Low Cost, Low Power Mono Audio Codec AD74111 FEATURES GENERAL DESCRIPTION 2.5 V Mono Audio Codec with 3.3 V Tolerant The AD74111 is a front-end processor for general-purpose audio Digital Interface and voice applications. It features a multibit - A/D conversion Supports 8 kHz to 48 kHz Sample Rates channel and a multibit - D/A conversion channel. The ADC Supports 16-/20-/24-Bit Word Lengths channel provides >67 dB THD+N and the DAC channel pro- Multibit - Modulators with vides >88 dB THD+N, both over an audio signal bandwidth. Perfect Differential Linearity Restoration for The AD74111 is particularly suitable for a variety of applications Reduced Idle Tones and Noise Floor where mono input and output channels are required, including Data Directed Scrambling DAC Least Sensitive to Jitter audio sections of digital video camcorders, portable personal Performance (20 Hz to 20 kHz) audio devices, and telematic applications. Its high quality 85 dB ADC Dynamic Range performance also makes it suitable for speech and telephony 93 dB DAC Dynamic Range applications such as speech recognition and synthesis, and modern Programmable ADC Gain feature phones. On-Chip Volume Control for DAC Channel An on-chip reference voltage is included but can be powered Software Controllable Clickless Mute down and bypassed by an external reference source if required. Supports 256 f , 512 f , and 768 f Master Mode S S S Clocks The AD74111 offers sampling rates that, depending on MCLK Master Clock Prescaler for Use with DSP Master Clocks selection and MCLK divider ratio, range from 8 kHz in the On-Chip Reference voiceband range to 48 kHz in the audio range. 16-Lead TSSOP Package The AD74111 is available in a 16-lead TSSOP package option and is specified for the automotive temperature range of 40C APPLICATIONS to +105C. Digital Video Camcorders (DVC) Portable Audio Devices (Walkman , PDAs, and so on) Audio Processing Voice Processing Telematic Systems General-Purpose Analog I/O FUNCTIONAL BLOCK DIAGRAM RESET MCLK DVDD1 DVDD2 AVDD ADC CAPP DIGITAL - GAIN DIN VIN FILTER MODULATOR STAGE SERIAL DOUT CAPN DATA DFS PORT DCLK DAC CHANNEL DIGITAL VOLUME - DAC REFERENCE VOUT FILTER CONTROL MODULATOR REFCAP DGND AGND REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Trademarks and Fax: 781/326-8703 2003 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective companies.(AVDD = 2.5 V 5%, DVDD2 = 2.5 V 5%, DVDD1 = 2.5 V 5%, f = 12.288 MHz, MCLK AD74111SPECIFICATIONS f = 48 kHz, T = T to T , unless otherwise noted.) S A MIN MAX Parameter Conditions Min Typ Max Unit ANALOG-TO-DIGITAL CONVERTERS ADC Resolution 24 Bits Signal to Noise Ratio (SNR) f = 16 kHz 70 77 dB S Dynamic Range (20 Hz to 20 kHz, 60 dB Input) No Filter f = 48 kHz 85 dB S f = 16 kHz 78 85 dB S With A-Weighted Filter f = 48 kHz 87 dB S Total Harmonic Distortion + Noise f = 48 kHz, PGA = 0 dB 67 dB S f = 16 kHz 75 dB S Programmable Input Gain 12 dB Gain Step Size 3dB Offset Error 55 +30 +80 mV Full-Scale Input Voltage 0.5 V rms Input Resistance 4k Input Capacitance 15 pF Common-Mode Input Volts 1.125 V Crosstalk ADC Input Signal = 1.0 kHz, 100 dB 0 dB DAC Output = DC DIGITAL-TO-ANALOG CONVERTERS DAC Resolution 24 Bits Signal to Noise Ratio (SNR) f = 16 kHz 80 89 dB S Dynamic Range (20 Hz to 20 kHz, 60 dB Input) No Filter f = 48 kHz 93 dB S f = 16 kHz 84 93 dB S With A-Weighted Filter f = 48 kHz 95 dB S Total Harmonic Distortion + Noise f = 48 kHz 88 dB S f = 16 kHz 88 81 dB S dB DC Accuracy Offset Error 75 10 +50 mV Gain Error 0.9 +0.175 +0.8 dB Volume Control Step Size (1024 Linear Steps) 0.098 % Volume Control Range (Max Attenuation) 60 dB Mute Attenuation 100 dB De-emphasis Gain Error 0.1 dB Full-Scale Output Voltage 0.5 V rms Output Resistance 145 Common Mode Output Volts 1.125 V Crosstalk Signal Input ADC = AGND 95 dB DAC Output Level = 1.0 kHz, 0 dB REFERENCE (Internal) Absolute Voltage, V 1.125 V REF V TC 50 ppm/C REF 2 REV. 0