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Analog Devices Semiconductor Electronic Components Datasheet

AD1928 Datasheet

2 ADC/8 DAC

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AD1928 pdf
FEATURES
PLL-generated or direct master clock
Low EMI design
108 dB DAC/107 dB ADC dynamic range and SNR
−94 dB THD + N
3.3 V single supply
Tolerance for 5 V logic inputs
Supports 24 bits and 8 kHz to 192 kHz sample rates
Differential ADC input
Single-ended DAC output
Log volume control with autoramp function
SPI® controllable for flexibility
Software-controllable clickless mute
Software power-down
Right-justified, left-justified, I2S-justified, and TDM modes
Master and slave modes up to 16-channel input/output
48-lead LQFP
APPLICATIONS
Automotive audio systems
Home theater systems
www.DataSheet4U.com Set-top boxes
Digital audio effects processors
2 ADC/8 DAC with PLL,
192 kHz, 24-Bit Codec
AD1928
GENERAL DESCRIPTION
The AD1928 is a high performance, single-chip codec that
provides two analog-to-digital converters (ADCs) with differ-
ential input and eight digital-to-analog converters (DACs) with
single-ended 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 AD1928 operates from 3.3 V digital and analog
supplies. The AD1928 is available in a 48-lead (single-ended
output) LQFP package. Other members of this family include a
differential DAC output and I2C® control port versions.
The AD1928 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 AD1928 eliminates the
need for a separate high frequency master clock and can be
used with a suppressed bit clock. The digital-to-analog and
analog-to-digital converters are designed using the latest
Analog Devices 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
AD1928
SERIAL DATA PORT
ADC
ADC
QUAD
DEC
FILTER
48kHz/
96kHz/
192kHz
SDATA
OUT
SDATA
IN
CLOCKS
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
DIGITAL
FILTER
AND
VOLUME
CONTROL
PRECISION
VOLTAGE
REFERENCE
CONTROL PORT
SPI/I2C
CONTROL DATA
INPUT/OUTPUT
Figure 1.
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
ANALOG
AUDIO
OUTPUTS
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
©2007 Analog Devices, Inc. All rights reserved.



Analog Devices Semiconductor Electronic Components Datasheet

AD1928 Datasheet

2 ADC/8 DAC

No Preview Available !

AD1928 pdf
AD1928
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Test Conditions............................................................................. 3
Analog Performance Specifications ........................................... 3
Crystal Oscillator Specifications................................................. 5
Digital Input/Output Specifications........................................... 5
Power Supply Specifications........................................................ 5
Digital Filters................................................................................. 6
Timing Specifications .................................................................. 6
Absolute Maximum Ratings............................................................ 8
Thermal Resistance ...................................................................... 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 13
REVISION HISTORY
4/07—Revision 0: Initial Version
Analog-to-Digital Converters (ADCs).................................... 13
Digital-to-Analog Converters (DACs) .................................... 13
Clock Signals............................................................................... 13
Reset and Power-Down ............................................................. 14
Serial Control Port ..................................................................... 14
Power Supply and Voltage Reference....................................... 15
Serial Data Ports—Data Format............................................... 15
Time-Division Multiplexed (TDM) Modes............................ 15
Daisy-Chain Mode ..................................................................... 19
Control Registers ............................................................................ 24
Definitions................................................................................... 24
PLL and Clock Control Registers............................................. 24
DAC Control Registers .............................................................. 25
ADC Control Registers.............................................................. 27
Additional Modes....................................................................... 29
Application Circuits ....................................................................... 30
Outline Dimensions ....................................................................... 31
Ordering Guide .......................................................................... 31
Rev. 0 | Page 2 of 32



Analog Devices Semiconductor Electronic Components Datasheet

AD1928 Datasheet

2 ADC/8 DAC

No Preview Available !

AD1928 pdf
AD1928
SPECIFICATIONS
TEST CONDITIONS
Performance of all channels is identical, exclusive of the interchannel gain mismatch and interchannel phase deviation specifications.
Supply voltages (AVDD, DVDD)
Temperature range1
Master clock
Input sample rate
Measurement bandwidth
Word width
Load capacitance (digital output)
Load current (digital output)
High level input voltage
Low level input voltage
3.3 V
As specified in Table 1 and Table 2
12.288 MHz (48 kHz fS, 256 × fS mode)
48 kHz
20 Hz to 20 kHz
24 bits
20 pF
±1 mA or 1.5 kΩ to ½ DVDD supply
2.0 V
0.8 V
1 Functionally guaranteed at −40°C to +125°C case temperature.
ANALOG PERFORMANCE SPECIFICATIONS
Specifications guaranteed at an ambient temperature of 25°C.
Table 1.
Parameter
ANALOG-TO-DIGITAL CONVERTERS
ADC Resolution
Dynamic Range
No Filter (RMS)
With A-Weighted Filter (RMS)
Total Harmonic Distortion + Noise
Full-Scale Input Voltage (Differential)
Gain Error
Interchannel Gain Mismatch
Offset Error
Gain Drift
Interchannel Isolation
CMRR
Input Resistance
Input Capacitance
Input Common-Mode Bias Voltage
DIGITAL-TO-ANALOG CONVERTERS
Dynamic Range
No Filter (RMS)
With A-Weighted Filter (RMS)
With A-Weighted Filter (Average)
Total Harmonic Distortion + Noise
Single-Ended Version
Full-Scale Output Voltage
Gain Error
Interchannel Gain Mismatch
Offset Error
Gain Drift
Conditions
All ADCs
20 Hz to 20 kHz, −60 dB input
−1 dBFS
100 mV rms, 1 kHz
100 mV rms, 20 kHz
20 Hz to 20 kHz, −60 dB input
0 dBFS
Two channels running
Eight channels running
Min Typ
24
98
100
−10
−0.25
−10
102
105
−96
1.9
0
100
−110
55
55
14
10
1.5
Max Unit
Bits
−87
+10
+0.25
+10
dB
dB
dB
V rms
%
dB
mV
ppm/°C
dB
dB
dB
pF
V
98 104
100 106
108
dB
dB
dB
−92 dB
−86 −75 dB
0.88 (2.48)
V rms (V p-p)
−10 +10 %
−0.2 +0.2 dB
−25 −4
+25 mV
−30 +30 ppm/°C
Rev. 0 | Page 3 of 32




Part Number AD1928
Description 2 ADC/8 DAC
Maker Analog Devices
Total Page 30 Pages
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