CXD2720Q-2 datasheet(9/47 Pages) SONY

Part #	CXD2720Q-2

Description	Single-Chip Dolby Pro Logic Surround Decoder

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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

Ω

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

Ω

Rin = 22k

Ω

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

Vrms

k

Ω

mA

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

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