User's Guide August 2003 SBOU020A IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. 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Following are URLs where you can obtain information on other Texas Instruments products & application solutions: Products Applications Amplifiers amplifier.ti.com Audio www.ti.com/audio Data Converters dataconverter.ti.com Automotive www.ti.com/automotive DSP dsp.ti.com Broadband www.ti.com/broadband Interface interface.ti.com Digital Control www.ti.com/digitalcontrol Logic logic.ti.com Military www.ti.com/military Power Mgmt power.ti.com Optical Networking www.ti.com/opticalnetwork Microcontrollers microcontroller.ti.com Security www.ti.com/security Telephony www.ti.com/telephony Video & Imaging www.ti.com/video Wireless www.ti.com/wireless Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2003, Texas Instruments Incorporated EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may not meet the technical requirements of the directive. Should this evaluation kit not meet the specifications indicated in the EVM User's Guide, 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 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. Please be aware that the products received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). 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. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the EVM User's Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM User's Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact the TI application engineer. Persons handling the product must have electronics training and observe good laboratory practice standards. 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. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2003, Texas Instruments Incorporated EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the specified input and output ranges described in the EVM User's Guide. 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 60C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2003, Texas Instruments Incorporated VCA2614/18/19EVM The VCA2614/18/19EVM is designed to provide ease of use in evaluating the performance of the VCA2614, VCA2618 or VCA2619 variable gain amplifier. Topic Page 1.1 Initial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.5 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.6 User-Selectable Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.7 Schematic and PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.8 Component List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 VCA2614/18/19EVM 1 Initial Configuration 1.1 Initial Configuration By using simple slide switches and DIP switches, the VCA2614/18/19EVM can be configured to accommodate several different modes of operation. Before using the evaluation board, each user should determine the configuration and setting needed for the specific evaluation. The demonstration board comes from the factory with the following factory settings: - Switches SW1, SW2, SW3, and SW4 are all set to positions 2-3. (See Table 1.) - DIP-switch S1 has the following settings: J MGS1, MGS2, and MGS3 are set to the off position. J /PD is set to off position. - Components C9 and C16 are not populated. 1.2 Power Supply The VCA2614/18/19EVM requires +5V supplies (connector J4) for the output amplifiers (U2 and U3) and a separate +5V supply (connector J1) for the VCA2614/18/19. This configuration allows for the monitoring of supply currents to the VCA2614/18/19 independent of the rest of the evaluation board. If monitoring of the supplies is not required, a single +5V supply can be substituted for the two separate +5V supplies. In this case, the -5V supply is still required. 2 Signals 1.3 Signals 1.3.1 Input Signals The input signals are applied to SMA connectors J2 and J3. The input signals should be provided from a low impedance source. The inputs are ac coupled into the VCA2614/18/19 through 0.01F capacitors. 1.3.2 VCACNTL The gain control signal is applied to the input SMA connector J7. This can be a dc voltage or a customer-specific waveform. The source for the control input should also be low impedance. The range for the control voltage, as specified in the VCA2614, VCA2618, or VCA2619 data sheet, is from 0.2V to 3V. 1.3.3 Output Signals The outputs of the evaluation board are located at SMA connectors J5 and J6. When testing the EVM board, the outputs J5 and J6 should be terminated into 50 loads such as that of the inputs to a spectrum analyzer. This will result in a 6dB loss of the signal magnitude. This loss should be taken into account when taking all measurements. 1.4 Output Configuration By utilizing the switches provided at the inputs to amplifiers U2 and U3, the outputs of the VCA2614/18/19 can be monitored on SMA connectors J5 and J6. Amplifiers U2 and U3 are configured to have a gain of 1/2 in all modes except where the signals are terminated to ground through a 500 equivalent resistance. Table 1 lists the switch combinations and the resulting output: Table 1. VCA2614/18/19 Switch Combinations Single-Ended Single-Ended Noninverting Inverting Difference(1) No Output at J5 and J6 (output at test points) U2 SW1 1-2 2-3 2-3 1-2 SW3 2-3 1-2 2-3 1-2 SW2 1-2 2-3 2-3 1-2 SW4 2-3 1-2 2-3 1-2 U3 1) Denotes factory preset. The outputs of the VCA2614/18/19 can be terminated through 500 on each output and the output signals can then be observed at test points TP1 and TP4 and test points TP2 and TP3 respectively. VCA2614/18/19EVM 3 Switches 1.5 Switches The four dip switches (S1) control the gain range bits (MGS1, MGS2, and MGS3) of the PGA and the power down (PD) function of the VCA2614/18/19. Table 2, Table 3 and Table 4 show the MGS settings and the corresponding gain ranges for each device. Table 2. Table 3. Table 4. 4 MGS Settings for the VCA2614 MGS Setting Attenuator Gain VCACNTL = 0.02V to 3V Attenuator + Differential PGA Gain 000 Not valid Not valid 001 -24.1dB to 0dB 2.6dB to 26.7dB 010 -26.9dB to 0dB 2.6dB to 29.5dB 011 -29.5dB to 0dB 3.0dB to 35.6dB 100 -32.4dB to 0dB 3.1dB to 35.5dB 101 -34.8dB to 0dB 3.4dB to 38.3dB 110 -37.3dB to 0dB 3.7dB to 44.1dB 111 -40.0dB to 0dB 4.1dB to 44.2dB MGS Setting Attenuator Gain VCACNTL = 0V to 3V Attenuator + Differential PGA Gain 000 Not valid Not valid 001 -27dB to 0dB 0dB to 27dB 010 -30dB to 0dB 0dB to 30dB 011 -33dB to 0dB 0dB to 33dB 100 -36dB to 0dB 0dB to 36dB 101 -39dB to 0dB 0dB to 39dB 110 -42dB to 0dB 0dB to 42dB 111 -45dB to 0dB 0dB to 45dB MGS Setting Attenuator Gain VCACNTL = 0.2V to 3V Attenuator + Differential PGA Gain 000 Not valid Not valid 001 Not valid Not valid 010 -41.0dB to 0dB -12dB to 29dB 011 -43.3dB to 0dB -11.5dB to 31.8dB 100 -46.4dB to 0dB -11.5dB to 34.9dB 101 -48.2dB to 0dB -10.6dB to 37.6dB 110 -50.2dB to 0dB -9.8dB to 40.4dB 111 -52.3dB to 0dB -9.3dB to 43.3dB MGS Settings for the VCA2618 MGS Settings for the VCA2619 User-Selectable Capacitors 1.6 User-Selectable Capacitors Capacitors C9 and C16 are user-selectable and optional. Placing an external capacitor at these positions will lower the low frequency bandwidth of the VCA2614/18/19. The following equation is used to calculate the low frequency cutoff: f (low*3dB) + 2 p 500kW 1 (220pF ) C EXTERNAL) Care must be taken not to select too large a value because the charging time may exceed the time constant set by the input coupling capacitors, thus causing a longer-than-expected power-on delay. Please refer to the Input Buffer section of the VCA2614, VCA2618 or VCA2619 data sheet, located at www.ti.com, for further details. VCA2614/18/19EVM 5 1 2 -5V + C10 10 uF + C1 10 uF +5V 2 J1 1 Output Channel A + C2 10 uF +5DUT J6 Output Channel B J5 1 1 0.1uF C18 1 uF C8 + +5DUT 0.1uF C21 49.9 1 uF C7 + R3 49.9 Input Channel B 0.1uF C6 Input Channel A R6 J3 J2 0.1uF C5 U3 C17 0.1uF C15 C24 -5V U2 C25 0.1uF 2.2uF 1 1 uF C4 + 1 250 R5 2.2uF +5V C13 0.1uF C14 OPA642N 1 -5V C27 0.1uF 2.2uF OPA642N 1 C26 + 250 R4 2.2uF +5V 0.01 uF C12 4 3 - + 4 3 0.01 uF C11 0.1uF C3 - + R9 R15 499 R2 +IN b NC GNDr V cm V bias V ddr NC +IN a R10 R16 User Select C16 8 7 6 5 4 3 2 1 User Select C9 SW2 332 R8 SW4 169 3 5 4 3 2 5 4 3 2 1 + 5 4 3 2 5 4 3 2 + 169 2 2 2 V- V+ 5 2 V- V+ 5 3 3 3 3 499 R1 SW1 332 R7 SW3 32 C22 330 pF C23 330 pF +5DUT NC NC 9 30 1 169 1 1 2 2 169 31 NC NC 10 1 uF C31 29 0.1uF C30 TP1 TP4 Cp2a C20 330 pF C19 330 pF 1 uF C29 + +5DUT 11 C P2B 28 Cp1a 12 Vdda C28 TP3 TP2 0.1uF 13 C P1B 26 V ddb 27 GNDa GND b 14 P out a 25 N out a P out b 15 N out b 16 24 17 18 19 20 21 22 23 VCA2614/18/19 NC NC NC PD MGS1 MGS2 MGS3 VCA cntl U1 1 J7 R11 R12 R13 R14 10k 10k 10k 10k +5V MGS Switches S1 SW-DIP4 GainControl Input 2 3 4 5 8 7 6 5 + 1 2 3 4 6 + J4 Schematic and PCB 1.7 Schematic and PCB Figure 1. VCA2614/18/19EVM Schematic Schematic and PCB Figure 2. VCA2614/18/19EVM PCB Top Layer Figure 3. VCA2614/18/19EVM PCB Ground Layer VCA2614/18/19EVM 7 Schematic and PCB Figure 4. VCA2614/18/19EVM PCB Power Layer Figure 5. VCA2614/18/19EVM PCB Bottom Layer 8 1) 10F 49.9 169 250 330pF 332 499 CON_2TERM_SCREW CON_3TERM_SCREW OPA642N (OPA842) SMA_PCB_MT_MOD 3 2 4 2 4 2 2 1 1 2 5 Not populated on board. Optional component. VCA2614 VCA2618 VCA2619 1 U1 S1 C9, C16 SW-DIP4 User Select(1) 2 SW1, SW2, SW3, SW4 J2, J3, J5, J6, J7 U2, U3 J4 J1 R1, R2 R7, R8 C19, C20, C22, C23 R4, R5 R9, R10, R15, R16 R3, R6 C1, C2, C10 R11, R12, R13, R14 C14, C15, C24, C26 C4, C7, C8, C29, C31 C11, C12 C3, C5, C6, C13, C17, C18, C21, C25, C27, C28, C30 Designator 1 SPDT_SLIDE 10k 4 4 1F 2.2F 0.01F 2 4 0.1F 11 5 Part Type Component List Qty Table 5. 1.8 Component List 32-TQFP 805 4POS_SPST_DIP SPDT_SLIDE SMA_JACK_RIGHT_ANGLE SOT23-5 3P-TERM 2P-TERM 805 805 805 805 805 805 3528 805 3216 3216 805 805 Footprint TI -- Digi-Key Digi-Key Johnson TI Digi-Key Digi-Key Dale Dale Kemet Dale Dale Dale Kemet Dale Kemet Kemet Kemet Kemet Mfg VCA2614Y VCA2618Y VCA2619Y User Select A5204-ND EG-1903-ND 142-0801-301 OPA642N ED-1515-ND ED-1514-ND CRCW08054990F CRCW08053320F C0805C331K3GAC CRCW08052490F CRCW08051690F CRCW080549R9F T491B106M016AS CRCW0805103F T491A225M016AS T491A105M016AS C0805C103K5RAC C0805C104M5UAC Part Number Voltage Controlled Amplifier Multilayer Ceramic - 0805 Size 4 Position SPST Dip Switch C&K / TS01-C-K-E Right-angle SMA High-Speed, Low THD Op Amp 3 Terminal Screw Connector 2 Terminal Screw Connector 1/10W 0805 Chip Resistor 1/10W 0805 Chip Resistor Multilayer Ceramic - 0805 Size 1/10W 0805 Chip Resistor 1/10W 0805 Chip Resistor 1/10W 0805 Chip Resistor Low Profile Tantalum Capacitor 1/10W 0805 Chip Resistor Low Profile Tantalum Capacitor Low Profile Tantalum Capacitor Multilayer Ceramic - 0805 Size Multilayer ceramic - 0805 size Description Component List VCA2614/18/19EVM 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments: VCA2619EVM VCA2618EVM VCA2614EVM