The AD1851/AD1861 is a monolithic PCM audio DAC. The AD1851 is a 16-bit device, while the AD1861 is an 18-bit device. Each device provides a voltage output amplifier, DAC, serial-to-parallel register and voltage reference. The digital portion of the AD1851/AD1861 is fabricated with CMOS logic elements that are provided by Analog Devices' 2 µm ABCMOS process. The analog portion of the AD1851/AD1861 is fabricated with bipolar and MOS devices as well as thin-film resistors.

This combination of circuit elements, as well as careful design and layout techniques, results in high performance audio play-back. Laser-trimming of the linearity error affords low total harmonic distortion. An optional linearity trim pin is provided to allow residual differential linearity error at midscale to be eliminated. This feature is particularly valuable for low distortion reproductions of low amplitude signals. Output glitch is also small, contributing to the overall high level of performance. The output amplifier achieves fast settling and high slew rates, providing a full ±3 V signal at load currents up to 8 mA. When used in current output mode, the AD1851/AD1861 provides a ±1 mA output signal. The output amplifier is short circuit protected and can withstand indefinite shorts to ground.

The serial input interface consists of the clock, data and latch enable pins. The serial 2s complement data word is clocked into the DAC, MSB first, by the external clock. The latch enable signal transfers the input word from the internal serial input register to the parallel DAC input register. The AD1851 input clock can support a 12.5 MHz data rate, while the AD1861 input clock can support a 13.5 MHz data rate. This serial input port is compatible with second generation digital filter chips used in consumer audio products. These filters operate at over-sampling rates of 2x, 4x, 8x and 16x sampling frequencies.

The critical specifications of THD+N and signal-to-noise ratio are 100% tested for all devices.

The AD1851/AD1861 operates with ±5 V power supplies, making it suitable for home use markets. The digital supply, V_L, can be separated from the analog supplies, V_S and -V_S , for reduced digital crosstalk. Separate analog and digital ground pins are also provided. Power dissipation is 100 mW typical.

The AD1851/AD1861 is available in either a 16-pin plastic DIP or a 16-pin plastic SOIC package. Both packages incorporate the industry standard pinout found on the AD1856 and AD1860 PCM audio DACs. As a result, the AD1851/AD1861 is a drop-in replacement for designs where ±5 V supplies have been used with the AD1856/AD1860. 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.

Part#	DAC DNR (dB)	SNR (dB)	DAC THD+N @ 1 kHz (-3dB)	Product Description	Price* (1000-4999)	Function
AD1933	110	110	96	192 kHz, 24-Bit CODEC w/ PLL	$3.62	DAC
AD1934	108	108	96	192 kHz, 24-Bit CODEC w/ PLL, I2C and SPI.	$3.11	DAC
AD1955	120	120	110	Multibit Sigma-Delta D/A w/ SACD Playback	$6.78	DAC
AD1853	116	117	104	24-bit 192 kHz Multibit Sigma-Delta DAC (Current Output)	$7.50	DAC
AD1852	114	114	104	Stereo, 24-bit 192 kHz Multibit Sigma-Delta D/A (Voltage Output)	$5.50	DAC
AD1854	113	112	97	Complete Single Chip Stereo Audio D/A	$4.00	DAC
AD1953	112	112	100	SigmaDSP 3 Ch, 26-/48-Bit Processing D/A	$7.06	DAC, Signal Processor
AD1954	112	112	100	SigmaDSP 3 Ch, 26-/48-Bit Processing D/A	$7.06	DAC, Signal Processor
AD1833A	110	110	95	Multi-Ch, 24-bit 192 kHz, Sigma-Delta D/A	$3.93	DAC
AD1958	109	108	96	Stereo, 24-bit 192 kHz Multibit Sigma-Delta D/A w/ PLL	-	DAC
AD1959	108	108	94	Stereo, 24-bit 192 kHz Multibit Sigma-Delta D/A, w/ PLL	-	DAC
AD1851	96	110	90	16-Bit, 16 3 FS PCM Audio DACs Dual 5V Supplies	$4.65	DAC
AD1857	94	-	90	Stereo, Single Supply 16/18/20-bit Sigma-Delta D/A	-	DAC
AD1859	94	-	88	Stereo, Single Supply 18-bit Integrated Sigma-Delta D/A	$4.40	DAC
AD1858	94	-	90	Stereo, Single Supply 16-bit Sigma-Delta D/A	-	DAC
AD1868	92	98	88	Single Supply Dual 18-Bit Audio DAC	$11.64	DAC
AD1866	90	95	86	Single Supply Dual 16-Bit Audio DAC	$10.44	DAC

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

The model number is a specific version of a generic that can be purchased or sampled.

Status indicates the current lifecycle of the product. This can be one of 4 stages:

• Pre-Release: The model has not been released to general production, but samples may be available.
• Production: The model is currently being produced, and generally available for purchase and sampling.
• Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
• Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).

The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

This is the acceptable operating range of the device. The various ranges specified are as follows:

• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.

Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.