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FETAudio FDA-2A Manual

Fetaudio ad1955+wm8805 single ended dac
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FDA-2A Manual.doc
AD1955 + WM8805 Single Ended DAC
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Designed By Spencer Cheung of FETAudio.com
Email:
spencer@fetaudio.com
Page 1
www.FETAudio.com
FDA-2A Manual
High Fidelity 24 bit*192kS/s
Digital to Analogue Converter
or
skcheung68@hotmail.com
Rev. 1.0
31-Aug-2012

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Summary of Contents for FETAudio FDA-2A

  • Page 1 FDA-2A Manual.doc Rev. 1.0 www.FETAudio.com FDA-2A Manual AD1955 + WM8805 Single Ended DAC ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ High Fidelity 24 bit*192kS/s Digital to Analogue Converter ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Designed By Spencer Cheung of FETAudio.com Email: spencer@fetaudio.com skcheung68@hotmail.com Page 1 31-Aug-2012...
  • Page 2 FDA-2A AD1955 DAC suit more on solid states amplifiers. In FDA-2A, the AD1955 DAC chip will work in its reset default mode, i.e. PCM mode. Thus FDA-2A natively is able to work up to 24bit/96k with “NOS Daughter Board” due to the limitation of AD1955 default PCM mode.

  • Page 3: Specifications

    FDA-2A Manual.doc Rev. 1.0 B. Specifications: 1. DAC chip AD1955 and receiver chip WM8805 plus the discrete super sound IV converter in pure class “A” operation. 2. On board full power supplier regulations for the DAC to work in standalone hardware mode with 4 digital inputs (2 SPDIF –...

  • Page 4: Assembly Instruction

    FDA-2A Manual.doc Rev. 1.0 C. Assembly Instruction Please take necessary ESD precautions, as all the parts are ESD sensitive! 2. Solder all SMD IC: AD1955, WM8805, 74 Series ICs, and AMS1117, Align the markings of the parts with the text on the PCB screen-printing.
  • Page 5 FDA-2A Manual.doc Rev. 1.0 7. Solder the rest of the parts starting from the smallest parts first, preferably also by component type and by component value. For example, beads (except L8 and L15), Pin Headers, pulse transformer, relays, resistors, LEDs, diodes, small E-caps and TO-92 transistors, VRs, Connectors, fuses etc…...
  • Page 6 FDA-2A Manual.doc Rev. 1.0 10.3. Do not connect the 3 wires at J19 and J21. Refer to the tuning procedure for details. 10.4. Install all transistors into heat-sink with their markings all facing upward as shown below. Note that there is a mica insulation sheet between the metal body of TO-220 parts (IRF610, IRF9610 and LM317T) and the heat sink.
  • Page 7 FDA-2A Manual.doc Rev. 1.0 10.5. If ASRC daughter board module is used, the output sample frequency Fs can be set as below: ASRC Chip Sample Frequency SRC4192 Open Open 96k (recommended) SRC4192 Open Short SRC4192 Short Open 192k (No Output)
  • Page 8 FDA-2A Manual.doc Rev. 1.0 D. Tuning and Testing Procedures: 1. With all the parts in place except the 3 wires, L8 and L15, insert the NOS daughter board in place (U18). 2. Connect AC 9V (or a regulated power supply with current limit set to 200mA at 12Vdc)
  • Page 9 FDA-2A Manual.doc Rev. 1.0 19. Connect a 1kHz digital signal to the SPDIF1 input (lower RCA socket). A test CD recorded with 1kHz can be used with a CD player with SPDIF output. 20. Check the output levels for 0dBFS input signal is about 1.55Vrms at J14 T1 and T2 relative to G.
  • Page 10 FDA-2A Manual.doc Rev. 1.0 E. Board Interface Specifications: 1. Power Supply Connectors: Location Description Format 18V to 20V AC, 0.8A, 14VA 3.96mm pitch (5mm also provided) 18V to 20V AC, 0.8A, 14VA 3.96mm pitch (5mm also provided) 8 to 9V AC, 1.2A, 12VA 3.96mm pitch (5mm also provided)
  • Page 11 FDA-2A Manual.doc Rev. 1.0 DGND USB LED drive from pin 1 of J24 (no current limit) AND pin 5 of J5 (with resistor R121=680R current limit). +3V3 Supply from U8 Lock LED drive (with resistor 680R current limit) Lock = Un-mute...
  • Page 12 FDA-2A Manual.doc Rev. 1.0 9. J12 – AD1955 Control Bus (SPI): Description Marking on PCB DGND CCLK Cclk CLATCH-BAR Latch CDATA Cdata ZEROL ZeroL ZEROR ZeroR Refer to AD1955 data sheet for details 10. J13 – AD1955 Digital Bus (I2S):...
  • Page 13 FDA-2A Manual.doc Rev. 1.0 12. JUMPERS, RESISTOR AND PIN HEADER DESCRIPTION: Location Description R53/R88 Short one of these resistors; R88 = I2S Mute at J5 pin 9 is active High; R53 = I2S Mute is active LOW. Default is R88 short (active high).
  • Page 14 FDA-2A Manual.doc Rev. 1.0 groups of pads are provided. Example: H09 & H10 are the same points, and H11 & H12 are the same points. Thus connect a film capacitor from H09 to H11 and/or H10 to H12. Other connections are {H013 to H015, H014 to H016}.
  • Page 15 The front panel control board Version 7.1 will control the counting of two digits, that is choice of 4 inputs. In FDA-2A, it can be set to use either 4 digital input (2 x SPDIF, AES & Optical) or 3 digital input (SPDIF, AES, & Optical) and one I2S input (J5). Note that the front panel control will remember the last selection after power off as there is a static memory chips FM1106 on board.
  • Page 16 C237 2 SG 3 CHS R203 RCA_JF2 R208 R216 J19-1 R231 +20VALL C208 C229 COMPANY: www.FETAudio.com TITLE: FDA-2A (AD1955 + WM8805) DRAWN: DATED: Spencer Cheung 2012-08-15 CHECKED: DATED: CODE: SIZE: DRAWING NO: REV: <Checked By> <Checked Date> QUALITY CONTROL: DATED:...
  • Page 17 R184 C135 OUT_RIGHT C238 R188 R180 R204 R218 R210 R232 +20VALL C211 C230 COMPANY: www.FETAudio.com TITLE: FDA-2A (AD1955 + WM8805) DRAWN: DATED: Spencer Cheung 2012-08-15 CHECKED: DATED: CODE: SIZE: DRAWING NO: REV: <Checked By> <Checked Date> QUALITY CONTROL: DATED: 1955V3 FDA-2A-5 <QC By>...
  • Page 18 I2S Select RESET SDATA U12-A R171 BCLK E_MCLK COMPANY: www.FETAudio.com E_SDA Ext. I2S E_BCLK LRCLK E_LRCK TITLE: DGND I2S2 FDA-2A (AD1955 + WM8805) U13-D I2S1 DRAWN: DATED: R120 Spencer Cheung 2012-08-15 USB2 U12-B CHECKED: DATED: R121 CODE: SIZE: DRAWING NO: REV: <Checked By>...
  • Page 19 5 ISCLK BCLK SCLKO 6 ISDATA SDATA SDATAO 7 IMCK MCLK R153 MCKO BCLKO TITLE: DGND FDA-2A (AD1955 + WM8805) R152 SDATAO DRAWN: DATED: Spencer Cheung 2012-08-15 NOS or ASRC MODULE R151 MCKO CHECKED: DATED: CODE: SIZE: DRAWING NO: REV: <Checked By>...
  • Page 20 J26-1 J29-2 J26-2 RX4/GPO3 J29-3 J26-3 COMPANY: www.FETAudio.com SDOUT J29-4 J26-4 RX5/GPO4 J29-5 J26-5 SDIN TITLE: J29-6 J26-6 FDA-2A (AD1955 + WM8805) RX6/GPO5 J29-7 J26-7 DRAWN: DATED: GPO0/SWIFM J29-8 J26-8 Spencer Cheung 2012-08-15 RX7/GPO6 J29-9 J26-9 CHECKED: DATED: SCLK CODE:...
  • Page 21 R143 -VAR 3296W-1-502LF R141 R145 R166 AGND M3 Screw Holes x 16 COMPANY: www.FETAudio.com smt pts TITLE: AGND 1 U5 FDA-2A (AD1955 + WM8805) FIDUCIAL_15_30 DRAWN: DATED: Spencer Cheung 2012-08-15 1 U19 FIDUCIAL_15_30 DGND CHECKED: DATED: CODE: SIZE: DRAWING NO: REV: <Checked By>...

  • Page 22: Spdif Out

    J1-6 +3.3VD J50-2 www.FETAudio.com J1-7 Logic power decouple XO-input (12M) LOCKO J1-8 TITLE: C184 C182 C183 C181 J1-9 FDA-2A (AD1955 + WM8805) MUTE_B J1-10 DRAWN: DATED: Spencer Cheung 2012-08-15 CHECKED: DATED: CODE: SIZE: DRAWING NO: REV: DGND <Checked By> <Checked Date>...
  • Page 23 C168 C257 +12VDC +5VREG DGND 1955 5V Regulator PWROFFCTL COMPANY: www.FETAudio.com +12VD Power down control TITLE: Toslink 5V supply C260 FDA-2A (AD1955 + WM8805) C220 DRAWN: DATED: +5VREG Spencer Cheung 2012-08-15 +5VDAC C261 CHECKED: DATED: C250 CODE: SIZE: DRAWING NO:...
  • Page 24 1955V3_1BOM/BOM for Manual Page 1 of 3 Item Reference Value Manufacturer Q1-2 Q7-8 Q13-16 KSA1220AYS Fairchild Q17-18 Q31-34 KSC1815 Fairchild Q3-6 Q9-12 KSC2690AYS Fairchild 51698-LF3 MIDCOM T2-3 MIDCOM 74HC00D Fairchild, NXP or TI 74HC02D Fairchild, NXP or TI 74VHC125M Fairchild, NXP or TI 74HC138D Fairchild, NXP or TI 74VHC244M...
  • Page 25 J22 J61 3x1 male HD China Source J19 J21 150mm Con Wire China Source J12-13 J20 6x1 male HD China Source NOS Module board FETAUDIO 7x1 round socket for NOS Board China Source D34-37 1N4007 Semtech M7 1N4148 Semtech 1N4148 Semtech...
  • Page 26 1955V3_1BOM/BOM for Manual Page 3 of 3 Item Reference Value Manufacturer R65 R67 R75 R79-80 R84 R90 R109-113 R117 R119 R136-137 Xicon 271- R59 R83 Xicon 271- R72 R87 R116 R138-139 Xicon 271- R64 R76 R142-143 R120-121 680R Xicon 271- R78 R148 Xicon 271- R49-51 R56 R77...
  • Page 27 47k 1% Walsin or ASJ R2-5 R8 R15 680R 1% Walsin or ASJ FP V7.1 pcb FP V7.1 pcb FETAUDIO Flat cable 10 wires w/plug 12 inches 10-wire flat cable Length = 12 inches 5x2 2.54mm plug 5x2 header plug China...
  • Page 28 FET Audio 09/13/12 17:29:23 All measurement use 44.1k Fs, 0dB = 1.55Vrms with 100k load 0dBFS at 1kHz -100 -110 -120 -130 -140 -150 -160 -170 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left 44.1k 0dbFS Magenta Solid Fft.Ch.2 Ampl...
  • Page 29 FET Audio 09/13/12 17:34:09 -10dBFS -100 -110 -120 -130 -140 -150 -160 -170 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left -10dbFS Magenta Solid Fft.Ch.2 Ampl Left D-A FFT DAC 1955 SE -10dbfs.at27...
  • Page 30 FET Audio 09/13/12 17:35:20 -60dBFS; very clean noise floor! -100 -110 -120 -130 -140 -150 -160 -170 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left -60dbFS Magenta Solid Fft.Ch.2 Ampl Left D-A FFT DAC 1955 SE -60dbfs.at27...
  • Page 31 FET Audio 09/13/12 17:48:10 -60dBFS with 100k Bandwidth; very clean noise floor! -100 -110 -120 -130 -140 -150 -160 -170 100k Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left -60dbFS 100k BW Magenta Solid Fft.Ch.2 Ampl Left D-A FFT DAC 1955 BW 100k -60db.at27...

  • Page 32: Frequency Response

    FET Audio 09/13/12 17:42:27 +4.5 Frequency response and distortion vs frequency +3.5 0.05 +2.5 0.02 +1.5 +0.5 0.01 -0.5 -1.5 0.005 Frequency Response -2.5 Distortion vs -3.5 0.002 Frequency -4.5 0.001 Sweep Trace Color Line Style Thick Data Axis Comment Solid Anlr.Level A Left...
  • Page 33 FET Audio 09/13/12 17:41:29 Input and output levels Distortion vs Input levels 0.05 0.02 0.01 0.005 0.002 -100 0.001 -120 -110 -100 dBFS Sweep Trace Color Line Style Thick Data Axis Comment Solid Anlr.Level A Left Magenta Solid Anlr.THD+N Ratio Right Yellow Solid...
  • Page 34 FET Audio 09/13/12 17:43:44 IMD 19k and 20k -100 -110 -120 -130 -140 -150 -160 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left IMD 19k and 20k Magenta Solid Fft.Ch.2 Ampl Left D-A FFT DAC 1955 IMD 19_20k.at27...
  • Page 35 FET Audio 09/13/12 17:46:15 Jitter rejection 10mUI 1kHz at 18k signal Cannot see any signal, excellent rejection!!! -100 -110 -120 -130 -140 -150 -160 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left 10mUI Magenta Solid Fft.Ch.2 Ampl Left D-A FFT DAC 1955 Jitter 10mUI.at27...
  • Page 36 FET Audio 09/13/12 17:47:15 Jitter 100mUI 1k at 2nd harmonic 10k signal distortion of 10k signal Cannot see any jitter signal, excellent rejection -100 -110 -120 -130 -140 -150 -160 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left 100mUI...
  • Page 37 Input at SPDIF1, measured at J13 bus near to AD1955 input Master Clock: 37.2ps Fs: 174.6pS Bit Clock: 210pS...