The MAX19995 dual-channel downconverter provides
9dB of conversion gain, +24.8dBm input IP3,
+13.3dBm 1dB input compression point, and a noise
figure as low as 9dB for 1700MHz to 2200MHz diversity
receiver applications. With an optimized LO frequency
range of 1400MHz to 2000MHz, this mixer is ideal for
low-side LO injection architectures. High-side LO injection is supported by the MAX19995A, which is pin-pin
and functionally compatible with the MAX19995.
In addition to offering excellent linearity and noise performance, the MAX19995 also yields a high level of
component integration. This device includes two double-balanced passive mixer cores, two LO buffers, a
dual-input LO selectable switch, and a pair of differential IF output amplifiers. Integrated on-chip baluns allow
for single-ended RF and LO inputs.
The MAX19995 requires a nominal LO drive of 0dBm
and a typical supply current of 297mA at VCC= 5.0V or
212mA at V
CC
= 3.3V.
The MAX19995/MAX19995A are pin compatible with
the MAX19985/MAX19985A series of 700MHz to
1000MHz mixers and pin similar with the MAX19997A/
MAX19999 series of 1800MHz to 4000MHz mixers,
making this entire family of downconverters ideal for
applications where a common PCB layout is used
across multiple frequency bands.
The MAX19995 is available in a 6mm x 6mm, 36-pin
thin QFN package with an exposed pad. Electrical performance is guaranteed over the extended temperature
range, from TC= -40°C to +85°C.
Applications
UMTS/WCDMA/LTE Base Stations
cdma2000®Base Stations
DCS1800 and EDGE Base Stations
PCS1900 and EDGE Base Stations
PHS/PAS Base Stations
Fixed Broadband Wireless Access
Wireless Local Loop
Private Mobile Radios
Military Systems
Features
♦ 1700MHz to 2200MHz RF Frequency Range
♦ 1400MHz to 2000MHz LO Frequency Range
♦ 1750MHz to 2700MHz LO Frequency Range
(MAX19995A)
♦ 50MHz to 500MHz IF Frequency Range
♦ 9dB Typical Conversion Gain
♦ 9dB Typical Noise Figure
♦ +24.8dBm Typical Input IP3
♦ +13.3dBm Typical Input 1dB Compression Point
♦ 79dBc Typical 2RF-2LO Spurious Rejection at
P
RF
= -10dBm
♦ Dual Channels Ideal for Diversity Receiver
Applications
♦ 49dB Typical Channel-to-Channel Isolation
♦ Low -3dBm to +3dBm LO Drive
♦ Integrated LO Buffer
♦ Internal RF and LO Baluns for Single-Ended
Inputs
♦ Built-In SPDT LO Switch with 56dB LO-to-LO
Isolation and 50ns Switching Time
♦ Pin Compatible with the MAX19985/MAX19985A/
MAX19995A Series of 700MHz to 2200MHz Mixers
♦ Pin Similar to the MAX19997A/MAX19999 Series
of 1800MHz to 4000MHz Mixers
♦ Single +5.0V or +3.3V Supply
♦ External Current-Setting Resistors Provide Option
for Operating Device in Reduced-Power/ReducedPerformance Mode
optimized for the DCS/PCS band, VCC= +4.75V to +5.25V, TC= -40°C to +85°C. R1 = R4 = 806Ω, R2 =
R5 = 2.32kΩ. Typical values are at V
CC
= +5.0V, TC= +25°C, unless otherwise noted. All parameters are production tested.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Based on junction temperature TJ= TC+ (θJCx VCCx ICC). This formula can be used when the temperature of the exposed
pad is known while the device is soldered down to a PCB. See the
Applications Information
section for details. The junction
temperature must not exceed +150°C.
Note 2: Junction temperature T
J
= TA+ (θJAx VCCx ICC). This formula can be used when the ambient temperature of the PCB is
known. The junction temperature must not exceed +150°C.
Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Note 4: TCis the temperature on the exposed pad of the package. TA is the ambient temperature of the device and PCB.
V
CC
to GND...........................................................-0.3V to +5.5V
LO1, LO2 to GND ...............................................................±0.3V
Any Other Pins to GND...............................-0.3V to (V
CC
+ 0.3V)
RFMAIN, RFDIV, and LO_ Input Power ..........................+15dBm
RFMAIN, RFDIV Current (RF is DC shorted to GND
through a balun)...............................................................50mA
Continuous Power Dissipation (Note 1) ...............................8.7W
Note 5: Not production tested. Operation outside this range is possible, but with degraded performance of some parameters. See
the
Typical Operating Characteristics
.
Note 6: All limits reflect losses of external components, including a 0.65dB loss at f
IF
= 190MHz due to the 4:1 impedance trans-
former. Output measurements were taken at IF outputs of the
Typical Application Circuit
.
Note 7: Maximum reliable continuous input power applied to the RF or IF port of this device is +12dBm from a 50Ω source.
Note 8: Guaranteed by design and characterization.
Note 9: Measured with external LO source noise filtered so the noise floor is -174dBm/Hz. This specification reflects the effects of
all SNR degradations in the mixer, including the LO noise as defined in Application Note 2021:
Specifications and
Measurement of Local Oscillator Noise in Integrated Circuit Base Station Mixers.
Note 10: Limited production testing.
Input Compression PointIP
Input Intercept PointIIP3f
Input Intercept Variation Over
Temperature
Noise FigureNF
Noise Figure Temperature
Coefficient
2RF-2LO Spur Rejection2 x 2
3RF-3LO Spur Rejection3 x 3
RF Input Return LossLO on and IF terminated21dB
LO Input Return Loss
IF Return Loss
RF-to-IF Isolation42dB
LO Leakage at RF Port-40dBm
2LO Leakage at RF Port-29dBm
LO Leakage at IF Port-43dBm
Channel Isolation
LO-to-LO Isolation
LO Switching Time50% of LO S E L to IF settl ed w i thi n 2 d eg r ees50ns
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
1dB
TC
TC
(Note 7)8.9dBm
- f
RF1
IIP3fRF1
Single sideband, no blockers present9.0dB
SSB
Single sideband, no blockers present,
NF
T
C
PRF = -10dBm73
P
RF
PRF = -10dBm70
P
RF
LO port selected, RF and IF terminated into
matched impedance
LO port unselected, RF and IF terminated
into matched impedance
RF terminated into 50Ω, LO driven by 50Ω
source, IF transformed to 50Ω using
external components shown in TypicalApplication Circuit, f
RFMAIN converted power measured at
IFD_, relative to IFM_, all unused ports
terminated to 50Ω
RFDIV converted power measured at IFM_,
relative to IFD_, all unused ports terminated
to 50Ω
P
LO1
f
LO1
= 1MHz18.5dBm
RF2
- f
= 1MHz, TC = -40°C to +85°C0.0034dBm/°C
RF2
= -40°C to +85°C
= -5dBm68
= -5dBm60
= 190MHz
IF
= +3dBm, P
= 1610MHz, f
= +3dBm,
LO2
= 1611MHz
LO2
0.016dB/°C
16
20
12.5dB
49
49
55dB
dBc
dBc
dB
dB
MAX19995
Dual, SiGe, High-Linearity, 1700MHz to 2200MHz
Downconversion Mixer with LO Buffer/Switch