CS4391 データシートの表示（PDF） - Cirrus Logic

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CS4391

24-Bit, 192 kHz Stereo DAC with Volume Control

Cirrus Logic 

CS4391

7. APPLICATIONS

7.1 Recommended Power-up Sequence

for Hardware Mode

1) Hold RST low until the power supplies, master,

and left/right clocks are stable.

2) Bring RST high.

7.2 Recommended Power-up Sequence

and Access to Control Port Mode

1) Hold RST low until the power supply, master,

and left/right clocks are stable. In this state, the

control port is reset to its default settings and

CMOUT will remain low.

2) Bring RST high. The device will remain in a

low power state with CMOUT low and the con-

trol port is accessible.

3) Write 11h to register 5 within 10 ms cycles fol-

lowing the release of RST.

4) The desired register settings can be loaded

while keeping the PDN bit set to 1.

5) Set the PDN bit to 0 which will initiate the pow-

er-up sequence which requires approximately

10 µS.

7.3 Analog Output and Filtering

The application note “Design Notes for a 2-Pole

Filter with Differential Input” discusses the sec-

ond-order Butterworth filter and differential to sin-

gle-ended converter which was implemented on the

CS4391 evaluation board, CDB4391. The CS4391

filter, as seen in Figure 14, is a linear phase design

and does not include phase or amplitude compensa-

tion for an external filter. Therefore, the DAC sys-

tem phase and amplitude response will be

dependent on the external analog circuitry.

C42

AOUTA-

C43

AOUTA+

10UF

10UF

R24

R26

AMUTEC

C7

2700PF

COG

GND

R28

5.62K

C6 560PF

COG

VCC

C49

.1UF

5.62K

5.62K

R17

R18

C14

2700PF

COG

GND

R15

5.62K

1.18K

1.18K

8

V+ U11 GND

2

-

1

3

+

MC33078D

C5

V- 4

560PF

COG

C48

GND

VEE

.1UF

GND

GND

VA+3/+5

2

MMUN2111LT1

1

Q3

3

Q4

1

MMUN2211LT1

3

R25

2K

2

GND

R20

560

J3

CON_RCA_RA

1

R5

2

47K

3

4 NC AOUTA

GND

GND

Q1

2SC2878 2

3

1

GND

Figure 15. CS4391 Output Filter

32

DS335PP4

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