Direct-Conversion Tuner IC
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V; PS_SEL = 0.5V; P
RFIN
= -20dBm; f
LO
= f
RFIN
+125kHz; GC set via servo loop for V
IOUT
- V
IOUT
= 200mVp-p (differen-
tial); T
A
= +25°C; unless otherwise noted.)
PARAMETER
Prescaler Divide Ratio
Differential Prescaler Output
Swing
I/Q Channel Quadrature
Phase Error (Note 2)
I/Q Amplitude Mismatch
(Note 2)
I/Q Channel Clipping Level
Baseband Bandwidth
I/Q Channel Differential
Output Impedance
V
PSOUT -
V
PSOUT
SYMBOL
V
PS_SEL
> 2.4V
V
PS_SEL
< 0.5V
C
PSOUT
= C
PSOUT
= 10pF to GND
f
IOUT
= f
IOUT
= f
QOUT
= f
QOUT
= 125kHz
f
IOUT
= f
IOUT
= f
QOUT
= f
QOUT
= 125kHz
f
IOUT
= f
IOUT
= f
QOUT
= f
QOUT
= 10MHz,
no output load
At -3dB attenuation
f
IOUT
= f
IOUT
= f
QOUT
= f
QOUT
= 20MHz
1.4
150
33
CONDITIONS
MIN
32
33
1.0
3
1
TYP
MAX
32
33
V
P-P
degrees
dB
V
P-P
MHz
Ω
UNITS
MAX2108
Note 1:
AC specifications with minimum/maximum limits are met within this frequency range.
Note 2:
LO and
LO
are differentially driven through an AC-coupled matching network.
Note 3:
P
RFIN
= -20dBm per tone, GC set via servo loop for V
IOUT
- V
IOUT
= 20mVp-p per tone. f1
RFIN
= 1749MHz, f2
RFIN
=
1751MHz, f
LO
= 1740MHz.
Note 4:
P
RFIN
= -20dBm per tone, GC set via servo loop for V
IOUT
- V
IOUT
= 20mVp-p per tone. f1
RFIN
= 1200MHz, f2
RFIN
=
2150MHz, f
LO
= 951MHz.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2108 toc01
CARRIER LEVEL vs. GAIN CONTROL
MAX2108 toc02
INPUT IP3 vs. FREQUENCY
MAX2108 toc03
125
120
115
I
CC
(mA)
110
105
T
A
= +25°C
100
95
90
4.75
4.85
4.95
5.05
5.15
T
A
= 0°C
T
A
= +70°C
0
-10
-20
RF LEVEL (dBm)
f
RFIN
= 1750 MHz
-40
-50
-60
-70
-80
GC SET FOR 10mV
P-P
BASEBAND OUTPUT
10
8
IIP3 (dBm)
-30
6
4
TWO-TONE FREQUENCY
SPACING EQUALS 2MHz
2
0
1
1.5
2
2.5
3
3.5
900
1100
1300
1500
1700
GC VOLTAGE (V)
RF FREQUENCY (MHz)
5.25
V
CC
(V)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
