The AD1994 class-D amplifier integrates a stereo ∑∆ modulator and stereo “bridge-tied" load (BTL) power stage onto a single die capable of delivering 50W of continuous power without a heat sink. The new ∑∆ modulator architecture uses a patented dynamic hysteresis algorithm to achieve audiophile performance (THD < 0.005 %, SNR > 105 dB) without compromising efficiency. The closed-loop architecture and continuous-time modulator front-end achieve a PSRR > 65 dB, and the stereo BTL power stage requires only a single supply that can operate over a wide voltage range. The ∑∆ modulator in the AD1994. designed to minimize radiated and conducted EMI and RF emissions, can optionally be used to drive external power devices to achieve arbitrarily high output power.

Applications

• Advanced televisions
• Compact multimedia systems
• Minicomponents
• Active loudspeakers

Part#	Instructions/Cycles	DAC DNR (dB)	DAC THD+N @ 1 kHz (-3dB)	ADC DNR (dB)	ADC THD+N (dB)	Digital I/O Channels	Analog I/O Channels	Product Description	Price* (1000-4999)
AD1940	1,536	n/a	n/a	-	-	16/16	0/0	SigmaDSP Multichannel 28-/56-Bit Audio Processor w/ 4-Wire SPI ® control interface.	$8.09
AD1941	1,536	n/a	n/a	-	-	16/16	0/0	SigmaDSP Multichannel 28-/56-Bit Audio Processor w/ 2-wire I2C ® control interface.	$8.35
AD1953	512	112	100	-	-	4/6	0/3	SigmaDSP 3 Ch, 26-/48-Bit Processing D/A	$7.06
AD1954	512	112	100	-	-	4/2	0/3	SigmaDSP 3 Ch, 26-/48-Bit Processing D/A	$7.06
ADAU1401	1,024	104	90	100	-83	8/8	2/4	28/56-Bit Automotive Audio Processor with Two ADCs and Four DACs	-
ADAU1701	1,024	104	90	100	-83	8/8	2/4	SigmaDSP® 28/56-Bit Audio Processor with Two ADCs and Four DACs	$4.47
ADAU1702	512	104	90	100	-83	8/8	2/4	SigmaDSP 28/56-Bit Audio Processor with 2 ADC/4 DAC	$3.53

* 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.

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• Obsolete: The specific part is obsolete and no longer available.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).

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For detailed drawings and chemical composition please consult our  Package Site

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• Military : -55 to +125 degrees Celsius
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• 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.

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