® DSD1700 DSD 170 0 For most current data sheet and other product information, visit www.burr-brown.com Direct Stream Digital™ (DSD™) Audio DIGITAL-TO-ANALOG CONVERTER TM FEATURES APPLICATIONS ● DIRECT TRANSFER OF DSD DATA STREAM TO ANALOG OUTPUT SIGNAL ● DUAL DIFFERENTIAL ANALOG FIR FILTER ● DIRECT, CMOS LOGIC INTERFACE TO DSDTM DECODER IC Data Clock: 2.8224 MHz (64 • 44.1kHz) System Clock: 11.2896 MHz (256 • 44.1kHz) ● EXCELLENT DYNAMIC PERFORMANCE THD+N: 0.001% (typ) Dynamic Range: 110dB (typ) SNR: 110dB (typ) Frequency Response (–3dB): 100kHz ● SINGLE +5V SUPPLY OPERATION ● SMALL 28-LEAD SSOP PACKAGE ● SUPER AUDIO CD (SACD™) PLAYERS ● PROFESSIONAL DSD PROCESSORS ● PROFESSIONAL DSD CONSOLES DESCRIPTION The DSD1700 is a unique digital-to-analog converter designed for DSD audio applications. The DSD1700 consists of a single-channel, 8-tap analog FIR filter constructed using a double differential circuit architecture, ensuring excellent dynamic performance and high power- supply noise rejection. The DSD1700 also includes the necessary logic required to interface directly to a DSD decoder IC. The overall features and performance of the DSD1700 make it an ideal choice for high-performance Super Audio CD players and DSD studio applications. All trademarks are property of their respective owners. VDD PHASE DATA DSD I/F Duty Generator Analog FIR (HOT/P) IOUTHP Analog FIR (HOT/N) IOUTHN Analog FIR (COLD/P) IOUTCP Analog FIR (COLD/N) IOUTCN Shift Register (HOT) VDD RST DCK SCK Timing Generator VDD DGND VCC Power Supply Duty Generator AGND Shift Register (COLD) International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 © 1999 Burr-Brown Corporation PDS-1555A Printed in U.S.A. December, 1999 SPECIFICATIONS All specifications TA = +25°C, VDD = VCC = 5.0V, fS = 44.1kHz, data clock = 64fS, system clock = 256fS, unless otherwise specified. (Although the sampling frequency of Direct Stream Digital is 2.8224MHz, for convenience, in this specification sheet, it is described that the sampling frequency (fS) is 44.1kHz and the 2.8224MHz clock is 64fS). DSD1700E PARAMETER CONDITIONS INPUT CLOCK Data Clock Frequency (DCK) System Clock Frequency (SCK) MIN 64fS 256fS SCK AC REQUIREMENT(1) Input Clock Duty Cycle DIGITAL INPUT High Level Input Voltage Low Level Input Voltage High Level Input Current Low Level Input Current MHz MHz 50 % 0.3VDD ±10 ±10 –120 with 30kHz GIC Filter with 30kHz GIC Filter with 30kHz GIC Filter POWER SUPPLY REQUIREMENTS Voltage Range Supply Current ICC+IDD Power Dissipation 4.5 5 5.5 27.5 –25 –55 θJA ±10 ±1 0.001 110 110 100 VCC, VDD VCC = VDD = 5.0V VCC = VDD = 5.0V 28-Pin SSOP UNITS 2.8224 11.2896 4.1VCC ±4 ±0.1 2 DYNAMIC PERFORMANCE(5) THD+N, VOUT = 0dB Dynamic Range Signal-to-Noise Ratio Frequency Response, –3dB MAX 0.7VDD VIH VIL IIH IIL(2) IIL(3) ANALOG OUTPUT(5) Full-Scale Voltage Gain Error Offset Error Output Impedance(4) TEMPERATURE RANGE Operating Storage Thermal Resistance TYP 100 V V µA µA µA Vp-p % of FSR % of FSR kΩ % dB dB kHz 5.5 8.0 40 VDC mA mW +85 +125 °C °C °C/W NOTES: (1) See description of system clock in the Functional Description section of this data sheet. (2) Pins 26, 27, 28: DATA. DCK. SCK. (3) Pins 3, 4: RST, PHASE (with internal pull-up). (4) Pins 13, 14, 15, 16: IOUTHN, IOUTCP, IOUTCN, IOUTHP. (5) Measure DSD signal modulated fSIG = 1kHz with 50% scaling factor through standard differential to single-ended converter (see Figure 10) using Audio Precision System II in rms mode with 20kHz LPF and 400Hz HPF. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® DSD1700 2 PIN CONFIGURATION PIN ASSIGNMENTS Top View SSOP DGND 1 28 SCK VDD 2 27 DCK RST 3 26 DATA PHASE 4 25 AGND AGND 5 24 VCC VCC 6 23 AGND AGND 7 22 VCC VCC 8 21 VCC VCC 9 20 AGND 10 PIN NAME I/O DESCRIPTION 1 DGND — Digital Ground 2 VDD — Digital Power Supply: +5V 3 RST IN Reset Control Input, Active LOW(1) 4 PHASE IN Select data phase (LOW = Normal; HIGH = Invert) 5 AGND — Analog Ground 6 VCC — Analog Power Supply: +5V 7 AGND — Analog Ground 8 VCC — Analog Power Supply: +5V Analog Power Supply: +5V 9 VCC — 10 AGND — Analog Ground 11 VCC — Analog Power Supply: +5V Analog Ground 12 AGND — 13 IOUTHN OUT 14 IOUTCP OUT Analog Output from DAC (Cold Positive) 15 IOUTCN OUT Analog Output from DAC (Cold Negative) AGND 16 IOUTHP OUT 19 VCC 17 AGND — 18 AGND — Analog Ground VCC 11 18 AGND 19 VCC — Analog Power Supply: +5V AGND 12 17 AGND 20 AGND — Analog Ground 21 VCC — Analog Power Supply: +5V Analog Power Supply: +5V DSD1700 Analog Output from DAC (Hot Negative) Analog Output from DAC (Hot Positive) Analog Ground IOUTHN 13 16 IOUTHP 22 VCC — IOUTCP 14 15 IOUTCN 23 AGND — Analog Ground 24 VCC — Analog Power Supply: +5V 25 AGND — Analog Ground 26 DATA IN Direct Stream Digital Data Input 27 DCK IN Data Clock Input 28 SCK IN System Clock Input NOTE: (1) With internal pull-up resistor ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Voltage(2) Supply .............................................................................. +6.5V Supply Voltage Differences(3) ........................................................... ±0.1V Ground Voltage Differences(4) .......................................................... ±0.1V Digital Input Voltage ................................................... –0.3V to VDD +0.3V Input Current (any pins except supplies) ....................................... ±10mA Operating Temperature .................................................... –25°C to +85°C Storage Temperature ..................................................... –55°C to +125°C Junction Temperature .................................................................... +150°C Lead Temperature (soldering, 5s) ................................................. +260°C Package Temperature (IR reflow, peak, 10s) ............................... +235°C This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. (2) VCC, VDD. (3) Among VCC, VDD . (4) Among AGND, DGND. PACKAGE/ORDERING INFORMATION PRODUCT PACKAGE PACKAGE DRAWING NUMBER DSD1700E 28-Lead SSOP 324 0°C to +70°C DSD1700E " " " " " SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(1) TRANSPORT MEDIA DSD1700E DSD1700E/2K Rails Tape and Reel NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K indicates 2000 devices per reel). Ordering 2000 pieces of “DSD1700E/2K” will get a single 2000-piece Tape and Reel. ® 3 DSD1700 GENERAL INFORMATION DECODER INTERFACE The decoder interface consists of several CMOS logic inputs. The system clock input, SCK (pin 28), operates at 11.2896MHz (256 • 44.1kHz). The data bit clock, DCK (pin 27), operates at 2.8244 MHz (64 • 44.1kHz) and is the 64x oversampled data clock. The 1-bit, 64x oversampled data stream is input at DATA (pin 26). DATA and DCK are synchronized to the SCK falling edge. The DSD1700 generates HOT and COLD data internally for use with the double differential analog FIR filter. The PHASE input (pin 4) is used to determine the polarity of the HOT and COLD data (normal or inverted). The PHASE input is synchronized to the rising edge of SCK. The DSD1700 is designed solely for use in DSD and SACD applications. It is not compatible with standard CD audio transports, or DVD/MPEG-2 decoders. Burr-Brown manufacturers a wide array of products for these applications. Please refer to our audio brochure and product data sheets, available from our web site (www.burr-brown.com) and local sales offices. FUNCTIONAL DESCRIPTION The concept of Direct Stream Digital (DSD) conversion is simple. An analog audio input is digitized by a 1-bit, 64x oversampled delta-sigma modulator. The 1-bit data stream is then stored and may be transferred to a SACD disc at a later time. For playback, the 1-bit, 64x oversampled data is then presented to the DSD1700 directly by a DSD decoder IC. The DSD1700 then low-pass filters the oversampled data to reconstruct the original analog audio waveform. The recording and playback functions are illustrated in Figures 1 and 2 respectively. To perform the digital-to-analog conversion, the DSD1700 includes both the decoder interface logic and an analog FIR filter. The following paragraphs provide a summary of these functions. Analog Input Loop Filter (Noise Shaping and Integration) 1-Bit Quantizer ∫ Q + – The RST input (pin 3) is used for system reset purposes. RST should be High for normal operation, and Low for reset operation. When RST is held Low, the current outputs of the analog FIR filter are set to the bipolar zero (BPZ) level. The RST signal is synchronized to the rising edge of SCK. TIMING Figures 3 though 6 show the timing diagrams for the DSD1700 interface signals. Figure 3 shows the system clock (SCK) timing requirements. Figure 4 shows the general timing for the data input. Figures 5 and 6 show the detailed timing for the DSD data and control data inputs. Interface Logic DSD Input (64fS, 1-Bit) DSD Output (64fS, 1-Bit) Low-Pass Filter Analog Output LOGIC FIGURE 2. DSD Playback. FIGURE 1. DSD Recording. tSCKH VIH High VIH = 0.7VDD VIL = 0.3VDD System Clock VIL Low tSCKL SYMBOL tSCKH tSCKL 1/256 fS DESCRIPTION MIN System Clock Pulse Width High System Clock Pulse Width Low 10 10 FIGURE 3. System Clock Timing. RST SCK (256fS) DATA DCK (64fS) FIGURE 4. Input Signal Timing. ® DSD1700 4 TYP MAX UNITS ns ns SCK tSCWL tSCWH tSCY DCK tDCH tDCS tDAH tDAS DATA SYMBOL tSCWH tSCWL tSCY tDCS tDCH tDAS tDAH DESCRIPTION MIN SCK Pulse Width High SCK Pulse Width Low SCK Pulse Cycle Time DCK Setup Time DCK Hold Time DATA Setup Time DATA Hold Time 10 10 TYP MAX UNITS ns ns sec ns ns ns ns 1/(256fS) 15 5 15 5 FIGURE 5. DSD Data Input Timing. SCK tSCWH tSCWL tSCY PHASE tPH tPS tRH tRS RST SYMBOL tSCWH tSCWL tSCY tPS tPH tRS tRH DESCRIPTION MIN SCK Pulse Width High SCK Pulse Width Low SCK Pulse Cycle Time PHASE Setup Time PHASE Hold Time RST Setup Time RST Hold Time 10 10 TYP 1/(256fS) 15 5 15 5 MAX UNITS ns ns sec ns ns ns ns FIGURE 6. Control Data Input Timing. ® 5 DSD1700 ANALOG FIR FILTER Figure 7. Prior to the analog FIR filters, the duty cycle of the DSD input signal is set to 75% by the DSD1700’s duty generators. The low-pass filter function for the DSD1700 is constructed by using four 8-tap, analog FIR filters with current outputs. The four filters include one each for HOT and COLD positive, and one each for HOT and COLD negative. This is referred to as a double differential architecture. These filters use resistors to set the filter coefficients, as shown in D0 D1 R0 D2 R1 D3 R2 Plots of the analog FIR filter response is shown in Figure 8. The stop-band attenuation of the filters dictates that additional low-pass filtering is required at the output of the external current-to-voltage converter circuit (see Figure 10). D4 R3 D5 R4 D6 R5 D7 R6 R7 IOUT FIGURE 7. Analog FIR Filter Structure. FREQUENCY RESPONSE (DC – 11.2896MHz) FREQUENCY RESPONSE (DC – 1.4112MHz) 0 Gain (dB) Gain (dB) 0 –50 –50 –100 –100 0 705,600 Frequency (Hz) 0 1,411,200 FIGURE 8. Analog FIR Filter Frequency Response. ® DSD1700 6 5,644,800 Frequency (Hz) 11,289,600 APPLICATIONS INFORMATION CURRENT-TO-VOLTAGE (I/V) CONVERTER CIRCUIT TYPICAL CONNECTIONS The DSD1700 is a current output device, and requires an I/V conversion circuit to transform the double-differential outputs into a usable voltage output. The circuit in Figure 10 is recommended for this purpose. Op amps are OPA134 or equivalent. Figure 9 shows the basic connection diagram for the DSD1700. A significant number of power supply bypass capacitors are required, and Burr-Brown recommends the indicated values for optimal performance. +5V DSD1700 1 DGND SCK 28 2 VDD DCK 27 System Reset 3 RST DATA 26 Phase Control 4 PHASE AGND 25 5 AGND 6 VCC 7 AGND VCC 22 8 VCC VCC 21 9 VCC AGND 20 System Clock C1 Direct Stream Digital™ Data C6 VCC 24 C1 AGND 23 C7 C3 C4 10 AGND C5 C8 VCC 19 11 VCC AGND 18 12 AGND AGND 17 13 IOUTHN IOUTHP 16 14 IOUTCP IOUTCN 15 C9 = Analog Ground NOTE: C1 = 0.1µF ceramic and 1-100µF. C2 - C9 = 0.1µF ceramic each and 1-100µF chemical. FIGURE 9. Basic Connection Diagram. +18V 0.1µF 1kΩ 100pF 1kΩ 8.2 kΩ +18V 0.1µF IOUTCN 220pF IOUTHP 2 3 +5V 470pF 4.7kΩ 4.7kΩ 1 3 +18V OPA134 4 2 3 6 OPA134 4 Analog Out 6 1 0.1µF 7 4.7kΩ 1 8.2 kΩ –18V 220pF IOUTCP 1kΩ 7 2 –18V 4.7kΩ 1kΩ 6 OPA134 4 4.7kΩ 470pF 7 4.7kΩ 100pF IOUTHN 0.1µF = Analog Ground –18V FIGURE 10. Recommended I/V Conversion Circuit. ® 7 DSD1700 PRINTED CIRCUIT BOARD LAYOUT Separate power supplies are recommended for the digital and analog sections of the board. This prevents the switching noise present on the digital supply from contaminating the analog power supply and degrading the dynamic performance of the DSD1700. A typical PCB floor plan for the DSD1700 is shown in Figure 11. A ground plane is recommended, with the analog and digital sections being isolated from one another using a split in the plane. The DSD1700 should be oriented with the digital I/O pins facing the ground plane split/cut, allowing for direct connection to the DSD decoder and control signals originating from the digital section of the board. Digital Power +VD Analog Power DGND AGND +5VA +VS –VS VCC VDD DSD™ Decoder and Control Logic DGND DSD1700 Output Circuits Digital Ground AGND DIGITAL SECTION ANALOG SECTION Return Path for Digital Signals FIGURE 11. Recommended PCB Layout Technique. ® DSD1700 8 Analog Ground