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Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2120 Evaluation Kit: V CC = +3.13V to +3.47V, V GC1 = +0.5V (max gain), T A = 0°C to +70°C. Default register settings except
BBG[3:0] = 1011. Typical values measured at V CC = +3.3V, T A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOLTAGE-CONTROLLED OSCILLATOR AND LO GENERATION
Guaranteed LO Frequency
Range
T A = 0°C to +70°C
925
2175
MHz
f OFFSET = 10kHz
-82
LO Phase Noise
f OFFSET = 100kHz
f OFFSET = 1MHz
-102
-122
dBc/Hz
XTAL/REFERENCE OSCILLATO R INPUT AND OUTPUT BUFFER
XTAL Oscillator Frequency
Range
Parallel-resonance-mode crystal (Note 8)
4
8
MHz
Input Overdrive Level
AC-coupled sine wave input
0.5
1
2.0
V P-P
XTAL Output-Buffer Divider
Range
1
8
XTAL Output Voltage Swing
4MHz to 30MHz, C LOAD = 10pF
1
1.5
2
V P-P
XTAL Output Duty Cycle
50
%
Note 1: Min/max values are production tested at T A = +70°C. Min/max limits at T A = 0°C and T A = +25°C are guaranteed by design
and characterization.
Note 2: Gain-control range specifications met over this band.
Note 3: In-band IIP3 test conditions: GC1 set to provide the nominal baseband output drive when mixing down a -23dBm tone at
2175MHz to 5MHz baseband (f LO = 2170MHz). Baseband gain is set to its default value (BBG[3:0] = 1011). Two tones at
-26dBm each are applied at 2174MHz and 2175MHz. The IM3 tone at 3MHz is measured at baseband, but is referred to the
RF input.
Note 4: Out-of-band IIP3 test conditions: GC1 set to provide nominal baseband output drive when mixing down a -23dBm tone at
2175MHz to 5MHz baseband (f LO = 2170MHz). Baseband gain is set to its default value (BBG[3:0] = 1011). Two tones at
-20dBm each are applied at 2070MHz and 1975MHz. The IM3 tone at 5MHz is measured at baseband, but is referred to the
RF input.
Note 5: Input IP2 test conditions: GC1 set to provide nominal baseband output drive when mixing down a -23dBm tone at 2175MHz
to 5MHz baseband (f LO = 2170MHz). Baseband gain is set to its default value (BBG[3:0] = 1011). Two tones at -20dBm
each are applied at 925MHz and 1250MHz. The IM2 tone at 5MHz is measured at baseband, but is referred to the RF input.
Note 6: Adjacent channel protection test conditions: GC1 is set to provide the nominal baseband output drive with a 2110MHz
27.5Mbaud signal at -55dBm. GC2 set for mid-scale. The test signal will be set for PR = 7/8 and SNR of -8.5dB. An adjacent
channel at ±40MHz is added at -25dBm. DVB-S BER performance of 2E-4 will be maintained for the desired signal. GC2
may be adjusted for best performance.
Note 7: Guaranteed by design and characterization at T A = +25°C.
Note 8: See Table 14 for crystal ESR requirements.
4
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