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Analog Devices Semiconductor Electronic Components Datasheet

AD1855 Datasheet

Stereo/ 96 kHz/ Multibit DAC

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AD1855 pdf
a
Stereo, 96 kHz, Multibit ⌺⌬ DAC
AD1855*
FEATURES
5 V Stereo Audio DAC System
Accepts 16-/18-/20-/24-Bit Data
Supports 24 Bits and 96 kHz Sample Rate
Multibit Sigma-Delta Modulator with “Perfect Differen-
tial Linearity Restoration” for Reduced Idle Tones
and Noise Floor
Data Directed Scrambling DAC—Least Sensitive to
Jitter
Differential Output for Optimum Performance
113 dB Signal-to-Noise and Dynamic Range at 48 kHz
Sample Rate
110 dB Signal-to-Noise and Dynamic Range at 96 kHz
Sample Rate
–97 dB THD+N
On-Chip Volume Control with 1024 Steps
Hardware and Software Controllable Clickless Mute
Zero Input Flag Outputs for Left and Right Channels
Digital De-Emphasis Processing
Supports 128, 256, 384, and 512 ؋ FS Master Mode
Clock
Switchable Clock Doubler
Power-Down Mode Plus Soft Power-Down Mode
Flexible Serial Data Port with Right-Justified, Left-
Justified, I2S-Compatible and DSP Serial Port Modes
28-Lead SSOP Plastic Package
APPLICATIONS
DVD, CD, Set-Top Boxes, Home Theater Systems, Auto-
motive Audio Systems, Computer Multimedia Prod-
ucts, Sampling Musical Keyboards, Digital Mixing
Consoles, Digital Audio Effects Processors
PRODUCT OVERVIEW
The AD1855 is a high performance, single-chip stereo, audio
DAC delivering 113 dB Dynamic Range and SNR (A-weighted—
not muted) at 48 kHz sample rate. It is comprised of a multibit
sigma-delta modulator with dither, continuous time analog
filters and analog output drive circuitry. Other features include
an on-chip stereo attenuator and mute, programmed through an
SPI-compatible serial control port. The AD1855 is fully com-
patible with current DVD formats, including 96 kHz sample
frequency and 24 bits. It is also backwards compatible by sup-
porting 50 µs/15 µs digital de-emphasis intended for “redbook”
44.1 kHz sample frequency playback from compact discs.
The AD1855 has a very simple but very flexible serial data input
port that allows for glueless interconnection to a variety of ADCs,
DSP chips, AES/EBU receivers and sample rate converters.
The AD1855 can be configured in left-justified, I2S, right-
justified, or DSP serial port compatible modes. The AD1855
accepts 16-/18-/20-/24-bit serial audio data in MSB first, twos-
complement format. A power-down mode is offered to mini-
mize power consumption when the device is inactive. The
AD1855 operates from a single +5 V power supply. It is fabri-
cated on a single monolithic integrated circuit and housed in a
28-lead SSOP package for operation over the temperature range
0°C to +70°C.
FUNCTIONAL BLOCK DIAGRAM
CONTROL DATA
VOLUME INPUT
MUTE
3
DIGITAL
SUPPLY
CLOCK
IN
96/48FS
CLOCK
2
AD1855
SERIAL CONTROL VOLTAGE
INTERFACE
REFERENCE
CLOCK
CIRCUIT
384/ 256
X2MCLK
16-/18-/20-/24-BIT 3
DIGITAL
DATA INPUT
SERIAL 2
MODE
SERIAL
DATA
INTERFACE
ATTEN/
MUTE
ATTEN/
MUTE
PD /RST
8؋
INTERPOLATOR
8؋
INTERPOLATOR
MUTE
MULTIBIT SIGMA-
DELTA MODULATOR
MULTIBIT SIGMA-
DELTA MODULATOR
DAC
DAC
DE-EMPHASIS
2
ANALOG
SUPPLY
OUTPUT
BUFFER
OUTPUT
BUFFER
2
ZERO
FLAG
ANALOG
OUTPUTS
*Patents Pending.
REV. B
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
which 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 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000


Analog Devices Semiconductor Electronic Components Datasheet

AD1855 Datasheet

Stereo/ 96 kHz/ Multibit DAC

No Preview Available !

AD1855 pdf
AD1855–SPECIFICATIONS
TEST CONDITIONS UNLESS OTHERWISE NOTED
Supply Voltages (AVDD, DVDD)
Ambient Temperature
+5.0 V
+25°C
Input Clock
Input Signal
24.576 MHz (512 × FS Mode)
1.0013 kHz
–0.5 dB Full Scale
Input Sample Rate
48 kHz
Measurement Bandwidth
20 Hz to 20 kHz
Word Width
20 Bits
Load Impedance
6 k
Input Voltage HI
4.0 V
Input Voltage LO
0.8 V
Performance of right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications).
ANALOG PERFORMANCE
Resolution
Dynamic Range (20 Hz to 20 kHz, –60 dB Input)
No Filter
With A-Weighted Filter
Total Harmonic Distortion + Noise
Analog Outputs
Differential Output Range (± Full Scale)
Output Impedance at Each Output Pin
Output Capacitance at Each Output Pin
CMOUT
Gain Error
Interchannel Gain Mismatch
Gain Drift
Interchannel Crosstalk (EIAJ Method)
Interchannel Phase Deviation
Mute Attenuation
De-Emphasis Gain Error
Min
108
–5.0
–0.15
Typ
20
110
113
–97
0.0014
5.6
200
2.5
± 3.0
150
–120
± 0.1
–120
Max
–91
20
+5.0
+0.15
300
± 0.1
DIGITAL TIMING (Guaranteed over 0؇C to +70؇C, AVDD = DVDD = +5.0 V ؎ 10%)
Min
tDMP
tDMP
tDMP
tDML
tDMH
tDBH
tDBL
tDBP
tDLS
tDLH
tDDS
tDDH
tPDRP
MCLK Period (512 FS Mode)
MCLK Period (384 FS Mode)
MCLK Period (256 FS Mode)
MCLK LO Pulsewidth (All Mode)
MCLK HI Pulsewidth (All Mode)
BCLK HI Pulsewidth
BCLK LO Pulsewidth
BCLK Period
LRCLK Setup
LRCLK Hold (DSP Serial Port Mode Only)
SDATA Setup
SDATA Hold
PD/RST LO Pulsewidth
35
48
70
0.4 × tDMP
0.4 × tDMP
20
20
140
20
5
5
10
4 MCLK Periods
Max
Units
Bits
dB
dB
dB
%
V p-p
pF
V
%
dB
ppm/°C
dB
Degrees
dB
dB
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
–2– REV. B


Part Number AD1855
Description Stereo/ 96 kHz/ Multibit DAC
Maker Analog Devices
Total Page 15 Pages
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