VCA261XEVM

VCA261XEVM TI1 | Alldatasheet

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Technical content

SBOU015A – SEPTEMBER 2002 – REVISED AUGUST 2003 www.ti.com

DESCRIPTION

The VCA261xEVM is designed to provide ease of use in evaluating the performance of the VCA2611, VCA2612, VCA2613 and VCA2616 variable gain amplifier family.

FEATURES

z EASY TESTING OF VCA2611, VCA2612, VCA2613, VCA2616 z SINGLE-ENDED INPUT INTO LNA z SINGLE-ENDED TO DIFFERENTIAL INPUT VIA TRANSFORMERS FOR VCA z ADJUSTABLE GAIN RANGES PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2003, Texas Instruments Incorporated Actual Board Dimensions: 8.9cm x 6.2cm Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners.

SBOU015Awww.ti.com INITIAL CONFIGURATION By using simple slide and DIP-switches, the VCA261xEVM can be configured to accommodate several different modes of operation. Before using the evaluation board, the user should determine the configuration and required settings needed for their specific evaluation. The demonstration board comes from the factory with the following preset configura- tion: Slide Switches: SW1, SW3, SW5, and SW7 are set to position 2. SW2, SW4, SW6, and SW8 are set to position 1. JP1 and JP2 have connections made at position B. DIP-switch S1 has the following settings:

• MGS1 is set low
• MSG2 and MGS3 are set high
• VCAinSEL is set low
• FBSWcntl is set low Components C20 and C29 are not populated. POWER SUPPLY The VCA261xEVM requires ±5V supplies (Connector J7) for the output amplifiers (U1 and U3) and a separate +5V supply (Connector J4) for the VCA261x. This configuration allows for the monitoring of supply currents to the VCA261x inde- pendently of the rest of the evaluation board. If monitoring of the supplies is not required, a single +5V supply can be substituted by connecting the two separate +5V supplies (J4 and J7) together. In this case the –5V supply is still required. SIGNALS INPUT SIGNALS The input signals are applied to SMA connectors J3 and J6 for using the LNA and J2 and J8 for bypassing the LNA. The input signals should be provided from low impedance source. The inputs are ac-coupled into the LNA of the VCA261x through 0.01µF capacitors and through transformers into the VCA inputs. OUTPUT SIGNALS The outputs of the evaluation board are located at SMA connectors J1 and J9. When testing the EVM board, the outputs J1 and J9 should be terminated into 50Ω 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. OUTPUT CONFIGURATION By utilizing the switches provided at the inputs to amplifiers U1 and U3, the outputs of the VCA261x can be monitored on SMA connectors J1 and J9. Amplifiers U1 and U3 are configured to have a gain of 1/2 in all modes except where the signals are terminated to ground through a 500Ω equiva- lent resistance. Table I shows the switch positions and the resulting output. NO OUTPUT AT J5 SINGLE-ENDED SINGLE-ENDED AND J6 (output at NONINVERTING INVERTING DIFFERENCE (1) test points) SW1 1 2 2 1 SW3 2 1 2 1 SW2 1 2 2 1 SW4 2 1 2 1 NOTE: (1) Denotes Factory Preset. TABLE I. Output Configuration. MGS ATTENUATOR GAIN DIFFERENTIAL ATTENUATOR + SETTING VCA CNTL = 0V to 3V PGA GAIN DIFF . PGA GAIN 000 –24dB to 0dB 24dB 0dB to 24dB 001 –27dB to 0dB 27dB 0dB to 27dB 010 –30dB to 0dB 30dB 0dB to 30dB 011 –33dB to 0dB 33dB 0dB to 33dB 100 –36dB to 0dB 36dB 0dB to 36dB 101 –39dB to 0dB 39dB 0dB to 39dB 110 –42dB to 0dB 42dB 0dB to 42dB 111 –45dB to 0dB 45dB 0dB to 45dB TABLE II. MGS Settings. The outputs of the VCA261x can be terminated through 500Ω on each output, and the output signals can then be observed at test points TP1 and TP2 and test points TP3 and TP4, respectively. SWITCHES The five dip-switches (S1) control the gain range bits (MGS1, MGS2, and MGS3) of the PGA, the input selection (VCA IN SEL) to select between input into the LNA or into the VCA, and the feedback select switch to enable the switched- feedback configuration. Table II shows the MGS settings and the corresponding gain ranges. LNA There are two sets of solder switches (JP1 and JP2) that enable setting the LNA gain. The following table outlines the gain settings for the LNA and the corresponding switch connections.

www.ti.com 6 0.01µF C4, C12, C19 805 Multilayer Ceramic—0805 Size C0805C103J4RAC Kemet C22, C27, C32 8 0.1µF C1, C14, C16, 805 Multilayer Ceramic—0805 Size C0805C104J4RAC Kemet C18, C21, C30, C33, C35 5 1µF C25, C26, C28 3216 Low Profile Tantalum Capacitor T491A105M016AS Kemet C23, C31 4 2.2µF C15, C17, 3216 Low Profile Tantalum Capacitor T491A225M016AS Kemet C36, C37 2 4.7pF C5, C10 805 Multilayer Ceramic—0805 Size C0805C479D3GAC Kemet 5 10k R15, R16, 805 1/10W 0805 Chip Resistor R17, R18, R19 3 10µF C24, C34, C38 3528 Low Profile Tantalum Capacitor T491B106M016AS Kemet 2 49.9 R1, R14 805 1/10W 0805 Chip Resistor CRCW080549R9F Dale 2 56pF C3, C13 805 Multilayer Ceramic—0805 Size C0805C560J3GAC Kemet 4 169 R3, R4, R11, R12 805 1/10W 0805 Chip Resistor Dale 2 250 R2, R13 805 1/10W 0805 Chip Resistor CRCW08052500F Dale 4 330pF C6, C7, C8, C9 805 Multilayer Ceramic—0805 Size C0805C331K3GAC Kemet 2 332 R6, R10 805 1/10W 0805 Chip Resistor CRCW08053320F Dale 2 499 R5, R9 805 1/10W 0805 Chip Resistor CRCW08054990F Dale 2 549 R7, R8 805 1/10W 0805 Chip Resistor CRCW08055490F Dale 2 1nF C2, C11 805 Multilayer Ceramic—0805 Size C0805C102K3GAC Kemet

1 CON_2TERM_SCREW J4 2P-TERM 2 Terminal Screw Connector ED-1514-ND Digi-Key

1 CON_3TERM_SCREW J7 3P-TERM 3 Terminal Screw Connector ED-1515-ND Digi-Key

2 Not Installed C20, C29 805 Multilayer Ceramic—0805 Size

2 OPA642N U1, U3 SOT25 High-Speed, Low THD Op Amp OPA642N TI

7 SMA_PCB_MT_MOD J1, J2, J3 SMA_JACK SMA_JACK_STRAIGHT 142-0701-231 Johnson

J5, J6, J8, J9

8 SPDT_SLIDE SW1-SW8 SPDT_SLIDE_500MIL C&K/TS01-C-K-E EG-1903-ND Digi-Key

1 SW DIP-5 S1 5_SPST_DIP_SW DIP Switch CKN3004-ND Digi-Key

2 T1-1T-KK81_XFMR T1, T2 MC_KK81 RF Transformer MINI-Circuits T1-1T T1-1T-KK81 MINI-Circuits

1 VCA261x U2 48-TQFP(PFB) Voltage Controlled Amplifier VCA261x TI

USED PART TYPE DESIGNATOR FOOTPRINT DESCRIPTION PART NUMBER MFG TABLE III. Schematic Parts List.

2 JP2

FIGURE 1. Schematic.

www.ti.com 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: T exas Instruments Post Office Box 655303 Dallas, T exas 75265 Copyright 2003, T exas Instruments Incorporated

SBOU015Awww.ti.com 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 60°C. The EVM is designed to operate properly with certain components above 60°C 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: T exas Instruments Post Office Box 655303 Dallas, T exas 75265 Copyright 2003, T exas Instruments Incorporated

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applications

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