a
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 鈥淧erfect Differential
Linearity Restoration鈥?for Reduced Idle Tones and
Noise Floor
Data Directed Scrambling DAC鈥擫east Sensitive to Jitter
Differential Output for Optimum Performance
113 dB Dynamic Range at 48 kHz Sample Rate
(AD1854KRS)
112 dB Signal-to-Noise at 48 kHz Sample Rate
(AD1854KRS)
鈥?01 THD+N (AD1854KRS)
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 256 F
S
or 384 F
S
Master Mode Clock
Switchable Clock Doubler
Power-Down Mode Plus Soft Power-Down Mode
Flexible Serial Data Port with Right-Justified, Left-
Justified, and I
2
S-Compatible
28-Lead SSOP Plastic Package
APPLICATIONS
DVD, CD, Set-Top Boxes, Home Theater Systems,
Automotive Audio Systems, Sampling Musical
Keyboards, Digital Mixing Consoles, Digital Audio
Effects Processors
Stereo, 96 kHz, Multibit
DAC
AD1854
PRODUCT OVERVIEW
The AD1854 is a high performance, single-chip stereo, audio
DAC delivering 113 dB Dynamic Range and 112 dB SNR
(A-weighted鈥攏ot 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 AD1854
is fully compatible with current DVD formats, including 96 kHz
sample frequency and 24 bits. It is also backwards compatible
by supporting 50
碌s/15 碌s
digital de-emphasis intended for
鈥渞edbook鈥?44.1 kHz sample frequency playback from com-
pact discs.
The AD1854 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 AD1854 can be configured in left-justified, I
2
S, and right-
justified. The AD1854 accepts 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 AD1854
operates from a single 5 V power supply. It is fabricated on a single
monolithic integrated circuit and housed in a 28-lead SSOP
package for operation over the temperature range 0擄C to 70擄C.
FUNCTIONAL BLOCK DIAGRAM
CONTROL DATA
INPUT
3
DIGITAL CLOCK 96/48F
S
SUPPLY
IN
CLOCK
2
VOLUME
MUTE
AD1854
8 F
S
INTERPOLATOR
8 F
S
INTERPOLATOR
SERIAL CONTROL
INTERFACE
VOLTAGE
REFERENCE
CLOCK
CIRCUIT
16-/18-/20-/24-BIT
DIGITAL
DATA INPUT
SERIAL 2
MODE
SERIAL
DATA
INTERFACE
ATTEN/
MUTE
ATTEN/
MUTE
MULTIBIT SIGMA-
DELTA MODULATOR
MULTIBIT SIGMA-
DELTA MODULATOR
DAC
OUTPUT
BUFFER
OUTPUT
BUFFER
ANALOG
OUTPUTS
DAC
2
PD/RST
MUTE
DE-EMPHASIS
ANALOG
SUPPLY
2
ZERO
FLAG
REV. A
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
漏 Analog Devices, Inc., 2000
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