AD1865N-K

a Complete Dual 18-Bit 16 ⴛ FS Audio DAC AD1865* FUNCTIONAL BLOCK DIAGRAM (DIP Package) FEATURES Dual Serial Input, Voltage Output DACs No External Components Required 110 dB SNR 0.003% THD+N Operates at 16 ⴛ Oversampling per Channel ⴞ5 Volt Operation Cophased Outputs 116 dB Channel Separation Pin Compatible with AD1864 DIP or SOIC Packaging APPLICATIONS Multichannel Audio Applications Compact Disc Players Multivoice Keyboard Instruments DAT Players and Recorders Digital Mixing Consoles Multimedia Workstations –V S 1 TRIM 2 23 TRIM REFERENCE MSB 24 +V S AD1865 REFERENCE 3 22 MSB IOUT IOUT 4 21 AGND 5 20 AGND 19 SJ SJ 6 RF 7 18 RF VOUT 8 17 VOUT +VL 9 16 NC DR 10 15 DL LR 11 14 LL 13 DGND CLK 18-BIT LATCH 18-BIT D/A 18-BIT D/A 12 18-BIT LATCH NC = NO CONNECT PRODUCT DESCRIPTION The AD1865 is a complete, dual 18-bit DAC offering excellent THD+N and SNR while requiring no external components. Two complete signal channels are included. This results in cophased voltage or current output signals and eliminates the need for output demultiplexing circuitry. The monolithic AD1865 chip includes CMOS logic elements, bipolar and MOS linear elements and laser-trimmed thin-film resistor elements, all fabricated on Analog Devices’ ABCMOS process. The DACs on the AD1865 chip employ a partially segmented architecture. The first four MSBs of each DAC are segmented into 15 elements. The 14 LSBs are produced using standard R-2R techniques. Segment and R-2R resistors are laser trimmed to provide extremely low total harmonic distortion. This architecture minimizes errors at major code transitions resulting in low output glitch and eliminating the need for an external deglitcher. When used in the current output mode, the AD1865 provides two ± 1 mA output signals. Each channel is equipped with a high performance output amplifier. These amplifiers achieve fast settling and high slew rate, producing ± 3 V signals at load currents up to 8 mA. Each output amplifier is short-circuit protected and can withstand indefinite short circuits to ground. The AD1865 was designed to balance two sets of opposing requirements, channel separation and DAC matching. High channel separation is the result of careful layout. At the same time, both channels of the AD1865 have been designed to ensure matched gain and linearity as well as tracking over time and temperature. This assures optimum performance when used in stereo and multi-DAC per channel applications. A versatile digital interface allows the AD1865 to be directly connected to standard digital filter chips. This interface employs five signals: Data Left (DL), Data Right (DR), Latch Left (LL), Latch Right (LR) and Clock (CLK). DL and DR are the serial input pins for the left and right DAC input registers. Input data bits are clocked into the input register on the rising edge of CLK. A low-going latch edge updates the respective DAC output. For systems using only a single latch signal, LL and LR may be connected together. For systems using only one DATA signal, DR and DL may be connected together. The AD1865 operates with ± 5 V power supplies. The digital supply, VL, can be separated from the analog supplies, VS and –VS, for reduced digital feedthrough. Separate analog and digital ground pins are also provided. The AD1865 typically dissipates only 225 mW, with a maximum power dissipation of 260 mW. The AD1865 is packaged in both a 24-pin plastic DIP and a 28-pin SOIC package. Operation is guaranteed over the temperature range of –25°C to +70°C and over the voltage supply range of ± 4.75 V to ± 5.25 V. PRODUCT HIGHLIGHTS REV. 0 11. 12. 13. 14. 15. 16. 17. 18. 19. 10. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 *Protected by U.S. Patents Nos.: RE 30,586; 3,961,326; 4,141,004; 4,349,811; 4,855,618; 4,857,862. The AD1865 is a complete dual 18-bit audio DAC. 110 dB signal-to-noise ratio for low noise operation. THD+N is typically 0.003%. Interchannel gain and midscale matching. Output voltages and currents are cophased. Low glitch for improved sound quality. Both channels are 100% tested at 16 × FS. Low Power—only 225 mW typ, 260 mW max. Five-wire interface for individual DAC control. 24-pin DIP or 28-pin SOIC packages available. = +25ⴗC, +V = +V = +5 V and –V = –5 V, F = 705.6 kHz, no MSB adjustment AD1865–SPECIFICATIONS or(T deglitcher) A L Parameter S S Min RESOLUTION S Typ Max 18 DIGITAL INPUTS VIH VIL IIH, VIH = +VL IIL, VIL = 0.4 V Clock Input Frequency 2.0 Bits +VL 0.8 1.0 –10 V V µA µA MHz 1.0 0.8 % of FSR % of FSR mV mV dB 13.5 ACCURACY Gain Error Interchannel Gain Matching Midscale Error Interchannel Midscale Matching Gain Linearity (0 dB to –90 dB) 0.2 0.3 4 5 74.1ns >30ns >30ns CLK >40ns >40ns >15ns >40ns LL/LR >15ns >15ns DL/DR >30ns MSB 1st BIT INTERNAL DAC INPUT REGISTER UPDATED WITH 18 MOST RECENT BITS 2nd BIT LSB 18th BIT NEXT WORD BITS CLOCKED TO SHIFT REGISTER Figure 9. AD1865 Timing Diagram REV. 0 –7– AD1865 –5V ANALOG SUPPLY SM5813AP/ APT +5V ANALOG SUPPLY AD1865 28 1 –VS +VS 24 2 27 2 TRIM TRIM 23 3 BCKO 26 3 MSB MSB 22 4 WCKO 25 4 IOUT IOUT 21 5 DOL 24 5 AGND 6 DOR 23 6 SJ SJ 19 7 VDD 22 7 RF VSS2 21 8 VOUT 1 8 9 VSS1 DG 10 11 12 OW18 13 OW20 14 C1 AGND 20 1 +VS 8 RF 18 2 7 VOUT 17 3 6 NC 16 4 20 9 19 10 DR DL 15 18 11 LR LL 14 17 12 CLK +VL LEFT CHANNEL OUTPUT C2 RIGHT CHANNEL OUTPUT 5 –VS NE5532 DGND 13 16 15 +5V DIGITAL SUPPLY Figure 10. Complete 8 × FS 18-Bit CD Player 18-BIT CD PLAYER DESIGN Figure 10 illustrates an 18-bit CD player design incorporating an AD1865 D/A converter, an NE5532 dual op amp and the SM5813 digital filter chip manufactured by NPC. In this design, the SM5813 filter transmits left and right digital data to both channels of the AD1865. The left and right latch signals, LL and LR, are both provided by the word clock signal (WCKO) of the digital filter. The digital filter supplies data at an 8 × FS oversample rate to each channel. The digital data is converted to analog output voltages by the output amplifiers on the AD1865. Note that no external components are required by the AD1865. Also, no deglitching circuitry is required. An NE5532 dual op amp is used to provide the output antialias filters required for adequate image rejection. One 2-pole filter section is provided for each channel. An additional pole is created from the combination of the internal feedback resistors (RF) and the external capacitors C1 and C2. For example, the nominal 3 kΩ RF with a 360 pF capacitor for C1 and C2 will place a pole at approximately 147 kHz, effectively eliminating all high frequency noise components. Low distortion, superior channel separation, low power consumption and a low parts count are all realized by this simple design. –8– REV. 0 AD1865 In this application, the advantages of choosing the AD1865 are clear. Its flexible digital interface allows the clock and data to be shared among all DACs. This reduces PC board area requirements and also simplifies the actual layout of the board. The low power requirements of the AD1865 (approximately 225 mW) is an advantage in a multiple DAC system where any power advantage is multiplied by the number of DACs used. The AD1865 requires no external components, simplifying the design, reducing the total number of components required and enhancing reliability. MULTICHANNEL DIGITAL KEYBOARD DESIGN Figure 11 illustrates how to cascade AD1865’s to add multiple voices to an electronic musical instrument. In this example, the data and clock signals are shared between all six DACs. As the data representing an output for a specific voice is loaded, the appropriate DAC is updated. For example, after the 18-bits representing the next output value for Voice 4 is clocked out on the data line, then “Voice 4 Load” is pulled low. This produces a new output for Voice 4. Furthermore, all voices can be returned to the same output by pulling all six load signals low. VOICE 2 OUTPUT VOICE 1 OUTPUT VOICE 3 OUTPUT VOICE 4 OUTPUT VOICE 5 OUTPUT VOICE 6 OUTPUT +5V ANALOG SUPPLY –5V ANALOG SUPPLY AD1865 AD1865 1 –V S 2 ANALOG COMMON TRIM 24 1 –V S TRIM 23 2 TRIM AD1865 +V S 24 1 –VS TRIM 23 2 TRIM 3 MSB MSB 22 21 4 IOUT IOUT AGND 20 5 AGND SJ 19 6 SJ RF 3 MSB MSB 22 3 MSB MSB 22 4 IOUT IOUT 21 4 IOUT IOUT 5 AGND AGND 20 5 AGND SJ 19 6 SJ RF RF 6 SJ 7 8 RF VOUT 9 +VL VOICE 1 LOAD +VS +V S 24 TRIM 23 21 AGND 20 SJ 19 RF 18 7 VOUT 17 8 VOUT +VL NC 16 9 +VL NC 16 18 7 VOUT 17 8 VOUT NC 16 9 RF 18 VOUT 17 10 DR DL 15 10 DR DL 15 10 DR DL 15 11 LR LL 14 11 LR LL 14 11 LR LL 14 DGND 13 12 CLK 12 CLK DGND 13 12 CLK DGND VOICE 6 LOAD 13 VOICE 2 LOAD VOICE 5 LOAD VOICE 3 LOAD VOICE 4 LOAD DATA CLOCK DIGITAL COMMON +5V DIGITAL SUPPLY Figure 11. Cascaded AD1865s in a Multichannel Keyboard Instrument REV. 0 –9– AD1865 ADDITIONAL APPLICATIONS –5V ANALOG SUPPLY Figures 12 through 14 show connection diagrams for the AD1865 and standard digital filter chips from Yamaha, NPC and Sony. Each figure is an example of cophase operation operating at 8 × FS for each channel. The 2-pole Rauch low-pass filters shown in Figure 10 can be used with all of the applications shown in this data sheet. +5V ANALOG SUPPLY AD1865 1 +VS 24 –V S 2 TRIM 3 MSB 2 3 4 V DD2 GND TEST 40 2 TEST TEST 39 3 TEST 38 4 TEST 37 5 36 1 –V S 16.9344 MHz CXD1244S 35 2 TRIM TRIM 23 3 MSB MSB 22 8 BCKO 33 4 IOUT 9 XIN DATAL 32 10 V DD 11 VDD GND 31 6 SJ SJ 19 GND 30 7 R RF 18 DATAR 29 12 13 28 9 +VL 14 LE/WS 27 10 DR 15 OUT 16/18 26 11 LR 16 25 17 LFS 12 CLK NC 16 DL 15 OUT L 6 WCO 11 11 LR 7 DRO 10 12 CLK DLO LL 14 DGND 13 9 LPF RIGHT CHANNEL OUTPUT LPF LEFT CHANNEL OUTPUT IOUT 21 AGND 20 F 8 V OUT +V 24 34 5 AGND V 9 Figure 12. AD1865 with Yamaha YM3434 Digital Filter S 7 6 8 13 SS LEFT CHANNEL OUTPUT VOUT 17 ST 14 V LPF +5V DIGITAL SUPPLY AD1865 +V RF 18 10 DR +5V ANALOG SUPPLY –5V ANALOG SUPPLY SJ 19 BCO 12 DD1 1 SJ 5 8 V OUT AGND 20 7 R F 6 SHR 16 16/18 15 21 I 5 AGND YM3434 SHL RIGHT CHANNEL OUTPUT MSB 22 4 IOUT 1 LPF 23 TRIM V OUT 17 NC 16 DL 15 LL 14 DGND 13 DPOL 24 18 SONY/12S 23 19 TEST 22 20 TEST TEST 21 –5V ANALOG SUPPLY +5V ANALOG SUPPLY AD1865 1 –V S +5V DIGITAL SUPPLY 2 TRIM Figure 13. AD1865 with Sony CXD1244s Digital Filter 3 MSB SM5818 4 IOUT 5 AGND 1 VDD 16 6 SJ 2 BCKO 15 7 RF 8 VOUT +VS 24 TRIM 23 RIGHT CHANNEL OUTPUT LPF LEFT CHANNEL OUTPUT MSB 22 IOUT 21 AGND 20 SJ 19 RF 18 VOUT 17 3 WDCO 14 4 OMOD2 13 9 +VL NC 16 5 DOR 12 10 DR DL 15 6 DOL 11 11 LR 7 10 12 CLK LPF LL 14 DGND 13 8 VSS OMOD1 9 +5V DIGITAL SUPPLY Figure 14. AD1865 with NPC SM5818AP Digital Filter –10– REV. 0 AD1865 OTHER DIGITAL AUDIO COMPONENTS AVAILABLE FROM ANALOG DEVICES –VS 1 DGND 2 +VL 3 NC 4 CLK 5 LE 6 DATA 7 –VL 8 16-BIT LATCH 16-BIT DAC AD1856 16-BIT AUDIO DAC 16 +VS 15 TRIM SERIAL INPUT REGISTER 14 MSB ADJ IOUT REF CONTROL LOGIC 13 IOUT Complete, No External Components Required 0.0025% THD Low Cost 16-Pin DIP or SOIC Package Standard Pinout 12 AGND 11 SJ 10 RF AD1856 9 VOUT NC = NO CONNECT –VS 1 DGND 2 +VL 3 NC 4 CLK 5 LE 6 DATA 7 –VL 8 18-BIT LATCH 18-BIT DAC AD1860 18-BIT AUDIO DAC 16 +VS 15 TRIM SERIAL INPUT REGISTER 14 MSB ADJ IOUT REF CONTROL LOGIC 13 IOUT Complete, No External Components Required 0.0025% THD+N 108 dB Signal-to-Noise Ratio 16-Pin DIP or SOIC Package Standard Pinout 12 AGND 11 SJ 10 RF AD1860 9 VOUT NC = NO CONNECT AD1862 20-BIT AUDIO DAC REV. 0 –VS 1 –VS 2 15 NR2 TRIM 3 14 ADJ +VL 4 13 NR1 CLK 5 LE 6 DATA 7 –VL 8 VL 1 LL 2 DL 3 CLK 4 DR 5 LR 6 DGND 7 VBIAS R 8 VOLTAGE REFERENCE 16 +VS 119 dB Signal-to-Noise Ratio 0.0016% THD+N 102 dB D-Range Performance ± 1 dB Gain Linearity 16-Pin DIP Package 12 AGND INPUT & DIGITAL OFFSET 20-BIT DAC 11 IOUT 10 RF AD1862 18-BIT DAC 9 AD1868 18-BIT SERIAL REGISTER VREF 18-BIT SERIAL REGISTER 18-BIT DAC DGND VREF 16 VBIAS L 15 VS 14 VOUT L 13 NRL 12 AGND 11 NRR 10 VOUT R 9 AD1868 +5 V SINGLE SUPPLY DUAL 18-BIT AUDIO DAC No External Components Required 0.004% THD+N 92 dB D-Range Performance ± 3 dB Gain Linearity 16-Pin DIP or SOIC Package VS –11– AD1865 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24 C1468–8–8/91 24-Pin Plastic DIP (N-24A) Package 13 0.580 (14.73) 0.485 (12.32) PIN 1 1 12 1.290 (32.70) 1.150 (29.30) 0.250 (6.35) SEATING PLANE 0.200 (5.05) 0.125 (3.18) 0.022 (0.558) 0.014 (0.356) 0.625 (15.87) 0.600 (15.24) 0.060 (1.52) 0.015 (0.38) 0.195 (4.95) 0.125 (3.18) 0.015 (0.381) 0.008 (0.204) 0.150 (3.81) 0.070 (1.77) 0.030 (0.77) 0.100 (2.54) BSC 28-Pin SOIC (R-28) Package 0.708 (18.02) 0.696 (17.67) 15 28 0.299 (7.6) 0.291 (7.39) 0.414 (10.52) 0.398 (10.10) 14 1 0.003 (0.76) 0.02 (0.51) 0.096 (2.44) 0.089 (2.26) 0.019 (0.49) 0.014 (0.35) 0.01 (0.254) 0.006 (0.15) 0.013 (0.32) 0.009 (0.23) 0.042 (0.32) 0.009 (0.23) 6° 0° PRINTED IN U.S.A. 0.050 (1.27) BSC –12– REV. 0 Package/Price Information Complete Dual 18-Bit 16 3 FS Audio DAC Model Status Package Description Pin Count Temperature Range Price* (100-499) AD1865N PRODUCTION PLASTIC/EPOXY DIP 24 COMMERCIAL $16.34 AD1865N-J PRODUCTION PLASTIC/EPOXY DIP 24 COMMERCIAL $19.64 AD1865N-K PRODUCTION PLASTIC/EPOXY DIP 24 COMMERCIAL $25.49 AD1865P PRODUCTION PLASTIC LEAD CHIP CARRIER 28 COMMERCIAL $16.34 AD1865R PRODUCTION STD S.O. PKG (SOIC) 28 COMMERCIAL $16.34 * This price is provided for budgetary purposes as recommended list price in U.S. Dollars per unit in the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing. View Pricing and Availability for further information.