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Analog Devices Semiconductor Electronic Components Datasheet



AD1857

Stereo/ Single Supply 16-/ 18- and 20-Bit Sigma-Delta DACs


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AD1857 pdf
a
Stereo, Single Supply
16-, 18- and 20-Bit Sigma-Delta DACs
AD1857/AD1858
FEATURES
Low Cost, High Performance Stereo DACs
128 Times Oversampling Interpolation Filter
Multibit ⌺⌬ Modulator with Triangular PDF Dither
Discrete Time and Continuous Time Analog
Reconstruction Filters
Extremely Low Out-of-Band Energy
Buffered Outputs with 2 kOutput Load Drive
94 dB Dynamic Range, –90 dB THD+N Performance
Digital De-emphasis and Mute
؎0.1؇C Maximum Phase Linearity Deviation
Continuously Variable Sample Rate Support
Power-Down Mode
16-, 18- and 20-Bit I2S-Justified, Left-Justified Modes
Offered on AD1857
Accepts 24-Bit Word
16-Bit Right-Justified and DSP Serial Port Modes
Offered on AD1858
Single +5 V Supply
20-Pin SSOP Package
APPLICATIONS
Digital Cable TV and Direct Broadcast Satellite Set-Top
Decoder Boxes
Video Laser Disk, Video CD and CD-I Players
High Definition Televisions, Digital Audio Broadcast
Receivers
CD, CD-R, DAT, DCC and MD Players
Digital Audio Workstations, Computer Multimedia
Products
PRODUCT OVERVIEW
The AD1857/AD1858 are complete single-chip stereo digital
audio playback components. They each comprise an advanced
digital interpolation filter, a revolutionary “linearity-compensated”
multibit sigma-delta (∑∆) modulator with dither, a jitter-tolerant
DAC, switched capacitor and continuous time analog filters and
analog output drive circuitry. Other features include digital
de-emphasis processing and mute. The AD1857/AD1858
support continuously variable sample rates with essentially
linear phase response, and support 50/15 µs digital de-emphasis
intended for “Redbook” 44.1 kHz sample frequency playback
from Compact Discs. The user must provide a master clock that
is synchronous with the left/right clock at 256 or 384 times the
intended sample frequency.
The AD1857/AD1858 have a 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 con-
verters. The AD1857 serial data input port can be configured
in either 16-bit, 18-bit or 20-bit left-justified or I2S-justified
modes. The AD1858 serial data input port can be configured in
either 16-bit right-justified or DSP serial port compatible modes.
The AD1857/AD1858 accept serial audio data in MSB first,
twos-complement format. A power-down mode is offered to
minimize power consumption when the device is inactive. The
AD1857/AD1858 operate from a single +5 V power supply.
They are fabricated on a single monolithic integrated circuit and
housed in 20-pin SSOP packages for operation over the
temperature range 0°C to +70°C.
DIGITAL
SUPPLY
2
FUNCTIONAL BLOCK DIAGRAM
COMMON
MODE
CLOCK CLOCK
MODE
IN
16-/18-/20-BIT
DIGITAL 3
DATA INPUT
SERIAL DATA
INTERFACE
AD1857/AD1858
VOLTAGE
REFERENCE
CLOCK
CIRCUIT
SERIAL
MODE
128x
INTERPOLATION
FILTER
128x
INTERPOLATION
FILTER
MUTE
MUTE
MULTIBIT
Σ∆ MODULATOR
MULTIBIT
Σ∆ MODULATOR
DAC
DAC
ANALOG
FILTER
ANALOG
FILTER
OUTPUT
BUFFER
OUTPUT
BUFFER
ANALOG
OUTPUTS
DE-EMPHASIS
MUTE
POWER-DOWN/RESET
4
ANALOG
SUPPLY
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
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: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997



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AD1857 pdf
AD1857/AD1858–SPECIFICATIONS
TEST CONDITIONS UNLESS OTHERWISE NOTED
Supply Voltages (AVDD, DVDD)
Ambient Temperature
Input Clock (FMCLK)
Input Signal
+5.0 V
25°C
11.2896 MHz (256 × FS Mode)
1.0013 kHz
–0.5 dB Full Scale
Input Sample Rate
44.1 kHz
Measurement Bandwidth
20 Hz to 20 kHz
AD1857 Input Data Wordwidth
18 Bits
AD1858 Input Data Wordwidth
16 Bits
Load Capacitance
100 pF
Load Impedance
47 k
Input Voltage HI (VIH)
Input Voltage LO (VIL)
2.4 V
0.8 V
I2S-Justified Mode (Ref. Figure 7) for AD1857, Right-Justified Mode (Ref. Figure 8) for AD1858.
Performance of the right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications).
Values in bold typeface are tested, all others are guaranteed, not tested.
ANALOG PERFORMANCE
Min Typ Max
AD1857 Resolution
AD1858 Resolution
Dynamic Range (20 Hz to 20 kHz, –60 dB Input)
No A-Weight Filter
With A-Weight Filter
Total Harmonic Distortion + Noise
Analog Outputs
Single-Ended 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
18
16
91
94
–90
0.003
–85
0.006
2.8 3.0 3.2
<200
20
–72.5
2.1 2.25 2.4
± 3.0
0.01
150
–120
± 0.1
–100
؎7.5
؎0.2
300
–100
–90
± 0.1
Units
Bits
Bits
dB
dB
dB
%
V p-p
pF
dB
V
%
dB
ppm/°C
dB
Degrees
dB
dB
DIGITAL I/O
Input Voltage HI (VIH)
Input Voltage LO (VIL)
Input Leakage (IIH @ VIH = 2.4 V)
Input Leakage (IIL @ VIL = 0.8 V)
Input Capacitance
Min Max Units
2.4 V
0.8 V
10 µA
10 µA
20 pF
–2– REV. 0



Part Number AD1857
Description Stereo/ Single Supply 16-/ 18- and 20-Bit Sigma-Delta DACs
Maker Analog Devices - Analog Devices
Total Page 16 Pages
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