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Analog Devices Semiconductor Electronic Components Datasheet



AD1955

High Performance Multibit DAC with SACD Playback



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AD1955 pdf
PRELIMINARY TECHNICAL DATA
a
High Performance Multibit Σ∆ DAC
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,
I2S-Compatible and DSP Serial Port
28 Lead SSOP Plastic Package
FUNCTIONAL BLOCK DIAGRAM
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 continuous-
time 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, I2S, Right-Justified, or
DSP serial port compatible modes. It can support MSB first, twos-
compliment 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 28-
pin SSOP package for operation over the temperature range -400C to
+1050C.
Master Clock
Input
Control Data
Input
3
Digital
Supply
16/20/24Bit
Audio Data /
External Digital
Filter Input
3/4
Auto-Clock
Divider
SPI
Control
Serial Data
Digital
M
U
Interface
Filter
Engine
X External
Filter I/F
Multibit
Sigma-Delta
S/H Modulator
Noise-
Shaped
Scrambling
Voltage
Reference
I-DAC
I-DAC
L-ch
Differential
Current Output
R-ch
DSD
Bitstream
Input
4
DSD
Filter
RESET
MUTE
Analog ZERO Flags
Supply
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



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AD1955 pdf
AD1955
PRELIMINARY TECHNICAL DATA
TEST CONDITIONS UNLESS OTHERWISE NOTED
Analog Supply Voltages (AVDD)
Digital Supply Voltages (DVDD)
Reference Current (Iref)
+5.0V
+5.0V
.960 mA
Ambient Temperature
25OC
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
24 Bits
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)
Output Capacitance at Each Output Pin
Output bias current, Each Output
8.64
-3.24
100
mA p-p
pF
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).
Specifications subject to change without notice.
DIGITAL I/O (-40oC to 105oC)
Input Voltage HI (VIH)
Input Voltage LO (VIL)
Input Leakage (IIH@VIH=2.4 V)
Input Leakage (IIL@VIL=0.8 V)
High Level Output Voltage (VOH) IOH = 1 mA
Low Level Output Voltage (VOL) IOL = 1 mA
Input Capacitance
Specifications subject to change without notice
Min
2.0
2.4
Typ Max Units
V
0.8 V
10 uA
10 uA
V
0.4 V
20 pF
-2- Rev. PrF



Part Number AD1955
Description High Performance Multibit DAC with SACD Playback
Maker Analog Devices - Analog Devices
Total Page 10 Pages
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