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Complete Direct-Conversion L-Band Tuner
AC ELECTRICAL CHARACTERISTICS
(MAX2121 Evaluation Kit: V CC = +3.13V to +3.47V, T A = -40°C to +85°C, default register settings except BBG[3:0] = 1111. Typical
values measured at V CC = +3.3V, T A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAIN SIGNAL PATH PERFORMANCE
Minimum Gain
f IN = 2175MHz
72
78
dB
Gain Flatness
Input Frequency Range
925MHz to 2175MHz (Note 2)
(Note 3)
925
4
6
2175
dB
MHz
RF Gain-Control Range (GC1)
Baseband Gain-Control Range
In-Band Input IP3
Out-of-Band Input IP3
Input IP2
0.5V < V GC1 < 2.7V
Bits BBG[3:0] = 1111 to 0000
(Note 4)
(Note 5)
(Note 6)
65
11.5
73
13.5
+2
+15
+40
dB
dB
dBm
dBm
dBm
V GC1 is set to 0.5V (maximum RF gain) and BBG[3:0]
is adjusted to give a 1V P-P baseband output level for a
8
Noise Figure
-75dBm CW input tone at 1500MHz
dB
Starting with the same BBG[3:0] setting as above,
V GC1 is adjusted to back off RF gain by 10dB (Note 2)
9
12
Minimum RF Input Return Loss
925MHz < f RF < 2175MHz, in 75
system
12
dB
BASEBAND OUTPUT CHARACTERISTICS
Nominal Output Voltage Swing
I/Q Amplitude Imbalance
I/Q Quadrature Phase Imbalance
Single-Ended I/Q Output
Impedance
Output 1dB Compression Voltage
Baseband Highpass -3dB
Frequency Corner
R LOAD = 200 //5pF
Measured at 500kHz
Measured at 500kHz
Real Z O , from 1MHz to 140MHz
Differential
47nF capacitors at IDC_, QDC_
0.5
1
24
3
400
±1
3.5
V P-P
dB
Degrees
V P-P
Hz
BASEBAND LOWPASS FILTERS (5th-Order Butterworth with 1st-Order Group Delay Compensation)
Filter Bandwidth (-3dB)
123.75
MHz
Rejection Ratio
Group Delay
3dB Bandwidth Tolerance
At 247.5MHz
Up to 0.5dB bandwidth
31
1.0
±10
dB
ns
%
FREQUENCY SYNTHESIZER
RF-Divider Frequency Range
RF-Divider Range (N)
Reference-Divider Frequency
Range
Reference-Divider Range (R)
Phase-Detector Comparison
Frequency
925
19
12
1
12
2175
251
30
1
30
MHz
MHz
MHz
3
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