CXD2720Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD2720Q

Single-Chip Digital Signal Processor for Karaoke

Sony Semiconductor 

CXD2720Q

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 .................0Ω

Item

Measurement conditions

Min.

S/N ratio

1.0Vrms, EIAJ (with “A” weighting filter) 80

THD + N

1.0Vrms, EIAJ

0.5Vrms, EIAJ

Dynamic range

EIAJ

Channel separation

Only ADC characteristics using DAC1,

EIAJ

Level difference between

channels

Only ADC characteristics using DAC1

Analog full-scale input level

ADC input impedance

Rin = 0Ω

Rin = 22kΩ

Analog current consumption

Typ.

88

0.016

0.012

92

108

0.05

1.26

2.06

34.6

21

Max. Unit

dB

0.03

%

dB

dB

dB

Vrms

kΩ

mA

∗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 = 0Ω, 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.

–9–

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