruments Incorporated 1 www.ti.com Figure 1. DRV612EVM - Top View spacer spacer Figure 2. DRV612EVM - Bottom View 2 DRV612EVM SLOU307 - January 2011 Submit Documentation Feedback (c) 2011, Texas Instruments Incorporated Overview www.ti.com 1 Overview The DRV612EVM customer evaluation module (EVM) demonstrates the capabilities and operation of the DRV612 integrated circuit from Texas Instruments. The DRV612 is a 2-VRMS pop-free stereo line driver designed to allow removal of the output dc-blocking capacitors and combined with the internal programmable gain resistors reduce component count and overall cost. The device is ideal for single-supply electronics where size and cost are critical design parameters. Designed using TI's patented DirectPathTM technology, the DRV612 is capable of driving 2 VRMS into a 600 load. The device has fixed-gain single-ended inputs with a gain select pin. Line outputs have 8kV HBM ESD protection enabling and a simple ESD protection circuit. The DRV612 has built-in active mode control with more than 80 dB attenuation for pop-free mute on/off control. The DRV612 does not require a power supply greater than 3.3V to generate its 5.6Vpp output, nor does it require a split rail power supply. The DRV612 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground biased 2Vrms output. The DRV612 is available in a 14-pin TSSOP package. This EVM is configured with RCA stereo connectors for analog input and stereo output; The power supply is connected via a two-pin, 2.54-mm header. This evaluation board is designed for testing applications such as set-top boxes, LCD/PDP TVs, Blu-ray DiscTM DVD players, DVD mini-component systems, home theater-in-a-box (HTIB) systems, or soundcards. NOTE: This documnet presents EVM specificatins, audio performance measurements graphs, and design documentation that includes complete circuit descriptions, schematic diagrams, a parts list, and PCB layout design. Gerber (layout) files are availabe from the TI web site at http://www.ti.com. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the DRV612EVM. 1.1 DRV612EVM Features The DRV612EVM has these features: * Two-channel evaluation module (double-sided, plated-through PCB layout) * 2-VRMS stereo line output * Single-ended analog inputs * No output capacitor required * Mute button Figure 3 illustrates the functional diagram for the EVM. Table 1 summarizes the key parameters. +3.3V ROUT RIN DRV612 LOUT LIN MUTE Figure 3. DRV612EVM Functional Block Diagram SLOU307 - January 2011 Submit Documentation Feedback DRV612EVM (c) 2011, Texas Instruments Incorporated 3 Quick Setup www.ti.com Table 1. Key Parameters 2 Key Parameters Specification/Unit Supply Voltage 3.3 V Number of channels Two Load Impedance 600 Output Voltage 2 Vrms Dynamic Range 105 dB Quick Setup This section describes the DRV612EVM board with regards to the power supply and system interfaces. It provides information about handling and unpacking the DRV612EVM, absolute operating conditions, and a description of the factory default configurations. The following subsections provide a step-by-step guide to configuring the DRV612EVM for device evaluation. 2.1 Electrostatic Discharge Notice CAUTION Many of the components on the DRV612EVM are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation. Failure to observe proper ESD handling procedures may result in damage to EVM components. 2.2 Unpacking the EVM Upon opening the DRV612EVM package, ensure that the following items are included: * One DRV612EVM evaluation board, including: - One DRV612PW device If either item is missing, please contact the Texas Instruments Product Information Center nearest you to inquire about a replacement. 2.3 Power Supply Setup A single power supply is required to power up the EVM. The power supply is connected to the EVM board using a two-pin, 2.54-mm header (J1). Table 2 lists the recommended supply voltage. Table 2. Recommended Supply Voltage Description Voltage Limitations Current Requirement Cable Power supply 3.3 V 0.10 A -- CAUTION Applying voltages above the limitations given in Table 2 may cause permanent damage to your hardware. 4 DRV612EVM SLOU307 - January 2011 Submit Documentation Feedback (c) 2011, Texas Instruments Incorporated Component Selection www.ti.com 2.3.1 Pop-Free Power Up Pop-free power up is ensured by keeping the MUTE low during power supply ramp up and down. The pins should be kept low until the input AC-coupling capacitors are fully charged before asserting the MUTE pin high, this way proper pre-charge of the ac-coupling is performed and pop-less power-up is achieved. Figure 4 illustrates the preferred sequence. Supply Supply ramp MUTE Time for ac - coupling capacitors to charge Figure 4. Power-Up/-Down Sequence 3 Component Selection 3.1 Charge Pump The charge pump flying capacitor, C6, serves to transfer charge during the generation of the negative supply voltage. The PVSS capacitor must be at least equal to the charge pump capacitor in order to allow a maximum charge transfer. Low equivalent series resistance (ESR) capacitors are an ideal selection, with a typical value of 1 mF. Capacitor values less than 1 mF can be used, but the maximum output can be reduced. It is therefore recommended to validate the design with thorough testing. 3.2 Power-Supply Decoupling Capacitors The DRV612 is a DirectPathTM line driver amplifier that requires adequate power-supply decoupling to ensure that noise and total harmonic distortion (THD) are low. A good low ESR ceramic capacitor, C5 (1 mF typical), placed as close as possible to the device PvDD leads is the best option. Placing this decoupling capacitor close to the DRV612 device is important for amplifier performance. For filtering lower-frequency noise signals, a 10-mF or greater capacitor placed near the audio amplifier may also help, but is not required in most applications because of the high PSRR of the DRV612. The charge pump circuit does apply ripple current on the PVDD line, and an LC or RC filter may be needed if noise-sensitive audio devices share the PVDD supply. 4 Layout Recommendations 4.1 PGND and GND Connections The PGND and GND pins of the DRV612 must be routed separately back to the decoupling capacitor in order to facilitate proper device operation. On the DRV612EVM, a star ground routing pattern is used; the star point is located directly below the DRV612 device itself. SLOU307 - January 2011 Submit Documentation Feedback DRV612EVM (c) 2011, Texas Instruments Incorporated 5 GND RCA (Red) 1 GND 100K 0603 RIN DRV612EVM (c) 2011, Texas Instruments Incorporated 2 C2 2.2ufd/50V VSA C3 2.2ufd/50V VSA U1 TSSOP14-PW GND S1 GND 100pfd/50V 0603 C4 10K 0603 R4 +3.3V Orange 1 14 -IN_R 49.9K 1/8W 0805 R5 DRV612PW GND DUAL FOOTPRINT PADS SMD-VSA ELECTROLYTIC / CERAMIC 1206 LIN-IN_L GND 100K 0603 R3 MUTE LINE DRIVER LIN RCA (Left) 3 1 GND 330 0603 R1 2 13 4 11 OUT_L GND 3 12 GND OUT_R GND C5 5 10 1.0ufd/16V 0603 7 8 GND 1.0ufd/16V 0603 C7 6 9 R6 R7 33.0 0603 CN CP 33.0 0603 LOUT 1.0ufd/16V 0603 C6 ROUT C8 1000pfd/50V 0603 C9 1000pfd/50V 0603 GND GND GND 1 1 3 2 2 3 LOUT RCA(Black) RCA (Red) ROUT LINE OUT Schematic and PCB Layout 3 2 R2 10ufd/10V 0805 C1 +3.3V 5.1 RIN 2 Green 0805 LED1 Design Documentation LINE DRIVER IN J1 1 +3.3V + 6 +3.3V 5 + POWER SUPPLY IN Design Documentation www.ti.com Figure 5. DRV612EVM Schematic: DRV612 SLOU307 - January 2011 Submit Documentation Feedback Design Documentation www.ti.com Figure 6. DRV612EVM PCB Layout 5.2 Parts List The bill of materials (BOM) for the DRV612EVM is listed in Table 3. Table 3. Bill of Materials Qty Part Reference Description Manufacturer Mfr Part No 1 U1 DIRECTPATH 2V LINE DRIVER/ FIXED GAIN 14-pin HTSSOP PW ROHS TEXAS INSTRUMENTS DRV612PW 1 LED1 LED, GREEN 2.0V SMD0805 ROHS LUMEX OPTO SML-LXT0805GW-TR 2 C8, C9 CAP SMD0603 CERM 1000PFD 50V 5% COG ROHS TDK CORP. C1608C0G1H102J 1 C4 CAP SMD0603 CERM 100PFD 50V 5% COG ROHS MURATA GRM1885C1H101JA01D 2 C2, C3 CAP ALUM-ELECT SMD-VSA 2.2UFD 50V 20% ROHS PANASONIC EEE-1HS2R2SR 3 C5, C6, C7 CAP SMD0603 CERM 1.0UFD 16V 10% X7R ROHS TDK C1608X7R1C105K 1 C1 CAP SMD0805 CERM 10UFD 10V10% X7R ROHS MURATA GRM21BR71A106KE51L 2 R6, R7 RESISTOR SMD0603 33.0 OHMS 1% 1/10W ROHS PANASONIC ERJ-3EKF33R0 1 R1 RESISTOR SMD0603 330 OHMS 5% 1/10W ROHS PANASONIC ERJ-3GEYJ331V 1 R4 RESISTOR SMD0603 10K 5% 1/10W ROHS PANASONIC ERJ-3GEYJ103V 1 R5 RESISTOR SMD0805 49.9K OHMS 1% 1/8W THICK FILM ROHS VISHAY CRCW080549K9FKEA 2 R2, R3 RESISTOR SMD0603 100K OHM 5% THICK FILM 1/10W ROHS PANASONIC CRCW06031K02FKTA-ND 1 J1 HEADER THRU MALE 2 PIN 100LS GOLD ROHS SULLINS PBC02SAAN 2 LIN, LOUT JACK, RCA 3-PIN PCB-RA BLACK ROHS SWITCHCRAFT PJRAN1X1U01X 2 RIN, ROUT JACK, RCA 3-PIN PCB-RA RED ROHS SWITCHCRAFT PJRAN1X1U03X 1 MUTE PC TESTPOINT, ORANGE, ROHS KEYSTONE ELECTRONICS 5003 1 S1 SWITCH, MOM, 160G SMT 4X3MM ROHS E-SWITCH TL1015AF160QG 4 NA STANDOFF,4-40,0.5INx3/16IN,ALUM RND F-F KEYSTONE ELECTRONICS 2027 4 NA 4-40 SCREW, STEEL 0.250 IN BUILDING FASTENERS PMS 440 0025 PH SLOU307 - January 2011 Submit Documentation Feedback DRV612EVM (c) 2011, Texas Instruments Incorporated 7 Design Documentation 5.3 www.ti.com PCB Specification Table 4 summarizes the specifications for the evaluation board PCB. Table 4. PCB Specification Board Identification 5.4 A852-PCB-001 (2.00) Board type Double-sided plated-through board Laminate type FR4 Laminate thickness 1,0 mm Copper thickness 35 m (including plating exterior layers) Copper plating of holes >25 m Minimum hole diameter 0.3 mm Silkscreen, component side White; remove silkscreen from solder and pre-tinned areas Silkscreen, component side None Soldermask, component side Green Soldermask, solder side Green Protective coating Solder coating and chemical silver on free copper Electrical test PCB must be electrically tested Manufactured to PERFAG 2E (http://www.perfag.dk) Aperture table PERFAG 10A (http://www.perfag.dk) Board dimensions 60 mm x 90 mm PCB Layers Gerber files are available for download at the DRV612EVM product folder page on the TI web site. Component placement and board layout are illustrated in Figure 6. NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing DRV612EVM PCBs. 8 DRV612EVM SLOU307 - January 2011 Submit Documentation Feedback (c) 2011, Texas Instruments Incorporated Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User's Guide, the board/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 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. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. 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No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM Warnings and Restrictions It is important to operate this EVM within the input voltage range of 0 V to 3 V and the output voltage range of 0 V to 3.3 V . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 60C. The EVM is designed to operate properly with certain components above 40C as long as the input and output ranges are maintained. 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