AD1821 Analog Devices, AD1821 Datasheet - Page 10
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AD1821
Manufacturer Part Number
AD1821
Description
Manufacturer
Analog Devices
Datasheet
1.AD1821.pdf
(44 pages)
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AD1821
Analog Signals
Pin Name
MIC
L_LINE
R_LINE
L_SYNTH
R_SYNTH
L_CD
R_CD
L_VID
R_VID
L_OUT
MDM_OUT/
R_OUT
MDM_IN/
PHONE_IN
PHONE_OUT
RX3D
CX3D
PQFP
44
42
41
46
45
48
47
32
30
29
43
28
26
27
31
I/O
I
I
I
I
I
I
I
I
O
O
I
O
O
I
I
Description
Microphone Input. The MIC input may be either line-level or –20 dB from line-level (the
difference being made up through a software controlled 20 dB gain block). The mono MIC
input may be sent to the left and right channel of the ADC for conversion, or gained/
attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then summed with left and right
line OUT before the Master Volume stage.
Left Line-Level Input. The left line-level input may be: sent to the left channel of the
ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then summed with
left line OUT.
Right Line-Level Input. The right line-level input may be: sent to the right channel of the
ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then summed with
right line OUT.
Left Synthesizer Input. The left MIDI upgrade line-level input may be: sent to the left
channel of the ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then
summed with left line OUT.
Right Synthesizer Input. The right MIDI upgrade line-level input may be: sent to the right
channel of the ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then
summed with right line OUT.
Left CD Line-Level Input. The left CD line-level input may be: sent to the left channel of
the ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then summed
with left line OUT.
Right CD Line-Level Input. The right CD line-level input may be: sent to the right chan-
nel of the ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then
summed with right line OUT.
Left Video Input. The left audio track for a video line-level input may be: sent to the left
channel of the ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and then
summed with left line OUT.
Right Video Input. The right audio track for a video line-level input may be: sent to the
right channel of the ADC; gained/attenuated from +12 dB to –34.5 dB in 1.5 dB steps and
then summed with right line OUT.
Left Output. Left channel line-level post-mixed output. The final stage passes through the
Master Volume block and may be attenuated 0 dB to –45 dB in 1.5 dB steps.
Modem Output/Right Output. Right channel line-level post-mixed output. The final stage
passes through the Master Volume block and may be attenuated 0 dB to –45 dB in 1.5 dB
steps.
Modem Input/Phone Input. Line-level input from a DAA/modem chipset.
Phone Output. Line-level output from a DAA/modem chipset.
Phat™* Stereo Phase Expander filter network, resistor pin.
Phat™* Stereo Phase Expander filter network, capacitor pin.
PIN FUNCTION DESCRIPTIONS
–10–
REV. 0