AD1845JSTZ Datasheet, PDF (8/40 Pages) Analog Devices – Parallel-Port 16-Bit SoundPort Stereo Codec

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
R_AUX2 43
49
I
L_OUT
40
46
O
R_OUT
41
47
O
E M_IN
46
56
I
M_OUT
47
57
O
T ^{Miscellaneous}
Pin Name PLCC TQFP I/O
XTAL1I
17
12
I
E ^{XTAL1O 18}
13
O
XTAL2I
21
16
XTAL2O 22
17
L _{PWRDWN 23}
18
I
INT
57
72
O
O _{XCTL1:0 58 & 56 73 & 71 O}
S RESET
24
19
I
V_REF
32
35
O
B _{VREF_F}
33
38
I
O ^L_FILT
31
33
I
Left Auxiliary #2 Line Input.
Right Auxiliary #2 Line Input.
Left Line Output.
Right Line Output.
Mono Input.
Mono Output.
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. V_REF 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.
R_FILT
26
25
I
Right Channel Filter. This pin requires a 1.0 µF capacitor to analog ground for proper
operation.
NC
48–52, 2–5, 21–24
No Connect.
55
26, 27, 32, 34,
36, 37, 39,
50–53, 58–66,
69, 70, 80–83,
94–97
–8–
REV. C