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  • 3.14

    3.14 – Settings and Input wiring for single ended stereo output from voltage output DAC, stereo, balanced output, 2..3 VRMS full scale output voltage, 2.5V reference voltage

    Known examples of DAC’s requiring these settings are listed under 3.13.

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin.

     

  • 3.13

    3.13 – Settings and Input wiring for voltage output DAC, stereo, balanced output, 2…3 VRMS full scale output voltage, 2.5V reference voltage

    Known examples of DAC’s requiring these settings are:

     

    Analog Devices AD1852, AD1854
    Asahi Kasei (AKM) AK4324, AK4382, AK4394, AK4395, AK4396, AK4397
    Burr Brown PCM1791, PCM1793, DSD1791, DSD1792
    Crystal/Cirrus Logic CS4329, CS4350, CS4390, CS4391, CS4392, CS4396, CS4397, CS4398, CS43122
    Nippon Precision Circuits (NPC) SM5865, SM5866, SM5872 (Note SM5865/66 Datasheets misidentify the outputs as current types)
    Niigata Seimitsu FN1242A (Luxman “Fluency” DAC)
    Philips TDA1547, SAA7350
    Pioneer PD2026, PD2028, PD2029
    Sony CXD2552Q
    Wolfson Micro WM8740, WM8741

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin.

     

  • 3.11 / 3.12

    3.11 – Settings and Input wiring for voltage output DAC, stereo, single ended, 1…1.5 VRMS full scale output voltage, 0V reference voltage

    A known example of a DAC requiring these settings is the Crystal/Cirrus Logic CS4328.

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin.

     

    3.12 – Settings and Input wiring for voltage output DAC, stereo, single ended, 1…1.5 VRMS full scale output voltage, 2.5V reference voltage

     

    Known examples of DAC’s requiring these settings are

     

    Analog Devices AD1866, AD1868, AD1857 / 58 / 59, AD1958

     

    Asahi Kasei (AKM) AK4384, AK4385, AK4386, AK4387, AK4388, AK4344, AK4345, AK4364

     

    Burr Brown PCM1716, PCM1723, PCM1727, PCM1728, PCM1732, PCM1740, PCM1741, PCM1742, PCM1744, PCM1748, PCM1753 / 54 / 55, PCM1770 / 71 / 72 / 73 / 74, PCM1780 / 81 / 82, PCM2704 / 05 / 06 / 07, DSD1702

     

    Crystal/Cirrus Logic CS4327, CS4334 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 44 / 45 / 46 / 48 / 49 /

     

    Nippon Precision Circuits (NPC) SM5882, SM5883, SM5885

     

    Pioneer PE8001

     

    Philips TDA1305T, TDA1306T / 86T, TDA1311T / 12T / 13T, TDA1549, UDA1320 / 21 / 22 / 24

     

    Sanyo LC78835

     

    Panasonic MN662710 (Technics „Mash“ CD-Player on one chip IC)

     

    Wolfson Micro WM8716

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin.

     

  • 3.09 / 3.10

    3.09 – Settings and Input wiring for current output DAC, balanced Stereo DAC’s, balanced output, 4mA full scale current, 2.5V reference voltage

    A known example of a DAC requiring these settings is the Analog Devices AD1955. This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin. All Vcom connections from the Universal Tube Output Stage must be made to the “Reference Voltage (Vref)” or “Common Mode Voltage (Vcom)” Pin(s) on the DAC. An additional 51 Ohm Resistor needs to wired in each channel between “In” and “Vcom”.

     

    3.10 – Settings and Input wiring for current output DAC, balanced Stereo DAC’s, balanced output, 4mA full scale current, 0V reference voltage

     

    Known examples of DAC’s requiring these settings are Burr Brown PCM1792, PCM1794, PCM1796, PCM1798, DSD1792, DSD1794 and DSD1796. These types of DAC require the following jumper settings:

    The input connections should follow the Scheme shown underneath:

     

    All Ground connections and the Vcom connections must be made to the respective channels DAC’s Analogue Ground Pins.

     

  • 3.08

    3.08 – Settings and Input wiring for current output DAC, balanced Stereo DAC’s, balanced output, 1mA full scale current, 2.5V reference voltage

    Known examples of DAC’s requiring these settings are Burr Brown PCM1738 as well as Analog Devices AD1853. These types of DAC require the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin. All Vcom connections from the Universal Tube Output Stage must be made to the “Reference Voltage (Vref)” or “Common Mode Voltage (Vcom)” Pin(s) on the DAC.

  • 3.07

    3.07 – Settings and Input wiring for current output DAC, stereo, single ended, 1mA full scale current, ~2.5V reference voltage

    Known examples of a DAC’s requiring these settings is are Philips TDA1543A and TDA1545A (with modification as per Datasheet Note 5) and Burr Brown PCM67 & PCM69.

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections must be made to the DAC’s Analogue Ground Pin. All Vcom connections from the Universal Tube Output Stage must be made to the “Reference Voltage (Vref)” or “Common Mode Voltage (Vcom)” Pin(s) on the DAC.

  • 3.05 / 3.06

    3.05 – Settings and Input wiring for current output DAC, balanced mono DAC’s, balanced output, 1mA full scale current, 0V reference voltage

    Players and DA Convertors where four DAC’s are operated in balanced mode require these settings and wiring. The types of DAC Chips applicable are Burr Brown PCM56, PCM1702 & PCM1704 as well as Analog Devices AD1856, AD1861 & AD1862.

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections and the Vcom connections must be made to the respective channels DAC’s Analogue Ground Pins.

     

    3.06 – Settings and Input wiring for current output DAC, balanced mono DAC’s, balanced output, 2mA full scale current, 0V reference voltage

     

    Players and DA Convertors where four DAC’s are operated in balanced mode require these
    settings and wiring. The types of DAC Chips applicable are Burr Brown PCM63.

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections and the Vcom connections must be made to the respective channels DAC’s Analogue Ground Pins.

     

  • 3.01 / 3.02

    3.01 – Settings and Input wiring for current output DAC, stereo, single ended, 1mA full scale current, 0V reference voltage

    Known examples of DAC’s requiring these settings are Burr Brown PCM1700 as well as Analog Devices AD 1865.

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

     

    All Ground connections and the Vcom connections must be made to the DAC’s Analogue
    Ground Pin.

     

    3.02 – Settings and Input wiring for current output DAC, stereo, single ended, 2mA full scale current, 0V reference voltage

     

    A known example of a DAC requiring these settings is the Philips TDA1541/TDA1541A.

     

    This type of DAC requires the following jumper settings:

     

    The input connections should follow the Scheme shown underneath:

    All Ground connections and the Vcom connections must be made with individual wires to the DAC’s Analogue Ground Pin.

     

    The TDA1541(A) is listed in the Datasheet as follows:

     

    From this we derive that Pin 5 is “Analogue Ground”, Pin 6 is “Right Channel (Current) Out” and Pin 25 is “Left Channel (Current) Out”.

     

    So we need to disconnect all traces from Pin 6 and Pin 25.

     

    Then we need to connect Pin 25 to the In L connection on the Universal Tube Output Stage and Pin 6 to the In R connection.

     

    The connections from Gnd L, Gnd R, Vcom L and Vcom R on the Universal Tube Output Stage need to be made all to Pin 5 of the TDA1541, preferably using individual wires.

     

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  • 3.03 / 3.04

    3.03 – Settings and Input wiring for current output DAC, dual mono, single ended, 1mA full scale current, 0V reference voltage

    Known examples of DAC’s requiring these settings are Burr Brown PCM56, PCM58, PCM1702 & PCM1704 as well as Analog Devices AD 1851, AD1856, AD1860, AD1861 & AD1862.

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

    All Ground connections and the Vcom connections must be made to the respective channels
    DAC’s Analogue Ground Pins.

     

    3.04 – Settings and Input wiring for current output DAC, dual mono, single ended, 2mA full scale current, 0V reference voltage

     

    A known example of a DAC requiring these settings is the Burr Brown PCM63.

     

    This type of DAC requires the following jumper settings:

     

     

    The input connections should follow the Scheme shown underneath:

     

    All Ground connections and the Vcom connections must be made to the respective channels
    DAC’s Analogue Ground Pins.

     

     

  • Input Wiring and Module Configuration

    3 – Input Wiring and Module Configuration

    The Universal Tube Output Stage can be connected and configured in many different configurations to allow for virtually all DAC’s made to be connected correctly.

    In order to select the correct input wiring and jumper setting you need to determine the actual part number of the DAC Chip fitted to your CD-Player, DVD-Player or DA-Converter. If your DAC Chip is listed in the Appendix you only need to select the correct page for this DAC.

    You will still need to determine the actual Pins on the DAC Chip that carry the output signal, analogue ground and if present reference voltage. You will need to tap off these DAC Chip pins and connect them to the Universal Tube Output Stage.

    If the DAC Chip has a so-called “voltage” output you can keep the original solid state analogue stage connected and run it and the Universal Tube Output Stage in parallel.

    If the DAC Chip has a so-called “current” output you must disconnect the original solid state analogue stage from the DAC. This usually means cutting away the traces connecting to the current output pins.

    As can be seen from the above, one of the key distinguishing marks of DAC Chips for our application is the presence of Voltage or Current outputs. Usually current outputs tend to sound better as there is no additional circuitry build into the DAC Chip to convert the current from the actual DAC into Voltage. Some DAC Chips have the circuitry for current to voltage conversion on chip, but allow the user to access the current output. In this case using the current output is preferred.

    Other items of concern when selecting the correct connection and settings are if the DAC Outputs actually are referenced to Analogue Ground (0V DC on the DAC output pins) or if they are referenced to a so-called “reference voltage” (around 2.5V DC offset on the DAC output pins).

    Of final concern is if the DAC used has single ended or balanced outputs. If the DAC has only Single Ended outputs it is not possible to get a balanced output signal.

    Conversely, DAC’s that have a balanced output can generally be connected in single ended mode with little or no complications.

    In the following we will cover individual configurations for various DAC Chip Structures.

    Wherever possible a list of known DAC’s conforming to this scheme is given.

    Known means they are known to have been manufactured at some time and are documented in the public domain to have technical data and design features placing them into the group of DAC’s using this scheme. It does not imply that the particular combination of DAC and Universal Tube Output Stage has been tested with this type of DAC.