Datasheet
MAX19985A
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
_______________________________________________________________________________________ 5
+3.3V SUPPLY AC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, RF and LO ports are driven from 50Ω sources. Typical values are at V
CC
= +3.3V, P
RF
= -5dBm,
P
LO
= 0dBm, f
RF
= 900MHz, f
LO
= 1100MHz, f
IF
= 200MHz, T
C
=+25°C, unless otherwise noted.) (Note 6)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Conversion Power Gain G
C
8.7 dB
Conversion Power Gain Variation
vs. Frequency
ΔG
C
Flatness over any one of three frequency
bands:
f
RF
= 824MHz to 849MHz,
f
RF
= 869MHz to 894MHz,
f
RF
= 880MHz to 915MHz
0.15
dB
G ai n V ar i ati on Over Tem p er atur eTC
G
T
C
= -40°C to +85°C
-0.012
dB/°C
Noise Figure NF 9.0 dB
Noise Figure Temperature
Coefficient
TC
NF
T
C
= -40°C to +85°C
0.018
dB/°C
Input 1dB Compression Point IP
1dB
10.6
dBm
Third-Order Input Intercept Point
IIP3
f
RF1
= 900MHz, f
RF2
= 901MHz,
f
IF
= 200MHz, P
RF
= -5dBm/tone
24.7
dBm
P
RF
= -10dBm
-74.9
2LO-2RF Spur Rejection 2 x 2
f
RF
= 800MHz,
f
LO
= 1000MHz,
f
SPUR
= 900MHz
P
RF
= -5dBm
-69.9
dBc
P
RF
= -10dBm -78
3LO-3RF Spur Rejection 3 x 3
f
RF
= 800MHz,
f
LO
= 1000MHz,
f
SPUR
= 933.333MHz
P
RF
= -5dBm -73
dBc
Maximum LO Leakage at RF Port
f
LO
= 900MHz to 1300MHz, P
LO
= +3dBm -40
dBm
M axi m um 2LO Leakag e at RF P or t
f
LO
= 900MHz to 1300MHz, P
LO
= +3dBm -42
dBm
Maximum LO Leakage at IF Port
f
LO
= 900MHz to 1300MHz, P
LO
= +3dBm -34
dBm
Minimum RF-to-IF Isolation f
RF
= 824MHz to 915MHz 38 dB
LO-to-LO Isolation
P
LO1
= +3dBm, P
LO2
= +3dBm,
f
LO1
= 900MHz, f
LO2
= 901MHz (Note 8)
45 dB
Channel-to-Channel Isolation
RFM AIN ( RFD IV ) conver ted p ow er m easur ed
at IFD IV ( IFM AIN ) , r el ati ve to IFM AIN ( IFD IV ) ,
al l unused p or ts ter m i nated to 50Ω
48 dB
LO Switching Time 50% of LOS E L to IF settl ed w i thi n 2 d eg r ees 50 ns
RF Input Impedance Z
RF
50 Ω
RF Input Return Loss
LO on and IF terminated into matched
impedance
21 dB
LO Input Impedance Z
LO
50 Ω
RF and IF terminated into matched
impedance, LO port selected
31
LO Input Return Loss
RF and IF terminated into matched
impedance, LO port unselected
24
dB