The SSM2311 is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 3 W of continuous output power with less than 1% THD + N driving a 3 Ω load from a 5.0 V supply.

The SSM2311 features a high efficiency, low noise modulation scheme that does not require any external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 90% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR that is better than 98 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

The SSM2311 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.

The device also includes pop-and-click suppression circuitry. This minimizes voltage glitches at the output during turn-on and turn-off, thus reducing audible noise on activation and deactivation.

The fully differential input of the SSM2311 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the dc input common-mode voltage is approximately VDD/2.

The default gain of SSM2311 is 18 dB, but users can reduce the gain by using a pair of external resistors (see the Gain section). The SSM2311 is specified over the industrial temperature range (−40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package (WLCSP).

Applications

Mobile phones

MP3 players

Portable gaming

Portable electronics

Educational toys

Data Sheet, Rev. 0, 1/08

Part#	Output Power (W)	Efficiency (%)	Dynamic Range (dB)	SNR (dB)	THD+N (dB)	Pos Supply	Supply Current (max)	Price* (1000-4999)
AD1990	5	84	102	102	-90	+8V to +12V	30mA	$6.60
AD1991	20	87	-	-	-	+4.5V to +5.5V	2.75mA	$7.91
AD1992	10	84	102	102	-90	+8V to +20V	30mA	$6.73
AD1994	25	84	102	102	-90	+8V to +20V	30mA	$6.87
ADAU1590	15.5	90	101	101	-	+3V to +3.6V	60µA	$3.45
ADAU1592	18	87	101	101	-85	+9V to +18V	44mA	$3.62
SSM2301	1.4	85	-	98	-	+2.5V to +5V	4.2mA	$0.32
SSM2302	2	85	-	98	-67	+2.5V to +5V	-	$0.91
SSM2304	2	85	-	102	-67	+2.5V to +5V	7mA	$0.62
SSM2306	2	87	-	96	-	+2.5V to +5V	6.5mA	$0.69
SSM2311	3	85	-	98	-67	+2.5V to +5.5V	4.2mA	$0.72
SSM2315	3	93	-	103	-	+2.5V to +5.5V	3.3mA	$0.81

* 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

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.

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