EVAL-AD1954EB Analog Devices Inc, EVAL-AD1954EB Datasheet - Page 8

• Manufacturer Part Number: EVAL-AD1954EB
• Description: BOARD EVAL FOR AD1954
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD1954EB

• Rohs Status: RoHS non-compliant

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 equalization
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.
AD1954–Typical Performance Characteristics
TPC 1. FFT of Full-Scale Sine Wave (32k Points)
–100
–120
–140
–160
–100
–120
–140
–160
–20
–40
–60
–80
TPC 2. FFT of –60 dB Sine Wave (32k Points)
–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 3. Frequency Response of EQ Biquad Filters
–10
–12
–14
–16
–18
–20
TPC 5. Tone-Burst Response with Compressor
Threshold Set to –20 dB
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–2
–4
–6
–8
3.0
2.5
2.0
1.5
1.0
0.5
–0.5
–1.0
–1.5
–2.0
0
2.0
1.5
1.0
0.5
0
–120
20
–120
0
–100
50
–100
TPC 4. Linearity Plot
100
–80
–80
200
Hz
dBFS
–60
ms
500
–60
1k
–40
2k
–20
–20
5k
10k
REV. A
0
0