AD1953YSTRL7 Analog Devices Inc, AD1953YSTRL7 Datasheet - Page 9

• Manufacturer Part Number: AD1953YSTRL7
• Description: IC DSP DAC AUDIO3CH/26BIT 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SigmaDSP®r

Specifications of AD1953YSTRL7

• Rohs Status: RoHS non-compliant
• Number Of Bits: 26
• Data Interface: Serial
• Number Of Converters: 3
• Voltage Supply Source: Analog and Digital
• Power Dissipation (max): 540mW
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• For Use With: EVAL-AD1953EBZ - BOARD EVAL FOR AD1953 3CH 24BIT
• Settling Time: -

PRODUCT OVERVIEW (continued from page 1)
An extensive SPI port allows click-free parameter updates, along
with readback capability from any point in the algorithm flow.
The AD1953 also includes ADI’s patented multibit Σ-∆ DAC
architecture. This architecture provides 112 dB SNR and dynamic
range and THD+N of –100 dB. These specifications allow the
AD1953 to be used in applications ranging from low end
boom-boxes to high end professional mixing/editing systems.
The AD1953 has a digital output that allows it to be used purely
as a DSP. This digital output can also be used to drive an exter-
nal DAC to extend the number of channels beyond the three
that are provided on the chip. This chip can be used with either
its default signal processing program or with a custom user-
designed program. Graphical programming tools are available
from ADI for custom programming.
Features
The AD1953 is comprised of a 26-bit DSP (48-bit with double-
precision) for interpolation and audio processing, three multibit
Σ-∆ modulators, and analog output drive circuitry. Other features
include an on-chip parameter RAM using a “safe-upload” feature
for transparent and simultaneous updates of filter coefficients.
Digital de-emphasis filters are also included. On-chip input
selectors allow up to three sources of serial data and master
clock to be selected. The 3-channel configuration is especially
useful for 2.1 playback systems that include two satellite speakers
and a subwoofer. The default program allows for independent
equalization and compression/limiting for the satellite and
subwoofer outputs. Figure 1 shows the block diagram of the device.
The AD1953 contains a program RAM that is booted from an
internal program ROM on power-up. Signal-processing param-
eters are stored in a 256-location parameter RAM, which is
initialized on power-up by an internal boot ROM. New values
are written to the parameter RAM using the SPI port. The
values stored in the parameter RAM control the IIR equalization
filters, the dual-band compressor/limiter, the delay values, and
the settings of the stereo spreading algorithm.
REV. 0
SERIAL DATA I/O
(2-CHANNEL
AUX SERIAL
DATA INPUT
CLOCK I/O
AND TDM)
MASTER
GROUP
GROUP
GROUP
SPI I/O
3
3
3
3
3
DVDD AVDD ODVDD
FILTCAP
MCLK
AUDIO
MUX
MUX
DATA
SPI PORT
3:1
3:1
1
1
NOTES
1
2
CONTROLLED THROUGH SPI CONTROL REGISTERS
DAC DOES NOT USE DIGITAL INTERPOLATION
3
256/512 f
GENERATOR
(256/512 f
REGISTERS
REGISTERS
TRAP REG.
SAFELOAD
CONTROL
(I
Figure 1. Block Diagram
2
MCLK
S, SPI)
ZEROFLAG
SERIAL
IN
S
S
OUT
1
IN)
1
–9–
The AD1953 has a very sophisticated SPI port that supports
complete read/write capability of both the program RAM and
the parameter RAM. Two control registers are also provided to
control the chip serial modes and various other optional fea-
tures. Handshaking is included for ease of memory uploads/
downloads.
The AD1953 contains eight independent data-capture circuits
that can be programmed to tap the signal flow of the processor
at any point in the DSP algorithm flow. Two of these data-
capture circuits can be read back over the SPI port, and the
other six are fed to a serial output pin operating either in TDM
mode (for all six channels) or 2-channel mode for simple con-
nection to an external DAC. This allows the basic functionality
of the AD1953 to be easily extended.
The processor core in the AD1953 has been designed from the
ground up for straightforward coding of sophisticated compres-
sion/limiting algorithms. The AD1953 contains two independent
compressor/limiters with rms based amplitude detection and
attack/hold/release controls, together with an arbitrary compres-
sion curve that is loaded by the user into a lookup table that
resides in the parameter RAM. The compressor also features
look-ahead compression, which prevents compressor overshoots.
The AD1953 has a 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 AD1953
can be configured in left-justified, I
serial port compatible modes. It can support 16, 20, and 24 bits
in all modes. The AD1953 accepts serial audio data in MSB
first, twos complement format. The part can also be set up in a
4-channel serial input mode by simultaneously using the serial
input mux and the auxiliary serial input.
The AD1953 operates from a single 5 V power supply. It is
fabricated on a single monolithic integrated circuit and is housed
in a 48-lead LQFP package for operation over the temperature
range –40°C to +105°C.
3.45 (DOUBLE PRECISION)
3.23 (SINGLE PRECISION)
PROGRAM
MEMORY CONTROLLERS
512
DATA MEMORY, 512
RAM
DATA FORMAT:
DSP CORE
35
26
22
PARAMETER
256
RESETB MUTE
RAM
AGND
22
26
3
DCSOUT TRAP
REFERENCE
DAC –SW
DAC – L
DAC – R
COEFFICIENT
VOLTAGE
BIAS
VREF
DGND
64
DE-EMPHASIS
ROM
2
2
22
2
S, right-justified, or DSP
ANALOG
BIAS
DCSOUT
ANALOG
OUTPUTS
AD1953