AN18208A
Technical Data (continued)
y I/O block circuit diagrams and pin function descriptions (continued)
Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed.
Pin Waveform
No. and voltage
Internal circuit
Impedance
Description
21
—
22 DC bias = 3.5 V
23
—
24 DC bias = 3.5 V
25
Composite
signal
26
—
27
AM-AF
21
1k
GND
12k
GND
VCC
7.35k 1.05k
GND
22
GND
23
1k
GND
12k
GND
VCC
7.35k 1.05k
GND
1.05k
25
24
GND
498k
GND
3.5 V
AM-DET
FM-DET
205
26
GND
12k
GND
1.05k
27
10k
GND
3.5 V
1 kΩ
TUNED/Test
SD-OUT
FM/AM tuning indicator
Test monitor output
8.4 kΩ
L-ch. de-emphasis output
(External capacitor
0.0056 μF ≅ 50 μs)
1 kΩ
ST-OUT
FM stereo indicator
8.4 kΩ
R-ch. de-emphasis output
(External capacitor
0.0056 μF ≅ 50 μs)
500 kΩ
FM MPX input
200 Ω
FM/AM detector output
(Please leave it open when
unused.)
11 kΩ
AM AF input
SDC00079AEB
31