16-Bit/18-Bit, 16 3 F S a PCM Audio DACs AD1851/AD1861 FUNCTIONAL BLOCK DIAGRAM FEATURES 110 dB SNR Fast Settling Permits 163 Oversampling V 1 +V 16 S LATCH S DAC 63 V Output 2 TRIM Optional Trim Allows Super-Linear Performance DGND 15 65 V Operation SERIAL +V 3 14 MSB ADJ L INPUT 16-Pin Plastic DIP and SOIC Packages REGISTER NC 4 I I OUT 13 OUT Pin-Compatible with AD1856 & AD1860 Audio DACs 2s Complement, Serial Input CLK 5 AGND 12 CONTROL LOGIC SJ APPLICATIONS LE 6 11 High-End Compact Disc Players R DATA 7 10 F Digital Audio Amplifiers AD1851/ V NC 8 9 OUT DAT Recorders and Players AD1861 Synthesizers and Keyboards NC = NO CONNECT PRODUCT DESCRIPTION The critical specifications of THD+N and signal-to-noise ratio The AD1851/AD1861 is a monolithic PCM audio DAC. The are 100% tested for all devices. AD1851 is a 16-bit device, while the AD1861 is an 18-bit de- The AD1851/AD1861 operates with 5 V power supplies, mak- vice. Each device provides a voltage output amplifier, DAC, ing it suitable for home use markets. The digital supply, V , can L serial-to-parallel register and voltage reference. The digital por- be separated from the analog supplies, V and V , for reduced S S tion of the AD1851/AD1861 is fabricated with CMOS logic digital crosstalk. Separate analog and digital ground pins are elements that are provided by Analog Devices 2 m ABCMOS also provided. Power dissipation is 100 mW typical. process. The analog portion of the AD1851/AD1861 is fabri- The AD1851/AD1861 is available in either a 16-pin plastic DIP cated with bipolar and MOS devices as well as thin-film or a 16-pin plastic SOIC package. Both packages incorporate resistors. the industry standard pinout found on the AD1856 and This combination of circuit elements, as well as careful design AD1860 PCM audio DACs. As a result, the AD1851/AD1861 and layout techniques, results in high performance audio play- is a drop-in replacement for designs where 5 V supplies have back. Laser-trimming of the linearity error affords low total har- been used with the AD1856/AD1860. Operation is guaranteed monic distortion. An optional linearity trim pin is provided to over the temperature range of 25C to +70C and over the allow residual differential linearity error at midscale to be elimi- voltage supply range of 4.75 V to 5.25 V. nated. This feature is particularly valuable for low distortion reproductions of low amplitude signals. Output glitch is also PRODUCT HIGHLIGHTS small, contributing to the overall high level of performance. The l. AD1851 16-bit resolution provides 96 dB dynamic range. output amplifier achieves fast settling and high slew rates, pro- AD1861 18-bit resolution provides 108 dB dynamic range. viding a full 3 V signal at load currents up to 8 mA. When 2. No external components are required. used in current output mode, the AD1851/AD1861 provides a 1 mA output signal. The output amplifier is short circuit 3. Operates with 5 V supplies. protected and can withstand indefinite shorts to ground. 4. Space saving 16-pin SOIC and plastic DIP packages. The serial input interface consists of the clock, data and latch 5. 100 mW power dissipation. enable pins. The serial 2s complement data word is clocked into 6. High input clock data rates and 1.5 s settling time permits the DAC, MSB first, by the external clock. The latch enable 23, 43, 83 and 163 oversampling. signal transfers the input word from the internal serial input register to the parallel DAC input register. The AD1851 input 7. 3 V or 1 mA output capability. clock can support a 12.5 MHz data rate, while the AD1861 in- 8. THD + Noise and SNR are 100% tested. put clock can support a 13.5 MHz data rate. This serial input 9. Pin-compatible with AD1856 & AD1860 PCM audio DACs. port is compatible with second generation digital filter chips used in consumer audio products. These filters operate at over- sampling rates of 23, 43, 83 and 163 sampling frequencies. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-8703 OBSOLETE(T +258C and 65 V supplies, unless otherwise noted) AD1851/AD1861SPECIFICATIONS A Min Typ Max Units DIGITAL INPUTS V 2.0 +V V IH L V 0.8 V IL I , V = V 1.0 A IH IH L I , V = 0.4 10 A IL IL ACCURACY Gain Error 1% Midscale Output Voltage 10 mV DRIFT (0C to +70C) Total Drift 25 ppm of FSR/C Bipolar Zero Drift 4 ppm of FSR/C SETTLING TIME (To 0.0015% of FSR) Voltage Output 6 V Step 1.5 s 1 LSB Step 1.0 s Slew Rate 9 V/s Current Output 1 mA Step 10 to 100 Load 350 ns 1 k Load 350 ns OUTPUT Voltage Output Configuration Bipolar Range 62.88 3.0 63.12 V Output Current 8mA Output Impedance 0.1 Short Circuit Duration Indefinite to Common Current Output Configuration Bipolar Range (30%) 1.0 mA Output Impedance (30%) 1.7 k POWER SUPPLY Voltage +V and +V 4.75 5.25 V L S V 5.25 4.75 V S TEMPERATURE RANGE Specification 0 +25 +70 C Operation 25 +70 C Storage 60 +100 C WARM-UP TIME 1 min Specifications subject to change without notice. 16-BIT 16-BIT 16-BIT 16-BIT V +V V +V 1 16 S 1 16 S S S LATCH DAC LATCH DAC DGND DGND 2 15 TRIM 2 15 TRIM SERIAL SERIAL +V +V L 3 14 MSB ADJ L 3 14 MSB ADJ INPUT INPUT REGISTER REGISTER NC I I NC I I 4 OUT 13 4 OUT OUT 13 OUT CLK 12 AGND 12 AGND 5 CLK 5 CONTROL CONTROL LOGIC LOGIC LE 6 11 SJ LE 6 11 SJ DATA R 7 10 DATA 10 R F 7 F V NC OUT V 8 9 NC OUT AD1851 8 AD1851 9 NC = NO CONNECT NC = NO CONNECT AD1851 Functional Block Diagram AD1861 Functional Block Diagram 2 REV. A OBSOLETE