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CXD2720Q-2 Datasheet(PDF) 9 Page - Sony Corporation

Part No. CXD2720Q-2
Description  Single-Chip Dolby Pro Logic Surround Decoder
Download  47 Pages
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Manufacturer  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXD2720Q-2 Datasheet(HTML) 9 Page - Sony Corporation

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CXD2720Q-2
Analog Characteristics (AVD0 to 5 = VDD0 to 3 = XVDD = 5.0V, AVS0 to 5 = VSS0 to 7 = XVSS = 0.0V, Ta = 25°C,
DSP: each function = OFF, gain = 1)
[1] ADC + DAC connection total characteristics
The measurement circuit in Figure 1-1 is used. Unless otherwise indicated, the measurement conditions are as
given below.
• Input signal ...1.0Vrms, 1kHz
• fs....................44.1kHz
• Rin .................0
Item
S/N ratio
THD + N
Dynamic range
Channel separation
Level difference between
channels
Analog full-scale input level∗1
ADC input impedance
Analog current consumption
1.0Vrms, EIAJ (with “A” weighting filter)
1.0Vrms, EIAJ
0.5Vrms, EIAJ
EIAJ
Only ADC characteristics using DAC1,
EIAJ
Only ADC characteristics using DAC1
Rin = 0
Rin = 22k
80
88
0.016
0.012
92
108
0.05
1.26
2.06
34.6
21
0.03
Measurement conditions
Min.
Typ.
Max.
1 Analog input level which outputs digital full scale.
An optional analog input signal level Vin (Vrms) of 1.26Vrms or more can be set in digital full scale by the
measurement circuit external resistor Rin.
The calculation formula for external resistor Rin is:
Rin = 27.5
× Vin – 34.6 [kΩ]......(1)
However, THD + N characteristics deteriorate for full-scale output as shown in Graph 1, so use of up to 80%
(when Rin = 0
Ω, 0.8 × 1.26 (Vrms) = 1.0 (Vrms) → “analog full scale”) of the analog signal level is recommended
for digital full-scale output.
In this case, the Rin calculation formula is the same as formula (1), except that Vin becomes 1.25
× Vin.
Note that this change causes the output level after ADC + DAC to change.
Most of the above specifications are measurement values for analog full scale.
Unit
dB
%
dB
dB
dB
Vrms
k
mA


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