EVAL-AD1953EBZ Analog Devices Inc, EVAL-AD1953EBZ Datasheet - Page 24

• Manufacturer Part Number: EVAL-AD1953EBZ
• Description: BOARD EVAL FOR AD1953 3CH 24BIT
• Manufacturer: Analog Devices Inc
• Series: SigmaDSP®r
• Type: Audio Processorr

Specifications of EVAL-AD1953EBZ

• Contents: Evaluation Board
• For Use With/related Products: AD1953
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD1953
Address
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
NOTES
1
2
Options for Parameter Updates
The parameter and program RAMs can be written and read
using one of several methods.
1. Direct Read/Write. This method allows direct access to the
2. Direct Read/Write after Core Shutdown. This method avoids
The detector hold and decay times are integer values, while the rest of the parameters are fractional twos complement values.
The default decay time of the hold/release circuit is set fast enough that the decay is dominated by the time constant of the rms detector.
RAMs. Since the RAMs are also being used during real-time
DSP operation, a glitch will likely occur at the output. This
method is not recommended.
the glitch while accessing the internal RAMs by first shutting
down the core. This is recommended for transferring large
amounts of data, such as initializing the parameter RAM at
power-up or downloading a completely new program. These
Table VI. Parameter RAM Contents (continued)
Function
IIR0 Xover Left b2
IIR0 Xover Left a1
IIR0 Xover Left a2
IIR1 Xover Left b0
IIR1 Xover Left b1
IIR1 Xover Left b2
IIR1 Xover Left a1
IIR1 Xover Left a2
IIR0 Xover Right b0
IIR0 Xover Right b1
IIR0 Xover Right b2
IIR0 Xover Right a1
IIR0 Xover Right a2
IIR1 Xover Right b0
IIR1 Xover Right b1
IIR1 Xover Right b2
IIR1 Xover Right a1
IIR1 Xover Right a2
IIR0 Xover Sub b0
IIR0 Xover Sub b1
IIR0 Xover Sub b2
IIR0 Xover Sub a1
IIR0 Xover Sub a2
IIR1 Xover Sub b0
IIR1 Xover Sub b1
IIR1 Xover Sub b2
IIR1 Xover Sub a1
IIR1 Xover Sub a2
IIR2 Xover Sub b0
IIR2 Xover Sub b1
IIR2 Xover Sub b2
IIR2 Xover Sub a1
IIR2 Xover Sub a2
IIR Sub rms b0
IIR Sub rms b1
IIR Sub rms b2
IIR Sub rms a1
IIR Sub rms a2
Default Value
in Fractional
2.20 Format
0
0
0
1.0
0
0
0
0
1.0
0
0
0
0
1.0
0
0
0
0
1.0
0
0
0
0
1.0
0
0
0
0
1.0
0
0
0
0
1.0
0
0
0
0
–24–
Address
110–142
143
144
145–177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
3. Safeload Writes Up to five SPI registers are loaded with
The next section discusses these options in more detail.
transfers can be sped up by using burst mode, where an
initial address followed by blocks of data are sent to the RAM.
address/data intended for the parameter RAM. The data is then
transferred to the requested address when the RAM is not busy.
This method can be used for dynamic updates while live
program material is playing through the AD1953. For example,
a complete update of one biquad section can occur in one
audio frame while the RAM is not busy. This method is not
available for writing to the program RAM or control registers.
Table VI. Parameter RAM Contents (continued)
Function
Main Compressor
Look-Up Table Base
Main Compressor
Attack/rms Time
Constant
Main Post-Compressor
Gain
Subwoofer Compressor
Look-Up Table Base
Sub Compressor
Attack/RMS Time
Constant
Post-Compressor
Gain (SUB)
High-Pass Filter
Cutoff Frequency
Main Compressor
Look-Ahead Delay
Delay Left
Delay Right
Delay Sub
Stereo Spreading
Coefficient
Stereo Spreading
Frequency Control
Subwoofer Reinjection
to Main Left
Subwoofer Reinjection
to Main Right
Subwoofer Channel
Input Gain from Left IN
Subwoofer Channel
Input Gain from Right IN
Main Detector Hold Time, 0
Samples (4095 MAX)
Sub Detector Hold Time, 0
Samples (4095 MAX)
Main Detector Decay Time 0x3FFFFF
Sub Detector Decay Time
Default Value
in Fractional
2.20 Format
1.0 (all)
(120 dB/sec)
1.0
1.0 (all)
5.75
(120 dB/sec)
1.0
0
0
0
0
0
0.0
0.0
0.5
0.5
(4.597
0x3FFFFF
(4.597
5.75
3.92
0.112694
1
1
10
10
10
10
10
–4
–4
–4
REV. 0
6
6
dB/sec)
dB/sec)
1, 2
1, 2