Audio Xcellence: XDCP Signal Integrity Report (Audio Characterization Report) ® Application Note Introduction Most audio equipment testing is done on a stimulusresponse basis. A signal of known characteristics is fed to the input of the Device Under Test (DUT) and the output of the DUT is measured. The performance of the DUT is determined by degradation of the output signal from the known input signal. Often, sets of measurements are made as the stimulus is swept or stepped across the audio frequency spectrum or across an amplitude range, and the desired performance information is determined by the relationship between the corresponding set of output measurements. The most common stimulus for audio testing is a sine wave. The sine wave is unique since it is the only signal to have all its energy concentrated at a single point in the frequency spectrum, referred to as the fundamental frequency. It is therefore relatively simple to analyze test results from single sine wave testing. Multiple sine waves (usually two) are used for intermodulation distortion testing, and large numbers of multiple sine waves are used for some new testing July 8, 2005 AN144.0 techniques. White noise, pink noise, square waves, and impulses may also be used as stimulus for certain types of audio testing. It is also possible to make certain measurements using program material such as music or voice as stimulus. All three of the Intersil XDCPs used in this noise report were subjected to the testing criteria outlined in the above two paragraphs. Table of Contents Signal to Noise Ratio 2 Total Harmonic Distortion- THD+N,& Dual Tone Tests 4 Frequency Response 8 Mutli-Channel Crosstalk & Level Matching 10 Measurement Results Summary 11 Additional Test Results 12 Appendix 14 Test Setup Using the Audio Precision System 2 Benchtop Power Supply PC for AP2 Control and Data Display/Storage +5VDC AP2 Interface Adapter Card –5VDC GND Analog Test Signal Out -60dB at 1kHz BNC OUT AP2Audio Precision System 2 BNC IN BNC GND Test Analog Signal In VIN (1-4) VW (1-4) BNC Signal Ground VL (1-4) Device Under Testx9408 INTERSIL SDCP DEVELOPMENT & EVALUATION BOARD FIGURE 1. AUDIO MEASUREMENT TEST SETUP 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 144 Signal to Noise Ratio (SNR) Applications for these parts include filters, analog signal processing, linear level control, and in any application where audio frequency analog signals are present and signal integrity and low noise is important. Signal to Noise Ratio (SNR) is the ratio of the normal operating level of the device compared with the device’s noise floor. SNR can be thought of as the effective dynamic signal range of most types of analog audio devices. SNR is determined by injecting a 0dB, 1kHz sine wave (generated by the AP2*) into the input of the Device Under Test (DUT). The signal is processed by the DUT and it’s output signal is then fed back into the analyzer section of the AP2. The AP2 is then adjusted to set up a 0dB reference for this signal. The output of the AP2 is enabled again but this time the 1kHz sine wave is removed. The output of the DUT is analyzed by the AP2 again and the ratio between this baseline noise level with no input signal and the original 0dB level set in the first measurement is the SNR. The Signal to Noise Ratios (SNR) of the X9408, X9241A, X9C102 parts are all exceptional. All three parts exceeded 119dB SNR in the audio frequency spectrum (20Hz to 20kHz). (See graphs for all three parts and all measurements at the end of this document). The higher the SNR values the quieter the system will be, consequently, low-level detail will become audible. Dropping the noise floor by 10dB on the low end has the same effect as if the level control were turned up by the same amount. The SNR plots are found on the following graphs. *AP2-Audio Precision System 2 A 1kHz Sine Wave at –60 dB Signal Plotted From 20Hz to 20kHz +0 -20 -40 -60 d B r -80 -100 A -120 -140 -160 -180 20 50 100 200 500 1K 2K Color Line Style Thick Data Axis Blue Solid 1 Fft. Ch. 1 Ampl Left 5K 10K 20K SNR Reads 116 dB on the AP2 Meter XDCP9408 set at step 63 on chan 1 Global Specialties power supply #1310 2 AN144.0 July 8, 2005 Application Note 144 CHAN 0 Audio Precision Intersil X9408 SNR CHAN 0 +0 d B r -100 A -150 -50 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Cyan Blue Solid Solid 3 3 Fft.Ch.1 Ampl Fft.Ch.1 Ampl Left Left X9408w(10K ohms) SNR=120dB on Chan 0 1kHz@0dB Set Ref (from 1.4vp@0dB) Step 63(Full On) Audio Precision XICOR X9241 SNR CHANNEL 0 05/20/99 19:24:51 AUDIO PRECISION INTERSIL X9241A SNR CHANNEL 0 +0 -20 -40 -60 d B r -80 -100 A -120 -140 -160 -180 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Cyan Solid Solid 3 3 Fft.Ch.1 Ampl Fft.Ch.1 Ampl Left Left X9241y(2k ohms) SNR=119 dB on Chan 0 1kHz@0dB Set Ref (from 1.4vp@0dB) Step 63(Full On) MBPWR 3 AN144.0 July 8, 2005 Application Note 144 AUDIO PRECISION INTERSIL X9C102 SNR +0 -20 -40 d B r A -60 -80 -100 -120 -140 -160 -180 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Cyan Blue Solid Solid 3 3 Fft.Ch.1 Ampl Fft.Ch.1 Ampl Left Left X9C102(1K ohms) SNR= 119dB 1kHz@0dB Set Ref (from 1.4vp@0dB) Step 99(Full On) MBPWR Total Harmonic Distortion- THD+N, & Dual Tone Tests The THD+N (Total Harmonic Distortion + Noise) level for all three parts is below -100dB which is exceptional for this class of parts. (See graphs for all three parts and all measurements at the end of this document). The dual tone type of tests are less common than the THD+N tests but are valuable in revealing problems with intermodulation distortion. In the parts that were measured with two lone tests at various frequencies generated no harmonics greater that -105dB. In particular these two specifications define a parts audio frequency performance quality and assure a circuit designer that all three will work well as analog signal attenuators without adding extra harmonics. The results of these tests clearly show that all three of the Intersil parts exhibit excellent low level harmonic tendencies.Applications for these parts include filters, analog signal processing, linear level control, and in any application where audio frequency analog signals are present and need to be easily controlled and where signal integrity is important. 4 Total Harmonic Distortion + Noise (THD+N): Measured by attenuating the fundamental signal (lkHz @ 0dB) with a narrow-band notch filter, then measuring the remaining signals which consist of harmonics of various orders, wideband noise, and possibly interfering signals. THD causes audio signals to become smeared and less clear/focused. It can also raise baseline noise levels which masks out low level audio information. Creating extra signals and adding them back into the final output is always a BAD Thing. Two Tone Harmonic Test: Where two 0dB signals at two different frequencies are fed into the DUT and the output is then measured by the AP2 across the entire audio frequency range (from 20Hz to 20kHz). Any harmonics (extra signals at even or odd multiples of the original two signals and multiples of their differences as well) created from the injection of these two signals into the DUT are displayed on a log frequency vs. amplitude graph. This test is useful in revealing any higher audio frequency anomalies which can be created by bad layout, non-linear responses, stray capacitance, and other circuit abnormalities. The audibility of this type of distortion is another form of THD. Plots of THD+N arc are found on this and the following 3 pages. AN144.0 July 8, 2005 Application Note 144 AUDIO PRECISION INTERSIL X9408 THD+N CHAN 0 +0 -20 -40 d B r -60 -80 A -100 -120 -140 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Solid 3 Fft.Ch.1 Ampl Left X9408w(10K ohms) CHAN 0 THD+N = 106dB 1kHz@ 1.4vp-0dB Step 63(last step) - AP2 Z @ 100K MBPWR CHAN 0 AUDIO PRECISION INTERSIL X9241A THD+N CHAN 0 +0 -20 -40 d B r A -60 -80 -100 -120 -140 -160 -180 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Solid 3 Fft.Ch.1 Ampl Left X9241y(2K ohms) THD+N @ 1kHz @ 0dB=101dB Channel 0 Set @ Step 63 AP2 100k Input Z, 5000 pts. MBPWR 5 AN144.0 July 8, 2005 Application Note 144 AUDIO PRECISION INTERSIL X9C102 THD+N +0 -20 -40 d B r A -60 -80 -100 -120 -140 -160 -180 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Solid 3 Fft.Ch.1 Ampl Left X9C102(1K ohms) THD+N = -102dB 1kHz@OdB (from 1.4vp@0dB) Step 99 MBPwr IMD TEST 18-19kHz CHAN 0 AUDIO PRECISION INTERSIL X9408 DUAL TONE IMD TEST 18-19kHz CHAN 0 +0 -20 d B r A -40 -60 -80 -100 -120 -140 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Solid 3 Fft.Ch.1 Ampl Left X9408w(10K ohms) DUAL TONE TEST CHAN 0 1819kHz@OdB (from 1.4vp@0dB) AP2 Input Z = 100k ohms Step 63 6 AN144.0 July 8, 2005 Application Note 144 CHAN 0 AUDIO PRECISION INTERSIL X9241A DUAL TONE IMD TEST CHAN 0 +0 -20 d B r A -40 -60 -80 -100 -120 -140 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Blue Solid Solid 3 3 Fft.Ch.1 Ampl Fft.Ch.1 Ampl Left Left X9241y(2K ohms) Two Tone Test 18 19kHz @ 0dB channel 0, Step 63 MBPWR Audio Precision XIC0R X9C102 DUAL TONE IMD TEST 06/18/99 11:02:00 AUDIO PRECISION INTERSIL X9C102 DUAL TONE IMD TEST +0 -20 -40 d B r A -60 -80 -100 -120 -140 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Blue Solid Solid 3 3 Fft.Ch.1 Ampl Fft.Ch.1 Ampl Left Left X9C102(1K ohms) Two Tone Test 18 19kHz @ 0dB Step 99 MBPWR 7 AN144.0 July 8, 2005 Application Note 144 FREQUENCY RESPONSE bandwidth of a standard 20kHz audio signal). The AP2 plots of the frequency response, of the three parts being tested, are found in the following 2 pages. The upper frequency response limit of an analog system is usually determined by the point at which the input signal is reduced by the DUT (the circuit or part being tested) on it’s output by a factor of –3dB. This standard of –3dB down corresponds to 1/2 power or 0.707 times the voltage of the input signal. All the Intersil parts tested (using the Audio Precision System 2) were flat to 200kHz, which is the upper measurement frequency limit of the AP2 (10 times the These three parts therefore have no frequency based limitations in the audio frequency range which make them suitable for any application that requires signal level attenuation such as low frequency square wave generators, data loggers, vibration analyzers, noise cancellation equipment, environmental controls, etc. Audio Precision XICOR X9408 CHAN 0 Frequency 05/26/99 14:40:26 Response AUDIO PRECISION INTERSIL X9408 CHAN 0 FREQUENCY RESPONSE +2.5 +2 +1.5 +1 d B r A +0.5 +0 -0.5 -1 -1.5 -2 20 50 100 200 500 1k 2k 5k 10k 20k 50k 200k Hz Color Line Style Thick Data Blue 3 Solid Axis Anlr.Level A Left X9408W(10K ohm) Frequency Response 1.4vp 20Hz to 200 kHz on chan 0 AP2 Input Z = 100k ohms MBPWR 8 AN144.0 July 8, 2005 Application Note 144 Response AUDIO PRECISION INTERSIL X9241A CHAN 0 FREQUENCY RESPONSE +2.5 +2 +1.5 +1 d B r A +0.5 +0 -0.5 -1 -1.5 -2 20 50 100 200 500 1k 2k 5k 10k 20k 50k 200k Hz Color Line Style Thick Data Axis Blue Solid 3 Anlr.Level A Left X241y(2K ohms) Frequency Response 1.4vp 20Hz to 200 kHz on chan 0 AP2 Input Z = 100k ohms MBPWR Audio Precision XICOR X9C102 FREQUENCY RESPONSE 05/26/99 14:28:00 AUDIO PRECISION INTERSIL X9C102 FREQUENCY RESPONSE +2.5 +2 +1.5 +1 d B r A +0.5 +0 -0.5 -1 -1.5 -2 20 50 100 200 500 1k 2k 5k 10k 20k 50k 200k Hz Color Line Style Thick Data Axis Blue Solid 3 Anlr.Level A Left X9C102(1K ohms) FREQUENCY RESPONSE 0 dB -- 1.4VP 20Hz TO 200kHz STEP 99 MBPWR 9 AN144.0 July 8, 2005 Application Note 144 Multi-Channel Crosstalk & Level Matching equals 1 bit in the digital representation of an analog audio signal so a number of -120dB corresponds to a 20 bit resolution which is present limit of high-end audio signals. On multi-channel parts like the X924lA and X9408 any interaction between channels where the signal on one channel leaks into the other is undesirable and referred to as crosstalk. To measure crosstalk a 0dB 1kHz signal is inserted into one channel and the other adjacent channel/channels are left floating with no signal present. The floating channels are then measured for any signal content that leaked over from the channel being driven with a signal. The level of the signals measured on the floating channels referenced to the 0dB, 1kHz signal channel is the “Separation” specification number expressed in negative dB. The more negative the number the better the circuit. Where as a high negative number for crosstalk is a very good thing the opposite is true for level matching between channels on multi-channel parts. In this test the same test signal is fed into all the channels of the OUT at the same time. Then each of the individual channel output signals are measured to insure the output signal level of all of the channels match to within a certain dB level (usually 0.5 to 0.05dB in consumer audio equipment). Both of the multichannel Intersil parts (X9408 & X9241A) were exceptional for this measurement. Both of the Intersil parts tested measured very well for crosstalk. The crosstalk numbers expressed in negative dB were over minus –116dB on channels that were at opposite ends of the chip and over -85dB on directly adjacent channels. In audio applications any noise or separation number over -120dB is considered excellent. Every 6dB The X9408 measured slightly better than the X9241A but the difference was so small as to be rendered meaningless. The X9408 worst case channel match between two of the four channels was .09dB and for the X9241A it was 0.ldB. Most of the channels actually matched within 0.01dB! Separation Test Chan 0 to 2 AUDIO PRECISION INTERSIL X9408 SEPARATION TEST CHAN 0 TO 2 d B r +0 -100 A 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Solid 3 Fft.Ch.1 Ampl Left X9408w(10K ohms) Chan 0 to 2 SEP = -110dB 1kHz @ 0dB on 1st chan measuring wiper of 2sd channel. RL gr MBPWR 10 AN144.0 July 8, 2005 Application Note 144 TO 2X9241A CROSSTALK CHAN 0 TO 2 AUDIO PRECISION INTERSIL +0 -20 -40 d B r A -60 -80 -100 -120 -140 -160 -180 20 50 100 200 500 1k 2k 5k 10k 20k Hz Color Line Style Thick Data Axis Blue Solid 3 Fft.Ch.1 Ampl Left X9241y(2k ohms) Chan 0 to 2 SEP = -112dB 1kHz @ 0dB on 1st chan measuring wiper of 2sd channel RL grounded on all Channels. AP2@100k MBPWR Measurement Results Summary X9408 1. Signal to Noise Ratio (SNR): -120dB (AP2 Calc.) 2. Total Harmonic Distortion + Noise (THD+N): -106dB (AP2 Calc.) 3. Frequency Response 20Hz to 20kHz: ± .05dB 4. Two Tone Harmonic Test (18 + 19kHz): -122/-119dB at 1kHz 5. Listen for Zipper noise (Must be below audibility): PASSED 6. Channel Separation Range: -110/-85dB X9241A 1. Signal to Noise Ratio (SNR): -119dB (AP2 Calc.) 2. Total Harmonic Distortion + Noise (THD+N): -102dB (AP2 Calc.) 3. Frequency Response 20Hz to 20kHz: ± .05dB 4. Two Tone Harmonic Test (18 + 19kHz): -108/-99 dB at 1kHz 5. Listen for Zipper noise (Must be below audibility): PASSED 6. Channel Separation: -116/-106dB X9C102 1. Signal to Noise Ratio (SNR): -119dB (AP2 Calc.) 2. Total Harmonic Distortion + Noise (THD+N): -103dB (AP2 Calc.) 3. Frequency Response 20 H~ to 20kHz: ± .05dB 4. Two Tone harmonic Test (18 + 19kHz): -103dB at 1kHz 5. Listen for Zipper noise (Must be below audibility): PASSED 11 AN144.0 July 8, 2005 Application Note 144 X9408w Test Results & Observations Channel Matching The X9408 was the best Intersil part when evaluated for Frequency Response, Noise (SNR and THD+N) and Channel Separation. Below are comments on each of the measurements taken and the effect of each on the audio performance of the part. It should be noted that none of these measurements were weighted. A series of measurements were made with all four channels at different steps (volume levels, see graphs). The worst case measurement at the lowest level setting of –36dB was ± .09dB for all four channels to each other and the other five level settings were better than 0.02dB! This was better than the other multi-channel part in the test, the X9241A, by a wide margin. This is also as good as any multi-channel volume control on the market today. Frequency Response The X9408 exhibited excellent frequency response all the way to the limit of the AP2, 200kHz. The response to 20kHz (the normal audio frequency measurement range limit) is outstanding, ± .005dB. Ten times bandwidth to -3dB is a good rule of thumb when designing high quality audio circuits and the X9408 exceeded that requirement being only ± 0.05dB down at 200kHz! THD+N The THD+N for the four channels on the X9408 with a 1kHz 0 dB reference signal was between 106 and 107dB for all four channels! As you look at the X9408w graph on page 3, notice that there is only one harmonic at 3kHz above -120dB. This level of performance makes this part suitable for all types of consumer audio applications. Conclusions The X9408 exhibits excellent audio frequency performance. In any application where a linear taper level control along with low noise and low harmonic distortion are required, the X9408 is a top notch performer. X9241A Test Results & Observations The X9241A was the second best Intersil part when evaluated for Frequency Response, Noise (SNR and THD+N) and Channel Separation. Below are comments on each of the measurements taken and the effect of each on the audio performance of the part. It should be noted that none of these measurements were weighted. SNR Frequency Response The SNR on the four channels of the X9408 ranged from 118dB to 120dB. In the SNR graphs it can be seen that the dominant noise in the test setup was at 60Hz. If you notch out that signal then the SNR for the four channels falls below 150dB! In either case this spec is more than sufficient for any consumer audio application including high end equipment that uses up to 20 bits of resolution. The X9241A exhibited excellent frequency response all the way to the limit of the AP2, 200kHz. The response to 20kHz (the normal audio frequency measurement range limit) is outstanding, ± .005dB. Ten times bandwidth to -3dB is a good rule of thumb when designing high quality audio circuits and the X9241A exceeded that requirement being only ± 0.05dB down at 200kHz! Two Tone Test THD+N Two 0 dB signals at different frequencies are fed into the DUT and the output is measured by the AP2 from 20Hz to 20kHz. Any harmonics created from the injection of these two signals into the DUT are displayed on a log frequency vs. amplitude graph. The graphs of the four channels show the harmonics created in this test were very low level, on the order of –110dB! The THD+N for the four channels on the X9241A with a 1kHz 0dB reference signal was between 101 and 102dB for all four channels! As you look at the X9241A graph on page 4, notice that there is only one harmonic at 3kHz above -120dB. This level of performance makes this part suitable for all types of consumer audio applications. Crosstalk Noise (i.e. Channel Separation) SNR The level of channel separation on the X9408 depends on which channels are considered. Adjacent channels have less separation (worse number) than channels at opposite ends of the part. The worst measurement was between channels 2 and 3, -85dB, and the best was between channels 2 and 0, -110dB. With proper spacing and layout –110dB is achievable now and is acceptable for nearly all consumer audio. The SNR measured –119dB on four channels of the X9241A. In the SNR graphs it can be seen that the dominant noise in the test setup was at 60Hz. If you notch out that signal then the SNR for the four channels falls below 150dB! In either case this spec is more than sufficient for any consumer audio application including high end equipment that uses up to 20 bits of resolution. Level Switching Noise Listening Test Two Tone Test The X9408 was inserted as a volume control (attenuator to ground) into the signal path of a very high end preamp that directly fed a set of ultra sensitive headphones (Grado). No level switching noise was detected by the listener at all levels. Two 0dB signals at different frequencies are fed into the DUT and the output is measured by the AP2 from 20Hz to 20kHz. Any harmonics created from the injection of these two signals into the DUT are displayed on a log frequency vs. amplitude graph. The graphs of the four channels show 12 AN144.0 July 8, 2005 Application Note 144 the harmonics created in this test were very low level, on the order of –110dB! Crosstalk Noise (i.e. Channel Separation) The level of channel separation on the X9241A depends on which channels are considered. Adjacent channels have less separation (worse number) than channels at opposite ends of the part. The worst measurement was between channels 2 and 3, -106dB (-21dB better than the X9408), and the best was between channels 2 and 0, -116dB (-6dB better than X9408). With proper spacing and layout –116dB is achievable now and is acceptable for nearly all consumer audio. Level Switching Noise Listening Test The X9241A was inserted as a volume control (attenuator to ground) into the signal path of a very high end preamp that directly fed a set of ultra sensitive headphones (Grado). No level switching noise was detected by the listener at all levels. Channel Matching A series of measurements were made with all four channels at different steps (volume levels, see graphs). The worst case measurement was ± 0.1dB for all four channels to each other and the best case was 0.02dB! This is also as good as any multi-channel volume control on the market today. Conclusions The X9241A exhibits excellent audio frequency performance. In any application where a linear taper level control along with low noise and low harmonic distortion are required, the X9241A is a top notch performer. X9C102 Test Results & Observations The X9C102 masurements are discussed below with comments on each of the measurements taken and the effect of each on the audio performance of the part. It should be noted that none of these measurements were weighted. Frequency Response The X9C102 exhibited excellent frequency response all the way to the limit of the AP2, 200kHz. The response to 20kHz (the normal audio frequency measurement range limit) is outstanding, ± 0.005dB. Ten times bandwidth to -3dB is a good rule of thumb when designing high quality audio circuits and the X9C102 exceeded that requirement being only ± 0.05dB down at 200kHz! THD+N The THD+N for X9C102 with a 1kHz 0dB reference signal was between 103dB. As you look at the X9C102 graph on page 5, notice that there is only one harmonic at 3kHz above -120dB. This level of performance makes this part suitable for all types of consumer audio applications. SNR The SNR measured –119dB on the X9C102. In the SNR graphs it can be seen that the dominant noise in the test setup was at 60Hz. This spec is more than sufficient for any consumer audio application including high end equipment that uses up to 20 bits of resolution. Two Tone Test Two 0 dB signals at different frequencies are fed into the DUT and the output is measured by the AP2 from 20Hz to 20kHz. Any harmonics created from the injection of these two signals into the DUT are displayed on a log frequency vs. amplitude graph. The graphs show the harmonics created in this test were very low level, on the order of –103dB! Level Switching Noise Listening Test The X9C102 was inserted as a volume control (attenuator to ground) into the signal path of a very high end preamp that directly fed a set of ultra sensitive headphones (Grado). No level switching noise was detected by the listener at all levels. Conclusions The X9C102 exhibits excellent audio frequency performance. In any application where a linear taper level control along with low noise and low harmonic distortion are required, the X9C102 is a top notch performer. 13 AN144.0 July 8, 2005 Application Note 144 Appendix AUDIO PRECISION INTERSIL X9408 4 CHANNEL LEVEL MATCHING AT SIX DIFFERENT LEVEL SETTINGS +0 d B r -20 A -40 2k 4k 6k 8k 10k 12k 14k 16k 18k 20k Hz Color Line Style Thick Data Axis Cyan Green Yellow Solid Solid Solid 1 1 1 Anlr.LevelA Anlr.LevelA Anlr.LevelA Left Left Left X9408 Frequency Response ALL 4 CHANS STEP 31 = -6dB, STEP20=-10dB, STEP 10=--16dB, STEP5=-22dB, STEP 2=--30dB, STEP 1=-38dB. LAST STEP PURPLE =3, BLUE=2, CYAN=1, GREEN=0 Spread @ -6dB = ±.02dB, @ -10dB = ±.015dB, @ -16dB = ±.01dB, @-22dB = ±.01dB, @-30dB = ±.012dB, @-36dB = ±.09dB, 1.4vp20Hz to 200kHz on chan 0 AP2 Input Z = 100kΩ, MB PWR AUDIO PRECISION INTERSIL X9241A ALL CHAN FREQUENCY RESPONSE +5 +0 -5 -10 d B V -15 -20 -25 -30 -35 -40 20 50 100 200 500 1k 2k Hz Color Line Style Thick Data Axis Cyan Green Yellow Solid Solid Solid 3 3 3 Anlr.LevelA Anlr.LevelA Anlr.LevelA Left Left Left 5k 10k 20k 50k 200k X241y(2kΩ) Frequency Response ALL 4 CHANNELS TOGETHER - STEP 10 0=CYAN, 1=GREEN, 2=YELLOW, 3=RED 1.4vp20Hz to 200kHz on chan 3 AP2 Input Z = 100kΩ, MB PWR 14 AN144.0 July 8, 2005 Application Note 144 Appendix Audio Precision XICOR X9241 ALL CHANS Frequency 05/21/99 11:09:19 Response AUDIO PRECISION INTERSIL X9241A ALL CHANS FREQUENCY RESPONSE AT Six Different Level Settings + 0.4 + 0.2 d B r A -0 -0.2 -0.4 20 50 100 200 500 1k 2k Hz Color Line Style Thick Data Axis Cyan Green Yellow Solid Solid Solid 3 3 3 Anlr.LevelA Anlr.LevelA Anlr.LevelA Left Left Left 5k 10k 20k 50k 200k X241y(2kΩ) Frequency Response ALL 4 CHANNELS TOGETHER 0=CYAN, 1=GREEN, 2=YELLOW, 3=RED 1.4vp20Hz to 200kHz on chan 3 @ step 63 AP2 Input Z = 100kΩ, MB PWR X9408-Total Harm onic Distortion + Noise vs. In put Voltage & DCP Position 0.0 -20.0 -40.0 1vPeak @ 1kH z -60.0 2vPeak @ 1kH z 3vPeak @ 1kH z -80.0 4vPeak @ 1kH z 5vPeak @ 1kH z -100.0 -120.0 63 60 55 50 45 40 35 30 25 20 15 10 5 4 3 2 1 D C P P osition # For more information please refer to datasheets X9408, X9421 and X9C102/103/104/503 at www.intersil.com Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 15 AN144.0 July 8, 2005