AD1953 Analog Devices, AD1953 Datasheet - Page 8

• Manufacturer Part Number: AD1953
• Description: SigmaDSP Digital Audio Processor
• Manufacturer: Analog Devices

AD1953–Typical Performance Characteristics
PERFORMANCE PLOTS
The following plots demonstrate the performance achieved on the
actual silicon. TPC 1 shows an FFT of a full-scale 1 kHz signal
with a THD+N of –100 dB, which is dominated by a second
harmonic. TPC 2 shows an FFT of a –60 dB sine wave, demon-
strating the lack of low level artifacts. TPC 3 shows a frequency
response plot with the seven equalization biquads set to an alter-
nating pattern of 6 dB boosts and cuts. TPC 4 shows a linearity
plot, where the measurement was taken with the same equaliza-
tion curve used to make TPC 3. When the biquad filters are not
in use, the signal passes through the filters with no quantization
effects. TPC 4 therefore demonstrates that using double-precision
math in the biquad filters has virtually eliminated any quantization
artifacts. TPC 5 shows a tone-burst applied to the compressor,
with the attack and recovery characteristics plainly visible. The
rms detector was programmed for normal rms time constants;
the hold/decay feature was not used for this plot.
TPC 1. FFT of Full-Scale Sine Wave (32k Points)
–100
–120
–140
–160
–100
–120
–140
–160
TPC 2. FFT of –60 dB Sine Wave (32k Points)
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
2
2
4
4
6
6
8
8
kHz
kHz
10
10
12
12
14
14
16
16
18
18
20
20
–8–
TPC 5. Tone-Burst Response with Compressor
Threshold Set to –20 dB
TPC 3. Frequency Response of EQ Biquad Filters
–10
–12
–14
–16
–18
–20
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
–2
–4
–6
–8
3.0
2.5
2.0
1.5
1.0
0.5
0
–120
–120
0
0
20
–100
–100
50
TPC 4. Linearity Plot
100
–80
–80
200
dBFS
Hz
–60
ms
500
–60
–40
1k
–20
–20
5k
REV. 0
10k
0
0