Audio Subsystem with Class-D Speaker and Capless Headphone Driver
Each set of inputs is independently adjustable with the 2-wire I2C interface and features an adjustable gain over a 30 dB range in steps of 1 dB. Each set of input channels also offers the choice of variable input impedance PGA mode or fixed input impedance boost mode. The input signals are then mixed and routed to the desired set of outputs. This configuration is set using the 2-wire I2C control interface.
The SSM2804 includes three selectable output modes.
The first output mode is a stereo Class-D speaker driver capable of delivering 2 × 1.4 W of continuous power to an 8 Ω bridge-tied load (BTL) with 1% THD + N when using a 5 V supply. This Class-D amplifier incorporates three-level Σ-Δ output modulation designed to increase battery life and improve EMI performance. The Class-D amplifier offers an I2C-adjustable volume control with a gain range from +12 dB to −63 dB in 31 steps.
The second output mode is a pair of high performance head-phone drivers capable of delivering 20 mW per channel into stereo 32 Ω single-ended loads with 1% THD + N. The stereo headphone drivers use a highly efficient, true ground centered Class-G architecture. The headphone outputs incorporate I2C-adjustable volume control with a gain range from 0 dB to −75 dB in 32 steps.
The third output mode is an integrated receiver path bypass switch for passing voice signals from the audio baseband.
The SSM2804 is specified over the industrial temperature range of −40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. The SSM2804 is available in a 30-ball, 2.5 mm × 3.0 mm wafer level chip scale package (WLCSP).
- Mobile phones
- Portable multimedia devices
This designates products ADI does not recommend broadly for new designs.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Didn't find what you were looking for?
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.