AD1845 Analog Devices, AD1845 Datasheet - Page 8

• Manufacturer Part Number: AD1845
• Description: Parallel-port 16-Bit Soundport Stereo Codec
• Manufacturer: Analog Devices

AD1845
Analog Signals
Pin Name
L_LINE
R_LINE
L_MIC
R_MIC
L_AUX1
R_AUX1
L_AUX2
R_AUX2
L_OUT
R_OUT
M_IN
M_OUT
Miscellaneous
Pin Name
XTAL1I
XTAL1O
XTAL2I
XTAL2O
PWRDWN
INT
XCTL1:0
RESET
V
V
L_FILT
R_FILT
NC
REF
REF_F
30
27
29
28
39
42
38
43
40
41
47
17
18
21
22
56 & 58 71 & 73
31
26
PLCC TQFP
46
PLCC TQFP
23
57
24
32
33
48–52, 2–5, 21–24
55
31
28
30
29
45
48
44
49
46
47
12
13
16
17
33
25
56
57
18
72
19
35
38
26, 27, 32, 34,
36, 37, 39,
51–53, 58–66,
69, 70, 80–83,
94–97
I/O
I
I
I
I
I
I
I
I
O
O
I
O
I/O
I
O
I
O
O
I
O
I
I
I
Left Line Input.
Left Auxiliary #1 Line Input.
Left Auxiliary #2 Line Input.
24.576 MHz Crystal #1 Input.
Not used on the AD1845.
External Control. These signals reflect the current status of register bits inside the
Left Channel Filter. This pin requires a 1.0 F capacitor to analog ground for proper
Description
Right Line Input.
Left Microphone Input. This signal can be either line level or –20 dB from line level
(using the on-chip 20 dB gain block).
Right Microphone Input. This signal can be either line level or –20 dB from line level
(using the on-chip 20 dB gain block).
Right Auxiliary #1 Line Input.
Right Auxiliary #2 Line Input.
Left Line Output.
Right Line Output.
Mono Input.
Mono Output.
Description
24.576 MHz Crystal #1 Output.
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.
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 pulse width of the reset signal.
Voltage Reference. Nominal 2.25 volt reference available for dc-coupling and level-
shifting. V
Voltage Reference Filter. Voltage reference filter point for external bypassing only.
operation.
Right Channel Filter. This pin requires a 1.0 F capacitor to analog ground for proper
operation.
No Connect.
REF
should not be used to sink or source current.
–8–
REV. B