CXD2728Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD2728Q

Single-Chip Dolby Pro Logic Surround Decoder

Sony Semiconductor 

CXD2728Q

1-1. When Pro Logic Mode is off

Unless otherwise specified, the measurement conditions are as given below.

• VIN (L, R, C, S) = 2Vrms (0dB), 1kHz

• Sampling frequency = 44.1kHz

• Measured bands = 10Hz to 20kHz

Item

Measurement conditions Channels Min. Typ. Max. Unit

S/N ratio

(THD + N)/S∗1

Dynamic range∗2

ADC maximum input level∗3

Output level∗4

"A" weighting filter

0dB

"A" weighting filter

(all)

90

dB

(all)

0.006

%

(all)

90

dB

506

mVrms

(all)

2.00

Vrms

Power supply fluctuation

elimination ratio∗5

100mVrms, 100Hz sine wave (all)

–6

dB

∗1 See Graph 1: ADC Characteristics.

∗2 S/(THD + N) during –60dB input

∗3 The ADC maximum input level depends on the supply voltage (AVDn), so when the supply voltage (AVDn)

contains deviation, calculate the maximum input level from the formula below and adjust the level so that

the waveform is not clipped at the minimum voltage.

Minimum supply voltage [V]

Maximum input level [Vrms] = 0.506 [Vrms] ×

3.3 [V]

∗4 Like the ADC, the DAC conversion gain also varies according to the supply voltage (AVDn). However, the

DAC has the reverse characteristics of the ADC, so the total gain between the ADC and DAC is constant.

∗5 Including amplification by the external amplifier (L/Rch: 11.35dB, C/Sch: 14.42dB)

5

2

1

0.500

0.200

0.100

0.050

0.020

0.010

0.005

0.002

0.001

2m 3m 5m

10m 20m 50m 0.1 0.2

GEN VOLT [Vrms]

0.5 1 2

Graph 1. ADC Characteristics

–9–

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