Rainbow Electronics MAX19998 User Manual
19-4827; Rev 0; 10/09
EVALUATION KIT
AVAILABLE
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
General Description
The MAX19998 single, high-linearity downconversion
mixer provides 8.7dB of conversion gain, +24.3dBm
input IP3, +11.3dBm 1dB input compression point,
and a noise figure of 9.7dB for 2300MHz to 4000MHz
WiMAXK, LTE, and MMDS receiver applications. With
an ultra-wide LO 2600MHz to 4300MHz frequency
range, the MAX19998 can be used in either low-side
or high-side LO injection architectures for virtually all
2.5GHz and 3.5GHz applications. For a 2.5GHz variant tuned specifically for high-side injection, refer to the
MAX19996A.
In addition to offering excellent linearity and noise performance, the MAX19998 also yields a high level of
component integration. This device includes a doublebalanced passive mixer core, an IF amplifier, and an LO
buffer. On-chip baluns are also integrated to allow for
single-ended RF and LO inputs. The MAX19998 requires
a nominal LO drive of 0dBm, and supply current is typically 230mA at VCC = 5.0V or 150mA at VCC = 3.3V.
The MAX19998 is pin compatible with the MAX19996/
MAX19996A 2000MHz to 3900MHz mixer family. The
device is also pin similar with the MAX9984/MAX9986/
MAX9986A 400MHz to 1000MHz mixers and the
MAX9993/MAX9994/MAX9996 1700MHz to 2200MHz
mixers, making this entire family of downconverters ideal
for applications where a common PCB layout is used for
multiple frequency bands.
The MAX19998 is available in a compact, 5mm x 5mm,
20-pin thin QFN with an exposed pad. Electrical performance is guaranteed over the extended -40NC to +85NC
temperature range.
Applications
2.5GHz WiMAX and LTE Base Stations
2.7GHz MMDS Base Stations
3.5GHz WiMAX and LTE Base Stations
Fixed Broadband Wireless Access
Wireless Local Loop
Private Mobile Radios
Military Systems
Features
S 2300MHz to 4000MHz RF Frequency Range
S 2600MHz to 4300MHz LO Frequency Range
S 50MHz to 500MHz IF Frequency Range
S 8.7dB Conversion Gain
S 9.7dB Noise Figure
S +24.3dBm Typical Input IP3
S +11.3dBm Typical Input 1dB Compression Point
S 67dBc Typical 2RF - 2LO Spurious Rejection at
PRF = -10dBm
S Integrated LO Buffer
S Integrated RF and LO Baluns for Single-Ended
Inputs
S Low -3dBm to +3dBm LO Drive
S Pin Compatible with the MAX19996/MAX19996A
2000MHz to 3900MHz Mixers
S Pin Similar with the MAX9984/MAX9986/
MAX9986A Series of 400MHz to 1000MHz Mixers
and the MAX9993/MAX9994/MAX9996 Series of
1700MHz to 2200MHz Mixers
S Single 5.0V or 3.3V Supply
S External Current-Setting Resistors Provide Option
for Operating Device in Reduced-Power/ReducedPerformance Mode
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX19998ETP+
MAX19998ETP+T
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape and reel.
-40NC to +85NC
-40NC to +85NC
20 Thin QFN-EP*
20 Thin QFN-EP*
MAX19998
WiMAX is a trademark of WiMAX Forum.
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..........................................................-0.3V to +5.5V
IF+, IF-, LOBIAS, IFBIAS to GND ............. -0.3V to (VCC + 0.3V)
RF, LO Input Power .......................................................+12dBm
RF, LO Current
(RF and LO is DC shorted to GND through balun) ........50mA
Continuous Power Dissipation (Note 1) ................................. 5W
Note 1: Based on junction temperature TJ = TC + (BJC x VCC x ICC). This formula can be used when the temperature of the
MAX19998
Note 2: Junction temperature TJ = TA + (BJA x VCC x ICC). This formula can be used when the ambient temperature of the PCB is
Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
Note 4: TC is the temperature on the exposed pad of the package. TA is the ambient temperature of the device and PCB.
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.
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 +150NC.
known. The junction temperature must not exceed +150NC.
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
5.0V SUPPLY DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, no input RF or LO signals. TC = -40NC to +85NC, unless
otherwise noted. Typical values are at VCC = 5.0V, TC = +25NC, all parameters are production tested.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
Supply Current I
CC
CC
Total supply current 230 247 mA
BJA (Notes 2, 3) ............................................................ +38NC/W
B
(Notes 1, 3) ............................................................ +13NC/W
JC
Operating Case Temperature Range
(Note 4) .................................................. TC = -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
4.75 5.0 5.25 V
3.3V SUPPLY DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, R1 = 845ω, R2 = 1.1kω, VCC = 3.0V to 3.6V, no input RF or LO signals. TC = -40NC to +85NC, unless oth-
erwise noted. Typical values are at VCC = 3.3V, TC = +25NC, parameters are guaranteed by design, unless otherwise noted.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
Supply Current I
CC
CC
Total supply current 150 mA
3.0 3.3 3.6 V
RECOMMENDED AC OPERATING CONDITIONS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF Frequency Range f
LO Frequency f
IF Frequency f
LO Drive P
2 ______________________________________________________________________________________
RF
LO
(Notes 5, 6) 2300 4000 MHz
(Notes 5, 6) 2600 4300 MHz
Using a Mini-Circuits TC4-1W-17 4:1
transformer as defined in the Typical
Application Circuit, IF matching components
affect the IF frequency range (Notes 5, 6)
IF
Using a Mini-Circuits TC4-1W-7A 4:1
transformer as defined in the Typical
Application Circuit, IF matching components
affect the IF frequency range (Notes 5, 6)
LO
100 500
50 250
-3 0 +3 dBm
MHz
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz,
LOW-SIDE LO INJECTION
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports
are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 2800MHz to
3600MHz, fRF > fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF = 3500MHz,
fLO = 3200MHz, fIF = 300MHz. All parameters are guaranteed by design and characterization, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Small-Signal Conversion Gain G
Gain Variation vs. Frequency
Conversion Gain Temperature
Coefficient
Input 1dB Compression Point IP
Third-Order Input Intercept Point IIP3
IIP3 Variation with T
Single-Sideband Noise Figure NF
Noise Figure Temperature
Coefficient
Noise Figure Under Blocking NF
2RF - 2LO Spur Rejection 2 x 2 f
3RF - 3LO Spur Rejection 3 x 3 f
RF Input Return Loss RL
LO Input Return Loss RL
IF Output Impedance Z
IF Output Return Loss RL
C
DG
TC
TC
C
C
CG
1dB
SSB
NF
B
RF
LO
IF
IF
TC = +25NC (Notes 8, 9)
fRF = 3100MHz to 3900MHz, any 100MHz
band
fRF = 3100MHz to 3900MHz, any 200MHz
band
fRF = 3100MHz to 3900MHz,
TC = -40NC to +85NC
(Note 10) 10.0 11.4 dBm
f
- f
RF1
TC = +25NC (Note 9)
fRF = 3100MHz to 3900MHz, f
P
RF1
No blockers present (Note 5) 9.7 12.5
No blockers present, TC = +25NC (Note 5)
Single sideband, no blockers present,
TC = -40NC to +85NC
+8dBm blocker tone applied to RF port,
fRF = 3500MHz, fLO = 3200MHz,
f
BLOCKER
VCC = +5.0V, TC = +25NC (Notes 5, 11)
SPUR
SPUR
LO on and IF terminated into a matched
impedance
RF and IF terminated into a matched
impedance
Nominal differential impedance at the IC’s IF
outputs
RF terminated into 50I, LO
driven by 50I source, IF
transformed to 50I using
external components shown
in the Typical Application
Circuit. See the Typical
Operating Characteristics
for performance vs. inductor
values.
= 1MHz, P
RF2
= P
= -5dBm/tone, TC = -40NC to +85NC
RF2
= 3750MHz, PLO = 0dBm,
= fLO + 150MHz
= fLO + 100MHz
= P
RF1
= -5dBm/tone,
RF2
- f
RF2
= 1MHz,
RF1
PRF = -10dBm (Note 5) 63 67
PRF = -5dBm (Note 9) 58 62
PRF = -10dBm (Note 5) 80 85
PRF = -5dBm (Note 9) 70 75
fIF = 450MHz,
L1 = L2 = 120nH
fIF = 350MHz,
L1 = L2 = 270nH
fIF = 300MHz,
L1 = L2 = 390nH
7.6 8.7 9.4 dB
0.15
dB
0.3
-0.01
22 24.3 dBm
Q0.2
9.7 11.0
0.018
21 25 dB
25 dB
16 dB
200
20
20
20
dB/NC
dBm
dB
dB/NC
dBc
dBc
I
dB
MAX19998
_______________________________________________________________________________________ 3
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz,
LOW-SIDE LO INJECTION (continued)
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports
are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 2800MHz to
3600MHz, fRF > fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF = 3500MHz,
fLO = 3200MHz, fIF = 300MHz. All parameters are guaranteed by design and characterization, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF-to-IF Isolation fRF = 3500MHz, PLO = +3dBm (Note 9) 27 29.5 dB
MAX19998
LO Leakage at RF Port
2LO Leakage at RF Port PLO = +3dBm -29 dBm
LO Leakage at IF Port PLO = +3dBm (Note 9) -22 dBm
3.3V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz,
LOW-SIDE LO INJECTION
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 845ω, R2 = 1.1kω, RF and LO ports are driven from 50I
sources, fRF > fLO. Typical values are for TC = +25NC, VCC = 3.3V, PRF = -5dBm, PLO = 0dBm, fRF = 3500MHz, fLO = 3200MHz, fIF
= 300MHz, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Small-Signal Conversion Gain G
Gain Variation vs. Frequency
Conversion Gain Temperature
Coefficient
Input 1dB Compression Point IP
Third-Order Input Intercept Point IIP3 f
IIP3 Variation with T
Single-Sideband Noise Figure NF
Noise Figure Temperature
Coefficient
2RF - 2LO Spur Rejection 2 x 2 f
3RF - 3LO Spur Rejection 3 x 3 f
RF Input Return Loss RL
LO Input Return Loss RL
IF Output Impedance Z
C
DG
TC
TC
fLO = 2800MHz to 3600MHz, PLO = +3dBm
(Note 9)
C
fRF = 3100MHz to 3900MHz, any 100MHz
C
band
fRF = 3100MHz to 3900MHz,
CG
TC = -40NC to +85NC
(Note 10) 7.7 dBm
1dB
- f
RF1
f
RF1
TC = -40NC to +85NC
No blockers present 9.3 dB
SSB
Single sideband, no blockers present,
NF
TC = -40NC to +85NC
SPUR
SPUR
LO on and IF terminated into a matched
RF
impedance
RF and IF terminated into a matched imped-
LO
ance
Nominal differential impedance at the IC’s IF
IF
outputs
= 1MHz, P
RF2
- f
= 1MHz, P
RF2
= fLO + 150MHz
= fLO + 100MHz
= P
RF1
RF1
= -5dBm/tone 20.1 dBm
RF2
= P
= -5dBm/tone,
RF2
PRF = -10dBm 64
PRF = -5dBm 59
PRF = -10dBm 74
PRF = -5dBm 64
-26 dBm
8.4 dB
0.15 dB
-0.01
Q0.2
0.018
30 dB
20 dB
200
dB/NC
dB
dB/NC
dBc
dBc
I
4 ______________________________________________________________________________________
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
3.3V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz,
LOW-SIDE LO INJECTION (continued)
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 845ω, R2 = 1.1kω, RF and LO ports are driven from 50I
sources, fRF > fLO. Typical values are for TC = +25NC, VCC = 3.3V, PRF = -5dBm, PLO = 0dBm, fRF = 3500MHz, fLO = 3200MHz, fIF
= 300MHz, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF terminated into 50I, LO
driven by 50I source, IF
transformed to 50I using
external components shown
IF Output Return Loss RL
RF-to-IF Isolation fRF = 3100MHz to 3900MHz, PLO = +3dBm 27 dB
LO Leakage at RF Port fLO = 2800MHz to 3600MHz, PLO = +3dBm -30 dBm
2LO Leakage at RF Port fLO = 2800MHz to 3600MHz, PLO = +3dBm -26.5 dBm
LO Leakage at IF Port fLO = 2800MHz to 3600MHz, PLO = +3dBm -27.5 dBm
in the Typical Application
IF
Circuit. See the Typical
Operating Characteristics
for performance vs. inductor
values.
5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz,
HIGH-SIDE LO INJECTION
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports
are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 3400MHz
to 4200MHz, fRF < fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF =
3500MHz, fLO = 3800MHz, fIF = 300MHz, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Small-Signal Conversion Gain G
Gain Variation vs. Frequency
Conversion Gain Temperature
Coefficient
Input 1dB Compression Point IP
Third-Order Input Intercept Point IIP3
IIP3 Variation with T
Single-Sideband Noise Figure NF
Noise Figure Temperature
Coefficient
2LO - 2RF Spur Rejection 2 x 2 f
3LO - 3RF Spur Rejection 3 x 3 f
C
DG
TC
TC
TC = +25NC
C
fRF = 3100MHz to 3900MHz, any 100MHz
band
C
fRF = 3100MHz to 3900MHz, any 200MHz
band
fRF = 3100MHz to 3900MHz,
CG
TC = -40NC to +85NC
(Note 10) 11.4 dBm
1dB
f
- f
RF1
TC = +25NC
fRF = 3100MHz to 3900MHz, f
P
RF1
No blockers present 9.8 dB
SSB
Single sideband, no blockers present,
NF
TC = -40NC to +85NC
SPUR
SPUR
= 1MHz, P
RF2
= P
= -5dBm/tone, TC = -40NC to +85NC
RF2
= fLO - 150MHz
= fLO - 100MHz
RF1
fIF = 450MHz,
L1 = L2 = 120nH
fIF = 350MHz,
L1 = L2 = 270nH
fIF = 300MHz,
L1 = L2 = 390nH
= P
= -5dBm/tone,
RF2
- f
RF1
PRF = -10dBm 70
PRF = -5dBm 65
PRF = -10dBm 89
PRF = -5dBm 79
= 1MHz,
RF2
17
17
17
8.4 dB
0.15
0.3
-0.01
24.8 dBm
Q0.2
0.018
dB
dB
dB/NC
dBm
dB/NC
dBc
dBc
MAX19998
_______________________________________________________________________________________ 5
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz,
HIGH-SIDE LO INJECTION (continued)
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports
are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 3400MHz
to 4200MHz, fRF < fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF =
3500MHz, fLO = 3800MHz, fIF = 300MHz, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF Input Return Loss RL
MAX19998
LO Input Return Loss RL
IF Output Impedance Z
IF Output Return Loss RL
RF-to-IF Isolation PLO = +3dBm 30 dB
LO Leakage at RF Port PLO = +3dBm -30.3 dBm
2LO Leakage at RF Port PLO = +3dBm -19 dBm
LO Leakage at IF Port PLO = +3dBm -23 dBm
LO on and IF terminated into a matched
RF
impedance
RF and IF terminated into a matched
LO
impedance
Nominal differential impedance at the IC’s IF
IF
outputs
RF terminated into
50I, LO driven by 50I
source, IF transformed
to 50I using external
components shown in
IF
the Typical Application
Circuit. See the Typical
Operating Characteristics
for performance vs.
inductor values.
fIF = 450MHz,
L1 = L2 = 120nH
fIF = 350MHz,
L1 = L2 = 270nH
fIF = 300MHz,
L1 = L2 = 390nH
24 dB
18 dB
200
20
20
20
I
dB
5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 2300MHz to 2900MHz,
HIGH-SIDE LO INJECTION
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports
are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 2300MHz to 2900MHz, fIF = 300MHz, fLO = 2600MHz
to 3200MHz, fRF < fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF =
2600MHz, fLO = 2900MHz, fIF = 300MHz, unless otherwise noted.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Small-Signal Conversion Gain G
Gain Variation vs. Frequency
Conversion Gain Temperature
Coefficient
Input 1dB Compression Point IP
Third-Order Input Intercept Point IIP3
6 ______________________________________________________________________________________
DG
TC
TC = +25NC
C
fRF = 2300MHz to 2900MHz, any 100MHz
band
C
fRF = 2300MHz to 2900MHz, any 200MHz
band
fRF = 2300MHz to 2900MHz,
CG
TC = -40NC to +85NC
(Note 10) 11.4 dBm
1dB
f
- f
RF1
TC = +25NC
= 1MHz, P
RF2
RF1
= P
RF2
= -5dBm/tone,
8.4 dB
0.15
dB
0.3
-0.01
25.0 dBm
dB/NC
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 2300MHz to 2900MHz,
HIGH-SIDE LO INJECTION (continued)
(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports
are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 2300MHz to 2900MHz, fIF = 300MHz, fLO = 2600MHz
to 3200MHz, fRF < fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF =
2600MHz, fLO = 2900MHz, fIF = 300MHz, unless otherwise noted. (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IIP3 Variation with T
Single-Sideband Noise Figure NF
Noise Figure Temperature
Coefficient
2LO - 2RF Spur Rejection 2 x 2 f
3LO - 3RF Spur Rejection 3 x 3 f
RF Input Return Loss RL
LO Input Return Loss RL
IF Output Impedance Z
IF Output Return Loss RL
C
SSB
TC
NF
RF
LO
IF
IF
fRF = 2300MHz to 2900MHz, f
P
= P
RF1
No blockers present 10.0 dB
Single sideband, no blockers present,
TC = -40NC to +85NC
SPUR
SPUR
LO on and IF terminated into a matched
impedance
RF and IF terminated into a matched
impedance
Nominal differential impedance at the IC’s IF
outputs
RF terminated into 50I,
LO driven by 50I source,
IF transformed to 50I
using external components shown in the Typical
Application Circuit. See
the Typical Operating
Characteristics for performance vs. inductor values.
= -5dBm/tone, TC = -40NC to +85NC
RF2
= fLO - 50MHz
= fLO - 100MHz
PRF = -10dBm 77
PRF = -5dBm 72
PRF = -10dBm 86
PRF = -5dBm 76
- f
RF1
fIF = 450MHz,
L1 = L2 = 120nH
fIF = 350MHz,
L1 = L2 = 270nH
fIF = 300MHz,
L1 = L2 = 390nH
= 1MHz,
RF2
Q0.2
0.018
30 dB
18 dB
200
25
25
25
dBm
dB/NC
dBc
dBc
I
dB
MAX19998
RF-to-IF Isolation PLO = +3dBm 45 dB
LO Leakage at RF Port PLO = +3dBm -28.8 dBm
2LO Leakage at RF Port PLO = +3dBm -42.3 dBm
LO Leakage at IF Port PLO = +3dBm -26.3 dBm
Note 5: Not production tested.
Note 6: Operation outside this range is possible, but with degraded performance of some parameters. See the Typical
Operating Characteristics.
Note 7: All limits reflect losses of external components, including a 0.8dB loss at fIF = 300MHz due to the 4:1 impedance trans-
former. Output measurements were taken at IF outputs of the Typical Application Circuit.
Note 8: Guaranteed by design and characterization.
Note 9: 100% production tested for functional performance.
Note 10: Maximum reliable continuous input power applied to the RF port of this device is +12dBm from a 50I source.
Note 11: Measured with external LO source noise filtered so that 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.
_______________________________________________________________________________________ 7
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
Typical Operating Characteristics
(Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 3100MHz to 3900MHz, LO is low-side injected
for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.)
CONVERSION GAIN vs. RF FREQUENCY
11
10
TC = -40°C
MAX19998
9
8
CONVERSION GAIN (dB)
7
6
3000 4000
RF FREQUENCY (MHz)
INPUT IP3 vs. RF FREQUENCY
26
25
INPUT IP3 (dBm)
24
TC = +85°C
TC = -40°C
TC = +25°C
TC = +85°C
3800360034003200
PRF = -5dBm/TONE
TC = +25°C
11
MAX19998 toc01
10
9
8
CONVERSION GAIN (dB)
7
6
26
MAX19998 toc04
25
INPUT IP3 (dBm)
24
CONVERSION GAIN vs. RF FREQUENCY
PLO = -3dBm, 0dBm, +3dBm
3000 4000
RF FREQUENCY (MHz)
3800360034003200
INPUT IP3 vs. RF FREQUENCY
PRF = -5dBm/TONE
PLO = -3dBm, 0dBm, +3dBm
11
MAX19998 toc02
10
CONVERSION GAIN (dB)
26
MAX19998 toc05
25
INPUT IP3 (dBm)
24
CONVERSION GAIN vs. RF FREQUENCY
9
8
7
6
3000 4000
VCC = 4.75V, 5.0V, 5.25V
3800360034003200
RF FREQUENCY (MHz)
INPUT IP3 vs. RF FREQUENCY
PRF = -5dBm/TONE
VCC = 5.25V
VCC = 5.0V
VCC = 4.75V
MAX19998 toc03
MAX19998 toc06
23
3000 4000
RF FREQUENCY (MHz)
2RF - 2LO RESPONSE
vs. RF FREQUENCY
90
80
70
2RF - 2LO RESPONSE (dBc)
60
50
3000 4000
TC = +85°C
RF FREQUENCY (MHz)
PRF = -5dBm
TC = -40°C
3800360034003200
TC = +25°C
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23
3000 4000
90
MAX19998 toc07
80
70
2RF - 2LO RESPONSE (dBc)
60
50
3000 4000
RF FREQUENCY (MHz)
2RF - 2LO RESPONSE
vs. RF FREQUENCY
PLO = +3dBm
PLO = 0dBm
PLO = -3dBm
RF FREQUENCY (MHz)
3800360034003200
PRF = -5dBm
3800360034003200
23
3000 4000
90
MAX19998 toc08
80
70
2RF - 2LO RESPONSE (dBc)
60
50
3000 4000
RF FREQUENCY (MHz)
2RF - 2LO RESPONSE
vs. RF FREQUENCY
VCC = 4.75V, 5.0V, 5.25V
RF FREQUENCY (MHz)
8 ______________________________________________________________________________________
3800360034003200
PRF = -5dBm
MAX19998 toc09
3800360034003200
SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
Typical Operating Characteristics (continued)
(Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 3100MHz to 3900MHz, LO is low-side injected
for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.)
MAX19998
3RF - 3LO RESPONSE
vs. RF FREQUENCY
85
75
TC = -40°C, +25°C, +85°C
65
3RF - 3LO RESPONSE (dBc)
55
3000 4000
RF FREQUENCY (MHz)
PRF = -5dBm
NOISE FIGURE vs. RF FREQUENCY
12
11
10
9
NOISE FIGURE (dB)
TC = +85°C
TC = +25°C
3RF - 3LO RESPONSE
vs. RF FREQUENCY
85
MAX19998 toc10
75
PLO = -3dBm, 0dBm, +3dBm
65
3RF - 3LO RESPONSE (dBc)
3800360034003200
55
3000 4000
RF FREQUENCY (MHz)
PRF = -5dBm
3800360034003200
85
MAX19998 toc11
75
65
3RF - 3LO RESPONSE (dBc)
55
3000 4000
NOISE FIGURE vs. RF FREQUENCY
MAX19998 toc13
NOISE FIGURE (dB)
12
11
10
9
PLO = -3dBm, 0dBm, +3dBm
MAX19998 toc14
NOISE FIGURE (dB)
12
11
10
9
3RF - 3LO RESPONSE
vs. RF FREQUENCY
PRF = -5dBm
MAX19998 toc12
VCC = 4.75V, 5.0V, 5.25V
3800360034003200
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
MAX19998 toc15
VCC = 4.75V, 5.0V, 5.25V
8
TC = -40°C
7
3000 4000
RF FREQUENCY (MHz)
INPUT P
13
12
(dBm)
1dB
11
INPUT P
10
9
3000 4000
vs. RF FREQUENCY
1dB
TC = +85°C
TC = -40°C
RF FREQUENCY (MHz)
TC = +25°C
_______________________________________________________________________________________ 9
8
3800360034003200
MAX19998 toc16
3800360034003200
7
3000 4000
RF FREQUENCY (MHz)
INPUT P
13
12
(dBm)
1dB
11
INPUT P
10
9
3000 4000
vs. RF FREQUENCY
1dB
PLO = -3dBm, 0dBm, +3dBm
RF FREQUENCY (MHz)
3800360034003200
MAX19998 toc17
3800360034003200
8
7
3000 4000
RF FREQUENCY (MHz)
INPUT P
13
VCC = 5.0V
9
3000 4000
(dBm)
1dB
INPUT P
12
11
10
vs. RF FREQUENCY
1dB
VCC = 5.25V
VCC = 4.75V
RF FREQUENCY (MHz)
3800360034003200
MAX19998 toc18
3800360034003200
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