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User's Guide

SBOU033 – November 2005

VCA2617EVM User's Guide

This document provides the information needed to set up and operate the

VCA2617EVM evaluation module (EVM). For a more detailed description of the

VCA2617 , please refer to the product datasheet available from the Texas Instruments

web site at http://www.ti.com . Throughout this document, the acronym EVM and the

phrase evaluation module are synonymous with the VCA2617EVM. This user's guide

includes setup and configuration instructions, information regarding operating

procedures and input/output connections, an electrical schematic, printed circuit board

(PCB) layout drawings, and a parts list for the EVM.

Contents

1 Description ........................................................................................... 2

2 Power Supply Requirements ...................................................................... 2

3 Input Signals ........................................................................................ 2

4 VCA Control Voltage (V

CNTL

) ...................................................................... 2

5 Output Configuration ............................................................................... 2

6 Clamping Voltage ................................................................................... 3

7 Switch Settings ...................................................................................... 3

8 Physical Description ................................................................................ 3

List of Figures

1 Switch SW1 Settings .............................................................................. 3

2 VCA2617EVM Schematic ......................................................................... 4

3 VCA2617EVM PCB Top Layer (Top View) ..................................................... 5

4 VCA2617EVM PCB Power Layer (Top View) .................................................. 6

5 VCA2617EVM PCB Ground Layer (Top View) ................................................. 7

6 VCA2617EVM PCB Bottom Layer (Bottom View) .............................................. 8

List of Tables

1 Switch SW1 Summary ............................................................................. 3

2 VCA2617EVM Parts List ........................................................................... 9

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SBOU033 – November 2005 VCA2617EVM User's Guide 1

Summary of content (11 pages)

PAGE 1
User's Guide SBOU033 – November 2005 VCA2617EVM User's Guide This document provides the information needed to set up and operate the VCA2617EVM evaluation module (EVM). For a more detailed description of the VCA2617, please refer to the product datasheet available from the Texas Instruments web site at http://www.ti.com. Throughout this document, the acronym EVM and the phrase evaluation module are synonymous with the VCA2617EVM.
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www.ti.com Description 1 Description The VCA2617EVM is designed to provide ease of use in evaluating the performance of the VCA2617 variable gain amplifier. By using the 0Ω jumpers and DIP-switches, the VCA2617EVM can be configured to accommodate several different modes of operation. Before starting the evaluation, it is recommended to review the state of each of the switches to verify the desired configuration.
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www.ti.com Clamping Voltage 6 Clamping Voltage The VCA2617 allows for a user to limit the output voltage swing to a defined level. For this configuration, the desired clamping voltage level is applied to the VCLMPA and VCLMPB pins of the VCA2617. The EVM includes a 3.3V reference (U3) that supplies a stable voltage. Using potentiometer RP1, the clamping voltage can be adjusted to the desired value. 7 Switch Settings Use switch SW1 to control the post-gain and power-down functions of the VCA2617.
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JP1 1 2 J5 OUT A Vcntrl 10 uF 0.1uF C21 DUT 49.9 R1 +5DUT + C25 2.2uF J1 NIN A 249 R7 C23 0.1uF U1 1 C22 0.1uF 1 2 3 3 1 3 4 T1 OPA842 +5V J3 PIN A - + -5V -5V + C31 10 uF 10 uF + C30 +5V R3 169 T1-1T R22 0 C11 6 0.01uF 5 4 R11 499 TP1 TP2 R20 0 SJP1 0.01uF C2 0.01uF C1 SJP3 29 32 31 30 3.9uF 0.1uF C28 28 27 26 25 V_ClampB V_ClampA C9 +5DUT C6 0.01 uF C5 0.
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www.ti.com Physical Description Figure 3.
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www.ti.com Physical Description Figure 4.
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www.ti.com Physical Description Figure 5.
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www.ti.com Physical Description Figure 6.
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www.ti.com Physical Description 8.2 Parts List The Parts List, showing the components used in the assembly of the VCA2617EVM, is given in Table 2. Table 2. VCA2617EVM Parts List Designator Value Quantity Description Footprint Part Number C1–C8, C11, C15 0.01µF 10 Ceramic 0603 399-1092-1-ND C9, C10, C12, C13, C16–C23 0.1µF 12 Ceramic 0603 399-1282-1-ND 399-1284-1-ND C14 1.0µF 1 Ceramic 0805 C24–C26 2.2µF 3 Low Profile Tantalum Capacitor 3216/A 399-1257-1-ND C27, C28 3.
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www.ti.com Physical Description FCC Warnings This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference.
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