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.

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 256fS, 512fS, and 768fS 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

(AVDD = 2.5 V ±5%, DVDD2 = 2.5 V ±5%, DVDD1 = 2.5 V ±5%, fMCLK= 12.288 MHz,fS= 48 kHz, TA= TMIN to TMAX, unless otherwise noted.)