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the Audio DAC S / PDIF (AES3) to analog

Audio DAC S / PDIF (AES3) to analog

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Stereo Circuits
/ Audio Circuits

The described device is used to
convert the digital signal format S / PDIF (AES3) to analog. It can be used for
any device with uncompressed digital audio output (desktop CD or DVD, minidisk,
sound card PC CD-ROM). Separate transmitter can improve the signal to noise
ratio and reduce noise, which is especially true for the PC sound card. The
device does not signal processor, and therefore not able to play back compressed
or encoded multichannel signal (AC3, MP3, respectively. Mpeg)! visit page.

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The converter
has been tested only for signals with a sampling frequency of 32 kHz (minidisc),
44.1 kHz (CD) and 48 kHz (sound card PC). For lower frequencies need to be
adjusted PLL loop filter, the higher divider circuit to add two, see text.
Involvement of the transmitter to the receiver S / PDIF is the figure 1 .
Digital input signal passes through C1 at the receiver input. Differential input
receiver and the outlets RXP Rxn. The receiver is able to process signals from a
few tens of millivolts for units of volts. Disconnect the jumper, J1, we can
connect the input signal in TTL level, such as output from a CD-ROM or from the
optical receiver. In hardware mode, the circuit is switched to the outlet level
H 24th Resistors R5 and R7 is set circuit function. Logic level on pin 3, 18 and
28 are read after a reset circuit, before they switched to the output pins. The
receiver is a phase coupling (PLL), which is required for proper function of the
receiver and decoder. Output phase-Fitr hinge pin is connected to the eighth
Voltage on this pin controls the internal oscillator (VCO). The voltage on this
pin can therefore be assumed on the sampling frequency of the received signal.
Another way to determine the sampling rate (if it were necessary), to measure
frequency oscillator on pin 10 (RMCK). In developing the first version of the
converter I used in the filter PLL component values ??from the datasheet (Crip =
C3 = = 2.2 nF CFILT = C4 = 47 nF and RFILT = R2 = 3 kOhm). Phase coupling,
however, worked only for the sampling frequency (fs) 48 kHz. In order to work
for 44.1 kHz, I shrunk the resistance R2 to 560 ohms. To calculate the filter
can be found in [6]. The decoded data is taken from pin 18 guided (SDOUT) at the
input of D / A. Clock the clock signal from pin 16 (OSCLK) receivers. Logic
level signal on pin 17 (OLRCK) determines whether the data being transmitted to
the left or right channel. The frequency of this signal corresponds to the audio
sampling frequency (fs). For the operation D / A converter clock frequency is
important (RMCK) on pin 10 of the receiver. It is actually the output of
oscillator phase coupling. This frequency is governed by the D / A converter.
Its stability depends on the uniformity of the samples the output signal
(jitter). The ratio of frequency and RMCK OLRCK (FS) further specifies the
number of times the signal in the D / A converter oversampled. This ratio can be
arbitrary, circuit CS4334 accepts the Base-rate mode clock speed 256x, 384x and
512x CF. In this mode, the function of guaranteeing the sampling frequency (fs)
48 kHz. The sampling frequency of 96, respectively. 100 kHz transducer works in
the high-rate mode, which is set the clock frequency of 128x and 192x CF. The
problem is that the receiver hardware mode produces a clock speed 256x CF.
Therefore, in direct communication with the D / A converter can be an audio
sampling rate up to 48kHz. This limitation can be avoided involvement clock
frequency divider between the two mA transmitter and receiver. To reduce
interference between signals are logic transmitter and receiver separated by
resistors R8-R11. The analog signal at the output of the converter can cause the
amplitude to 3.5 V. Above this reason, the filter is only implemented at the
output RC article. I originally wanted to use a better higher order filters with
operational amplifiers, but the current operational amplifiers (useful for
audio) would require such a stress range greater than the supply voltage to 5 V.
In contrast, the amplifier `rail-to-rail, which would signal amplitude 3 , 5 V
at 5 V supply voltage made no problems, not amplifying the acoustic signal is
very appropriate. For ordinary purposes of the RC filter is completely meet. The
data sub-channel information bit U and C in serial form on wires 25 and 26 and
the receiver clock signal OLRCK. The structure described is not used. In
software mode circuit CS8415A this data can be read at once for the whole block.
Some of the channel status bits are decoded and connected to separate terminals.
The pin is a bit Copyright (indicate whether it is permitted to create a digital
copy) to pin 3 preemphasis indication on pin 13 professional display mode, the
pin 19 non-audio bit (indicates otherwise, as compressed data) and signal pin 28
indicates the original data. The pin receiver 11 is a signal indicating the sum
of various errors - the error rate, coding, or `fell` loop PLL. This signal is
indicated by LEDs. Indicates virtually no or very distorted S / PDIF signal to
the receiver is no longer able to handle. Then the output D / A converter can
discover different noises. Therefore, in this case, the device disconnects the
output from the converter and connects to the line input. Also, if it is set to
a non-audio bit output is disconnected from the transmitter. RERR signals and
non-AUDIO NOR gate are connected and routed through the connector K9 transistor
T1, which gives the relay. Jumpers can be set to K9 permanently plugged
converter, auto-switching converter and permanently disconnected. The first
location is especially important in experiments with sound and animation. The
second and third position of the jumper is advisable to replace the switch. They
can easily compare our sound from the transmitter, for example, digitally
connected to the CD player, sound from the analog output of that device. Always
connect the power supply voltage and reset the receiver. This is R4 and C5
connected to the outlet of the 9th At this point brings to use a resistor with
resistance 1 Mohm (or more) and instead of expensive electrolytic capacitors use
a cheap ceramic. Unfortunately, although the CMOS receiver circuit, flows at the
level H to the reset input current of several microamperes. Resistor R4 must be
small enough for entry level RST aroused H. In practice, it proved that they
satisfy the resistor R4 100 Ohm. The relatively tough test my receiver several
`stuck`. So I added a button to the circuit SW1, which the receiver can be
manually reset. Button, however, be omitted, the device can be reset by
disconnecting and connecting the power supply. In conclusion, the description
should mention the power supply. In order to maximize the versatility to use
just one power supply voltage. His relay powered directly and stabilizer 5 V
minimum voltage stabilizer is used about 7 V. The relay was joined together up
from 8.2 V. The minimum reserve therefore only a supply voltage of 9 V. The
maximum voltage is limited by power loss stabilizer SMD. For higher voltage is
necessary to use a standard stabilizer and relay coil for this higher voltage.
The receiver needs a 5V power supply for analog circuit (input shaping and phase
coupling) and voltage of 3-5 V (according to some parts of the catalog sheet 3
or 5 V). Voltage D / A Converter is also 5 V. Although we can supply all
districts in a uniform supply voltage of 5 V is suitable power supply for
digital part of the receiver to reduce - significantly reduces power
consumption. Power supply for digital part is therefore reduced to about 3.5
mass involved in the diodes D1 and D2. In experiments with two independent
sources showed that the supply voltage digital part is not critical - the
receiver still worked at a voltage of 1.75 V. On the other hand, the analog
power supply is critical. Although the data sheet shows both districts range
from 4.5 to 5.5 V, the device stopped working when the voltage drops below 4.62
V. To reduce the noise power D / A Converter separated reactor. Supply voltage
is applied to the soldering tip and the connector K2. He is sure D4 diode
separated, because the network adapter can be connected to the output connector
opposite polarity. The mounting plate, I witnessed the following: The board will
prepare a hole since all the connectors, so we can just plug into the board and
solder. Then the jumpers and will be filled in the order of SMD resistors,
capacitors and ICs. Finally, on the other parts will be filled by the board. Be
careful when planting IO3 - is oriented in reverse than other ICs. Solder a
piece of the choke plate to touch the foil. Shield layer of the conventional
components are connected to the ground at the connector K1 or negative power
supply voltage (0 V) supply wire soldered on both sides of the board. Do not
forget to connect the ground at point X (in addition to C5) prostr?ením piece of
wire and soldered on both sides of the board. All the necessary connectors are
on the board. Connectors J1 and K5 and K10 are breaking the pin rails. The K5
connector can connect another input signal connector S / PDIF receiver module
with an optical or digital output from CD-ROM. Optical Receiver and CD-ROMs have
outputs in TTL level, so that in this case, remove the jumper (jumper) J1. The
K6 connectors (direct output DAC), K7 (output per relay) and K8 (line) can be
connected as needed Cinch. If you do not need to have in the absence of a
digital signal through the device, just put the K8 two jumpers, so this input is
connected to the earth. Connector K4 neosazujeme. Involvement of the optical
module is input to the Figure 5 . The module used in optical receiver TORX173
(TORX176, TORX178) and voltage stabilizer. A special stabilizer is used
primarily because SMD stabilizer in the transmitter is no longer a great power
reserves and connecting the optical module should just `tighten`. If you use the
transmitter in a classical stabilizer 7805, or else the output voltage of 5 V,
there is no reason to use it for power module TORX. The output of optical
modules can be connected to a connector K5 also need to disconnect J1. Due to
the simplicity do not mention PCB. If necessary, the circuit can easily connect
the universal piece of board. Because the circuit no longer produced CS8415A can
not use a connection with him. After minor adjustments could be used later
CS8416A circuit. This adjustment, however, I tried it and even then I do not
plan to anytime soon. If you want to jump in yourself, you may be inspired
engagement DAC Elektor magazine (November 2009, page 52). I'm not sure yet
whether to engage the filter member at the outlet 8 - prefer to see data sheet.
R1 75 ohm (82 ohm) D1 to D3 1N4148 SMD R2 4.7 Ohm ( 560 Ohm ) D4 1N4001 SMD
(or normal DO41) R3, R12 and R15, R20, R21 560 ohm T1 BC849C R4 100
kOhm IO1 CS8415A-CS R5 to R7 47 kOhm IO2 CS4334-KS R8-R11 47 ohm IO3 74HC02
(SMD) R16, R17 270 kOhm IO4 78L05 (SMD) R18, R19, R22 22 kohm LED1,
LED2 LED 2mA red / red C1, C2 10 nF LED3, LED4 LED 2 mA, green / green C3 4.7 nF
( 2.2 nF ) C4 150 nF ( 82 nF ) Re1 RA12W-C (Takamisawa) or similar relay C5,
C6, C7 2.2 In ?F/16 C8, C9 6.8 nF K1 cinch to PCB C10, C17 In 1910
?F/16 K2 power outlet SCD-016 C11 to C16. 100 nF, ker K3, K4 3.5mm jack SCJ-0354
or EBS35 J1, K5 and K10 breakable connector strips L1 33 ?H, Choke axial
SW1 the P-B1720C PCB BCS 40 BCS 41 SW2 two-position switch P-B143 Optical
transmitter modules (TOTX. ..), receiver (TORX. ..) and fiber optic cables are
quite expensive. Unsuccessfully, I pokuel for single PC and connect the
amplifier `zbastlit` something cheaper. It turned out that the biggest problem
is to devise a transmitter (it is sufficient even LED and resistor) or a
receiver, but how could focus enough LED light into an optical fiber whose core
has a diameter of only a fraction of a millimeter. The recovery is easy, the
device has no setting elements and should work on first connection. The K9 mount
LED RERR and we set jumper to position the DAC. Connect the regulated power
supply and slowly we increase supply voltage from 0 to 12 volts should be
current 40-60 mA, while pressing the reset button for about 20 to 30 mA. From
the output (K3, K7) can hear the noise and various whistles. If everything is in
order, bring the digital input signal and the output should appear in the
decoded audio signal. Change any jumper from position to position the DAC car.
Relay should now be switched on only when the input digital signal. Animated
converter can build them into separate boxes, or into audio (pre) amplifiers,
which will equip the digital input. The converter is based on double circuit
boards, staffed mostly SMT technology. All connections are kept on one side of
the plate, on the other side is the area in the ground and five wire jumpers.
Most components are SMD and are mounted on the circuit. On the other hand,
boards are all connectors, relays, choke L1 and wire jumpers. LEDs, switch and
reset button can be individually connected directly to the K9 connector, like
the LEDs are connected to the PC motherboard. You can also use a board panel of
Figure 4 transmitter to link it with the flat cable 16ilovým. The panel can also
be connected permanently bent double row pin strip breaking. To convert the
digital signal, there are a number of special districts, with differing
complexity involved and the quality of the output signal. With these `easier` to
build a single chip can interface with low power consumption and signal - noise
60-80 db. For larger signal to noise ratio should be separated from their own
digital converter section. `Multi-chip` transducers achieve a distance from the
noise of 120 dB, however, largely depends on proper design and printed circuit
boards. All these districts are too fundamental flaw - in stores with electronic
components is very bad and do not be shán?jíí. For the converter described here,
I used circuits Crystal (Cirrus Logic), which can be purchased from HT EUREP (
www.hte.cz ). The core of the converter consists of two districts - receiver
decoder and an S / PDIF (or AES3) and custom converter D / A. Receiver S / PDIF
CS8415A is a very interesting district. According to the logic levels on input H
/ S can work in two entirely different modes. If you select the software mode,
you have the power (reset) circuit program first set. The receiver will have 7
inputs, which can switch software, and registers can be read by all possible
sub-channel information that is contained in the input signal. Interface circuit
for various ways to connect the control of microcontroller and multiple formats
of output data. If you select the hardware mode, you do not need a
microprocessor, but some of the features you need to resign. Almost half of the
terminals and the circuit changes the meaning of the required circuit function
is set pull-ups and pull-down resistors on three outlets. (Ie a resistor,
connected from pin to supply voltage or ground.) Subset of the features
available in hardware mode is selected very efficiently, and if we do not need
access to the registry district, or change the settings or continuous function
circuit, microprocessor control, without the bypass. Details can be found in a
comprehensive data sheet [2]. Converter is described in the hardware mode
circuit. D / A converter CS4334 uses the default mode eightfold oversampling the
input signal. Reduces noise and thus greatly simplifies the particular output
filter, which is already partially integrated. The sigma-delta converter circuit
is connected digital and analog filter. For general purposes it is enough to
output a simple circuit involving a member of the RC.
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Stereo to Mono Converter

This is a very useful circuit for those who want to transform a stereo
Power Amplifier, to mono, bridging two channels from him , reversing the phase
of the one power amplifier [R] and the polarity, with these connections we can
have 4X times the output power (double the output voltage ) . For...

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