Analog Devices AD1955YRSRL, AD1955YRS Datasheet
PRELIMINARY TECHNICAL DATA
r
I
C I
C
r
a High Performance Multibit Σ∆
Σ∆ DAC
Σ∆Σ∆
with SACD Playback
Preliminary Technical Data AD1955
FEATURES
5V Power Supply Stereo Audio DAC System.
Accepts 16/18/20/24-Bit Data
Supports 24-Bits, 192kHz Sample Rate PCM Audio Data
Supports SACD bit-stream and External Digital Filter Interface
Accepts a Wide Range of PCM Sample Rates Including:
32kHz, 44.1kHz. 48kHz, 88.2kHz, 96kHz, and 192kHz
Multibit Sigma Delta Modulator with “Perfect Differential
Linearity Restoration” for Reduced Idle Tones and Noise Floor
Data Directed Scrambling DAC - Least Sensitive to Jitter
Supports SACD playback with “Bit Expansion” filter
Differential Current Output for Optimum Performance
8.64 mA p-p Output Current with +3dB headroom in SACD mode
120 dB SNR/DNR (not muted) at 48KHz Sample Rate
(A-Weighted Stereo)
123 dB SNR/DNR (Mono)
-110 dB THD+N
110 dB Stopband Attenuation with +/-0.0002dB Passband Ripple
8 Times Oversampling Digital Filter
On-chip Clickless Volume Control
Supports SACD-Mute pattern detection
Supports 64fs/128fs DSD SACD with phase modulation
Internal Digital Filter pass-through for External Filter
Master clock: 256fs,384fs,512fs,768fs
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, 44.1, 48 KHz Sample Rates
Flexible Serial Data Port with Right-Justified, Left-Justified,
2
I
S-Compatible and DSP Serial Port
28 Lead SSOP Plastic Package
APPLICATIONS
High-End DVD-Audio, SACD, CD, Home Theatre Systems, Automotive
Audio Systems, Sampling Musical Keyboards, Digital Mixing
Consoles, Digital Audio Effects Processors
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 continuoustime differential current output DAC section. Other features include an
on-chip clickless stereo attenuator, mute capability, programmed through
an SPI-compatible serial control port. The AD1955 is fully compatible
with all known DVD audio formats including 192kHz as well as 96kHz
sample frequencies and 24-bits. It also is backwards compatible by
supporting 50/15µs digital de-emphasis intended for “redbook” Compact
Discs, as well as de-emphasis at 32kHz and 48kHz sample rate.
The AD1955 has a very flexible serial data input port that allows for
glueless interconnection to a variety of ADCs, DSPs, SACD decoder,
external digital filter, AES/EBU receivers and sample rate converters.
The AD1955 can be configured in Left-justified, I
2
S, Right-Justified, or
DSP serial port compatible modes. It can support MSB first, twoscompliment format, 16, 18, 20 and 24 bits in all standard PCM modes.
Also the AD1955 has an interface for SACD playback and an external
digital filter interface for use with an external digital interpolation filter
or HDCD decoder. The AD1955 uses a +5 V power supply. It is
fabricated on a single monolithic integrated circuit and is housed in a 28pin SSOP package for operation over the temperature range -40
0
+105
C.
0
C to
FUNCTIONAL BLOCK DIAGRAM
16/20/24Bit
Audio Data /
External Digital
Filter Input
Bitstream
DSD
Input
3 / 4
4
Master Clock
Input
Auto-Clock
Divider
M
U
X
Serial Data
Interface
External
Filter I/F
DSD
Filte
Control Data
Input
SPI
Control
Digital
Filter
Engine
3
S/H
Multibit
Sigma-Delta
Modulato
Rev. PrF 3/18/2002
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 www.analog.com
Fax: 781/326-8703 ©Analog Devices, Inc., 2002
Digital
Supply
Noise-
Shaped
Scrambling
Analog
Supply
Voltage
Reference
-DA
-DA
ZERO FlagsMUTERESET
L-ch
Differential
Current Output
R-ch
PRELIMINARY TECHNICAL DATA
AD1955
TEST CONDITIONS UNLESS OTHERWISE NOTED
Analog Supply Voltages (AVDD) +5.0V
Digital Supply Voltages (DV
Reference Current (Iref) .960 mA
Ambient Temperature 25
Input Clock 12.288 MHz
Input Signal 996.11 Hz
0 dB Full Scale
Input Sample Rate 48 kHz
Measurement Bandwidth 20 Hz to 20KHz
Word Width 24 Bits
Load Capacitance 100 pF
Load Impedance 47 k ohms
Input Voltage HI 2.4 V
Input Voltage LO .8 V
ANALOG PERFORMANCE (See Figures ) Iref = .960 mA
Min Typ Max Units
Resolution
Signal-to-noise Ratio (20 Hz to 20kHz)
Differential Output (A-weighted, RMS) (Stereo) 120 dB
Differential Output (A-weighted, RMS) (Mono) 123 dB
Single-ended (Stereo) 119 dB
Dynamic Range (20 Hz to 20 kHz, -60 dB Input)
Differential Output (A-weighted, RMS) (Stereo) 120 dB
Differential Output (A-weighted, RMS) (Mono) 123 dB
Single-ended (Stereo) 119 dB
Total Harmonic Distortion + Noise (Stereo) at 0 dBFS -108 dB
Analog Outputs
Differential Output range (Full Scale) 8.64 mA p-p
Output Capacitance at Each Output Pin 100 pF
Output bias current, Each Output -3.24 mA
Out-of-Band Energy (0.5XFs to 100 kHz) -90 dB
Reference Voltage 2.39 V
DC Accuracy
Gain Error +/-3 %
Interchannel Gain Mismatch 0.01 dB
Gain Drift 25 ppm/OC
Interchannel Crosstalk (EIAJ method) -125 dB
Interchannel Phase Deviation +/- 0.1 Degrees
Mute Attenuation -100 dB
De-emphasis Gain Error +/- 0.1 dB
NOTES:
Performance of right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications).
DIGITAL I/O (-40oC to 105oC)
Min
Input Voltage HI (VIH) 2.0 V
Input Voltage LO (VIL) 0.8 V
Input Leakage (IIH@VIH=2.4 V) 10 uA
Input Leakage (IIL@VIL=0.8 V) 10 uA
High Level Output Voltage (VOH) IOH = 1 mA 2.4 V
Low Level Output Voltage (VOL) IOL = 1 mA 0.4 V
Input Capacitance 20 pF
Specifications subject to change without notice
) +5.0V
DD
O
C
Specifications subject to change without notice.
24
Typ
Max Units
Bits
-2- Rev. PrF
PRELIMINARY TECHNICAL DATA
AD1955
TEMPERATURE RANGE
Specifications Guaranteed 25
Functionality Guaranteed -40 105
Storage -55 125
Specifications subject to change without notice
POWER
Supplies
Voltage, Digital 4.50 5 5.50 V
Voltage, Analog 4.50 5 5.50 V
Analog Current 17 mA
Analog Current - Reset 17 mA
Digital Current 22 mA
Digital Current - Reset 2 mA
Dissipation
Operation - Both Supplies 195 mW
Operation - Analog Supply 85 mW
Operation - Digital Supply 110 mW
Power Supply Rejection Ratio
1kHz 300 mV p-p Signal at Analog Supply Pins -77 dB
20kHz 300 mV p-p Signal at Analog Supply Pins -72 dB
Specifications subject to change without notice
DIGITAL FILTER CHARACTERISTICS
Sample Rate (kHz) Passband (kHz) Stopband (kHz) Stopband Attenuation (dB) Passband Ripple (dB)
44.1 DC-20 24.1-328.7 110 +/- 0.0002
48 DC-21.8 26.23-358.28 110 +/- 0.0002
96 DC-39.95 56.9-327.65 115 +/- 0.0005
192 DC-87.2 117-327.65 95 +0/-0.04 (DC-21.8 kHz)
+0/-0.5 (DC-65.4 kHz)
+0/-1.5 (DC-87.2 kHz)
Specifications subject to change without notice
GROUP DELAY
Chip Mode
Group Delay Calculation Fs Group Delay Units
INT8x Mode 5553/(128 × FS) 48kHz 903.8
INT4x Mode 5601/(64 × FS) 96kHz 911.6
INT2x Mode 5659/(32 × FS) 192kHz 921
Specifications subject to change without notice
DIGITAL TIMING (Guaranteed over -40°C to 85°C, AVDD = DVDD = +5.0 V +/- 10%)
t
MCLK Period (FMCLK = 256*FLRCLK) 54 ns
DMP
t
MCLK LO Pulse Width (all modes) 0.4 X t
DML
t
MCLK HI Pulse Width (all modes) 0.4 X t
DMH
t
BCLK HI Pulse Width 20 ns
DBH
t
BCLK LO Pulse Width 20 ns
DBL
t
BCLK Period 60 ns
DBP
t
LRCLK Setup 20 ns
DLS
t
LRCLK Hold (DSP Serial Port mode only) 5 ns
DLH
t
SDATA Setup 5 ns
DDS
t
SDATA Hold 10 ns
DDH
t
CCLK Period 50 ns
DMP
t
CCLK LO Pulse Width 15 ns
DML
t
CCLK HI Pulse Width 15 ns
DMH
t
CLATCH Setup 10 ns
CLS
t
CLATCH Hold 10 ns
CLH
t
CDATA Setup 10 ns
CDS
t
CDATA Hold 10 ns
CDH
t
RST LO Pulse Width 15 ns
RSTL
Specifications subject to change without notice.
Min Typ Max Units
O
C
O
C
O
C
Min Typ Max Units
µs
µs
µs
Min
ns
DMP
ns
DMP
Units
Rev. PrF -3-
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