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Analog Devices Semiconductor Electronic Components Datasheet

AD1955 Datasheet

High Performance Multibit DAC

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a
High Performance Multibit -DAC
with SACD Playback
AD1955
FEATURES
5 V Power Supply Stereo Audio DAC System
Accepts 16-/18-/20-/24-Bit Data
Supports 24-Bit, 192 kHz Sample Rate PCM Audio Data
Supports SACD Bit Stream and External Digital Filter
Interface
Accepts a Wide Range of PCM Sample Rates Including:
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, and
192 kHz
Multibit Sigma-Delta Modulator with "Perfect Differen-
tial Linearity Restoration" for Reduced Idle Tones and
Noise Floor
Data Directed Scrambling DAC––Low Sensitivity to Jitter
Supports SACD Playback with "Bit Expansion" Filter
Differential Current Output for Optimum Performance
8.64 mA p-p Differential Output
120 dB SNR/DNR (not muted) at 48 kHz Sample Rate
(A-Weighted Stereo)
123 dB SNR/DNR (Mono)
110 dB THD + N
110 dB Stop-Band Attenuation with ؎0.0002 dB
Pass-Band Ripple
8؋ Oversampling Digital Filter
On-Chip Clickless Volume Control
Supports SACD-Mute Pattern Detection
Supports 64 fS/128 fS DSD SACD with Phase Mode
Internal Digital Filter Pass-Through for External Filter
Master Clock: 256 fS, 512 fS, 768 fS
Hardware and Software Controllable Clickless Mute
Serial (SPI) Control for Serial Mode, Number of Bits,
Sample Rate, Volume, Mute, De-Emphasis, Mono Mode
Digital De-Emphasis for 32 kHz, 44.1 kHz, and 48 kHz
Sample Rates
Flexible Serial Data Port with Right-Justified, Left-
Justified, I2S, and DSP Modes
28-Lead SSOP Plastic Package
APPLICATIONS
High End DVD Audio
SACD
CD
Home Theater Systems
Automotive Audio Systems
Sampling Musical Keyboards
Digital Mixing Consoles
Digital Audio Effects Processors
FUNCTIONAL BLOCK DIAGRAM
MASTER
CLOCK INPUT
CONTROL
DATA INPUT
3
DSD
BITSTREAM
INPUT
4
16-/20-/24-BIT
AUDIO DATA/
EXTERNAL
DIGITAL
FILTER INPUT
AUTO-CLOCK
DIVIDER
SPI CONTROL
3/4
MUX
DSD FILTER
SERIAL DATA
INTERFACE
EXTERNAL
FILTER I/F
DIGITAL
SUPPLY
RESET
DIGITAL
FILTER ENGINE
S/H
NOISE-SHAPED
SCRAMBLING
MULTIBIT -
MODULATOR
MUTE
ANALOG
SUPPLY
ZERO
FLAGS
I-DAC
I-DAC
VOLTAGE
REFERENCE
L-CH
R-CH
DIFFERENTIAL
CURRENT OUTPUT
PRODUCT OVERVIEW
The AD1955 is a complete, high performance, single-chip, stereo
digital audio playback system. It is comprised of a multibit sigma-
delta modulator, high performance digital interpolation filters,
and continuous-time differential current output DACs. Other
features include an on-chip clickless stereo attenuator and mute
capability, programmed through an SPI compatible serial control
port. The AD1955 is fully compatible with all known DVD audio
formats including 192 kHz as well as 96 kHz sample frequencies
and 24 bits. It is also backward compatible by supporting 50 µs/
15 µs digital de-emphasis intended for redbookcompact discs,
as well as de-emphasis at 32 kHz and 48 kHz sample rates.
The AD1955 has a very flexible serial data input port that
allows for glueless interconnection to a variety of ADCs, DSPs,
SACD decoders, external digital filters, AES/EBU receivers, and
(continued on page 12)
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.
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
© Analog Devices, Inc., 2002


Analog Devices Semiconductor Electronic Components Datasheet

AD1955 Datasheet

High Performance Multibit DAC

No Preview Available !

AD1955–SPECIFICATIONS
TEST CONDITIONS
(Unless otherwise noted.)
Analog Supply Voltages (AVDD) . . . . . . . . . . . . . . . . . . . . 5 V
Digital Supply Voltages (DVDD) . . . . . . . . . . . . . . . . . . . . 5 V
Reference Current (IREF) . . . . . . . . . . . . . . . . . . . . . 0.960 mA
Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 25°C
Input Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.288 MHz
Input Signal . . . . . . . . . . . . . . . . . 984.375 Hz, 0 dB Full Scale
Input Sample Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 kHz
Measurement Bandwidth . . . . . . . . . . . . . . . . 20 Hz to 20 kHz
Word Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Bits
Load Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 pF
Load Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 k
Input Voltage HI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 V
Input Voltage LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 V
ANALOG PERFORMANCE (See figures. IREF = 0.960 mA, VBIAS = 2.80 V.)
Parameter
Min Typ Max
Unit
Resolution
24 Bits
SIGNAL-TO-NOISE RATIO (20 Hz to 20 kHz)*
Differential Output (A-Weighted, RMS) (Stereo)
Differential Output (A-Weighted, RMS) (Mono)
Single-Ended (A-Weighted, RMS) (Stereo)
120 114
123
119
dB
dB
dB
DYNAMIC RANGE (20 Hz to 20 kHz, 60 dB Input)*
Differential Output (A-Weighted, RMS) (Stereo)
Differential Output (A-Weighted, RMS) (Mono)
Single-Ended (A-Weighted, RMS) (Stereo)
120 114
123
119
dB
dB
dB
Total Harmonic Distortion + Noise (Stereo) at 0 dBFS
110
102.5
dB
ANALOG OUTPUTS
Differential Output Range (Full Scale)
Output Capacitance at Each Output Pin
Output Bias Current, Each Output
8.64
3.24
100
mA p-p
pF
mA
Out-of-Band Energy (0.5 ϫ fS to 100 kHz)
Reference Voltage
2.245
2.39
90
2.505
dB
V
DC ACCURACY
Gain Error
Interchannel Gain Mismatch
Gain Drift
±6
0.01 0.26
25
%
dB
ppm/°C
Interchannel Crosstalk (EIAJ Method)
Interchannel Phase Deviation
Mute Attenuation
De-Emphasis Gain Error
125
± 0.1
100
± 0.1
dB
Degrees
dB
dB
*Measured with Audio Precision System Two Cascade in RMS Mode. Averaging Mode will show approximately 2 dB better performance.
Performance of right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications).
Specifications subject to change without notice.
–2– REV. 0


Part Number AD1955
Description High Performance Multibit DAC
Maker Analog Devices
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AD1955 Datasheet PDF






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