AD74111| Datasheet

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Low Cost, Low Power Mono Audio Codec AD74111
FEATURES 2.5 V Mono Audio Codec with 3.3 V Tolerant Digital Interface Supports 8 kHz to 48 kHz Sample Rates Supports 16-/20-/24-Bit Word Lengths Multibit - Modulators with "Perfect Differential Linearity Restoration" for Reduced Idle Tones and Noise Floor Data Directed Scrambling DAC Least Sensitive to Jitter Performance (20 Hz to 20 kHz) 85 dB ADC Dynamic Range 93 dB DAC Dynamic Range Programmable ADC Gain On-Chip Volume Control for DAC Channel Software Controllable Clickless Mute Supports 256 f S, 512 fS, and 768 fS Master Mode Clocks Master Clock Prescaler for Use with DSP Master Clocks On-Chip Reference 16-Lead TSSOP Package APPLICATIONS Digital Video Camcorders (DVC) Portable Audio Devices (Walkman , PDAs, and so on) Audio Processing Voice Processing Telematic Systems General-Purpose Analog I/O GENERAL DESCRIPTION

The AD74111 is a front-end processor for general-purpose audio and voice applications. It features a multibit - A/D conversion channel and a multibit - D/A conversion channel. The ADC channel provides >67 dB THD+N and the DAC channel provides >88 dB THD+N, both over an audio signal bandwidth. The AD74111 is particularly suitable for a variety of applications where mono input and output channels are required, including audio sections of digital video camcorders, portable personal audio devices, and telematic applications. Its high quality performance also makes it suitable for speech and telephony applications such as speech recognition and synthesis, and modern feature phones. An on-chip reference voltage is included but can be powered down and bypassed by an external reference source if required. The AD74111 offers sampling rates that, depending on MCLK selection and MCLK divider ratio, range from 8 kHz in the voiceband range to 48 kHz in the audio range. The AD74111 is available in a 16-lead TSSOP package
option and is specified for the automotive temperature range of 40 C to +105 C.

FUNCTIONAL BLOCK DIAGRAM
RESET MCLK DVDD1 DVDD2 AVDD

ADC DIN DOUT DFS DCLK SERIAL DATA PORT DIGITAL FILTER MODULATOR GAIN STAGE

CAPP VIN CAPN

DAC CHANNEL REFERENCE DIGITAL FILTER VOLUME CONTROL - DAC MODULATOR VOUT

REFCAP

DGND

AGND

REV. 0
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