FX506 Datasheet, PDF (2/17 Pages) Sanyo Semicon Device – High-Current Switching Applications

Pin Number Function
DIL Quad
FX506P FX506LG
FX506LS
1
Xtal: The output of the 4.0MHz on-chip clock oscillator.
2
Xtal/Clock: The input to the on-chip 4.0MHz clock oscillator inverter. All oscillator components are
included on-chip. A 4.0MHz Xtal or externally derived clock should be connected here.
See Figure 2.
3
V : Positive supply rail. A single, stable +5-volt supply is required. Levels and voltages within the
DD
Audio Processor are dependent upon this supply.
4
Post Process Audio Input: The analogue input to the Post-Process Path from external audio
operations. Inputs to this pin should be a.c. coupled via a capacitor C₇.
See Figures 2 and 4.
5
Pre-Process Audio Output: The analogue output to external audio operations.
See Figure 4.
6
Rx Audio Input: The input from the radio receiver demodulator. This input, which requires to be
a.c. coupled via capacitor C , is selected by serial data. Audio at this input will be available for use
6
as a signal-squelch noise source. See Figures 2 and 4.
7
V_BIAS: The output of the on-chip analogue bias circuitry, held internally at V_DD/2. This pin should be
decoupled to V via capacitor C . See Figure 2.
SS
1
8
CTCSS/Data Input: To allow the introduction of sub-audio tones or data to the VCO drives.
By manipulation of bits 17, 18 and 19 this input can be “mixed” into the signal path or added as a
burst in between speech segments.
9
Tx Audio Input: The pre-process transmit audio input. This input can be driven from an external
source or from the FX506 Mic. input circuitry. See Figures 2, 3 and 4.
10
Mic. Output: The output of the microphone multiplexer, selected by serial input data. If additional
gain is required for the pre-process input, an external amplifier as shown in Figure 3 is
recommended.
11
Mic.1 Input:
These separate microphone audio inputs are individually selected by the
serial input data. See Figures 2, 3 and 4.
12
Mic.2 Input:
13
V_SS: Negative supply rail (GND).
2