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CXD2720Q-2 Datasheet(PDF) 33 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) 33 Page - Sony Corporation

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CXD2720Q-2
12. Input/Output Level Settings
[Relevant coefficients] Ki (address = 00H), KisLm (address = 0FH), KisRc (address = 10H),
KiaLm (address = 11H), KiaRc (address = 12H), KisRm (address = 13H),
KisLc (address = 14H), KiaRm (address = 15H), KiaLc (address = 16H),
Kre (address = 45H), Krd (address = 49H), Kfb (address = 4AH),
KLf (address = 3CH), KRf (address = 3DH), KLpc (address = 3EH),
KRpc (address = 3FH), KLpt (address = 40H), KRpt (address = 41H),
KdryE (address = 42H), KdryL (address = 51H), KdryR (address = 52H),
Keff (address = 53H), KLm (address = 54H), KRm (address = 55H),
KLmc (address = 56H), KRmc (address = 57H), KLo (address = 58H),
KRo (address = 59H), Kmut (address = 5AH)
The input/output levels and volumes are 2's complement format with a decimal point between D15 and D14,
and hexadecimal notation with D15 as MSB and D0 as LSB.
The coefficient and level relationships are as follows.
D15 to D0
8000H
FFFFH
0000H
0dB
–90.31dB
Level
D15 to D0
8000H
FFFFH
0000H
+12.04dB
–78.27dB
Level
Table 12-1. Input/Output Level Settings
(other than Kre)
Table 12-2. Input/Output Level Settings
(Kre)
The input/output levels for 8001H to FFFEH are determined by the following formulas.
14
(Coefficient value) = [ (–1)
× D15 + ∑Dn × 2n–15] × (–1) for other than Kre
n = 0
14
(Coefficient value) = [ (–1)
× D15 + ∑Dn × 2n–15] × (–4) for Kre
n = 0
Input/output level = 20log [coefficient value] dB
∗ D15 to D0 are negative values, but the calculation is (–1) × (D15 to D0).
∗ Kmut is the coefficient of the soft mute.
This approaches the specified value approximately every 45µs.
For example, when the output with its level of 0dB (8000H) is set to OFF (0000H), it takes approximately
1.49s to change from 8000H to 0000H.


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