User's Guide
SLAU742 – March 2018
Analog Crossover Audio Plug-In Module
The TI Analog Crossover Audio Plug-in Module (SIDEGIG-XOVEREVM) turns TI Audio Class-D amplifier
EVM’s into a high quality, two-way speaker amplifier. The plug-in module makes it easy to remove the
large and expensive passive crossover found in passive loudspeakers and create a bi-amped, two-way
system with improved efficiency and reduced size. The board features a tunable active crossover with a
high-pass filter, low-pass filter, baffle step, and delay to create two audio output signals for a tweeter and
woofer. There are many advantages of designing active speakers including well-matched and well-tuned
audio. This audio plug-in module plugs into an analog input Class-D audio evaluation module (EVM) with
an audio interface board (AIB) connector. This document provides information including setup, operation,
schematics, bill of materials (BOM) and printed-circuit board (PCB) layout. For questions and support, visit
the E2E forums: www.e2e.ti.com.
The main contents of this document are:
• Hardware description
• Hardware implementations
• Design documents
Figure 1. Analog Crossover Audio Plug-In Module
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1
2
3
Contents
Hardware Overview.......................................................................................................... 3
Analog Crossover Plug-In Module Setup ................................................................................ 7
Design Files ................................................................................................................ 16
List of Figures
................................................................................
1
Analog Crossover Audio Plug-In Module
2
Analog Crossover Module Block Diagram ................................................................................ 3
3
Class-D Output Drawings
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
1
.................................................................................................. 4
AIB Connector Pinout ....................................................................................................... 5
Connecting Audio Crossover Plug-in Module ............................................................................ 8
Analog Crossover Plug-in Module Controls ............................................................................. 8
Low-Pass Filter Schematic ................................................................................................. 9
Low-Pass Filter Frequency Response................................................................................... 10
Baffle-Step Compensation (BSC) Schematic........................................................................... 11
Low-Pass Filter Frequency Response Without Baffle-Step Compensation ........................................ 11
Low-Pass Filter Frequency Response With Baffle-Step Compensation ............................................ 11
High-Pass Filter Schematic ............................................................................................... 12
High-Pass Filter Frequency Response .................................................................................. 12
Cross Section of Two-Way Loudspeaker Requiring Delay Compensation ......................................... 13
All-Pass Filter Schematic.................................................................................................. 14
Example of All-Pass Filter Delay ......................................................................................... 15
SIDEGIG-XOVEREVM Schematic Page 1 ............................................................................. 16
SIDEGIG-XOVEREVM Schematic Page 2 ............................................................................. 17
Top Overlay ................................................................................................................. 18
Bottom Overlay ............................................................................................................. 18
SIDEGIG-XOVEREVM Board Dimensions ............................................................................. 18
List of Tables
.............................................................................................. 3
.......................................................................................... 5
Component Values for Different Low-Pass Filter Cutoff Frequencies .............................................. 10
Component Values for Different High-Pass Filter Cutoff Frequencies ............................................. 13
1
Plug-in Module Compatibility
2
AIB Connector Pin Descriptions
3
4
5
Approximate Additional Time Delays With Corresponding Component Values and Approximate
Frequency When Delay Decreases by 10% ........................................................................... 15
6
BOM .......................................................................................................................... 19
Trademarks
All trademarks are the property of their respective owners.
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1
Hardware Overview
The Analog Crossover Plug-in Module allows an audio Class-D amplifier to drive separate bass and
tweeter channels from a single RCA input source.
The board includes an input volume control, high-pass filter, low-pass filter with optional baffle step
compensation, optional all-pass filter for delay adjustment, as well as standard banana plug jacks for an
external power supply (see Figure 2). A single RCA jack is used for input to the board.
Fourth-Order
High-Pass Filter
Third-Order
All-Pass Time
Delay
Attenuation
and Buffering
Tweeter
Output
Audio
Input
Input
Buffer
Woofer
Output
Baffle-Step
Compensation
Fourth-Order
Pass Filter
Figure 2. Analog Crossover Module Block Diagram
1.1
Features
The analog crossover module includes the following features:
• Compatible with the TI Audio Plug-in Module Ecosystem
• Standard RCA input jack
• Self-powered when connected to an audio Class-D EVM
• Differential outputs for both high and low channels which can directly drive the audio Class-D EVM
• Standard banana plug jacks for using an optional, external dual-rail supply for the board
• Potentiometers for input volume control as well as separate high- and low-channel volume control
• Fourth-order active high-pass filter
• Optional fourth-order active low-pass filter
• Optional baffle-step compensation
• Optional all-pass filter for delay adjustment
• Supports two-channel bridge-tied load (BTL) Class-D amplifier output
1.2
Class-D EVM Compatibility
The Analog Crossover Plug-in Module is compatible with analog input Class-D EVMs designed with the
audio interface board (AIB) connector. See the SIDEGIG-XOVER tools folder on TI.com for a list of
compatible Class-D EVMs.
Table 1. Plug-in Module Compatibility
PLUG-IN MODULE OUTPUT TYPE
CLASS-D EVM INPUT TYPE
SUPPORTED CLASS-D SPEAKER
CONFIGURATIONS
2x differential analog
Analog
2x BTL
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1.2.1
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Audio Plug-In Module Output Types
The Analog Crossover Plug-in Module drives two differential analog outputs.
1.2.2
Class-D EVM Input Type
The Analog Crossover Plug-in Module is only compatible with analog input Class-D EVMs with the AIB
connector.
1.2.3
Supported Class-D Speaker Configurations
Configure the connected Class-D EVM as a stereo BTL output because the Analog Crossover Plug-in
Module has two differential outputs (see Figure 3).
OUT-A
OUT-B
Class-D
Amplifier
OUT-C
OUT-D
2x BTL
Figure 3. Class-D Output Drawings
NOTE: Consult the Class-D EVM user’s guide for proper Class-D EVM configuration.
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1.3
AIB Pinout
This section shows the AIB connector pinout used by the Analog Crossover Audio Plug-in Module (see
Figure 4). Any pin names not listed in Table 2 are unused by this plug-in module.
Amp Out A 1
2 Amp Out B
3
4 GND
5
6
7
8
+12V 9
10
Analog IN_A / MCLK 11
12
Analog IN_B / BLCK 13
14
Analog IN_C / LRCLK 15
16
Analog IN_D / DIN 17
18
19
20
GND 21
22 GND
23
24
25
26
Amp Out C 27
28 Amp Out D
Figure 4. AIB Connector Pinout
Table 2. AIB Connector Pin Descriptions
AUDIO EVM
INPUT/OUTPUT
AUDIO PLUG-IN
MODULE
INPUT/OUTPUT
Speaker-level output from audio Class-D EVM
(single-ended (SE) or one side of BTL); used for
post-filter feedback
O
I
Speaker-level output from audio Class-D EVM (SE
or one side of BTL); used for post-filter feedback
O
I
GND
Ground reference between audio plug-in module
and audio Class-D EVM
—
—
9
12V
12-V supply from EVM; used for powering audio
plug-in module
O
I
11
Analog IN_A
Positive (+) analog input Class-D EVM (IN_A and
IN_B are driven differentially by the Analog
Crossover Plug-in Module)
I
O
13
Analog IN_B
Negative (–) analog input for high-frequency
channel to audio Class-D EVM (IN_A and IN_B are
driven differentially by the Analog Crossover Plugin Module)
I
O
Analog IN_C
Postive (+) analog input for low-frequency channel
to audio Class-D EVM (IN_C and IN_D are driven
differentially by the Analog Crossover Plug-in
Module)
I
O
Analog IN_D
Negative (–) analog input for low-frequency
channel to audio Class-D EVM (IN_C and IN_D are
driven differentially by the Analog Crossover Plugin Module)
I
O
PIN NUMBER
FUNCTION
1
AMP-INA
2
AMP-INB
4
15
17
DESCRIPTION
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Table 2. AIB Connector Pin Descriptions (continued)
6
AUDIO EVM
INPUT/OUTPUT
AUDIO PLUG-IN
MODULE
INPUT/OUTPUT
Ground reference between audio plug-in module
and audio Class-D EVM
—
—
Ground reference between audio plug-in module
and audio Class-D EVM
—
—
AMP-INC
Speaker-level output from audio Class-D EVM (SE
or one side of BTL); used for post-filter feedback
O
I
AMP-IND
Speaker-level output from audio Class-D EVM (SE
or one side of BTL); used for post-filter feedback
O
I
PIN NUMBER
FUNCTION
21
GND
22
GND
27
28
DESCRIPTION
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Analog Crossover Plug-In Module Setup
This section describes the setup and use of the Analog Crossover Audio Plug-in Module.
2.1
Preparation and First Steps for Setup
The Analog Crossover Audio Plug-in Module plugs into an analog input audio Class-D EVM using the AIB
connector.
To plug the board in, simply align the AIB connector on the Analog Crossover Plug-in Module and the
audio EVM and press into place. No additional setup is required. The plug-in module automatically powers
up when the Class-D EVM is powered.
1. Configure the Class-D amplifier EVM in BTL output mode to support the analog crossover module.
2. While the Class-D amplifier EVM is not powered, connect the analog crossover module to the AIB
connector (see Figure 5). Take care not to misalign the connector, otherwise damage to the plug-in
module or Class-D EVM can occur.
3. Connect the EVM A/AB BTL channel to a tweeter or mid-range speaker channel.
4. Connect the EVM C/CD BTL channel to a bass speaker channel.
5. Make sure that J10 (“VCC SEL”) is connected to the U10 pin and that J11 (“VEE SEL”) is connected to
the U11 pin. Power the Class-D EVM and the plug-in module is automatically powered. The plug-in
module provides its own +10-V and –10-V supply rails. However, if the designer wishes to increase the
supply rails with an external supply to increase the maximum output available from the plug-in module,
follow steps 5a through 5f; otherwise, proceed to step 6.
1. Connect the ground of the external supply to the banana jack labeled “GND” on the plug-in
module.
2. Connect the positive supply line of the external supply to the banana jack labeled “Vcc” on the
plug-in module. Note the absolute maximum voltage of 18 V on this pin. Do not exceed this level;
otherwise, damage may occur to the plug-in module.
3. Connect the negative supply line of the external supply to the banana jack labeled “Vee” on the
plug-in module. Note the absolute minimum voltage of –18 V on this pin. Do not exceed this level;
otherwise, damage may occur to the plug-in module.
4. Move the jumper on VCC SEL to the J7 pin.
5. Move the jumper on VEE SEL to the J8 pin.
6. Turn on the external power supply.
6. Plug in a standard RCA cable into the plug-in module.
7. Adjust the potentiometers for each channel to set the overall desired volume.
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Figure 5. Connecting Audio Crossover Plug-in Module
2.2
Analog Crossover Plug-In Module Controls and Circuits
This subsection describes the controls and use of the Analog Crossover Audio Plug-in Module. Figure 6
shows the Analog Crossover Plug-in Module controls.
Figure 6. Analog Crossover Plug-in Module Controls
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2.2.1
Low-Pass Filter
The optional fourth-order low-pass filter attenuates all signals with frequencies above a certain cutoff,
which is determined by the component values. The low-pass filter circuit also includes R42 for its own
separate volume control. Connect the jumper on J5 to "Bypass" instead of "Enable" to bypass the lowpass filter together with the BSC circuit.
Figure 7 shows the schematic of the low-pass filter.
LOW-PASS FILTER
C22
0.1µF
7
1.40k
6
R39
Low
Frequency
(Woofer)
845
1.40k
U8A
OPA1602
3
1
VEE
2
C25
0.047µF
R42
U8B
OPA1602
5
8
8
C24
0.047µF
R38
4
U7B
OPA1602
5
4
4
0.1µF
R37
LPF
DNP
DNP
TP3
C23
7
10k
6
8
VCC
GND
GND
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 7. Low-Pass Filter Schematic
Tthe low-pass filter circuit comprises two second-order Sallen-Key low-pass filters (U7B and U8A), which
combine together to produce a fourth-order low-pass filter. R36 = R38, R37 = R39, C22 = C23, and C24 =
C25; therefore, the transfer function for the low-pass filter can be written as follows in Equation 1.
æ
1
H (s ) = ç
ç 1 + sC (R + R ) + s2 R R C C
24
36
37
36 37 22 24
è
ö
÷
÷
ø
2
(1)
The following Equation 2 gives the cutoff frequency for the low-pass filter.
1
ƒc =
2p R36 R37 C22 C24
(2)
When using the component values as shown in the Figure 7 schematic, the low-pass filter has a cutoff
frequency of approximately 2.1 kHz. As is the case with the high-pass filter, change the corresponding
components on each filter if a change to the cutoff frequency is desired. So, if changing the value of R37,
then be sure to also change R39 to the same value.
Just like the previous high-pass filter, each of the second-order filters in the low-pass filter circuit has a Q
factor, which determines how much peaking occurs in the frequency response of the circuit around the
cutoff frequency. As before, the value of the Q factor must be kept below 1 and roughly above 0.5, but
should preferably be around 0.7. The current value of the Q factor for each second-order low-pass filter is
0.707. The following Equation 3 gives the Q factor.
Q=
R37 C22 C24
(C22
+ C24 ) R36
(3)
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Figure 8 shows the frequency response of the low-pass filter on the plug-in module.
10
0
Magnitude (dB)
-10
-20
-30
-40
-50
-60
20
200
2000
Frequency (Hz)
20000
D002
Figure 8. Low-Pass Filter Frequency Response
Table 3 shows some of the suggested component values for different cutoff frequencies for the low-pass
filter.
Table 3. Component Values for Different Low-Pass Filter Cutoff Frequencies
2.2.2
HIGH-PASS FILTER COMPONENT VALUES
APPROXIMATE CUTOFF
FREQUENCY
R36 AND R38
R37 AND R39
C22 AND C23
Cx4 AND C25
300 Hz
6.01 kΩ
10.00 kΩ
100 nF
47 nF
600 Hz
3.01 kΩ
4.99 kΩ
100 nF
47 nF
900 Hz
2.00 kΩ
3.32 kΩ
100 nF
47 nF
1200 Hz
1.50 kΩ
2.49 kΩ
100 nF
47 nF
1500 Hz
1.21 kΩ
2.00 kΩ
100 nF
47 nF
1800 Hz
1.00 Ω
1.65 kΩ
100 nF
47 nF
2100 Hz
866 Ω
1.43 kΩ
100 nF
47 nF
Baffle-Step Compensation
The optional baffle-step compensation (BSC) circuit allows correction of the frequency response of the
woofer. Due to the physical construction of loud speakers, high frequencies are directed forward to the
listener, while low frequencies are not only directed forward, but also pass around the speaker to the rear.
This relationship causes higher frequencies to sound louder. Baffle-step compensation is required in loud
speakers to reduce the sound pressure of those higher frequencies compared with lower frequencies. The
BSC flattens the sound pressure level across frequencies for a better listening experience. The BSC is
optional and the designer can disable this by removing the jumper across J6 (labeled “Baffle Step”), in
which case the circuit becomes a unity-gain inverting amplifier.
Figure 9 shows the schematic for the BSC circuit.
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R28
11.8k
J6
Step Baffle
C19
R31
11.8k
0.1µF
R34
11.8k
8
VCC
U7A
OPA1602
2
1
3
DNP
DNP
TP4
SB
4
VEE
GND
BAFFLE STEP
COMPENSATION
Copyright © 2016, Texas Instruments Incorporated
Figure 9. Baffle-Step Compensation (BSC) Schematic
The BSC circuit has the following transfer function shown in Equation 4.
ö
R æ 1 + sR31 C19
H (s ) = - 34 ç
÷÷
ç
R28 è 1 + s (R34 R31 )C19 ø
(4)
Equation 5 and Equation 6 give the pole and zero frequencies, respectively.
1
ƒp =
2p (R34 + R31 )C19
(5)
ƒz =
1
2p R31 C19
(6)
When using the current component values, as shown in Figure 9, the pole and zero frequencies of the
BSC are 67.4 Hz and 134.9 Hz, respectively.
10
10
0
0
-10
-10
Magnitude (dB)
Magnitude (dB)
Figure 10 and Figure 11 show the frequency response with and without the BSC.
-20
-30
-20
-30
-40
-40
-50
-50
-60
20
200
2000
Frequency (Hz)
20000
Figure 10. Low-Pass Filter Frequency Response
Without Baffle-Step Compensation
-60
20
D002
200
2000
Frequency (Hz)
20000
D003
Figure 11. Low-Pass Filter Frequency Response
With Baffle-Step Compensation
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High-Pass Filter
The fourth-order high-pass filter attenuates all signals with frequencies below a certain cutoff, which is
determined by the filter component values.
The high-pass filter schematic in Figure 12 comprises two second-order Sallen-Key high-pass filters (U1B
and U2A), which combine to create a fourth-order filter and provide a rapid attenuation at frequencies
below the cutoff. R1 = R2, R10 = R11, C3 = C5, and C4 = C6; therefore, the transfer function for the highpass filter can be written as follows in Equation 7.
æ
s2 R1 R10 C3 C4
H (s ) = ç
ç 1 + sR (C + C ) + s2 R R C C
1
3
4
1 10 3 4
è
ö
÷
÷
ø
2
(7)
The following Equation 8 gives the cutoff frequency of the filter.
1
ƒc =
2p R1 R10 C3 C4
R1
R2
590
590
(8)
U1B
OPA1602
C4
5
C5
U2A
OPA1602
C6
7
0.1µF
0.1µF
3
6
1
R10
1.30k
0.1µF
8
0.1µF
2
R11
1.30k
VCC
8
C3
4
4
VEE
GND
HIGH-PASS FILTER
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 12. High-Pass Filter Schematic
Using the component values as shown in the previous Figure 12 schematic, the filter has a cutoff
frequency of approximately 1.8 kHz. The designer can modify the cutoff frequency if desired by changing
one of the components on the first filter and the corresponding component on the second filter. For
example, if changing the value of R10, then be sure to change R11 to the same value.
Figure 13 shows the frequency response of the high-pass filter.
10
0
Magnitude (dB)
-10
-20
-30
-40
-50
-60
-70
20
200
2000
Frequency (Hz)
20000
D001
Figure 13. High-Pass Filter Frequency Response
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The Q factor for each second-order filter is another value that is important to the filter functionality and it
determines how much and how sharply the frequency response of the filter peaks around the cutoff
frequency. The Q factor must be less than 1 to reduce this peaking, but it must also be kept above 0.5.
Keeping the Q factor around 0.7 is preferable and the current Q factor for the high-pass filter is 0.742.
Equation 9 shows the Q factor of each second-order filter.
Q=
R1 R10 C3
(R1 + R10 )
C4
(9)
Table 4 shows some suggested component values for different cutoff frequencies for the high-pass filter.
Table 4. Component Values for Different High-Pass Filter Cutoff Frequencies
2.2.4
HIGH-PASS FILTER COMPONENT VALUES
APPROXIMATE CUTOFF
FREQUENCY (Hz)
R1 AND R2
R10 AND R11
C3 AND C5
C4 AND C6
300
3.57 kΩ
7.87 kΩ
100 nF
100 nF
600
1.75 kΩ
3.92 kΩ
100 nF
100 nF
900
1.18 kΩ
2.61 kΩ
100 nF
100 nF
1200
887 Ω
1.96 kΩ
100 nF
100 nF
1500
715 Ω
1.58 kΩ
100 nF
100 nF
1800
590 Ω
1.3 kΩ
100 nF
100 nF
2100
511 Ω
1.1 kΩ
100 nF
100 nF
All-Pass Filter
Use the optional all-pass filter to add a specific time delay to the high-frequency signal path so that the
high-channel and low-channel sounds can be matched in time to compensate for any delay that results
from distance offsets between the tweeter and the woofer transducers. Figure 14 shows a physical
representation of this alignment difference.
A
B
P
C
D
Figure 14. Cross Section of Two-Way Loudspeaker Requiring Delay Compensation
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Enable the all-pass filter by connecting the jumper on J1 (labeled “Delay”) to the “EN” pin. If the J1 Delay
jumper remains connected to the “Bypass” pin, the all-pass filter is skipped, no delay is added, and the
output from the high-pass filter functions as the only output for the high channel. Control the level of the
high-pass output through the potentiometer R24 at the output of the all-pass filter.
Figure 15 shows the schematic of the all-pass filter.
APF
DNP
DNP
TP2
C9
R52
R18
1.00k
1.00k
C10
0.1µF
10pF
VCC
1
3
R21
221
C11
6
7
0.1µF
5
R22
U6A
OPA1602
2
R23
1
475
3
1.00k
R24
4
4
4
VEE
High
Frequency
(Tweeter)
1.00k
U5B
OPA1602
8
2
R20
422
8
8
R19
U5A
OPA1602
GND
C12
0.1µF
R25
R26
332
1.00k
1k
GND
R27
1.00k
ALL-PASS FILTER
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 15. All-Pass Filter Schematic
The transfer function of the all-pass filter is a third-order function. The all-pass filter passes the signal with
a constant gain. However, for the gain on the all-pass filter to stay at unity, R52 must equal R18 and R20
must equal R26.
The purpose of the all-pass filter is to add in a time delay to the high-frequency signal; therefore, the
formula for the time delay added by the all-pass filter as a function of frequency is given in Equation 10.
To simplify the equation, first make a few assumptions about the circuit. Assume that R52 and R18 are
always the same value, C9 and C11 are always the same value, R26 and R20 are the same value as
well, and that R26 and R20 remain unchanged. Also, the first-order low-pass filter created by U6A has a
cutoff frequency of approximately 16 MHz; therefore, assume that it remains unmodified and that its
contribution to the time delay is negligible and can be ignored. After making these assumptions, simplify
the time delay function to the following Equation 10.
æ
ö
2R25 C12
2R21 C9
16p2 R221 R19 C39 ƒ 2 ÷
ç
1
t (ƒ ) =
+
+
2
2 ç
2
2 2
2÷
p
1
4
R
R
C
ƒ
1 + (2p R25 C12 ƒ )
æ
ö
21
19
9
ç
4p R21 C9 ƒ
1 - 4p2 R21 R19 C92 ƒ 2 ÷
ø
1+ ç
÷ è
ç 1 - 4 p2 R R C2 ƒ 2 ÷
21 19 9
è
ø
æé
ö
ù
é
ù
R26
R
R19 ú C9 8p2 ê2R21 - 26 R19 ú R21 R19 C39 ƒ 2 ÷
ç ê2R21 R22
R22
1
û
ë
û
çë
÷
+
2
2 2
2
2 ç
÷
2
2
2
p
1
4
R
R
C
ƒ
æ
ö
é
ù
21 19 9
R26
1 - 4p R21 R19 C9 ƒ
ç
÷
p
2
2R
R
C
ƒ
÷
ç
÷ ç
ê 21
ú
ø
R22 19 û 9 ÷ è
ë
1+ ç
ç 1 - 4 p2 R R C2 ƒ 2 ÷
21 19 9
ç
÷
ç
÷
è
ø
(
(
)
)
(10)
Find the approximate value for the low-frequency time delay by setting f = 0 in Equation 10. Using the
current component values as shown in Figure 15, the all-pass filter has a delay of approximately 155 μs.
Table 5 also provides a few suggested component values for varying amounts of delay.
14
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Table 5. Approximate Additional Time Delays With Corresponding Component Values and
Approximate Frequency When Delay Decreases by 10%
COMPONENT VALUES
APPROXIMATE
TIME DELAY
R52 AND R18
C12
R25
R21
C9 AND C11
R19
R22
R26 AND R20
ESTIMATED FREQUENCY FOR
10% DROP IN DELAY
30 µS
1000 Ω
10 nF
649 Ω
422 Ω
10 nF
806 Ω
475 Ω
1000 Ω
20300 Hz
60 µS
1000 Ω
22 nF
590 Ω
383 Ω
22 nF
732 Ω
475 Ω
1000 Ω
10100 Hz
90 µS
1000 Ω
47 nF
412 Ω
576 Ω
22 nF
1100 Ω
475 Ω
1000 Ω
6750 Hz
120 µS
1000 Ω
47 nF
549 Ω
365 Ω
47 nF
698 Ω
475 Ω
1000 Ω
5050 Hz
150 µS
1000 Ω
100 nF
324 Ω
453 Ω
47 nF
866 Ω
475 Ω
1000 Ω
4050 Hz
180 µS
1000 Ω
100 nF
442 Ω
287 Ω
100 nF
456 Ω
499 Ω
1000 Ω
4300 Hz
210 µS
1000 Ω
100 nF
499 Ω
324 Ω
100 nF
549 Ω
499 Ω
1000 Ω
3450 Hz
240 µS
1000 Ω
100 nF
604 Ω
383 Ω
100 nF
604 Ω
499 Ω
1000 Ω
3200 Hz
270 µS
1000 Ω
100 nF
681 Ω
432 Ω
100 nF
681 Ω
499 Ω
1000 Ω
2850 Hz
Figure 16 shows an example of added phase delay by the all-pass filter block to the high-frequency
channel.
Figure 16. Example of All-Pass Filter Delay
NOTE: The input signal (yellow) is a 1.8-kHz sine wave and the output from the analog crossover
module is shown in pink.
See more information about how to determine the necessary time delay, as well as more information
about the analog crossover module, in Analog, Active Crossover Circuit for Two-Way Loudspeakers
(TIDU035).
2.2.5
Input
The input to the Analog Crossover Plug-in Module is a single channel, single-ended audio source.
2.2.6
Volume Knob
Control the master volume on the analog crossover module with R17, which is the potentiometer next to
the RCA input jack.
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Design Files
3
Design Files
3.1
Schematic
www.ti.com
Figure 17 and Figure 18 show the SIDEGIG-XOVEREVM schematics.
Power Supply Inputs
+10V REGULATOR
+12V-AIB
VCC-EXT
J7
J8
Vcc
Vee
8
C30
4.7 µF
C29
10µF
C32
C31
4.7 µF
GND
IN
5
GND
GND
FB
VCC
VCC-EXT
J10
C28
0.01 µF
NC
VCC SEL
R46
2
Voltage Rail Select
88.7k
DNC
3
1
2
3
1
NR/SS
7
Vcc MAX = +18V
Vee MAX = -18V
GND
OUT
EN
6
0.01 µF
J9
+10V
+10V
U10
VEE-EXT
GND
PAD
R47
12.0k
4
9
C33
10µF
-10V
VEE
VEE-EXT
J11
TPS7A4901DRBR
1
2
3
GND
GND
GND
VEE SEL
GND
Negative Charge Pump
-10V REGULATOR
-11.5V
-10V
U11
-11.5V
U12A
3
C36
10µF
4
6
+12V-AIB
FB/SD
VOUT
CAP+
CAP-
VREF
VCC
12
13
R48
R49
20.0k
220k
C34
10µF
C37
5
GND
GND
NC
NC
NC
NC
0.01 µF
GND
GND
U12B
1
2
7
8
NC
NC
NC
NC
5
EN
1
OUT
C35
0.01 µF
2
FB
6
C38
100 µF
LT1054CDW
C40
2.2 µF
IN
11
OSC
14
8
7
DNC
3
R51
10.0k
4
9
GND
PAD
NC
GND
R50
75.0k
NR/SS
C39
10µF
TPS7A3001DRBR
GND
9
10
15
16
GND
GND
LT1054CDW
GND
GND
8
VCC
8
VCC
U3B
OPA1602
6
U6B
OPA1602
6
7
7
5
5
4
VEE
4
VEE
GND
GND
Figure 17. SIDEGIG-XOVEREVM Schematic Page 1
16
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4
VEE
Input
TP1
R1
R2
590
590
R4
C3
C4
0.1 µF
0.1 µF
7
U1B
OPA1602
5
5
Volume
C5
C6
0.1 µF
0.1 µF
7
OUTA
0
R6
100k
1.00k
VCC
U2A
OPA1602
3
6
R7
1
R10
1.30k
2
R11
1.30k
3
R9
1
V+
8
1.00k
VCC
GND
5
VOUT-
VOCM
1
1.00k
GND
GND
VIN+
2
R12
8
GND
HIGH PASS FILTER
U4
VEE
U3A
OPA1602
3
11.8k
2
8
GND
6
R17
20K
4
VCC
8
GND
180pF
C2
AMP-INB
8
R8
10.0k
Analog IN
U2B
OPA1602
R5
4
8
2
R3
C1
220pF
7.50k
J1
DELAY
EN/BYPASS
VEE
1
4
U1A
OPA1602
3
1
2
3
3
4
1
4
J2
VIN-
7
OUTB
0
9
EP
GND
R13
4
VOUT+
ENABLE
R14
100k
6
V-
OPA1632DGNR
GND
GND
C7
AMP-INA
R18
1.00k
180pF
C10
220pF
R15
R16
APF
TP2
C9
R52
1.00k
C8
7.50k
0.1 µF
VEE
1.00k
VCC
10pF
J3
R19
R20
422
1.00k
2
C11
R21
1
3
U5B
OPA1602
8
U5A
OPA1602
8
8
VCC
6
R22
7
221
0.1 µF
5
U6A
OPA1602
2
GND
R23
1
475
3
1.00k
1
3
5
7
9
11
13
15
17
19
21
23
25
27
AMP-INA
C16
0.1 µF
+12V-AIB
OUTA
OUTB
OUTC
OUTD
GND
R24
4
4
4
VEE
C15
0.1 µF
High
Freq
(Tweeter)
GND
C12
0.1 µF
R25
R26
332
1.00k
1k
GND
AMP-INC
R27
1.00k
AMP-INB
AMP-IND
AIB
ALL PASS FILTER
GND
2
4
6
8
10
12
14
16
18
20
22
24
26
28
GND
VEE
GND
VCC
J4
VEE
VCC
GND
C17
0.1 µF
VEE
VCC
VEE
VCC
VEE
VCC
VEE
VCC
VEE
VCC
VEE
VCC
C13
0.1 µF
C14
0.1 µF
C41
0.1 µF
C42
0.1 µF
C44
0.1 µF
C43
0.1 µF
C46
0.1 µF
C45
0.1 µF
C49
0.1 µF
C50
0.1 µF
C51
0.1 µF
C52
0.1 µF
GND
R34
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
LOW PASS FILTER
C22
C21
180pF
LPF
TP3
C23
U9
VEE
3
845
4
VEE
TP4
SB
U7B
OPA1602
5
7
1.40k
6
R38
845
C24
0.047 µF
R39
U8A
OPA1602
3
1
1.40k
Low
Freq
(Woofer)
R40
2
C25
0.047 µF
R42
VOUT-
5
VOCM
VIN-
VOUT+
R41
4
OUTD
0
7
ENABLE
GND
7
10k
1
GND
VIN+
1.00k
U8B
OPA1602
5
2
V+
EP
V-
6
9
R43
100k
6
OPA1632DGNR
VCC
GND
8
BAFFLE STEP
COMPENSATION
8
1.00k
VEE
8
GND
R37
R35
4
R36
1
4
2
0.1 µF
4
0.1 µF
8
8
3
U7A
OPA1602
OUTC
R33
100k
1.00k
VCC
GND
0
R32
GND
AMP-IND
11.8k
C48
0.1 µF
R29
C20
220pF
7.50k
11.8k
VCC
GND
R30
R31
0.1 µF
C47
0.1 µF
GND
GND
Step Baffle
C19
C18
0.1 µF
J5
LPF
EN/BYPASS
J6
1
2
3
R28
11.8k
GND
GND
C26
GND
AMP-INC
C27
GND
180pF
R45
220pF
R44
7.50k
1.00k
Figure 18. SIDEGIG-XOVEREVM Schematic Page 2
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Design Files
3.2
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Board Layouts
Figure 19 and Figure 20 show the SIDEGIG-XOVEREVM layout images.
Figure 19. Top Overlay
3.3
Figure 20. Bottom Overlay
Board Dimensions
Figure 21 shows the SIDEGIG-XOVEREVM board dimensions.
Figure 21. SIDEGIG-XOVEREVM Board Dimensions
18
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3.4
Bill of Materials
Table 6 shows the SIDEGIG-XOVEREVM BOM.
Table 6. BOM
DESIGNATOR
!PCB1
C3, C4, C5, C6, C9,
C11, C12, C19,
C22, C23
C10
C14,
C17,
C42,
C45,
C48,
C51,
VALUE
1
C1, C7, C20, C26
C13,
C16,
C41,
C44,
C47,
C50,
QTY
C15,
C18,
C43,
C46,
C49,
C52
C24, C25
C28, C35
PACKAGE
REFERENCE
DESCRIPTION
Printed Circuit Board
4
220pF
10
0.1uF
CAP, CERM, 220 pF, 50 V,+/- 1%, C0G/NP0, 0402
PART NUMBER
MANUFACTURER
AMPS004
Any
0402
C1005C0G1H221F050B
A
TDK
1206
C1206C104J3GACTU
Kemet
0603
06035A100JAT2A
AVX
0603
0603YC104JAT2A
AVX
1
10pF
18
0.1uF
CAP, CERM, 10 pF, 50 V,+/- 5%, C0G/NP0, 0603
CAP, CERM, 0.1 µF, 16 V,+/- 5%, X7R, 0603
2
0.047uF
CAP, CERM, 0.047 µF, 50 V,+/- 5%, C0G/NP0, 1206
1206
GRM31M5C1H473JA01L
MuRata
2
0.01uF
CAP, CERM, 0.01 µF, 10 V,+/- 10%, X7R, AEC-Q200 Grade
1, 0201
0201
CGA1A2X7R1A103K030
BA
TDK
Wurth Elektronik
4
10uF
CAP, CERM, 10 µF, 25 V,+/- 10%, X7R, 1206
1206
885012208069
C30, C31
2
4.7uF
CAP, CERM, 4.7 µF, 16 V,+/- 10%, X5R, 1206
1206
C1206C475K4PACTU
Kemet
C32, C37
2
0.01uF
CAP, CERM, 0.01 µF, 6.3 V,+/- 10%, X5R, 0201
0201
GRM033R60J103KA01D
MuRata
C36
1
10uF
CAP, TA, 10 µF, 25 V, +/- 10%, 1.5 ohm, SMD
6032-28
293D106X9025C2TE3
Vishay-Sprague
C38
1
100uF
CAP, TA, 100 µF, 20 V, +/- 10%, 0.5 ohm, SMD
7343-43
293D107X9020E2TE3
Vishay-Sprague
C40
1
2.2uF
CAP, TA, 2.2 µF, 25 V, +/- 10%, 6.3 ohm, SMD
3216-18
293D225X9025A2TE3
Vishay-Sprague
H1, H2, H3, H4
4
Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead
Screw
NY PMS 440 0025 PH
B&F Fastener Supply
H5, H6, H7, H8
4
Standoff, Hex, 1"L #4-40 Nylon
Standoff
1902E
Keystone
J1, J5, J10, J11
4
Header, 100mil, 3x1, Gold, TH
PBC03SAAN
PBC03SAAN
Sullins Connector Solutions
PC Mount Phono JackRed, TH
971
Keystone
J3
J4
J6
ALTERNATE
MANUFACTURER
CAP, CERM, 0.1 µF, 25 V,+/- 5%, C0G/NP0, 1206
C29, C33, C34, C39
J2
ALTERNATE PART
NUMBER
1
RCA Jack, Red, R/A, TH
1
1
1
J7, J8, J9
3
R1, R2
2
Header, 100mil, 14x2, Gold, TH
14x2 Header
TSW-114-07-G-D
Samtec
Receptacle, 100mil, 2x1, Tin, TH
Receptacle, 2x1, 100mil,
Tin
PPTC021LFBN-RC
Sullins Connector Solutions
Header, 100mil, 2x1, Gold, TH
Sullins 100mil, 1x2, 230
mil above insulator
PBC02SAAN
Sullins Connector Solutions
Keystone_575-4
575-4
Keystone
590
Standard Banana Jack, Uninsulated, 5.5mm
RES, 590, 1%, 0.25 W, 1206
1206
RC1206FR-07590RL
Yageo America
RES, 0, 5%, 0.063 W, 0402
0402
RC0402JR-070RL
Yageo America
1206
RC1206FR-071KL
Yageo America
R3, R13, R29, R41
4
0
R5, R9, R12, R15,
R18, R20, R23,
R26, R27, R32,
R35, R40, R44, R52
14
1.00k
R6, R14, R33, R43
4
100k
RES, 100 k, 0.1%, 0.063 W, 0402
0402
RG1005P-104-B-T5
Susumu Co Ltd
R7, R28, R31, R34
4
11.8k
RES, 11.8 k, 1%, 0.25 W, 1206
1206
RC1206FR-0711K8L
Yageo America
R8
1
10.0k
RES, 10.0 k, 1%, 0.25 W, 1206
1206
RC1206FR-0710KL
Yageo America
RES, 1.00 k, 1%, 0.25 W, 1206
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Design Files
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Table 6. BOM (continued)
DESIGNATOR
QTY
VALUE
2
1.30k
1
20K
R19
1
422
R21
1
221
R22
1
R24
R10, R11
PACKAGE
REFERENCE
DESCRIPTION
MANUFACTURER
ALTERNATE PART
NUMBER
ALTERNATE
MANUFACTURER
1206
RC1206FR-071K3L
Yageo America
17x24.5mm
P160KN-0QC15B20K
TT-Electronics-BITechnologies
RES, 422, 1%, 0.25 W, 1206
1206
RC1206FR-07422RL
Yageo America
RES, 221, 1%, 0.25 W, 1206
1206
RC1206FR-07221RL
Yageo America
475
RES, 475, 1%, 0.25 W, 1206
1206
RC1206FR-07475RL
Yageo America
1
1k
TRIMMER, 1k ohm, 0.5W, TH
375x190x375mil
3386P-1-102LF
Bourns
R25
1
332
RES, 332, 1%, 0.25 W, 1206
1206
RC1206FR-07332RL
Yageo America
R36, R38
2
845
RES, 845, 1%, 0.25 W, 1206
1206
RC1206FR-07845RL
Yageo America
R37, R39
2
1.40k
RES, 1.40 k, 1%, 0.25 W, 1206
1206
RC1206FR-071K4L
Yageo America
R42
1
10k
TRIMMER, 10k ohm, 0.5W, TH
375x190x375mil
3386P-1-103LF
Bourns
R46
1
88.7k
RES, 88.7 k, 1%, 0.1 W, 0603
0603
RC0603FR-0788K7L
Yageo America
R47
1
12.0k
RES, 12.0 k, 1%, 0.1 W, 0603
0603
RC0603FR-0712KL
Yageo America
R48
1
20.0k
RES, 20.0 k, 1%, 0.1 W, 0603
0603
RC0603FR-0720KL
Yageo America
R49
1
220k
RES, 220 k, 1%, 0.1 W, 0603
0603
RC0603FR-07220KL
Yageo America
R50
1
75.0k
RES, 75.0 k, 1%, 0.1 W, 0603
0603
RC0603FR-0775KL
Yageo America
R51
1
10.0k
RES, 10.0 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402
0402
RMCF0402FT10K0
Stackpole Electronics Inc
SH-J1, SH-J2, SHJ3, SH-J4, SH-J5
5
1x2
Shunt
969102-0000-DA
3M
SNT-100-BK-G
Samtec
OPA1602AIDGK
Texas Instruments
Equivalent
Texas Instruments
R17
U1, U2, U3, U5, U6,
U7, U8
U4, U9
U10
U11
Shunt, 100mil, Gold plated, Black
Sound Plus High-Performance, Bipolar-Input Audio
Operational Amplifier, 4.5 to 36 V, -40 to 85 degC, 8-pin
SOP (DGK0008A), Green (RoHS & no Sb/Br)
DGK0008A
2
Fully Differential I/O Audio Amplifier, DGN0008D (VSSOP-8)
DGN0008D
OPA1632DGNR
Texas Instruments
OPA1632DGN
Texas Instruments
1
Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, LowDropout Linear Regulator, DRB0008A (VSON-8)
DRB0008A
TPS7A4901DRBR
Texas Instruments
TPS7A4901DRBT
Texas Instruments
1
Vin -3V to -36V, -200mA, Ultra-Low Noise, High PSRR, LowDropout Linear Regulator, DRB0008A (VSON-8)
DRB0008A
TPS7A3001DRBR
Texas Instruments
TPS7A3001DRBT
Texas Instruments
1
-5 V, Buck / Boost Charge Pump, 100 mA, 3.5 to 15 V Input,
0 to 70 degC, 16-pin SOIC (DW16), Green (RoHS & no
Sb/Br)
DW0016A
LT1054CDW
Texas Instruments
Equivalent
Texas Instruments
CAP, CERM, 180 pF, 50 V,+/- 5%, C0G/NP0, 0805
0805
C0805C181J5GACTU
Kemet
Fiducial mark. There is nothing to buy or mount.
N/A
N/A
N/A
RES, 7.50 k, 1%, 0.25 W, 1206
1206
RC1206FR-077K5L
Yageo America
Orange Miniature
Testpoint
5003
Keystone
C2, C8, C21, C27
0
FID1, FID2, FID3
0
R4, R16, R30, R45
0
20
Potentiometer 20K 20% 16MM ROTARY POT, TH
7
U12
TP1, TP2, TP3, TP4
RES, 1.30 k, 1%, 0.25 W, 1206
PART NUMBER
0
180pF
7.50k
Test Point, Miniature, Orange, TH
Analog Crossover Audio Plug-In Module
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