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AD74111
Low Cost, Low Power
Mono Audio Codec
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 f
S
, and 768 f
S
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
FUNCTIONAL BLOCK DIAGRAM
GAIN
STAGE
DIGITAL
FILTER
ADC
VIN
CAPP
CAPN
DVDD2 AVDDDVDD1
DAC CHANNEL
VOLUME
CONTROL
DIGITAL
FILTER
VOUT
AGND
REFCAP
DIN
DOUT
DFS
DCLK
DGND
MCLK
RESET
-
DAC
MODULATOR
-
MODULATOR
SERIAL
DATA
PORT
REFERENCE
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 pro-
vides >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.
