Complete DBS Direct-Conversion Tuner ICs
with Monolithic VCOs
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2116/MAX2118 EV kits, V
= +4.75V to +5.25V, GC1 and GC2 set for maximum gain, GND = 0V, IOUT = QOUT = 800mV
CC
P-P
(MAX2116), loaded with 1kΩ IOUT = QOUT = 590mV
differential (DL = 0, MAX2118), IOUT = QOUT = 1V
differential (DL
P-P
P-P
= 1, MAX2118), loaded with differential 2kΩ. Baseband LPF BW = 33MHz, f
= 2175MHz. For default register values, see the
RFIN
Serial Interface and Control Registers section. T = +25°C to +85°C. Typical values are at V
= +5V, T = +25°C, unless otherwise
A
CC
A
noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
GC1 = 0.75V (max gain), bit DL = 1,
bits GC2(4) - GC2(0) = 00000 (max gain)
-77
-72
Input Carrier Levels Necessary to Produce
for output ≥ 800mV
P-P
1V
(Differential) at I/Q Baseband Outputs
dBm
P-P
GC1 = 2.6V (min gain), bit DL = 1,
bits GC2(4) - GC2(0) = 11111 (min gain),
(MAX2118)
3
16
-77
16
for output ≤ 800mV
P-P
GC1 = 0.75V (max gain), bit DL = 0,
bits GC2(4) - GC2(0) = 00000 (max gain),
-72
Input Carrier Levels Necessary to Produce
for output ≥ 800mV
P-P
590mV
(Differential) at I/Q Baseband
dBm
P-P
GC1 = 2.6V (min gain), bit DL = 0,
bits GC2(4) - GC2(0) = 11111 (min gain),
Outputs (MAX2118)
3
for output ≤ 800 mV
P-P
RF Gain Control (GC1) Range
0.75V < GC1 < 2.6V
60
19
69
24
10
22
dB
dB
Baseband Gain Control (GC2) Range
Bits GC2(4) - GC2(0) = 00000 to 11111
IIP3
IIP2
(Note 5)
(Note 6)
dBm
dBm
GC1 = 0.75V (max gain), bits GC2(4) - GC2(0)
= 00000 (max gain)
NF
10.5
dB
Minimum RF Input Return Loss
Maximum LO Leakage at RFIN
75Ω input source, 925MHz < f
< 2175MHz
13.5
-80
dB
RFIN
925MHz < f < 2175MHz
-63
dBm
LO
Unwanted in 925MHz to 2175MHz band
Unwanted = 2250MHz
33
30
50
LO-Generated RFIN Second Harmonic
Rejection
45
dB
Unwanted above 2250MHz
6dB/oct
BASEBAND OUTPUTS
Baseband I/Q Output Impedance
Baseband Highpass -3dB Point
Quadrature Phase Error
Single ended, real Z
30
Ω
Hz
OUT
0.1µF capacitors at IDC , QDC
125kHz baseband test tone
125kHz baseband test tone
Baseband -3dB cutoff frequency
Fc = 4MHz
850
4
Degrees
dB
Quadrature Gain Error
1.2
33
Baseband Lowpass BW Range
4
MHz
ꢀ
-5.5
-10
+5.5
+10
LP Filter BW Accuracy
Fc = 33MHz (Note 7)
ꢀ
Ratio of In-Filter-Band to Out-of-Filter-Band
Noise
Finband = 100Hz to 22.5MHz,
Foutband = 87.5MHz to 112.5MHz
25
dB
4
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