Rainbow Electronics MAX2105 - Manual (Page 7)

MAX2102/MAX2105
Direct-Conversion Tuner ICs for
Digital DBS Applications
_______________________________________________________________________________________ 7
-200
-150
-100
-50
0
50
100
0.8 1.1 1.4 1.7 2.0 2.3
LO PORT IMPEDANCE vs. FREQUENCY
(UNMATCHED)
MAX2102/05-08
FREQUENCY (GHz)
SERIES IMPEDANCE (
Ω
) REAL
IMAGINARY
0
20
10
40
30
50
60
-10 -20 -25 -15 -30 -35 -40
IM3 LEVELS vs. INPUT CARRIER
POWER LEVEL
MAX2102/05-09
SINGLE INPUT CARRIER LEVEL (dBm)
IM3 LEVEL (dBc)
T A = +70°C
T A = +25°C
T A = 0°C
f1 = 2148.1MHz
f2 = 2149MHz
f
LO = 2151MHz
AGC SET VIA SERVO LOOP
FOR 0.5V PER TONE
0
20
10
40
50
30
60
70
-10 -20 -25 -15 -30 -35 -40
IM3 LEVELS vs. INPUT CARRIERS
POWER LEVEL
MAX2102/05-11
SINGLE INPUT CARRIER LEVEL (dBm)
IM3 LEVEL (dBc)
T A = +70°C
T A = +25°C
T A = 0°C
f1 = 1448.1MHz
f2 = 1449MHz
f
LO
= 1451MHz
AGC SET VIA SERVO LOOP
FOR 0.5Vp-p PER TONE
Typical Operating Characteristics (continued)
(MAX2102 EV kit circuit (Figure 1), V CC = 5V, PSGND = open, MOD = GND, f RFIN = 2150MHz, P RFIN = -19dBm, f LO = 2150.125MHz,
P LO = -15dBm driven single-ended into LO, AGC set via servo loop for V IOUT = V QOUT = 0.5Vp-p, IOUT, QOUT drive AC-coupled
100
Ω
loads, 2k
Ω
from PSOUT to GND, T A = +25°C, unless otherwise noted.)
-40
0
-20
40
20
80
60
REAL
100
0.8 1.1 1.4 1.7 2.0 2.3
LO PORT IMPEDANCE vs. FREQUENCY
MAX2102/05-10
FREQUENCY (GHz)
SERIES IMPEDANCE (
Ω
)
MATCHED: MAX2102 TYPICAL
OPERATING CIRCUIT
IMAGINARY
-100
-60
-80
-20
-40
20
0
40
80
60
100
0.8 1.1 1.4 1.7 2.0 2.3
RFIN PORT IMPEDANCE
vs. FREQUENCY
MAX2102/05-12
FREQUENCY (GHz)
SERIES IMPEDANCE (
Ω
)
REAL
IMAGINARY
MATCHED PER
EV KIT CIRCUIT
-100
-80
-90
-60
-70
-40
-50
-30
0.8 1.4 1.1 1.7 2.0 2.3
LO LEAKAGE AT RFIN vs. FREQUENCY
(SINGLE-ENDED LO DRIVE)
MAX2102/05-13
FREQUENCY (GHz)
LO POWER AT RFIN (dBm)
P LO = -15dBm
P LO = -5dBm
P LO = -10dBm
-100
-80
-90
-60
-70
-40
-50
-30
0.8 1.4 1.1 1.7 2.0 2.3
LO LEAKAGE AT RFIN vs. FREQUENCY
(DIFFERENTIAL LO DRIVE)
MAX2102/05-14
FREQUENCY (GHz)
LO POWER AT RFIN (dBm)
AGC SET FOR P
RFIN
= -69dBm
P LO REFERS TO POWER INTO
LO AND LO
P LO = -15dBm
P
LO
= -5dBm
P LO = -10dBm
-36
-34
-35
-32
-33
-31
-30
-20 -15 -10 -5
SPURIOUS DOWNCONVERSION DUE TO
INTERNALLY GENERATED LO 2ND HARMONIC
MAX2102/05-15
LO POWER (dBm)
SPURIOUS SIGNAL LEVEL NORMALIZED TO LEVEL WHEN F
RFIN
= 1074.5MHz (dBc)
f LO = 1075.5MHz
f RFIN = 2150MHz
P RFIN = -69dBm
LO DRIVEN
SINGLE ENDED
LO, LO DRIVEN DIFFERENTIAL
(P
LO = -15dBm, P LO = -15dBm)