AD1846
Analog Signals
Pin Name
L_LINE
R_LINE
L_MIC
R_MIC
L_AUX1
R_AUX1
L_AUX2
R_AUX2
L_OUT
R_OUT
Miscellaneous
PLCC
30
27
29
28
39
42
38
43
40
41
I/O
I
I
I
I
I
I
I
I
O
O
Description
Left Line Input. Line level input for the left channel.
Right Line Input. Line level input for the right channel.
Left Microphone Input. Microphone input for the left channel. This signal can be ei-
ther line level or –20 dB from line level.
Right Microphone Input. Microphone input for the right channel. This signal can be
either line level or –20 dB from line level.
Left Auxiliary #1 Line Input
Right Auxiliary #1 Line Input
Left Auxiliary #2 Line Input
Right Auxiliary #2 Line Input
Left Line Level Output
Right Line Level Output
Pin Name
XTAL1I
XTAL1O
XTAL2I
XTAL2O
PWRDWN
PLCC
17
18
21
22
23
I/O
I
O
I
O
I
Description
24.576 MHz Crystal #1 Input
24.576 MHz Crystal #1 Output
16.9344 MHz Crystal #2 Input
16.9344 MHz Crystal #2 Output
Power-Down Signal. Active LO control places AD1846 in its lowest power consump-
tion mode. All sections of the AD1846, including the digital interface, are shut down
and consume minimal power.
Host Interrupt Pin. This signal is used to notify the host that the DMA Current Count
Register has underflowed.
External Control. These signals reflect the current status of register bits inside the
AD1846. They can be used for signaling or to control external logic. XLTL1 and
XLTL0 are open-drain outputs.
Voltage Reference. Nominal 2.25 volt reference available externally for dc-coupling and
level-shifting. V
REF
should not be used where it will sink or source current.
Voltage Reference Filter. Voltage reference filter point for external bypassing only.
Left Channel Filter Input. This pin requires a 1.0
µF
capacitor to analog ground for
proper operation.
Right Channel Filter Input. This pin requires a 1.0
µF
capacitor to analog ground for
proper operation.
No Connect. Do not connect.
INT
XCTL1:O
57
56 & 58
O
O
V
REF
V
REF
_F
L_FILT
R_FILT
NC
Power Supplies
32
33
31
26
46–52, 55
O
I
I
I
Pin Name
V
CC
GNDA
V
DD
GNDD
PLCC
35 & 36
34 & 37
1, 7, 15, 19,
24, 45, 54
2, 8, 16, 20,
25, 44, 53, 64
I/O
I
I
I
I
Description
Analog Supply Voltage (+5 V)
Analog Ground
Digital Supply Voltage (+5 V)
Digital Ground
–8–
REV. A
AD [ ANALOG DEVICES ]
