RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
1070
2-11
Table 2-4. XIA Hardware Interface Signal Definitions
Label
I/O Type
Signal Name/Description
OVERHEAD SIGNALS
P5VD, P5VT,
P5VR
PWR
Supply Voltage. Connect to VCC through a power decoupling filter.
DGND, A0VT,
A0VR
GND
Ground. Connect to analog ground.
REFERENCE SIGNALS AND MODEM INTERCONNECT
TXA1 (SPKHI),
TXA2 (SPKLO)
O(DF)
Transmit Analog 1 and 2 (Speaker Output). The TXA1 and TXA2 outputs are differential outputs 180 degrees
out of phase with each other. The output characteristics are the same as a 1458 type op amp.
RIN (MICOUT)
I(DA)
Receive Analog (Microphone Output). RIN is a single-ended microphone Input from the analog switch circuit.
The input impedance is > 70k ohms.
REFERENCE SIGNALS AND MODEM INTERCONNECT
~POR
MI
Power-On-Reset. Connect to MDP: ~POR (47).
~SLEEP
MI
Sleep. Connect to MDP: ~SLEEP (36).
VC
MI
Low Voltage Reference. Connect to analog ground through 10 µF (polarized, + terminal to VC) and 0.1 µF
(ceramic) in parallel.
VREF
MI
High Voltage Reference. Connect to VC through 10 µF (polarized, + terminal to VREF) and 0.1 µF (ceramic) in
parallel.
RXDAT
MI
Receive Data In. Connect to MDP: SR4IN (82).
TXDAT
MI
Transmit Data In. Connect to MDP: SR3OUT (83).
TMODE
MI
Transmitter Mode. Connect to XIA: RMODE (7).
RMODE
MI
Receiver Mode. Connect to MDP: RMODE (18) and XIA: TMODE (12).
CLKIN
MI
CLKIN. Connect to MDP: IACLK (50).
Notes:
1. I/O
types:
MI = Modem interconnect.
I(DA) = analog input (see Table 2-6).
O(DD), O(DF) = analog output (see Table 2-6).
Summary of Contents for RFX144V24-S23
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