Datasheet AD74111 (Analog Devices)

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 Software Controllable Clickless Mute
An on-chip reference voltage is included but can be powered
Supports 256 f
down and bypassed by an external reference source if required.
S, 512 fS, and 768 fS Master Mode 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
APPLICATIONS
and is specified for the automotive temperature range of –40°C
Digital Video Camcorders (DVC)
to +105°C.
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 FILTER MODULATOR STAGE VIN DOUT SERIAL CAPN DATA DFS PORT DCLK DAC CHANNEL DIGITAL VOLUME REFERENCE - DAC FILTER CONTROL VOUT MODULATOR REFCAP DGND AGND
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Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS TEMPERATURE RANGE ORDERING GUIDE PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics FUNCTIONAL DESCRIPTION General Description ADC Section ADC, CAPP, and CAPN Pins Peak Readback Decimator Section Input Signal Swing DAC Section Output Signal Swing Low Group Delay Reference Master Clocking Scheme Selecting Sample Rates Resetting the AD74111 Power Supplies and Grounds Accessing the Internal Registers Serial Port Serial Port Operating Modes Mixed Mode Data Mode Data-Word Length Selecting Master or Slave Mode Master Mode Operation Slave Mode Operation OUTLINE DIMENSIONS