DA1845JST データシートの表示（PDF） - Analog Devices

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DA1845JST

Parallel-Port 16-Bit SoundPort® Stereo Codec

Analog Devices 

AD1845

Analog Signals

Pin Name PLCC TQFP I/O Description

L_LINE

30

31

I

Left Line Input.

R_LINE

27

28

I

Right Line Input.

L_MIC

29

30

I

Left Microphone Input. This signal can be either line level or –20 dB from line level

(using the on-chip 20 dB gain block).

R_MIC

28

29

I

Right Microphone Input. This signal can be either line level or –20 dB from line level

(using the on-chip 20 dB gain block).

L_AUX1 39

45

I

Left Auxiliary #1 Line Input.

R_AUX1 42

48

I

Right Auxiliary #1 Line Input.

L_AUX2 38

44

I

Left Auxiliary #2 Line Input.

R_AUX2 43

49

I

Right Auxiliary #2 Line Input.

L_OUT

40

46

O Left Line Output.

R_OUT

41

47

O Right Line Output.

M_IN

46

56

I

Mono Input.

M_OUT

47

57

O Mono Output.

Miscellaneous

Pin Name PLCC TQFP I/O

XTAL1I

17

12

I

XTAL1O 18

13

O

XTAL2I

21

16

XTAL2O 22

17

PWRDWN 23

18

I

INT

57

72

O

XCTL1:0 58 & 56 73 & 71 O

RESET

24

19

I

VREF

VREF_F

L_FILT

R_FILT

NC

32

35

O

33

38

I

31

33

I

26

25

I

48–52,

55

2–5, 21–24

26, 27, 32, 34,

36, 37, 39,

50–53, 58–66,

69, 70, 80–83,

94–97

Description

24.576 MHz Crystal #1 Input.

24.576 MHz Crystal #1 Output.

Not used on the AD1845.

Not used on the AD1845.

Power Down Signal. Active LO places the AD1845 in its lowest power consumption

mode. All sections of the AD1845, including the digital interface, are shut down and

consume minimal power.

Host Interrupt Pin. A host interrupt is generated to notify the host that a specified

event has occurred.

External Control. These signals reflect the current status of register bits inside the

AD1845. They can be used for signaling or to control external logic.

Reset. Active LO resets all digital registers and filters, and resets all analog filters. Active

LO places the AD1845 in the lowest power consumption mode. XTAL1 is required to be

running during the minimum low pulsewidth of the reset signal.

Voltage Reference. Nominal 2.25 volt reference available for dc-coupling and level-

shifting. VREF should not be used to sink or source current.

Voltage Reference Filter. Voltage reference filter point for external bypassing only.

Left Channel Filter. This pin requires a 1.0 µF capacitor to analog ground for proper

operation.

Right Channel Filter. This pin requires a 1.0 µF capacitor to analog ground for proper

operation.

No Connect.

–8–

REV. C

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