Manual

MAX3580
Direct-Conversion TV Tuner
_______________________________________________________________________________________ 9
-45
-55
-65
-75
02010 30 40 50
STOPBAND NOISE vs. FREQUENCY
MAX3580 tpc15
FREQUENCY (MHz)
STOPBAND NOISE (dBm)
BB_BW <3:0> = "1011"
8MHz CHANNEL MODE
BB_BW <3:0> = "1001"
7MHz CHANNEL MODE
0
10
5
20
15
25
30
VHF MODE NOISE FIGURE
vs. BB_AGC VOLTAGE
MAX3580 toc16
BB_AGC VOLTAGE (V)
NOISE FIGURE (dB)
0 1.0 1.50.5 2.0 2.5 3.0
T
A
= +25°C
T
A
= +55°C
T
A
= -40°C
T
A
= +85°C
220MHz
RF_AGC = 2.85V
0
10
5
20
15
25
30
UHF MODE NOISE FIGURE
vs. BB_AGC VOLTAGE
MAX3580 toc17
BB_AGC VOLTAGE (V)
NOISE FIGURE (dB)
0 1.0 1.50.5 2.0 2.5 3.0
620MHz
RF_AGC = 2.85V
T
A
= +25°C
T
A
= -40°C
T
A
= +55°C
T
A
= +85°C
0
10
5
15
30
35
25
20
40
100 300 400 500 600200 700 800 900 1000
RF PORT-TO-PORT ISOLATION
MAX3580 toc18
FREQUENCY (MHz)
GAIN (dB)
RFIN2 TO RFIN
RFIN TO RFIN2
4
3
2
1
0
-60 -30-50 -40 -20 -10 0
POWER-DETECTOR OUTPUT VOLTAGE
vs. RF INPUT POWER
MAX3580 tpc19
RF INPUT POWER (dBm)
POWER-DETECTOR OUTPUT VOLTAGE (V)
10kΩ PULLUP TO 3.0V
"111"
"000"
0
-5
-10
-15
450 675525 600 750 825 900
RF INPUT RETURN LOSS
vs. UHF FREQUENCY
MAX3580 toc20
UHF FREQUENCY (MHz)
RETURN LOSS (dB)
Zo = 75Ω
Typical Operating Characteristics (continued)
(Typical values are at V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
0
-5
-10
-15
-20
150 200175 225 250
RF INPUT RETURN LOSS
vs. VHF FREQUENCY
MAX3580 toc21
VHF FREQUENCY (MHz)
RETURN LOSS (dB)
Zo = 75Ω
200
195
190
185
3.0 3.33.1 3.2 3.4 3.5 3.6
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX3580 toc22
V
CC
(V)
I
CC
(mA)
T
A
= +55°C
T
A
= +85°C
T
A
= -40°C
T
A
= 0°C
T
A
= +25°C