Texas Instruments DRV600EVM Manuale utente

User's GuideSLOU205 – July 2007

DRV600EVM User's Guide

This user’s guide describes the operation and configuration of the evaluation module (EVM) for theDRV600 stereo line driver. The document also provides measurement data and design information,including a schematic, bill of materials, and layout figures.

Contents1 Overview ...................................................................................................................... 22 Quick Setup Guide........................................................................................................... 43 Shutdown ..................................................................................................................... 54 DRV600EVM Performance ................................................................................................. 65 Related Documentation from Texas Instruments ...................................................................... 116 Design Documentation .................................................................................................... 12

List of Figures

1 DRV600EVM ................................................................................................................. 22 DRV600 Functional Block Diagram ....................................................................................... 33 DRV600EVM Physical Structure ........................................................................................... 44 Recommended Power-Up/-Down Sequence ............................................................................. 55 THD+N vs Voltage (600 Ωload) ............................................................................................ 76 THD+N vs Voltage (100k Ωload) .......................................................................................... 77 THD+N vs Frequency (600 Ωload) ........................................................................................ 78 THD+N vs Frequency (600 Ωload) Using X7R Input Caps ............................................................ 89 FFT Spectrum with –60dBFS Tone ....................................................................................... 810 Idle Noise FFT Spectrum ................................................................................................... 911 Channel Separation ......................................................................................................... 912 Frequency Response ...................................................................................................... 1013 Phase Response ........................................................................................................... 1014 Pop/Click (Enable) ......................................................................................................... 1115 Pop/Click (Disable) ......................................................................................................... 1116 DRV600EVM Schematic .................................................................................................. 1217 DRV600EVM PCB Component Side (Top) ............................................................................. 1418 PCB Top Layer ............................................................................................................. 1419 PCB Bottom Layer ......................................................................................................... 14

List of Tables

1 DRV600 Features ............................................................................................................ 22 Recommended Supply Voltage ............................................................................................ 53 General Test Specifications ................................................................................................ 64 Electrical Data ................................................................................................................ 65 Audio Performance Data .................................................................................................... 66 Physical Specifications ...................................................................................................... 67 Related Documentation from Texas Instruments ...................................................................... 118 DRV600EVM Parts List .................................................................................................... 139 PCB Specifications ......................................................................................................... 13

All trademarks are the property of their respective owners.

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This datasheet has been downloaded fromhttp://www.digchip.com at this page

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1 Overview

Overview

The DRV600EVM evaluation module demonstrates the capabilities and performance of the DRV600RTJfrom Texas Instruments.

The DRV600 is a stereo line driver designed to allow the removal of the dc-blocking capacitors typicallyfound in an audio application, reducing overall component count and cost. The DRV600 is ideal forsingle-supply electronics where size and cost are critical design parameters.

The DRV600 is capable of driving 2V

RMS

into a 600 Ωload with a 3.3V supply. The DRV600 has a fixedgain of –1.5V/V and line outputs that have ±8kV electrostatic discharge (ESD) protection. The DRV600also has independent shutdown controls for the left and right audio channels.

This EVM is configured with two RCA phone input connectors and two RCA phone output connectors. Thepower supply is connected via a 2-pin, 2.54mm pin header. Table 1 summarizes the key parameters of thedevice.

Table 1. DRV600 Features

KEY PARAMETERSSupply Voltage 1.8V to 4.5VNumber of Channels 2Load Impedance Min 600 ΩOutput Voltage 2V

RMS

/ 600 Ω< 0.1% THDDYR > 108dB

This EVM is designed for evaluating applications such as A/V receivers, DVD receivers, DVDmini-component systems, home theater in a box (HTIB) designs, or set-top boxes. The module isdesigned to quickly demonstrate the electrical performance of the device.

This document covers EVM specifications and audio performance measurement graphs. It providesdesign documentation including schematics, a parts list, layout, and mechanical design.

Figure 1. DRV600EVM

Gerber files are available for download through the DRV600RTJ product folder on the TI web site .

The EVM is delivered with cables and an input-USB board to connect to an input source. The evaluationboard can be controlled by a PC.

Throughout this document, the acronym EVM and the phrases evaluation module and evaluation boardare synonymous with the DRV600EVM.

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1.1 DRV600EVM Features

Audio In - R

SGND

Audio In - L

SDx Bias

Circuitry

Charge

Pump

Short-Circuit

Protection

Audio Out - R

Audio Out - L

SVSS

AV = 1.5V/V-

SVDD

PVSS

C1P

C1N

SVSS

SVDD

Overview

•Two-channel evaluation module, a double-sided, plated-through printed circuit board (PCB)•2V

RMS

line output•No output capacitors•Shutdown button

Figure 2. DRV600 Functional Block Diagram

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1.2 PCB Key Map

LEFT

RIGHT

LEFT

RIGHT

2 Quick Setup Guide

2.1 Electrostatic Discharge Warning

2.2 Unpacking the EVM

Quick Setup Guide

The physical structure of the DRV600EVM is shown in Figure 3 .

Figure 3. DRV600EVM Physical Structure

This section describes the DRV600EVM with regard to power supply and the system interface. It alsoprovides information about handling and unpacking the module, absolute operating conditions, and adescription of the factory default switch and jumper configuration.

Many of the components on the DRV600EVM are susceptible to damage by electrostatic discharge (ESD).Customers are advised to observe proper ESD handling precautions when unpacking and handling theEVM, including the use of a grounded wrist strap at an approved ESD workstation.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVMcomponents.

Upon opening the DRV600EVM package, please check to make sure that the following items areincluded:

•1 DRV600EVM board with one DRV600RTJ device installed•1 PurePath CD-ROM

If either of these items is missing, please contact the Texas Instruments Product Information Centernearest you to inquire about a replacement.

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2.3 Power Supply Setup

3 Shutdown

DVDD

SHUTDOWN

> 50 sm> 50 sm

Shutdown

To power up the EVM, one power supply is needed. The power supply is connected to the EVM using a2-pin, 2.54mm pin header, J10. Table 2 summarizes the EVM power-supply requirements.

Table 2. Recommended Supply Voltage

VOLTAGE CURRENTDESCRIPTION LIMITATIONS REQUIREMENT CABLEPower supply 1.8V to 4.5V 0.3A

CAUTION

Failure to observe ESD handling procedures may result in damage to EVMcomponents.

For minimum click and pop interference during power-up and power-down, the shutdown pin should bekept low. The preferred power-up/-down sequence is shown in Figure 4 .

Figure 4. Recommended Power-Up/-Down Sequence

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4 DRV600EVM Performance

DRV600EVM Performance

This section provides the general test specifications, the electrical data, audio performance data, andphysical specifications.

Table 3. General Test Specifications

(1)

GENERAL TEST SPECIFICATIONS NOTES/CONDITIONSSupply Voltage 3.3VLoad Impedance 600 ΩInput Signal 1kHz SineMeasurement Filter AES17

(1)

These test conditions are used for all tests, unless otherwise specified.

Table 4. Electrical Data

(1)

ELECTRICAL DATA SPECIFICATIONS NOTES/CONDITIONSOutput Voltage, 600 Ω2.1V

RMS

1kHz, unclipped (< 1% THD), T

= +25 °COutput Voltage, 600 ΩV

RMS

1kHz, 10% THD+N, T

= +25 °COutput Voltage, 100k Ω2.15V

RMS

1kHz, unclipped (< 1% THD), T

= +25 °COutput Voltage, 100k ΩV

RMS

1kHz, 10% THD+N, T

= +25 °CSupply Current < 10mA 1kHz, 2mV

RMS

output voltageSupply Current < 12mA 1kHz, 2V

RMS

output voltage

(1)

All electrical and audio specifications are typical values.

Table 5. Audio Performance Data

(1)

AUDIO PERFORMANCE SPECIFICATIONS NOTES/CONDITIONSTHD+N, 600 Ω0.02V

RMS

< 0.02 % 1kHzTHD+N, 600 Ω0.2V

RMS

< 0.05 % 1kHzTHD+N, 600 Ω2V

RMS

< 0.08 % 1kHzTHD+N, 100k Ω0.02V

RMS

< 0.10 % 1kHzTHD+N, 100k Ω0.2V

RMS

< 0.13 % 1kHzTHD+N, 100k Ω2V

RMS

< 0.02 % 1kHzDynamic Range > 109dB Ref: 2V

RMS

, A-weighted, AES17 filterNoise Voltage < 7 μV

RMS

A-weighted, AES17 filterDC Offset < 5mV No signal, 600 ΩloadChannel Separation > 90dB 1kHz, 2V

RMS

Frequency Response: 20Hz to 20kHz +0.5/–0.5dB 2V

RMS

/600 Ω

(1)

All electrical and audio specifications are typical values.

Table 6. Physical Specifications

PHYSICAL SPECIFICATIONS NOTES/CONDITIONSPCB Dimensions 50 x 60 x 25 Width x Length x Height (mm)Total Weight 35g Components + PCB + Mechanics

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4.1 THD+N vs Voltage (600 Ωload)

0.1

THD+N (%)

0.01

0.001

3m 10m 100m

V (V)

RMS

1 2 4

1.8V DVDD

3.3V DVDD

4.5V DVDD

4.2 THD+N vs Voltage (100k Ωload)

0.1

THD+N (%)

0.01

0.001

3m 10m 100m

V (V)

RMS

12 4

1.8V DVDD

3.3V DVDD

4.5V DVDD

4.3 THD+N vs Frequency (600 Ωload)

0.1

THD+N (%)

0.01

0.001

20 100 1k

Frequency (Hz)

10k 20k

0.2VRMS

2VRMS

DRV600EVM Performance

Figure 5. THD+N vs Voltage (600 Ωload)

Figure 6. THD+N vs Voltage (100k Ωload)

Figure 7. THD+N vs Frequency (600 Ωload)

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0.1

THD+N (%)

0.01

0.001

20 100 1k

Frequency (Hz)

10k 20k

Left

Right

4.3.1 FFT Spectrum with –60dBFS Tone

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

-130

-140

-150

Output Voltage (dBr A)

0 2k

Frequency (Hz)

22k4k 6k 8k 10k 12k 14k 16k 18k 20k

DRV600EVM Performance

The DRV600EVM uses a 1 μF film capacitor for ac-coupling of the input signal. If a lower cost ceramiccapacitor such as an X7R is used, higher THD at low frequencies should be expected. Y5V capacitors willshow even higher THD performance and should not be used.

Figure 8. THD+N vs Frequency (600 Ωload) Using X7R Input Caps

The X7R capacitors raises the 20Hz THD from 0.02% to 0.1%—five times higher.

Reference voltage is 2V

RMS

, FFT size 16k.

Figure 9. FFT Spectrum with –60dBFS Tone

This spectrum corresponds to a dynamic range of 110dB, A-weighted. SNR measures at 110dB,A-weighted.

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4.4 Idle Noise FFT Spectrum

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

-130

-140

-150

Output Voltage (dBr A)

0 10k

Frequency (Hz)

20k 30k 40k 50k 60k 70k 80k 90k

4.5 Channel Separation

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

Channel Separation (dBr A)

20 100 1k

Frequency (Hz)

10k 20k

DRV600EVM Performance

Reference voltage is 2V

RMS

, FFT size 16k.

Figure 10. Idle Noise FFT Spectrum

Channel 1 output signal is 2V

RMS

; channel 2 input is grounded. Reference voltage is 2V

RMS

; the load is600 Ω.

Figure 11. Channel Separation

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4.6 Frequency Response

4.0

3.6

3.2

2.8

2.4

2.0

1.6

1.2

0.8

0.4

Amplitude (dBr A)

Frequency (Hz)

100k 100k1k 10k 200k

-20

-40

-60

-80

-100

-120

-140

-160

-180

-200

Phase ( )

Frequency (Hz)

100k 100k1k 10k 200k

4.7 Pop/Click (Enable)

DRV600EVM Performance

Measurement bandwidth filter is set to 500kHz.

Figure 12. Frequency Response

Figure 13. Phase Response

The low frequency cutoff of 10Hz (–3dB) is determined by the input ac-coupling capacitor together with theinput impedance of the DRV600.

A 1 μF capacitor is used on the DRV600EVM. The input impedance of the DRV600 is 15k Ω. Thisimpedance gives a –3dB cutoff of 10Hz. This result corresponds with the frequency responsemeasurements above.

An RC filter is placed at the DRV600 to filter high-frequency noise. A 220 Ωresistor and a 1nF NPOcapacitor is used. This configuration gives a –3dB frequency of 720kHz.

No input signal is applied. The measurement results are presented both in a time domain and in afrequency domain. The resistor load is 600 Ωin both examples.

The power supply is applied, and then the shutdown signal is released. The shutdown signal is used totrigger the measuring system.

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