User's Manual

VOLTAGE CHART SST-442
25
REF PIN TX RX SB DESCRIPTION
IC303 1 2.4 2.4 * Audio processing
22.42.4*
32.42.4*
45.05.0*
52.42.4*
62.42.4*
72.42.4*
82.42.4*
92.42.4*
10 2.4 2.4 *
11 GND GND GND
12 2.4 2.4 *
13 2.4 2.4 *
14 2.4 2.4 *
IC304 1 0.0 0.0 * Audio signal switching
22.42.4*
32.42.4*
42.42.4*
50.02.5*
6 GND GND GND
7 GND GND GND
8 GND GND GND
9 5.0 0.0 0.0
10 5.0 0.0 0.0
11 5.0 0.0 0.0
12 2.4 2.4 *
13 NC NC NC
14 0.0 2.4 *
15 0.0 2.4 *
16 5.0 5.0 5.0
IC305 1 2.4 2.4 * Audio processing
22.42.4*
32.42.4*
4 GND GND GND
52.42.4*
62.42.4*
72.42.4*
85.05.0*
IC306 1 2.0 2.0 * Audio signal level
2 NC NC NC control
3 GND GND GND
40.02.5*
52.42.4*
62.42.4*
72.42.4*
80.00.0*
95.05.0*
10 GND GND GND
11 NC NC NC
12 0.0 0.0 *
13 2.4 2.4 *
14 2.4 2.4 *
15 2.4 2.4 *
16 2.4 2.4 *
17 2.4 2.4 *
18 NC NC NC
19 5.0 5.0 *
20 5.0 5.0 *
IC307 1 NC NC NC Audio amplifier
2 0.0 0.0 0.0
3 GND GND GND
4 GND GND GND
5 0.0 3.7 0.0
6 0.0 7.5 0.0
7 0.0 3.7 0.0
8 NC NC NC
REF PIN TX RX SB DESCRIPTION
IC308 1 2.4 2.4 * Tone low pass filter
22.42.4*
3 GND GND GND
45.05.0*
52.42.4*
62.42.4*
75.05.0*
83.23.2*
IC309 1 7.5 7.5 7.5 +5 VDC voltage
2 GND GND GND regulator
3 7.5 7.5 7.5
4NCNCNC
55.05.05.0
IC401 1 →→→ → 3.6 MHz clock signal
2 5.0 5.0 * Frequency synthesizer
3NCNCNC
4NCNCNC
55.05.05.0
6 →→ * → 1.5 – 4.5 VDC VCO
7 GND GND GND tuning voltage
82.22.2*
9NCNCNC
10 2.4 2.4 *
11 2.4 2.4 *
12 5.0 5.0 *
13 NC NC NC
14 5.0 5.0 5.0
15 0.0 0.0 *
16 NC NC NC
17 5.0 5.0 5.0
18 5.0 5.0 *
19 0.0 0.0 *
20 2.2 → 2.2 → * → 14.4 MHz reference
Q 101 1 5.0 4.3 * RX +V switching
25.05.0*
30.04.7*
Q 102 1 0.0 0.7 * RX RF amplifier
2 GND GND GND
30.03.0*
Q 103 1 0.0 4.7 * RX mixer
20.00.0*
30.01.8*
Q 104 1 0.0 0.7 * RX IF amplifier
2 GND GND GND
30.01.2*
Q 105 1 0.0 0.7 * RX 2
nd
LO
2 GND GND GND multiplier/amp
30.04.6*
Q 201 1 6.8 7.5 7.5 TX +V switching
27.57.57.5
37.00.00.0
Q 202 1 5.0 0.0 0.0 TX +V switching
24.30.00.0
36.87.57.5
Q 203 1 0.7 0.0 0.0 TX RF amplifier
2 GND GND GND
35.60.00.0