AK2365A Datasheet, PDF (26/33 Pages) Asahi Kasei Microsystems – FM IF Detector with Narrow Band Filter

[AK2365A]
17. AGC Operation
AK2365A has two AGC circuits, AGC1 and AGC2. The signal level from IFIP pin is adjustable
automatically by AGC1/2. The following graphs show IFIP input vs. IFOUT output characteristics by
setting {AGC1_STEP}=0/1, {IFOG[1:0]}=00, {AGC_OFF}=0. Setting {AGC_OFF}=1 can disable
automatic gain adjustable operation and also enable manual gain operation by {AGC1_G[5:0]},
{AGC2_G[4:0]} registers.
IFIP level vs. IFOUT level
(VDD=3V, AGC1_STEP=0)
20
10
0
-10
-20
-30
-40
-50
-110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10
IFIP input level [dBm]
IFIP level vs. IFOUT level
(VDD=3V, AGC1_STEP=1)
20
10
0
-10
-20
-30
-40
-50
-110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10
IFIP input level [dBm]
MS1591-E-03
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2015/4