a FEATURES Dual Serial Input, Voltage Output DACs Single +5 V Supply 0.004% THD+N (typ) Low Power: 50 mW (typ) 108 dB Channel Separation (min) Operates at 83 Oversampling 16-Pin Plastic DIP or SOIC Package APPLICATIONS Portable Compact Disc Players Portable DAT Players and Recorders Automotive Compact Disc Players Automotive DAT Players Multimedia Workstations Single Supply Dual 18-Bit Audio DAC AD1868* FUNCTIONAL BLOCK DIAGRAM VL 1 LL 2 DL 18-BIT DAC AD1868 16 VBL – 18-BIT SERIAL REGISTER 15 VS + 14 VOL 3 VREF CK 4 DR 5 LR 6 13 18-BIT SERIAL REGISTER NRL 12 AGND VREF 11 NRR + PRODUCT DESCRIPTION The AD1868 is a complete dual 18-bit DAC offering excellent performance while requiring a single +5 V power supply. It is fabricated on Analog Devices’ ABCMOS wafer fabrication process. The monolithic chip includes CMOS logic elements, bipolar and MOS linear elements, and laser-trimmed thin-film resistor elements. Careful design and layout techniques have resulted in low distortion, low noise, high channel separation, and low power dissipation. The DACs on the AD1868 chip employ a partially segmented architecture. The first three MSBs of each DAC are segmented into seven elements. The 15 LSBs are produced using standard R-2R techniques. The segments and R-2R resistors are laser trimmed to provide extremely low total harmonic distortion. The AD1868 requires no deglitcher or trimming circuitry. Low noise is achieved through the use of two noise-reduction capacitors. Each DAC is equipped with a high performance output amplifier. These amplifiers achieve fast settling and high slew rate, producing ± 1 V signals at load currents up to ± 1 mA. The buffered output signal range is 1.5 V to 3.5 V. Reference voltages of 2.5 V are provided, eliminating the need for “False Ground” networks. A versatile digital interface allows the AD1868 to be directly connected to all digital filter chips. Fast CMOS logic elements allow for an input clock rate of up to 13.5 MHz. This allows for operation at 2×, 4×, 8×, or 16× the sampling frequency for each channel. The digital input pins of the AD1868 are TTL and +5 V CMOS compatible. DGND 7 VBR 8 18-BIT DAC – 10 VOR 9 VS The AD1868 operates on +5 V power supplies. The digital supply, VL, can be separated from the analog supply, VS, for reduced digital feedthrough. Separate analog and digital ground pins are also provided. In systems employing a single +5 volt power supply, VL and VS should be connected together. In battery operated systems, operation will continue even with reduced supply voltage. Typically, the AD1868 dissipates 50 mW. The AD1868 is packaged in either a 16-pin plastic DIP or a 16pin plastic SOIC package. Operation is guaranteed over the temperature range of –35°C to +85°C and over the voltage supply range of 4.75 V to 5.25 V. PRODUCT HIGHLIGHTS 1. Single-supply operation @ +5 V. 2. 50 mW power dissipation (typical). 3. THD+N is 0.004% (typical). 4. Signal-to-Noise Ratio is 97.5 dB (typical). 5. 108 dB channel separation (minimum). 6. Compatible with all digital filter chips. 7. 16-pin DIP and 16-pin SOIC packages. 8. No deglitcher required. 9. No external adjustments required. *Protected by U.S. Patent Numbers: 3,961,326; 4,141,004; 4,349,811; 4,857,862; and patents pending. REV. A 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 AD1868–SPECIFICATIONS (typical at T = +258C and +5 V supplies unless otherwise noted) A Min RESOLUTION DIGITAL INPUTS VIH VIL IIH, VIH = VL IIL, VIL = DGND Maximum Clock Input Frequency ACCURACY Gain Error Gain Matching Midscale Error Midscale Error Matching Gain Linearity Error DRIFT (0°C to +70°C) Gain Drift Midscale Drift TOTAL HARMONIC DISTORTION + NOISE 0 dB, 990.5 Hz AD1868N AD1868N-J –20 dB, 990.5 Hz AD1868N AD1868N-J –60 dB, 990.5 Hz AD1868N AD1868N-J CHANNEL SEPARATION 1 kHz, 0 dB SIGNAL-TO-NOISE RATIO (with A-Weight Filter) D-RANGE (with A-Weight Filter) OUTPUT Voltage Output Pins (VOL, VOR) Output Range (± 3%) Output Impedance Load Current Bias Voltage Pins (VBL, VBR) Output Voltage Output Impedance POWER SUPPLY Specification, VL and VS Operation, VL and VS +I, VL and VS = 5 V POWER DISSIPATION TEMPERATURE RANGE Specification Operation Storage Typ 18 Max 2.4 0.8 1.0 1.0 13.5 4.75 3.5 % of FSR % of FSR mV mV dB ± 100 ± 100 ppm/°C µV/°C 0.008 0.006 0.08 0.08 5.0 5.0 % % % % % % dB dB dB ±1 0.1 ±1 V Ω mA +2.5 350 V Ω 5 10 50 0 –35 –60 V V µA µA MHz ±1 ±1 ± 15 ± 10 ±3 0.004 0.004 0.020 0.020 2.0 2.0 NIL* 97.5 92 108 95 86 Units Bit 25 5.25 5.25 14 70 V V mA mW 70 85 100 °C °C °C *Above 115 dB. Specifications subject to change without notice. ABSOLUTE MAXIMUM RATINGS* VL to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6 V VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6 V AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 0.3 V Digital Inputs to DGND . . . . . . . . . . . . . . . . . . . . . –0.3 to VL Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C, 10 sec *Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD1868 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. –2– WARNING! ESD SENSITIVE DEVICE REV. A AD1868 Typical Performance of the AD1868 –30 150 CHANNEL SEPARATION – dB –60dB –40 THD +N – dB –50 –60 –20dB –70 –80 140 130 120 110 0dB –90 –100 0.5 100 2.5 4.5 6.5 8.5 10.5 12.5 14.5 16.5 18.5 104 FREQUENCY – Hz 103 20.5 FREQUENCY – kHz Figure 2. Channel Separation vs. Frequency Figure 1. THD+N vs. Frequency 8 –20 –60dB 6 GAIN LINEARITY ERROR – dB –30 THD +N – dB –40 –50 –60 –20dB –70 0°C 4 2 25°C 0 –2 70°C –4 –80 0dB –90 4.4 4.6 4.8 5.0 VOLTAGE SUPPLY 5.2 –6 –100 5.4 –80 –60 –40 –20 –10 0 INPUT AMPLITUDE – dB Figure 4. Gain Linearity Error vs. Input Amplitude Figure 3. THD+N vs. Supply Voltage 90 –20 – 60dB 80 PSRR – dB THD +N – dB –40 –60 70 60 – 20dB –80 50 0dB –100 –50 –30 –10 10 30 50 70 90 110 130 40 102 140 TEMPERATURE – °C Figure 5. THD+N vs. Temperature REV. A 103 104 105 SUPPLY MODULATION FREQUENCY – Hz Figure 6. Power Supply Rejection Ratio vs. Frequency –3– AD1868 PIN CONFIGURATION PIN DESIGNATIONS VL 1 16 VBL LL 2 15 VS DL 3 14 VOL AD1868 CK 13 NRL 4 TOP VIEW (Not To Scale) 12 AGND DR 5 LR 6 11 NRR DGND 7 10 VOR VBR 8 9 VS DEFINITION OF SPECIFICATIONS Total Harmonic Distortion + Noise Total harmonic distortion plus noise (THD+N) is defined as the ratio of the square root of the sum of the squares of the amplitudes of the harmonics and noise to the amplitude of the fundamental input frequency. It is usually expressed in percent (%) or decibels (dB). D-Range Distortion D-range distortion is the ratio of the amplitude of the signal at an amplitude of –60 dB to the amplitude of the distortion plus noise. In this case, an A-weight filter is used. The value specified for D-range performance is the ratio measured plus 60 dB. Signal-to-Noise Ratio The signal-to-noise ratio is defined as the ratio of the amplitude of the output when a full-scale output is present to the amplitude of the output with no signal present. It is expressed in decibels (dB) and measured using an A-weight filter. Gain Linearity Gain linearity is a measure of the deviation of the actual output amplitude from the ideal output amplitude. It is determined by measuring the amplitude of the output signal as the amplitude of that output signal is digitally reduced to a lower level. A perfect D/A converter exhibits no difference between the ideal and actual amplitudes. Gain linearity is expressed in decibels (dB). Midscale Error Midscale error is the difference between the analog output and the bias when the twos complement input code representing midscale is loaded in the input register. Midscale error is expressed in mV. 11 12 13 14 15 16 17 18 19 10 11 12 13 14 15 16 VL LL DL CK DR LR DGND VBR VS VOR NRR AGND NRL VOL VS VBL Digital Supply (+5 Volts) Left Channel Latch Enable Left Channel Data Input Clock Input Right Channel Data Input Right Channel Latch Enable Digital Common Right Channel Bias Analog Supply (+5 Volts) Right Channel Output Right Channel Noise Reduction Analog Common Left Channel Noise Reduction Left Channel Output Analog Supply (+5 Volts) Left Channel Bias FUNCTIONAL DESCRIPTION The AD1868 is a complete, voltage output dual 18-bit digital audio DAC which operates with a single +5 volt supply. As shown in the block diagram, each channel contains a voltage reference, an 18-bit DAC, an output amplifier, an 18-bit input latch, and an 18-bit serial-to-parallel input register. The voltage reference section provides a reference voltage and a false ground voltage for each channel. The low noise bandgap circuits produce reference voltages that are unaffected by changes in temperature, time, and power supply. The output amplifier uses both MOS and bipolar devices and incorporates an NPN class-A output stage. It is designed to produce high slew rate, low noise, low distortion, and optimal frequency response. Each 18-bit DAC uses a combination of segmented decoder and R-2R architecture to achieve good integral and differential linearity. The resistors which form the ladder structure are fabricated with silicon-chromium thin film. Laser trimming of these resistors further reduces linearity error, resulting in low output distortion. The input registers are fabricated with CMOS logic gates. These gates allow fast switching speeds and low power consumption, contributing to the fast digital timing, low glitch, and low power dissipation of the AD1868. ORDERING GUIDE Model AD1868N AD1868R AD1868N-J AD1868R-J THD + N @ FS 0.008% 0.008% 0.006% 0.006% SNR 95 dB 95 dB 95 dB 95 dB Package Option* N-16 R-16 N-16 R-16 *N = Plastic DIP; R = SOIC. –4– REV. A AD1868 VL 1 LL 2 DL 3 CK 4 18-BIT DAC 18-BIT SERIAL REGISTER AD1868 16 VBL – 15 VS DAC, the AD1868 can continue to function at supply voltages as low as 3.5 V. Because of its unique design, the power requirements of the AD1868 diminish as the battery voltage drops, further extending the operating time of the system. + POWER SUPPLY 14 VOL VREF DR 5 LR 6 DGND 7 13 18-BIT SERIAL REGISTER AD1868 NRL 12 AGND VREF 11 NRR 0.1µF + VBR 18-BIT DAC – 8 10 VOR 9 VS 1 VL 2 LL VBL 16 0.1µF VS 15 3 DL VOL 14 4.7µF 4 CK NRL 13 5 DR AGND 12 6 LR NRR 11 7 DGND VOR 10 8 VBR VS 4.7µF 9 Functional Block Diagram Figure 7. Recommended Circuit Schematic ANALOG CIRCUIT CONSIDERATIONS GROUNDING RECOMMENDATIONS The AD1868 has two ground pins, designated as AGND (Pin 12) and DGND (Pin 7). The analog ground, AGND, serves as the “high quality” reference ground for analog signals and as a return path for the supply current from the analog portion of the device. The system analog common should be located as close as possible to Pin 12 to minimize any voltage drop which may develop between these two points, although the internal circuit is designed to minimize signal dependence of the analog return current. The digital ground, DGND, returns ground current from the digital logic portion of the device. This pin should be connected to the digital common node in the system. As shown in Figure 7, the analog and digital grounds should be joined at one point in the system. When these two grounds are remotely connected such as at the power supply ground, care should be taken to minimize the voltage difference between the DGND and AGND pins in order to ensure the specified performance. POWER SUPPLIES AND DECOUPLING The AD1868 has three power supply input pins. VS (Pins 9 and 15) provides the supply voltages which operate the analog portion of the device including the 18-bit DACs, the voltage references, and the output amplifiers. The VS supplies are designed to operate with a +5 V supply. These pins should be decoupled to analog common using a 0.1 µF capacitor. Good engineering practice suggests that the bypass capacitors be placed as close as possible to the package pins. This minimizes the inherent inductive effects of printed circuit board traces. NOISE REDUCTION CAPACITORS The AD1868 has two noise reduction pins designated as NRL (Pin 13) and NRR (Pin 11). It is recommended that external noise reduction capacitors be connected from these pins to AGND to reduce the output noise contributed by the voltage reference circuitry. As shown in Figure 7, each of these pins should be bypassed to AGND with a 4.7 µF or larger capacitor. The connections between the capacitors, package pins and AGND should be as short as possible to achieve the lowest noise. USING VBL AND VBR The AD1868 has two bias voltage reference pins, designated as VBR (Pin 8) and VBL (Pin 16). These pins supply a dc reference voltage equal to the center of the output voltage swing. These bias voltages replace “False Ground” networks previously required in single-supply audio systems. At the same time, they allow dccoupled systems, improving audio performance. Figure 8a illustrates the traditional approach used to generate False Ground voltages in single-supply audio systems. This circuit requires additional power and circuit board space. VL (Pin 1) operates the digital portions of the chip including the input shift registers and the input latching circuitry. VL is also designed to operate with a +5 V supply. This pin should be bypassed to digital common using a 0.1 µF capacitor, again placed as close as possible to the package pin. Figure 7 illustrates the correct connection of the digital and analog supply bypass capacitors. 1 DGND 2 +VL 3 NC 4 CLK 5 16-BIT LATCH 16-BIT DAC SERIAL INPUT REGISTER IOUT 16 +VS 15 TRIM 14 MSB ADJ 13 IOUT 12 AGND CONTROL LOGIC An important feature of the AD1868 audio DAC is its ability to operate at reduced power supply voltages. This feature is very important in portable battery operated systems. As the batteries discharge, the supply voltage drops. Unlike any other audio REV. A –VS LE 6 11 SJ DATA 7 10 RF NC 8 9 VOUT AD1851 NC = NO CONNECT Figure 8a. Schematic Using False Ground –5– AD1868 + 5V AD1868 1 VL 2 VOL VBL 16 LL VS 15 3 DL VOL 14 4 CK NRL 13 5 DR AGND 12 6 LR NRR 11 7 DGND VOR 10 8 VBR VS 9 + 5V VOR Figure 8b. Circuitry Using Voltage Biases The AD1868 eliminates the need for “False Ground” circuitry. VBR and VBL generate the required bias voltages previously generated by the “False Ground.” As shown in Figure 8b, VBR and VBL may be used as the reference point in each output channel. This permits a dc-coupled output signal path. This eliminates ac-coupling capacitors and improves low frequency performance. It should be noted that these bias outputs have relatively high output impedance and will not drive output currents larger than 100 µA without degrading the specified performance. DISTORTION PERFORMANCE AND TESTING The THD+N figure of an audio DAC represents the amount of undesirable signal produced during reconstruction and playback of an audio waveform. Therefore, the THD+N specification provides a direct method to classify and choose an audio DAC for a desired level of performance. Figure 1 illustrates the typical THD+N versus frequency performance of the AD1868. It is evident that the THD+N performance of the AD1868 remains stable at all three levels through a wide range of frequencies. A load impedance of at least 2 kΩ is recommended for best THD+N performance. Analog Devices tests and grades all AD1868s on the basis of THD+N performance. During the distortion test, a high speed digital pattern generator transmits digital data to each channel of the device under test. Eighteen-bit data is latched into the DAC at 352.8 kHz (8× FS). The test waveform is a 990.5 Hz sine wave with 0 dB, –20 dB, and –60 dB amplitudes. A 4096point FFT calculates total harmonic distortion + noise, signal-to-noise ratio, and D-range. No deglitchers or external adjustments are used. DIGITAL CIRCUIT CONSIDERATIONS INPUT DATA The AD1868 digital input port employs five signals: Data Left (DL), Data Right (DR), Latch Left (LL), Latch Right (LR) and Clock (CLK). DL and DR are the serial inputs for the left and right DACs, respectively. Input data bits are clocked into the input register on the rising edge of CLK. The falling edges of LL and LR cause the last 18 bits which were clocked into the serial registers to be shifted into the DACs, thereby updating the respective DAC outputs. 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. Data is transmitted to the AD1868 in a bit stream composed of 18-bit words with a serial, twos complement, MSB first format. Left and right channels share the Clock (CLK) signal. Figure 9 illustrates the general signal requirements for data transfer for the AD1868. CLK DL MSB LSB DR MSB LSB LL LR Figure 9. Control Signals –6– REV. A AD1868 TIMING AD1868 drops. This extends the usable battery life. Finally, as the battery supply voltage drops, the bias voltages and signal swings also drop, preventing signal clipping and abrupt degradation of distortion. Figure 3 illustrates that THD+N performance of the AD1868 remains constant through a wide range of supply voltages. Figure 10 illustrates the specific timing requirements that must be met in order for the data transfer to be accomplished properly. The input pins of the AD1868 are TTL and 5 V CMOS compatible. The maximum clock rate of the AD1868 is specified to be at least 13.5 MHz. This clock rate allows data transfer rates of 2×, 4×, 8×, and 16× FS (where FS equals 44.1 kHz). The applications section of this data sheet contains additional guidelines for using the AD1868. Automotive equipment rely on components which are able to consistently perform in a wide range of temperatures. In addition, due to the limited space available in automotive applications, small size is essential. The AD1868 is able to satisfy both of these requirements. The device has guaranteed specified performance between 0°C and +70°C, and the 16-pin DIP or 16pin SOIC package is particularly attractive where overall size is important. > 74./ ns >30ns >30ns CLK >60ns >15ns >40ns >40ns LATCH ENABLE (LE) Since the AD1868 provides dc bias voltages, the entire signal chain can be dc-coupled. This eliminate ac-coupling capacitors from the signal path, improving low frequency performance and lowering system cost and size. >30ns INTERNAL DAC INPUT REGISTER UPDATED WITH 18 MOST RECENT BITS >10ns >10ns DATA MSB 1st BIT LSB (18th BIT) 2nd BIT NEXT WORD In summary, the AD1868 is an excellent choice for battery operated portable or automotive digital audio systems. In the following sections, some examples of high performance audio applications featuring the AD1868 are described. BITS CLOCKED TO SHIFT REGISTER Figure 10. Input Signal Timing AD1868 with Sony CXD2550P Digital Filter APPLICATIONS OF THE AD1868 Figure 11 illustrates an 18-bit CD player design incorporating an AD1868 DAC, a Sony CXD2550P digital filter and 2-pole antialias filters. This high performance, single supply design operates at 8× FS and is suitable for portable and automotive applications. In this design, the CXD2550P filter transmits left and right channel digital data to the AD1868. The left and right latch signals, LL and LR, are both provided by the word clock signal (LRCKO) of the digital filter. The digital data is converted to low distortion output voltages by the output amplifiers on the AD1868. Also, no deglitching circuitry or external adjustments are required. Bypass capacitors, noise reduction capacitors and the antialias filter details are omitted for clarity. The AD1868 is a high performance audio DAC specifically designed for portable and automotive digital audio applications. These market segments have technical requirements fundamentally different than those found in the high-end or home-use market segments. Portable equipment must rely on components which require low amounts of power to offer reasonable playing times. Also, battery voltages drop as the end of the discharge cycle is approached. The AD1868’s ability to operate from a single +5 V supply makes it a good choice for battery-operated gear. As the battery voltage drops, the power dissipation of the +5V POWER SUPPLY AD1868 CXD2550P 1 TEST 2 8Fs/4Fs LEFT CHANNEL OUTPUT VBL 16 SLOT 18 1 VL LRCK0 17 2 LL VS 15 1 3 DL VOL 14 2 DATAR 15 4 CK NRL 13 3 VSS 14 5 DR AGND 12 4 6 BCKO 13 6 LR NRR 11 7 12 7 DGND VOR 10 8 11 8 VBR 9 10 3 DATAL 16 4 5 VDD INIT VS VS 7 6 AGND 9 Figure 11. AD1868 with Sony CXD2550P Digital Filter REV. A –7– 8 5 RIGHT CHANNEL OUTPUT AD1868 ADDITIONAL APPLICATIONS Figures 12, 13, and 14 show connection diagrams for the AD1868 with popular digital filter chips from NPC and Yamaha. Each application operates at 8× FS operation. Please refer to the appropriate sections of this data sheet for additional information. In addition to CD player designs, the AD1868 is suitable for similar applications such as DAT, portable musical instruments, Laptop and Notebook personal computers, and PC audio I/O boards. The circuit techniques illustrated are directly applicable in those applications. +5V POWER SUPPLY AD1868 SM5813 1 28 1 VL VBL 16 2 27 2 LL VS 15 3 BCKO 26 3 DL VOL 14 4 WCKO 25 4 CK NRL 13 5 DOL 24 5 DR AGND 12 6 DOR 23 6 LR NRR 11 7 VDD 22 7 DGND VOR 10 8 VSS2 21 8 VBR VSS1 9 20 10 19 11 18 12 OW18 17 13 OW20 16 14 COB 15 VS 9 LOW PASS FILTER LEFT CHANNEL OUTPUT LOW PASS FILTER RIGHT CHANNEL OUTPUT Figure 12. AD1868 with NPC SM5813 Digital Filter +5V POWER SUPPLY SM5818AP AD1868 1 VDD 16 1 VL VBL 16 2 BCKO 15 2 LL VS 15 3 WDCO 14 3 DL VOL 14 4 13 4 CK NRL 13 5 DOR 12 5 DR AGND 12 6 DOL 11 6 LR NRR 11 10 7 DGND VOR 10 9 8 VBR 7 8 VSS VS 9 LOW PASS FILTER LEFT CHANNEL OUTPUT LOW PASS FILTER RIGHT CHANNEL OUTPUT Figure 13. AD1868 with NPC SM5818AP Digital Filter –8– REV. A AD1868 +5V POWER SUPPLY YM3434 AD1868 1 16 1 VL VBL 16 2 16/18 15 2 LL VS 15 3 ST 14 3 DL VOL 14 VSS 13 4 CK NRL 13 5 BCO 12 5 DR AGND 12 6 WCO 11 6 LR NRR 11 7 DRO 10 7 DGND VOR 10 DLO 9 8 VBR 4 VDD2 VDD1 8 VS 9 LOW PASS FILTER LEFT CHANNEL OUTPUT LOW PASS FILTER RIGHT CHANNEL OUTPUT Figure 14. AD1868 with Yamaha YM3434 Digital Filter OTHER DIGITAL AUDIO COMPONENTS AVAILABLE FROM ANALOG DEVICES –VS 1 DGND 2 +VL 3 NC 4 CLK 5 16-BIT LATCH 16-BIT DAC SERIAL INPUT REGISTER IOUT –VS 1 TRIM DGND 2 14 MSB ADJ +VL 3 13 IOUT NC 4 12 AGND CLK 5 16 +VS 15 18-BIT LATCH 18-BIT DAC SERIAL INPUT REGISTER IOUT 16 +VS 15 TRIM 14 MSB ADJ 13 IOUT 12 AGND CONTROL LOGIC CONTROL LOGIC LE 6 11 SJ LE 6 11 SJ DATA 7 10 RF DATA 7 10 RF –VL 8 –VL 8 9 VOUT VOUT NC = NO CONNECT NC = NO CONNECT REV. A 9 AD1860 AD1856 AD1856 16-Bit Audio DAC AD1860 18-Bit Audio DAC Complete, No External Components Required 16-Pin DIP or SOIC Package Standard Pinout Low Cost Complete, No External Components Required 102 dB SNR Minimum 16-Pin DIP or SOIC Package Standard Pinout –9– AD1868 –VS 1 DGND 2 +VL 3 NC 4 CLK 5 16-BIT LATCH 16-BIT DAC SERIAL INPUT REGISTER IOUT –VS 1 TRIM DGND 2 14 MSB ADJ +VL 3 13 IOUT NC 4 12 AGND CLK 5 16 +VS 15 18-BIT LATCH 18-BIT DAC SERIAL INPUT REGISTER IOUT CONTROL LOGIC 16 +VS 15 TRIM 14 MSB ADJ 13 IOUT 12 AGND CONTROL LOGIC LE 6 11 SJ LE 6 11 SJ DATA 7 10 RF DATA 7 10 RF NC 8 NC 8 9 VOUT 9 AD1851 –VS 1 TRIM 2 MSB 3 IOUT NC = NO CONNECT NC = NO CONNECT AD1851 16-Bit PCM Audio DAC AD1861 18-Bit PCM Audio DAC 107 dB SNR Minimum 16 × FS Capability ± 5 V Supply 107 dB SNR Minimum 16 × FS Capability ± 5 V Supply 24 +VS 23 24 +VS 23 TRIM 22 MSB 4 21 IOUT AGND 5 20 AGND SJ 6 19 SJ RF 7 18 RF VOUT 8 17 VOUT +VL 9 16 NC DR 10 15 DL LR 11 14 LL CK 12 13 DGND –VS 1 TRIM TRIM 2 22 MSB MSB 3 4 21 IOUT IOUT AGND 5 20 AGND SJ 6 19 SJ RF 7 18 RF VOUT 8 17 VOUT +VL 9 16 –VL DR 10 15 DL LR 11 14 LL CK 12 13 DGND AD1864 REFERENCE REFERENCE – + 18-BIT LATCH VOUT AD1861 – + 18-BIT DAC 18-BIT DAC 18-BIT LATCH AD1865 REFERENCE REFERENCE – + 18-BIT LATCH – + 18-BIT DAC 18-BIT DAC 18-BIT LATCH NC = NO CONNECT AD1864 Dual 18-Bit Audio DAC AD1865 Dual 18-Bit Audio DAC Complete, No External Components High Performance Low Crosstalk 24-Pin DIP THD+N = 0.004% (typical) 107 dB SNR Minimum 16 × FS Capability THD+N = 0.004% (typical) ± 5 V Supply –10– REV. A AD1868 –VS 1 –VS VOLTAGE REFERENCE 16 +VS 2 15 NR2 TRIM 3 14 ADJ +VL 4 13 NR1 CLK 5 12 AGND 11 IOUT 10 RF 9 DGND LE 6 DATA 7 –VL 8 INPUT & DIGITAL OFFSET 20-BIT DAC AD1862 AD1862 20-Bit, Low Noise Audio DAC 110 dB SNR Minimum THD+N = 0.0019% (typical) ± 1 dB Gain Linearity 16-Pin Plastic DIP REV. A –11– AD1868 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). C1478–7–10/90 Plastic DIP (N) Package 9 16 0.31 0.25 (6.35) (7.87) 1 8 0.87 (22.1) MAX 0.035 (0.89) 0.18 (4.57) 0.18 (4.57) MAX 0.125 (3.18) MIN 0.011 (0.28) 0.3 (7.62) 0.033 (0.84) 0.1 (2.54) Plastic SOIC (R) Package 9 16 0.419 (10.65) 0.299 (7.60) 8 1 0.413 (10.50) 0.012 (0.3) 0.104 (2.65) 0.050 (1.27) REF 0.019 (0.49) 0.030 (0.75) 0.042 (1.07) 0.013 (0.32) PRINTED IN U.S.A. 0.018 (0.46) –12– REV. A