Cambridge-Dacmagic-dac-sm维修电路图 手册.pdf

Audio Partnership, Gallery Court, Hankey Place, London, SE1 4BB, UK Tel: +44 (0)20 7940 2200 Fax: +44 0 20 7940 2233 DACMAGIC. Issue Date: November 2008 SERVICE MANUAL AP25144/1 Specifications: D/A converters Dual Wolfson WM8740 24bit DACs Digital filter Texas Instruments TMS 320VC5501 DSP upsampling to 24bit 192kHz Frequency response 20Hz to 20kHz (0.1dB)* THD 1kHz 0dBFs <0.001% 24bit THD 1kHz -10dBFs <0.001% THD 20kHz 0dBFs <0.002% S/N ratio -112dBr Total correlated jitter <130pS Crosstalk 1kHz < -100dB Crosstalk 20kHz < -90dB Output impedance <50ohms Output level (unbalanced) 2.1V rms Output level (balanced) 4.2V rms (2.1V per phase) Digital input word widths supported 16-24bit* Digital input sampling frequencies supported 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz Audio output upsampling Fixed 24bit 192kHz Dimensions (H x W x D) 52 x 215 x 191mm (2.0 x 8.6 x 7.6”) Weight 1.2kg/2.6lbs * Steep filter disabled *16bit for USB 1 RadioFans.CN CAMBRIDGE AUDIO AZUR DACMAGIC SERVICE MANUAL TABLE OF CONTENTS Specifications 1 TableofContents 2 FrontPanelDetails 3 RearPanelConnections 4 SafetyInstructions 56 ExplodedDiagram 7 BillofMaterials 810 MainPCBSPDIFI/O,ABUS,RS232 11 MainPCBDSP,DIR,DIT12 MainPCBDAC13 MainPCBDAC(PowerSupply) 14 FrontPanel(Control)LEDandMute15 2 RadioFans.CN Rear panel connections 1. Unbalanced Audio Outputs Single-ended conventional stereo outputs for connection to the line-level phono/RCA inputs of an amplifier. 2. Balanced Audio Outputs The DacMagic also features true balanced (XLR) outputs. This is a higher quality output that can reject noise and interference with equipment with balanced inputs. These balanced outputs are ideally suited for connection to the Cambridge Audio 840A or 840E amplifiers. XLR connectors should be wired as follows: Pin 1 Ground; Pin 2 Hot (in-phase); Pin 3 Cold (phase-inverted). 3. Digital Outputs The digital outputs allow a digital recording device to be connected. These outputs loop or pass-through unprocessed digital audio from the selected digital input. Two types are available (both the co-axial and the optical are active concurrently and can be used to connect and run equipment at the same time): S/P DIF co-axial to obtain best results, use a high quality 75 ohm digital RCA interconnect cable (not one designed for normal audio use). TOSLINK optical use a high quality TOSLINK fibre-optic interconnect cable designed specifically for audio use. Note: These outputs are pass-through only; there is no upsampling or any other modification done to the LPCM input signal. 4. 1A 125 TRANSISTORS 13045V 300mANPN Signal2Q1, Q2BC337-25TO921300-337000-100PY214 131NPN Darlington1Q4MPSA141300-140000-100PY1211 132nylon bush4BS1-BS44082-000220E000 1333 WayTO220 Heatsink2HS1, HS2AP19208/2 134M3x8mm STPP/H Black Screw4SC1-SC4 135M3x5mm MCP/H Black Screw4SC5-SC8 136TO220Silicon Pad4SI1-SI4Fix Regulators to Heatsink 137DIL08 SOCKET1SOCKET 1For U6 138LED spacer6.5mm led spacer12SP1-SP12LED-6.56.5mm black 139bracket PS-11E01 switch bracket 1SP13AP228271 140M3Black Washer2WS1, WS2Fibre MISCELLANEOUS SWITCHES Note: resistors, capacitors and other generic components are not usually stocked by the manufacturer. 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