Complete SDARS Receiver
Typical Operating Characteristics
(T A = +25°C, unless otherwise noted.)
INPUT RETURN LOSS
RF AGC ATTENUATION
0
vs. FREQUENCY
-10
RF AGC ENGAGEMENT THRESHOLD
60
vs. CONTROL VOLTAGE
-5
-15
DIVIDER: /4
50
-10
-15
-20
-25
40
30
T A = -40°C
T A = +25°C
MAXIMUM RF AGC
-20
-30
20
T A = +85°C
DIVIDER: /8
-25
-30
MINIMUM RF AGC
-35
-40
10
0
2.2
2.3
2.4
2.5
0
4
8
12
16
20
0
0.6
1.2
1.8
2.4
3.0
FREQUENCY (GHz)
RF AGC SETTLING TIME
WITH 20dB STEP
RF AGC ENGAGEMENT SETTING
IF AGC ATTENUATION
vs. CONTROL VOLTAGE
CONTROL VOLTAGE (V)
IF AGC ATTENUATION
vs. CONTROL VOLTAGE
0dBm
RF AGC ATTACK
70
60
R4 = 100 ?
C32 = 0.1 μ F
50
40
R4 = 5000 ?
C32 = 0.22 μ F
TIME
RF AGC DECAY
50
5dB/div
TIME
40
30
T A = -40°C
T A = +85°C
30
20
T A = -40°C
T A = +85°C
20
-50dBm
10
0
T A = +25°C
10
0
T A = +25°C
START TIME: 0 μ s
STOP TIME: 200 μ s
0
0.6
1.2 1.8
CONTROL VOLTAGE (V)
2.4
3.0
0
0.6
1.2 1.8
CONTROL VOLTAGE (V)
2.4
3.0
LPF FREQUENCY RESPONSE
0dB
10.250000MHz
-27.278dB
-100dB
1MHz
16MHz
_______________________________________________________________________________________
7
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