FETAudio FDA-2A Manual - page 13
FDA-2A Manual.doc
Rev. 1.0
Page 13
31-Aug-2012
12. JUMPERS, RESISTOR AND PIN HEADER DESCRIPTION:
Location
Description
R53/R88
Short one of these resistors; R88 = I2S Mute at J5 pin 9 is active High;
R53 = I2S Mute is active LOW. Default is R88 short (active high).
R171
If shorted, then the I2S Mute pin 9 is shorted to ground, thus the Mute
conditions will depend on the setting of R53 and R88. Default is R171
open.
R107/R106
Short one of these resistors; If R107 is shorted, I2S input will be selected
at (A,B,C)=(0,0,0) – this mode is for 4 input (3 digital and one I2S); If
R106 is shorted, I2S input will be selected at (A,B,C)=(1,0,0) – default
mode for 5 input (4 digital and one I2S)
R172/R89
Short one of these resistors; Short R172 (I-Mute) to use internal
WM8805 mute control (Hardware mode); Short R89 (M-mu) to use
external MCU Mute Input control at J52 (software mode).
J52
MCU mute input, active High (M-mi).
J51
MCU reset input, active Low (M-Rst).
J30
FS(SR) Sample frequency output from internal I2S bus; for MCU to
measure the sample frequency
J31
Clock Out of WM8805 pin, same frequency as crystal (12Mhz) in
hardware mode. Programmable clock out in software mode.
J50
XO-In for WM8805 pin 15, connect to external low jitter XO. 12Mhz
crystal Y1 should be removed when external XO is used.
L1/L24
L1 and L24 are for 3V3 and 5V optical receiver at U3 respectively. Only
one of the inductor should be connected per the spec of the Toslink.
L10
Provide 5V to digital supply of AD1955. Should not connect if U1 is
present.
J22
Same as J3, AES input
J23
Same as J4, SPDIF1 input
J18
Same as J4, SPDIF2 input
J61
Same as U3, Toslink input
J32 / R81 /
R91 / R92 /
R118
For hardware mode, J32 Short, R81, R91, R92, R118 open; for software
mode, reverse above.
J53
Must be shorted for SPDIF IN when T2 and T3 is not used. Open when
T2 and T3 are used.
J57
Optical input with or without capacitor couple to buffer. Short is no
capacitor couple.
R39
Should be shorted for SPDIF1 IN to work without T2.
J8/R85
Short only one of them; J8 is for SPDIF Out; R85 is for SPDIF2 IN without
T3.
JMP1
If connected, the M3 hole near to it will be connected to analogy ground
JMP2
Short the Ground connector of Left and Right RCA sockets.
JMP3
Short to supply 3.3V to digital switch for U2 and U15 in hardware mode.
Remove it for software mode.
C95/C96/C97 Can be used to connect a MOV for surge suppression, not provided
H09 to H016 Output couple capacitor connection points for large film capacitor. Two
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