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Analog Devices Semiconductor Electronic Components Datasheet

AD74111 Datasheet

Low Power Mono Audio Codec

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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 ؋ fS, 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 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.
RESET
FUNCTIONAL BLOCK DIAGRAM
MCLK DVDD1 DVDD2 AVDD
DIN
DOUT
DFS
DCLK
SERIAL
DATA
PORT
DIGITAL
FILTER
ADC
-
MODULATOR
GAIN
STAGE
CAPP
VIN
CAPN
REFERENCE
DIGITAL
FILTER
DAC CHANNEL
VOLUME
CONTROL
-DAC
MODULATOR
VOUT
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
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD74111 Datasheet

Low Power Mono Audio Codec

No Preview Available !

AD74111–SPECIFICATIONS (AVDD = 2.5 V ± 5%, DVDD2 = 2.5 V ± 5%, DVDD1 = 2.5 V ± 5%w,wfMwC.LDK a=ta1Sh2e.2et848U.McoHmz,
fS = 48 kHz, TA = TMIN to TMAX, unless otherwise noted.)
Parameter
ANALOG-TO-DIGITAL CONVERTERS
ADC Resolution
Signal to Noise Ratio (SNR)
Dynamic Range
(20 Hz to 20 kHz, –60 dB Input)
No Filter
With A-Weighted Filter
Total Harmonic Distortion + Noise
Programmable Input Gain
Gain Step Size
Offset Error
Full-Scale Input Voltage
Input Resistance
Input Capacitance
Common-Mode Input Volts
Crosstalk
DIGITAL-TO-ANALOG CONVERTERS
DAC Resolution
Signal to Noise Ratio (SNR)
Dynamic Range
(20 Hz to 20 kHz, –60 dB Input)
No Filter
With A-Weighted Filter
Total Harmonic Distortion + Noise
DC Accuracy
Offset Error
Gain Error
Volume Control Step Size
(1024 Linear Steps)
Volume Control Range (Max Attenuation)
Mute Attenuation
De-emphasis Gain Error
Full-Scale Output Voltage
Output Resistance
Common Mode Output Volts
Crosstalk
REFERENCE (Internal)
Absolute Voltage, VREF
VREF TC
Conditions
Min
fS = 16 kHz
fS = 48 kHz
fS = 16 kHz
fS = 48 kHz
fS = 48 kHz, PGA = 0 dB
fS = 16 kHz
70
78
–55
ADC Input Signal = 1.0 kHz,
0 dB; DAC Output = DC
fS = 16 kHz
fS = 48 kHz
fS = 16 kHz
fS = 48 kHz
fS = 48 kHz
fS = 16 kHz
80
84
–75
–0.9
Signal Input ADC = AGND;
DAC Output
Level = 1.0 kHz, 0 dB
Typ Max Unit
24 Bits
77 dB
85 dB
85 dB
87 dB
–67 dB
–75 dB
12 dB
3 dB
+30 +80 mV
0.5 V rms
4 k
15 pF
1.125
V
100 dB
24 Bits
89 dB
93
93
95
–88
–88 –81
–10
+0.175
0.098
–60
–100
± 0.1
0.5
145
1.125
95
+50
+0.8
dB
dB
dB
dB
dB
dB
mV
dB
%
dB
dB
dB
V rms
V
dB
1.125
50
V
ppm/°C
–2– REV. 0


Part Number AD74111
Description Low Power Mono Audio Codec
Maker Analog Devices
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