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Analog Devices Semiconductor Electronic Components Datasheet



AD1854

Stereo/ 96 kHz/ Multibit DAC



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AD1854 pdf
a
Stereo, 96 kHz, Multibit ⌺⌬ DAC
AD1854
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 Differential
Linearity Restoration” for Reduced Idle Tones and
Noise Floor
Data Directed Scrambling DAC—Least 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)
101 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 ؋ FS or 384 ؋ FS Master Mode Clock
Switchable Clock Doubler
Power-Down Mode Plus Soft Power-Down Mode
Flexible Serial Data Port with Right-Justified, Left-
Justified, and I2S-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
PRODUCT OVERVIEW
The AD1854 is a high performance, single-chip stereo, audio
DAC delivering 113 dB Dynamic Range and 112 dB 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 AD1854
is fully compatible with current DVD formats, including 96 kHz
sample frequency and 24 bits. It is also backwards compatible
by supporting 50 µs/15 µs digital de-emphasis intended for
“redbook” 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, I2S, 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°C to 70°C.
FUNCTIONAL BLOCK DIAGRAM
CONTROL DATA
VOLUME INPUT
MUTE
3
DIGITAL CLOCK 96/48FS
SUPPLY IN CLOCK
2
AD1854
SERIAL CONTROL VOLTAGE
INTERFACE
REFERENCE
16-/18-/20-/24-BIT
DIGITAL
DATA INPUT
SERIAL 2
MODE
SERIAL
DATA
INTERFACE
ATTEN/
MUTE
ATTEN/
MUTE
PD /RST
8 ؋ FS
INTERPOLATOR
8 ؋ FS
INTERPOLATOR
MUTE
MULTIBIT SIGMA-
DELTA MODULATOR
MULTIBIT SIGMA-
DELTA MODULATOR
DAC
DAC
DE-EMPHASIS
2
ANALOG
SUPPLY
CLOCK
CIRCUIT
OUTPUT
BUFFER
OUTPUT
BUFFER
2
ZERO
FLAG
ANALOG
OUTPUTS
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
© Analog Devices, Inc., 2000



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AD1854 pdf
AD1854–SPECIFICATIONS
TEST CONDITIONS UNLESS OTHERWISE NOTED
Supply Voltages (AVDD, DVDD)
Ambient Temperature
5.0 V
25°C
Input Clock
Input Signal
12.288 MHz (256 × 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 Capacitance
100 pF
Load Impedance
47 k
Input Voltage HI
2.4 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
Signal-to-Noise Ratio (20 Hz to 20 kHz)
No Filter (AD1854JRS)
No Filter (AD1854KRS)
With A-Weighted Filter (AD1854JRS)
With A-Weighted Filter (AD1854KRS)
Dynamic Range (20 Hz to 20 kHz, –60 dB Input)
No Filter (AD1854JRS)
No Filter (AD1854KRS)
With A-Weighted Filter (AD1854JRS)
With A-Weighted Filter (AD1854KRS)
Total Harmonic Distortion + Noise (AD1854JRS) VO = 0 dB
Total Harmonic Distortion + Noise (AD1854KRS) VO = 0 dB
Total Harmonic Distortion + Noise (AD1854JRS and
AD1854KRS) VO = –20 dB
Total Harmonic Distortion + Noise (AD1854JRS and
AD1854KRS) VO = –60 dB
Analog Outputs
Differential Output Range (± Full Scale)
Output Impedance at Each Output Pin
Output Capacitance at Each Output Pin
Out-of-Band Energy (0.5 × FS to 100 kHz)
CMOUT
DC Accuracy
Gain Error
Interchannel Gain Mismatch
Gain Drift
Interchannel Crosstalk (EIAJ Method)
Interchannel Phase Deviation
Mute Attenuation
De-Emphasis Gain Error
DIGITAL I/O (0؇C to 70؇C)
Input Voltage HI (VIH)
Input Voltage LO (VIL)
High Level Output Voltage (VOH) IOH = 1 mA
Low Level Output Voltage (VOL) IOL = 1 mA
Input Leakage (IIH @ VIH = 2.4 V)
Input Leakage (IIL @ VIL = 0.8 V)
Input Capacitance
Min
106
108
–88
–94
–11.0
–0.15
Typ
20
105
110
108
112
105
110
108
113
–97
–101
–89
–49
5.6
<200
2.25
± 3.0
200
–120
± 0.1
–100
Min Typ
2.2
2.0
Max
20
–72.5
+11.0
+0.15
300
± 0.1
Max
0.8
0.4
10
10
20
Unit
Bits
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
V p-p
pF
dB
V
%
dB
ppm/°C
dB
Degrees
dB
dB
Unit
V
V
V
V
µA
µA
pF
–2– REV. A



Part Number AD1854
Description Stereo/ 96 kHz/ Multibit DAC
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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