CS3308/18 High-Performance 8-Channel Analog Volume Control0 pages

CS3308 8-Channel Analog Volume Control Features ♦ Complte Analog Volume Control - 8 Independently Controllable Channels - 3 Configurable Master Volume and Muting Controls ♦ Wide Adjustable Volume Range - -96 dB to +22 dB in % dB Steps ♦ Low Distortion & Noise - -112 dB THD+N - 123 dB Dynamic Range ♦ Noise-Free Level Transitions - Zero-Crossing Detection with Programmable Time-Out ♦ Low Channel-to-Channel Crosstalk - 120 dB Inter-Channel Isolation ♦ Comprehensive Serial Control Port - Supports I2C® and SPITM Communication - Independent Control of up to 128 Devices on a Shared 2-Wire PC or 3-Wire SPI Control Bus - Supports Individual and Grouped Control of all CS3308 Devices on the PC or SPI Control Bus ♦ Standard Power Supply Voltages - ±5 V Analog Supply - +3.3 V Digital Supply Description The CS3308 is an 8-channel digitally controlled analog volume control designed specifically for high-end audio systems. It features a comprehensive PC/SPI serial control port for easy device and volume configuration. The CS3308 includes arrays of well-matched resistors and complementary low-noise active output stages. A total adjustable range of 118 dB, in %dB steps, is spread evenly over 96 dB of attenuation and 22 dB of gain. The CS3308 implements configurable zero-crossing detection to provide glitch-free volume-level changes. The PC/SPI control interface provides for easy system integration of up to 128 CS3308 devices over a single 2-wire PC or 3-wire SPI bus, allowing many channels of volume control with minimal system controller I/O re-quirements. Devices may be controlled on an individual and grouped basis, simplifying simultaneous configuration of a group of channels across multiple devices, while allowing discrete control over all channels on an individual basis. The device operates from ±5 V analog supplies and has an input/output voltage range of ±3.65 V. The digital control interface operates at +3.3 V. The CS3308 is available in a 48-pin LQFP package in Commercial grade (-10° to 70° C). The CS3308 Cus-tomer Demonstration board is also available for device evaluation. Refer to "Ordering Information" on page 44 for complete details. 8-Channel Analog ■ Inputs PC/SPI Serial Control f CIRRUS LOGIC Copyright © Cirrus Logic, Inc. 2006 DECEMBER '06 http://www.cirrus.com (Al1 Rights Reserved) DS702F1