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What is AD1939?

This electronic component, produced by the manufacturer "Analog Devices", performs the same function as "4 ADC/8 DAC".


AD1939 Datasheet PDF - Analog Devices

Part Number AD1939
Description 4 ADC/8 DAC
Manufacturers Analog Devices 
Logo Analog Devices Logo 


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4 ADC/8 DAC with PLL,
192 kHz, 24-Bit CODEC
AD1939
FEATURES
PLL generated or direct master clock
Low EMI design
112 dB DAC/107 dB ADC dynamic range and SNR
−94 dB THD + N
Single 3.3 V supply
Tolerance for 5 V logic inputs
Supports 24-bits and 8 kHz to 192 kHz sample rates
Differential ADC input
Differential DAC output
Log volume control with autoramp function
SPI® controllable for flexibility
Software controllable clickless mute
Software power-down
Right-justified, left-justified, I2S, and TDM modes
Master and slave modes up to 16-channel in/out
64-lead LQFP package
APPLICATIONS
Automotive audio systems
Home Theater Systems
Set-top boxes
Digital audio effects processors
GENERAL DESCRIPTION
The AD1939 is a high performance, single-chip codec that
provides four analog-to-digital converters (ADCs) with
differential input and eight digital-to-analog converters (DACs)
with differential output using the Analog Devices, Inc. patented
multibit sigma-delta (Σ-Δ) architecture. An SPI port is included,
allowing a microcontroller to adjust volume and many other
parameters. The AD1939 operates from 3.3 V digital and analog
supplies. The AD1939 is available in a 64-lead (differential
output) LQFP package.
The AD1939 is designed for low EMI. This consideration is
apparent in both the system and circuit design architectures.
By using the on-board PLL to derive the master clock from the
LR clock or from an external crystal, the AD1939 eliminates
the need for a separate high frequency master clock and can
also be used with a suppressed bit clock. The digital-to-analog
and analog-to-digital converters are designed using the latest
ADI continuous time architectures to further minimize EMI.
By using 3.3 V supplies, power consumption is minimized,
further reducing emissions.
FUNCTIONAL BLOCK DIAGRAM
DIGITAL AUDIO
INPUT/OUTPUT
ANALOG
AUDIO
INPUTS
AD1939
SERIAL DATA PORT
ADC
ADC
ADC
ADC
DIGITAL
FILTER
SDATA
OUT
SDATA
IN
CLOCKS
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
DIGITAL
FILTER
AND
VOLUME
CONTROL
PRECISION
VOLTAGE
REFERENCE
CONTROL PORT
SPI/I2C
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
ANALOG
AUDIO
OUTPUTS
CONTROL DATA
INPUT/OUTPUT
Figure 1.
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.

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AD1939 equivalent
DIGITAL INPUT/OUTPUT SPECIFICATIONS
−40°C < TA < +130°C, DVDD = 3.3 V ± 10%.
Table 4.
Parameter
Input Voltage HI (VIH)
Input Voltage HI (VIH)
Input Voltage LO (VIL)
Input Leakage
High Level Output Voltage (VOH)
Low Level Output Voltage (VOL)
Input Capacitance
POWER SUPPLY SPECIFICATIONS
Table 5.
Parameter
SUPPLIES
Voltage
Digital Current
Normal Operation
Power-Down
Analog Current
Normal Operation
Power-Down
DISSIPATION
Operation
All Supplies
Digital Supply
Analog Supply
Power-Down, All Supplies
POWER SUPPLY REJECTION RATIO
Signal at Analog Supply Pins
AD1939
Conditions/Comments
MCLKI/XI pin
IIH @ VIH = 2.4 V
IIL @ VIL = 0.8 V
IOH = 1 mA
IOL = 1 mA
Min Typ Max Unit
2.0 V
2.2 V
0.8 V
10 μA
10 μA
DVDD − 0.60
V
0.4 V
5 pF
Conditions/Comments
Min
DVDD
AVDD
MCLK = 256 fS
fS = 48 kHz
fS = 96 kHz
fS = 192 kHz
fS = 48 kHz to 192 kHz
3.0
3.0
MCLK = 256 fS, 48 kHz
1 kHz 200 mV p-p
20 kHz 200 mV p-p
Typ Max Unit
3.3 3.6
3.3 3.6
56
65
95
2.0
74
23
V
V
mA
mA
mA
mA
mA
mA
429 mW
185 mW
244 mW
83 mW
50 dB
50 dB
Rev. 0 | Page 5 of 32


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