Texas Instruments DRV632EVM User Manual
User's Guide
SLOU301–January 2010
DRV632EVM Evaluation Module
This user’s guide describes the operation of the DRV632 evaluation module. This document also provides
measurement data and design information including a schematic, bill of materials, and printed-circuit
board (PCB) layout drawings.
Contents
1 Overview ..................................................................................................................... 2
2 Quick Setup .................................................................................................................. 4
3 On/Off Sequence ............................................................................................................ 5
4 Component Selection ....................................................................................................... 5
5 Layout Recommendations ................................................................................................. 7
6 Related Documentation from Texas Instruments ....................................................................... 7
7 Design Documentation ..................................................................................................... 8
List of Figures
1 DRV632EVM Top View .................................................................................................... 2
2 DRV632EVM Bottom View ................................................................................................ 2
3 DRV632EVM Functional Block Diagram................................................................................. 3
4 Power-Up/-Down Sequence............................................................................................... 5
5 Second-Order, Active Low-Pass Filter ................................................................................... 6
6 Differential Input, Second-Order Active Low-Pass Filter............................................................... 6
7 DRV632EVM Schematic................................................................................................... 8
8 DRV632EVM PCB Component Placement ............................................................................ 10
9 DRV632EVM PCB Top Layer............................................................................................ 10
10 DRV632EVM PCB Bottom Layer........................................................................................ 11
1 Key Parameters............................................................................................................. 3
2 Recommended Supply Voltage ........................................................................................... 4
3 DRV632EVM Filter Specifications ........................................................................................ 6
4 Related Documentation .................................................................................................... 7
5 Bill of Materials.............................................................................................................. 9
DirectPath is a trademark of Texas Instruments.
Blu-ray Disc is a trademark of Blu-ray Disc Association.
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List of Tables
1
© 2010, Texas Instruments Incorporated
Overview
1 Overview
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Figure 1. DRV632EVM Top View
The DRV632EVM customer evaluation module (EVM) demonstrates the capabilities and operation of the
DRV632 integrated circuit from Texas Instruments.
The DRV632 is a 2-V
, pop-free, stereo line driver designed to allow removal of the output dc-blocking
RMS
capacitors in audio applications to 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 DirectPath™ technology, the DRV632 is able to drive 2 V
load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors
that support a gain range of ±1 V/V to ±10 V/V, and line outputs that have ±8 kV IEC electrostatic
discharge (ESD) protection. The DRV632 also has built-in shutdown control for pop-free, on/off control.
Using the DRV632 in audio product applications can reduce component counts considerably, compared to
traditional methods of generating a 2-V
than 3.3 V to generate its 5.6-VPPoutput, nor does it require a split-rail power supply. The DRV632
integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free,
ground-biased 2-V
2
DRV632EVM Evaluation Module SLOU301–January 2010
output. The DRV632 is available in a 14-pin TSSOP package.
RMS
Figure 2. DRV632EVM Bottom View
output. The DRV632 does not require a power supply greater
RMS
© 2010, Texas Instruments Incorporated
into a 10-kΩ
RMS
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+3.3 V
R_OUT
L_OUT
DRV632PW
R_IN
L_IN
ON/OFF
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This EVM is configured with two RCA phono input connectors for analog input; the output signal is
available on two RCA phono connectors. 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
Disc™ DVD players, DVD mini-component systems, home theater-in-a-box (HTIB) systems, or
soundcards.
This document presents EVM specifications, 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 available from the TI Web site at www.ti.com.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the DRV632EVM.
1.1 DRV632EVM Features
The DRV632EVM has these features:
• Two-channel evaluation module (double-sided, plated-through PCB layout)
• 2-V
• No output capacitor required
• Shutdown button
Figure 3 illustrates the functional diagram for the EVM. Table 1 summarizes the key parameters.
line output
RMS
Overview
Figure 3. DRV632EVM Functional Block Diagram
Number of Channels Two
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Table 1. Key Parameters
Key Parameters Specification/Unit
Supply Voltage 3.3 V
Load Impedance 600 Ω (min)
Output Voltage 2 V
Dynamic Range > 90 dB
RMS
© 2010, Texas Instruments Incorporated
3
Quick Setup
2 Quick Setup
This section describes the DRV632EVM board with regard to the power supply and system interfaces. It
provides information about handling and unpacking the DRV632EVM, absolute operating conditions, and a
description of the factory default switch and jumper configurations.
The following subsections provide a step-by-step guide to configuring the DRV632EVM for device
evaluation.
2.1 Electrostatic Discharge Notice
Many of the components on the DRV632EVM 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
On opening the DRV632EVM package, ensure that the following items are included:
• One DRV632EVM evaluation board, including:
– One DRV632PW device
If either item is missing, contact the Texas Instruments Product Information Center nearest you to inquire
about a replacement.
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CAUTION
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.
Description Voltage Limitations Current Requirement Cable
Power supply 3.3 V 0.10 A —
Applying voltages above the limitations given in Table 2 may cause permanent
damage to your hardware.
Table 2. Recommended Supply Voltage
CAUTION
4
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