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CRD44600-PH-FB Stereo 100 W PWM Amplifier Reference Design
Features
Two full-bridge channels, 100 W each 106 dB Dynamic Range - both channels 0.015% THD+N at 1 W Power Supply Rejection (PSR) feedback allowing amplifier to operate from low cost linear unregulated power supplies Spread Spectrum Modulation - Reduces Modulation Energy Passes CISPR and FCC requirements for radiated and power line conducted emissions Independent peak signal limiting per channel Thermal and over-current protection > 85% amplifier efficiency Works with GUI to configure the board Demonstrates recommended layout and grounding arrangements
controller. This reference design implements a twochannel amplifier which delivers 100 W per full-bridge channel into 8 loads using a single +50 V supply (at 1% THD+N). A 155 W unregulated linear power supply is used to power the CRD44600-PH-FB. As shown below, the CS44600 IC takes two stereo digital audio PCM inputs and converts them to PWM outputs. This 64-pin LQFP PWM controller provides an integrated sample rate converter for 32 kHz-192 kHz input sample rate support, volume up/down, speaker load compensation, peak limiting to prevent amplifier clipping, power supply ripple compensation, and AM frequency interference elimination. This reference design uses the the Philips TDA8939, an integrated power stage back end for digital amplifiers (two TDA8939 parts configured as full-bridges are used for this two-channel design). Current limiting and thermal protection are provided by the TDA8939. The inductor/capacitor 2nd order low pass filter (LPF) removes high frequency components from the output signal effectively converting it from digital to analog. ORDERING INFORMATION CRD44600-PH-FB Reference Design
Description
The CRD44600-PH-FB PWM Amplifier demonstrates the CS44600, Cirrus' multi-channel pure digital PWM
I
+50 V
PSR Circuitry
155W Unregulated Linear Power Supply
+50 V
CS4461 ADC
+50 V Channel 1
PCM Clocks & Data
Philips TDA8939
LPF
8
Audio Inputs and GUI Interface
I2C Host Control
CS44600 (PWM Controller) Channel 2
+50 V Philips TDA8939
LPF
8
Cirrus Logic, Inc. www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2005 (All Rights Reserved)
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TABLE OF CONTENTS
1. SYSTEM OVERVIEW ............................................................................................................... 3 1.1 CS44600 PWM Modulator ................................................................................................. 3 1.2 CS4461 PSR Feedback ADC ............................................................................................ 3 1.3 TDA8939 Power Stage ...................................................................................................... 3 1.4 CS8416 Digital Audio Receiver .......................................................................................... 3 1.5 CS5341 Analog to Digital Converter .................................................................................. 3 1.6 Control Port Interface and GUI .......................................................................................... 4 1.7 Unregulated Linear Power Supply ..................................................................................... 4 2. GUI CONTROL ......................................................................................................................... 5 2.1 CS44600 Dialog Tab .......................................................................................................... 5 2.2 Advanced Register Debug Tab .......................................................................................... 6 3. POWER SUPPLY ..................................................................................................................... 8 3.1 Power Supply Ratings ........................................................................................................ 8 3.2 Power Supply Decoupling .................................................................................................. 8 4. ELECTROMAGNETIC INTERFERENCE (EMI) ....................................................................... 9 4.1 Suppression of EMI at the Source ..................................................................................... 9 4.2 EMI Testing ........................................................................................................................ 9 5. CRD44600-PH-FB SCHEMATICS ......................................................................................... 14 6. CRD44600-PH-FB POWER SUPPLY SCHEMATICS ........................................................... 19 7. CRD44600-PH-FB LAYOUT ................................................................................................... 20 8. CRD44600-PH-FB BILL OF MATERIALS ....................................................................... 23 9. TYPICAL PERFORMANCE PLOTS ....................................................................................... 25 10. REVISION HISTORY ............................................................................................................ 30
LIST OF FIGURES
Figure 1. CS44600 Dialog Tab........................................................................................................ 5 Figure 2. Advanced Register Debug Tab - CS44600...................................................................... 6 Figure 3. Advanced Register Debug Tab - CS8416........................................................................ 7 Figure 4. EMI Testing Setup.......................................................................................................... 11 Figure 5. EMI Testing Setup, Close-up ......................................................................................... 11 Figure 6. Radiated EMI Testing Results- 30 MHz to 200 MHz...................................................... 12 Figure 7. Radiated EMI Testing Results- 200 MHz to 1 GHz........................................................ 12 Figure 8. Conducted Power Line Testing Results ......................................................................... 13 Figure 9. Audio Inputs ................................................................................................................... 14 Figure 10. CS44600 ...................................................................................................................... 15 Figure 11. PSR Feedback ............................................................................................................. 16 Figure 12. Left/Right Channels...................................................................................................... 17 Figure 13. Control Port and Power................................................................................................ 18 Figure 14. Power Supply ............................................................................................................... 19 Figure 15. Silk Screen Top............................................................................................................ 20 Figure 16. Topside Layer .............................................................................................................. 21 Figure 17. Bottomside Layer ......................................................................................................... 22 Figure 18. Frequency Response ................................................................................................... 25 Figure 19. THD+N vs. Frequency at 1 W, 10 W, and 50 W .......................................................... 26 Figure 20. THD+N vs. Power at 1 kHz .......................................................................................... 27 Figure 21. FFT at -60 dBFS and 1 kHz ......................................................................................... 28 Figure 22. FFT at -1 dBFS and 1 kHz. Red = PSR Feedback Off. Blue = PSR Feedback On ..... 29
LIST OF TABLES
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Table 1. Bill of Materials................................................................................................................ 23 Table 2. Revision History .............................................................................................................. 30
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1. SYSTEM OVERVIEW
The CRD44600-PH-FB reference design is an excellent means for evaluating the CS44600 sixchannel Class-D PWM modulator. It incorporates a digital Class-D PWM modulator, two fullbridge power stages, and power supply rejection (PSR) circuitry, all on a two-layer board. The CRD44600-PH-FB schematic set is shown in Figures 9 through 13 and the board layout is shown in Figures 15 through 17.
1.1
CS44600 PWM Modulator
A complete description of the CS44600 is included in the CS44600 product data sheet. The CS44600 converts linear PCM data to pulse width modulated (PWM) output. It uses a Sample Rate Converter (SRC) to eliminate serial audio interface jitter effects and maintains a constant PWM switch rate of 384 kHz, resulting in high-quality sound output. PCM data and clocks are input from either the CS8416 (S/PDIF Receiver), CS5341 (Stereo ADC), or J19 (PCM Input Header).
1.2
CS4461 PSR Feedback ADC
A complete description of the CS4461 is included in the CS4461 product data sheet. The CS4461 is connected to the CS44600 to provide power supply rejection (PSR) for the VP supply voltage connected to J17. Resistors R41 and R42 are set for VP = +50 V. See the CS4461 data sheet for equations to determine the resistor values.
1.3
TDA8939 Power Stage
A complete description of the Philips TDA8939 is included in the TDA8939 product data sheet. The TDA8939 is a high-voltage PWM amplifier power stage. It integrates two half-bridge drivers and fault protection. For the CRD44600-PH-FB, each of the two TDA8939's are configured as full-bridges. Care should be taken to not connect the full bridge black speaker connectors to ground as these outputs are driven.
1.4
CS8416 Digital Audio Receiver
The operation of the CS8416 receiver and a discussion of the digital audio interface are described in the CS8416 data sheet. The CS8416 converts the input S/PDIF data stream into PCM data for the CS44600. The CS8416 operates in master mode with RMCK = 256*Fs. The digital Interface format is set to Left Justified (24-bit). D20 (RERR) indicates a receiver error, such as loss of lock. S/PDIF input is through OPT1 or J33.
1.5
CS5341 Analog to Digital Converter
The operation of the CS5341 ADC is described in the CS5341 data sheet.
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The CS5341 converts analog audio into PCM data for the CS44600. The CS5341 operates in slave mode and the digital Interface format is set to Left Justified (24-bit). Analog input is through J5 and J6.
1.6
Control Port Interface and GUI
The CS44600 and CS8416 are controlled through the provided control port interface. Connection to the control port is made through J37 (RS-232 Serial). A Windows based GUI provides control over all the individual registers of the CS44600 and the CS8416.
1.7
Unregulated Linear Power Supply
The power supply used for the CRD44600-PH-FB is a linear 155 W supply. The supply provides an unregulated +50 V for the TDA8939 power stages. The power supply consists of a transformer, diode bridge rectifier, and bulk capacitor. Schematics are shown in Figure 14.
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2. GUI CONTROL
The CRD44600-PH-FB is shipped with a Microsoft Windows(R) based GUI, which allows control over the CS8416 and CS44600 registers. Interface to the CDB44600 control port is provided using an RS-232 serial cable. The GUI requires no installation and can be run directly from the CD or copied to a local directory and run from there. Once the serial port cable is connected between the CRD44600-PH-FB and the host PC, load the FlexLoader.exe from the CRD44600-PH-FB directory. Once loaded, all registers are set to their default reset state. The GUI File menu provides the ability to save and restore (load) register settings. Sample script files are provided for basic functionality. The GUI serial port interface is setup by default for 115.2 Kbps operation on COM1. To change these settings, edit the "CRD44600-PH-FBCommunications" section of the flexconfig.ini file or change the system communications setting in the Windows(R) control panel.
2.1
CS44600 Dialog Tab
The CS44600 Dialog tab provides high level control over the CS44600's registers. Controls are provided to change volume, mute, enable PSR, enable the power stages, limiter control.
Figure 1. CS44600 Dialog Tab
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2.2 Advanced Register Debug Tab
The Advanced Register Debug tab provides low level control over the CS44600 and CS8416 individual register settings. Each device is displayed on a separate tab. Register values can be modified bitwise or bytewise. For bitwise, click the appropriate push button for the desired bit. For bytewise, the desired hex value can be typed directly in the register address box in the register map.
Figure 2. Advanced Register Debug Tab - CS44600
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Figure 3. Advanced Register Debug Tab - CS8416
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3. POWER SUPPLY 3.1 Power Supply Ratings
The required power supply current rating can be estimated as follows. 95 W is used as the reference output power per channel because this represents the typical full scale output with no clipping. Assume the efficiency, , is approximately 85% (this accounts for power to supply control electronics and overhead), then for 95 W x 2 channels:
PTotal =
POut
=
190 W = 224 W 0.85
P Supply =
224 W P Total = = 112 W 2 2
Consequently the supply current is:
ISupply = PSupply 112W = = 2.24 A VSupply 50V
The factor of 2 in the denominator of the PSupply calculation arises from the fact that for typical consumer applications in A/V or DVD receivers, the power supply should be capable of providing 1/2 the total requirement for all channels operating at full power. This design guide is still quite conservative, and gives more than adequate headroom in real applications.
3.2
Power Supply Decoupling
Proper power supply decoupling is one key to maximizing the performance of a Class-D amplifier. Because the design uses an open loop output stage, noise on the power supply rail will be coupled to the output. While the PSR functionality of the CS44600 helps reduce power supply noise feedthrough to the output, careful decoupling of the power stage supply rails is essential. Referring to Figure 15, the top side of the CRD44600-PH-FB PWM amplifier board, good decoupling practice is shown. Notice that the 0.1 F ceramic capacitors are as close as physically possible to the power pins of the TDA8939. The ground side of the capacitors is connected directly to top side ground plane, which is also used by the power supply return pins. This keeps the high frequency current loop small to minimize power supply variations and EMI. 470 F electrolytic capacitors are also located in close proximity to the power supply pins to supply the current locally for each channel. These are not required to be expensive low ESR capacitors. General purpose electrolytic capacitors that are specified to handle the ripple current can be used. The real time PSR feedback of the CS44600/CS4461 can greatly attenuate the induced voltages due to the power supply ripple current.
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4. ELECTROMAGNETIC INTERFERENCE (EMI)
This reference design from Cirrus Logic is a board level solution which is meant to control emissions by minimizing and suppressing them at the source in contrast to containing them in an enclosure. Utilizing spread spectrum modulation techniques to reduce the overall switching energy, along with a low internal modulator clock frequency of 24.576 MHz, the radiated emissions are greatly reduced. These features allow for the use of very low cost components to couple the high frequency noise to chassis ground. No common mode chokes, inductors, or power line filters were required. The EMI requirements for an amplifier have added dimensions beyond those imposed on power supplies. Audio amplifiers are usually located in close proximity to radio receivers, particularly AM receivers which are notoriously sensitive to interference. Amplifiers also need to operate with speaker leads of unpredictable length and construction which make it possible for any high frequency currents that appear on the outputs to generate nuisance emissions.
4.1
Suppression of EMI at the Source
Several techniques are used in the circuit design and board layout to minimize high frequency fields in the immediate vicinity of the high power components. Specific techniques include the following: * * As was mentioned in Section 3.2, effective power supply decoupling of high frequency currents, and minimizing the loop area of the decoupling loop is one aspect of minimizing EMI. Each output of the TDA8939 includes "snubbing" components. For example, OUT1 of U1 includes snubber components R18/R30 (5.6 ) and C34/C46 (560 pF). These components serve to damp ringing on the switching outputs in the 30-50 MHz range. The snubbing components should be as close as practical to the output pins to maximize their effectiveness. Again, refer to Figure 15 for the preferred component layout. A separate ground plane with a capacitively coupled electrical connection to the chassis and which surrounds the speaker output connector should be implemented. This allows the speaker outputs to be AC coupled to the chassis just before they exit the chassis from the speaker connector. Again, refer to Figure 15 for the preferred component layout. Make use of source termination resistors on all digital signals whose traces are longer than approximately 25 mm.
*
*
It is extremely critical that the layout of the power amplifier section of the Cirrus Logic CS44600 Reference Design be copied as exactly as possible to assure best RF/EMI performance.
4.2
EMI Testing
The CRD44600-PH-FB has been tested to CISPR and FCC Class B limits for radiated and power line conducted emissions. The same test setup and test signal were used for all tests. The setup consisted of an unregulated linear power supply, CRD44600-PH-FB board, 5m of speaker cable, and two 8- resistive loads. This setup is shown in Figure 4
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and Figure 5. The power supply earth ground was connected to the board chassis ground at a single point. A CD-player with an optical fiber connection was used a signal source. A constant 0dBFS, 1-kHz sine wave was used as the test signal and the board volume was set so that the output to the resistive loads was 1/8th of the full scale output level, or 12.5 W. The test results shown in Figure 6 and Figure 7 are pre-screened radiated EMI test results from an antenna placement of 3 m in an anechoic chamber. The test results shown in Figure 8 are preliminary power line conducted test results.
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Figure 4. EMI Testing Setup
Figure 5. EMI Testing Setup, Close-up
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Figure 6. Radiated EMI Testing Results- 30 MHz to 200 MHz
Figure 7. Radiated EMI Testing Results- 200 MHz to 1 GHz
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Figure 8. Conducted Power Line Testing Results
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5. CRD44600-PH-FB SCHEMATICS
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Figure 9. Audio Inputs
15
CRD44600-PH-FB
16
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Figure 10. CS44600
CRD44600-PH-FB
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Figure 11. PSR Feedback
17
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Figure 12. Left/Right Channels
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Figure 13. Control Port and Power
19
CRD44600-PH-FB
6. CRD44600-PH-FB POWER SUPPLY SCHEMATICS
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Figure 14. Power Supply
CRD44600-PH-FB
7. CRD44600-PH-FB LAYOUT
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Figure 15. Silk Screen Top
21
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Figure 16. Topside Layer
CRD44600-PH-FB
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Figure 17. Bottomside Layer
23
24
Qty Reference Desi gnator MFG 21 C1 C2 C4 C9 C10 C11 C12 C56 C71 C72 C73 C83 C88 C89 C153 PANASONIC C167 C173 C174 C205 C208 C210 0 4 10 2 18 6 2 4 0 7 39 C26 C63 C64 C96 NO POP C27 C31 C54 C59 C182 C190 C219 PANASONIC C28 C32 C37 C40 C41 C43 C49 C50 C52 C55 C57 C60 C74 C124 KEMET C126 C128 C129 C134 C156 C158 C159 C164 C166 C168 C170 C172 C175 C177 C180 C181 C194 C199 C201 C213 C221 C222 C230 C231 C232 C29 C30 C33 C34 C35 C36 C45 C46 C47 C48 C38 C39 C130 C42 C44 C77 C127 C131 C53 C58 C75 C122 C123 C215 D20 HS1 J1 J3 J2 J4 J5 J6 J33 J7 J17 J19 J26 J37 L1 L2 L3 L4 L9 L10 L16 L17 MH1 MH2 MH3 MH4 MH5 MH6 OPT1 R1 R2 R3 R14 R15 R38 R74 R157 R169 R179 PANASONIC KEMET KEMET KEMET KEMET PANASONIC KEMET KEMET CHICAGO MINIATURE SUMMIT HEAT SINKS CO LTD JOHNSON COMPONENTS JOHNSON COMPONENTS A/D ELECTRONICS SAMTEC MOLEX SAMTEC SAMTEC AMP TRANSTEK MAGNETICS SUMIDA SUMIDA PANASONIC PANASONIC KEYSTONE TOSHIBA DALE PANASONIC KEMET MURATA PANASONIC KEMET ECQE1684KF C1206C104K1RAC C3 C20 C21 C22 C78 C79 C5 C6 C7 C8 C13 C84 C90 C91 C92 C93 C94 C95 C195 C196 NO POP KEMET KEMET NP-CAP-0603 C1206C224J5RAC C0603C103K5RAC MFG P/N ECJ1VC1H102J C14 C16 C15 C19 C61 C62 C67 C68 C69 C70 C80 C81 C82 C85 C86 C87 C110 C111 C112 C113 C17 C51 C76 C125 C214 C227 C18 C23 C24 C25 C65 C66 ECA1AM101 C0603C471J5GAC GRM32ER72A105KA01 L NP-CAP-0805 ECA1HM100I C0603C104K4RAC 2 8 3 5 2 1 2 1 1 1 2 2 3 1 1 1 1 1 4 1 1 1 1 6 1 10 ECA1JM471B C0805C561J1GAC C0805C222J5GAC C1206C105K3RAC C1206C103J3GAC ECA1JM100I C0603C121J5GAC C0603C223J5RAC CMD28-21SRC/TR8/T1 311-00005-01 111-0102-001 111-0103-001 ARJ-2018-NIL-1-NIL TSW-102-07-G-S 15-24-4049 TSW-104-07-G-T TSW-105-07-G-D 747844-6 TMP50627CT CDRH125-470MC CDRH125-681MC ELJFA470KF ELJFD4R7KF 1809 TORX173 CRCW06031002F
Item Descri tion p 1 CAP 1000pF 5% 50V C0G 0603
2 3 4
NO POP CAP 0603 CAP 0.22uF 5% 50V X7R 1206 CAP 0.01uF 10% 50V X7R 0603
5 6
CAP 0.68F 10% 100V POLY RAD CAP 0.1uF 10% 100V X7R 1206
7 8 9
CAP 100uF 20% 10V ELEC RAD 5X11 CAP 470pF 5% 50V C0G 0603 CAP 1uF 10% 100V X7R 1210
8. CRD44600-PH-FB BILL OF MATERIALS
10 11 12
NO POP CAP 0805 CAP 10uF 20% 50V ELEC RAD CAP 0.1uF 10% 16V X7R 0603
13 14 15 16 17 18 19 20 21 22
CAP 470uF 20% 63V ELEC RAD CAP 560pF 5% 100V C0G 0805 CAP 2200pF 5% 50V C0G 0805 CAP 1uF 10% 25V X7R 1206 CAP 0.01uF 5% 25V C0G 1206 CAP 10uF 20% 63V ELEC RAD 5x11 CAP 120pF 5% 50V C0G 0603 CAP 0.022uF 5% 50V X7R 0603 LED CLR SUP RED 1.7V 1mA 1.6MCD SMD HTSNK 30W DUAL SITE
23
CON BPOST 2" SILV NYLON INS RED
24
CON BPOST 2" SILV NYLON INS BLK
25 26 27 28 29 30 31
JACK RCA, RA-BLK, PHONO, GLD TABS HDR 2x1 ML .1"CTR 062BD ST GLD TH CON PWR SHIELDED 4PIN HDR 4x3 MLE .1"CTR S GLD HDR 5x2 MLE .1"CTR S GLD CON DSUB 9P FML .318"W W/ BDLCK RA IND 22uH 6A 10% 400 DIA TH
32 33 34 35 36 37 38
IND 47uH 20% CDRH125 SERIES SMT IND 680uH 20% CDRH125 SERIES SMT IND 47uH 10% 1210 IND 4.7uH 10% 0805 SPCR, STANDOFF 4-40 THR, 0.875"L OPTICAL RCVR 6Mb/s 7V 20MA 10M RES 10k OHM 1/10W 1% 0603 FILM
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Table 1. Bill of Materials
Item Descri tion p 39 RES 22.1 OHM 1/10W 1% 0603 FILM 4 15 8 4 6 10 5 1 0 3 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 4 6 3 3 U31 U32 Y2 XJ1 XJ2 XJ3 XJ4 XMH1 XMH2 XMH3 XMH4 XMH5 XMH6 XHS1 XHS1 U20 U26 U10 U14 U17 U8 U9 CIRRUS LOGIC NATIONAL SEMICONDUCTOR R41 R51 R61 R98 R146 R42 R111 R150 R151 R156 R171 R178 U1 U2 U3 U4 U6 U7 DALE DALE NO POP DALE DALE DALE PHILIPS NJR CIRRUS LOGIC NATIONAL SEMICONDUCTOR DALE DALE DALE DALE CRCW25125R6J CRCW06036490F CRCW06031003F CRCW0805100J CRCW06032001F CRCW06035492F NP-RES-0805 CRCW0603102J CRCW060375R0F CRCW06033011F TDA8939TH NJM2140R CS5341-CZZ/E LP2985IM5-3.3 CS4461-CZZ/D LP2985IM5-2.5 DALE DALE CRCW251222R1F CRCW060390R9F
Qty Reference Desi gnator 12 R4 R11 R72 R73 R93 R108 R154 R161 R162 R167 R172 R176
MFG DALE
MFG P/N CRCW060322R1F
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R5 R6 R7 R8 R12 R13 R26 R27 R62 R63 R94 R95 R96 R97 R131 R133 R134 R135 R140 R17 R18 R19 R20 R29 R30 R31 R32 R24 R25 R60 R187 R28 R33 R34 R35 R36 R37 R39 R45 R46 R47 R48 R68 R106 R170 R180 R182 C&D TECHNOLOGIES NDL4805S CIRRUS LOGIC CS44600-CQZ/A FAIRCHILD SEMICONDUCTOR NC7SZ157P6X CYGNAL CRYSTAL SEMICONDUCTOR MAXIM MICROCHIP CAL CRYSTAL ALPHA WIRE COMPANY BUILDING FASTENERS McMASTER-CARR BUILDING FASTENERS C8051F320 CS8416-CZ/E MAX232ACWE 24LC00-I/OT CX21AH-24.576MHZ 3080 RD005 PMS 440 0031 PH 90190A106 INT LWZ 004
40 41
RES 22.1 OHM 1W 1% 2512 FILM RES 90.9 OHM 1/10W 1% 0603 FILM
42 43 44 45
RES 5.6 OHM 1W 5% 2512 FILM RES 649 OHM 1/10W 1% 0603 FILM RES 100k OHM 1/10W 1% 0603 FILM RES 10 OHM 1/8W 5% 0805 FILM
46 47 48 49 50 51 52 53 54 55
RES 2k OHM 1/10W 1% 0603 FILM RES 54.9k OHM 1/10W 1% 0603 FILM NO POP RES 0805 RES 1k OHM 1/10W 5% 0603 FILM RES 75 OHM 1/10W 1% 0603 FILM RES 3.01k OHM 1/10W 1% 0603 FILM IC LOG CLASS D PWR COMP HSOP24 IC LNR DUAL OP AMP LOW V RRO VSP8 IC CRUS, 105dB 192kHz M-BIT AUD ADC IC LNR VREG PWR 150mA 3.3V SOT23-5
56 57
IC CRUS A/D PSR FEEDBACK TSSOP24 IC LNR VREG PWR 150MA 2.5V SOT23-5
58 59 60
IC LNR ISO 2W SINGLE OUT DC-DC CONV IC CRUS 6-CH DIG AMP CTRL LQFP64 IC LOG, UHS 2IN NON INV MUX SC70-6
61 62
IC PGM USB 16kB FLASH MCU LQFP32 IC CRUS 192kHz DIG AUD RCVR TSSOP28
63 64 65 65 66 67 68
IC LNR 5V RS-232 DRV/RCVR SO16-300 IC PGM 128 BIT SER EEPROM SOT23-5 OSC 24.576MHz 50PPM 5V HALF DIP8 WIRE, HOOK-UP 12AWG 65/30 RED 100ft SCREW 4-40X5/16" PH STEEL SCREW 4-40X1/4"L PH STEEL WASHER LOCK INTERNAL #4
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9. TYPICAL PERFORMANCE PLOTS
These performance plots were taken with the CRD44600-PH-FB powered from the described +50 V linear unregulated power supply. The PSR circuitry was calibrated to a nominal +50 V rail.
2k
5k
10k 20k
-0.5
-1.5
-2.5
-3.5
+0.5
d B r
26
A
-4.5
+1
-5 20
-0
-1
-2
-3
-4
50
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Figure 18. Frequency Response
1k 200 500 Hz
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0.2
0.1
50 W 10 W 1W
0.05
%
0.02
0.01
0.005
0.002 50 100 200 500 Hz
Figure 19. THD+N vs. Frequency at 1 W, 10 W, and 50 W
CRD44600-PH-FB
0.001 20
1k
2k
5k
10k 20k
27
28
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02 500m 1 2 W
Figure 20. THD+N vs. Power at 1 kHz
CRD44600-PH-FB
0.01 100m 200m
5
10
20
50
100
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+0
-10
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-20
-30
-40
-50
d B r
-60
-70
A
-80
-90
-100
-110
-120
-130 50 100 200 500 Hz
Figure 21. FFT at -60 dBFS and 1 kHz
CRD44600-PH-FB
-140 20
1k
2k
5k
10k 20k
29
30
+0
-10
-20
-30
-40
-50
d B r
-60
-70
A
-80
-90
-100
-110
-120
-130 50 100 200 500 Hz
Figure 22. FFT at -1 dBFS and 1 kHz. Red = PSR Feedback Off. Blue = PSR Feedback On
CRD44600-PH-FB
-140 20
1k
2k
5k
10k 20k
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10. REVISION HISTORY
Release RD1 Date March 2005 Changes 1st Release
Table 2. Revision History
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to
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MAR '05 DS633RD1
31
CRD44600-PH-FB
32
MAR '05 DS633RD1

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