RF frequency range of 1200 MHz to 2500 MHz
IF frequency range of 30 MHz to 450 MHz
Power conversion gain: 8.2 dB
SSB noise figure of 9.9 dB
SSB noise figure with 5 dBm blocker of 21 dB
Input IP3 of 31 dBm
Input P1dB of 11 dBm
Typical LO drive of 0 dBm
Single-ended, 50 Ω RF and LO input ports
High isolation SPDT LO input switch
Single-supply operation: 3.3 V to 5 V
Exposed paddle, 6 mm × 6 mm, 36-lead LFCSP
APPLICATIONS
Cellular base station receivers
Transmit observation receivers
Radio link downconverters
GENERAL DESCRIPTION
The ADL5356 uses a highly linear, doubly balanced, passive mixer
core along with integrated RF and local oscillator (LO) balancing
circuitry to allow single-ended operation. The ADL5356
incorporates the RF baluns, allowing for optimal performance over
a 1200 MHz to 2500 MHz RF input frequency range. Performance
is optimized for RF frequencies from 1700 MHz to 2500 MHz
using a low-side LO and RF frequencies from 1200 MHz to
1700 MHz using a high-side LO. The balanced passive mixer
arrangement provides good LO-to-RF leakage, typically better
than −35 dBm, and excellent intermodulation performance. The
balanced mixer core also provides extremely high input linearity,
allowing the device to be used in demanding cellular applications
where in-band blocking signals may otherwise result in the
degradation of dynamic performance. A high linearity IF buffer
amplifier follows the passive mixer core to yield a typical power
conversion gain of 8.2 dB and can be used with a wide range of
output impedances.
The ADL5356 provides two switched LO paths that can be used
in TDD applications where it is desirable to ping-pong between
two local oscillators. LO current can be externally set using a
resistor to minimize dc current commensurate with the desired
level of performance. For low voltage applications, the ADL5356 is
capable of operation at voltages down to 3.3 V with substantially
reduced current. Under low voltage operation, an additional logic
pin is provided to power down (<300 µA) the circuit when desired.
ADL5356
FUNCTIONAL BLOCK DIAGRAM
N
M
M
S
G
M
N
O
C
M
M
M
G
M
V
O
D
C
MNIN
MNCT
COMM
VPOS
COMM
VPOS
COMM
DVCT
DVIN
O
P
V
363534333231302928
1
2
3
4
5
6
7
8
9
101112131415161718
S
O
P
V
The ADL5356 is fabricated using a BiCMOS high performance
IC process. The device is available in a 6 mm × 6 mm, 36-lead
LFCSP and operates over a −40°C to +85°C temperature range.
An evaluation board is also available.
Table 1. Passive Mixers
RF Frequency
(MHz)
Single
Mixer
500 to 1700 ADL5367 ADL5357 ADL5358
1200 to 2500 ADL5365 ADL5355 ADL5356
P
O
O
N
N
M
M
P
N
O
O
V
V
D
D
Figure 1.
Single Mixer
and IF Amp
E
L
N
M
ADL5356
E
L
V
D
G
S
L
O
N
P
V
S
O
P
V
C
M
N
27
LOI2
26
VGS2
25
VGS1
24
VGS0
23
LOSW
22
PWDN
21
VPOS
20
COMM
19
LOI1
C
G
L
N
V
D
Dual Mixer
and IF Amp
07883-001
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
VS = 5 V, IS = 350 mA, TA = 25°C, fRF = 1900 MHz, fLO = 1697 MHz, LO power = 0 dBm, RF power = −10 dBm, R1 = R4 = 1.3 k, R2 =
R5 = 1 k, Z
Table 2.
Parameter Conditions Min Typ Max Unit
RF INPUT INTERFACE
Return Loss Tunable to >20 dB over a limited bandwidth 15 dB
Input Impedance 50 Ω
RF Frequency Range 1200 2500 MHz
OUTPUT INTERFACE
Output Impedance Differential impedance, f = 200 MHz 230||0.75 Ω||pF
IF Frequency Range 30 450 MHz
DC Bias Voltage1 Externally generated 3.3 5.0 5.5 V
LO INTERFACE
LO Power −6 0 +10 dBm
Return Loss 13 dB
Input Impedance 50 Ω
LO Frequency Range 1230 2470 MHz
POWER-DOWN (PWDN) INTERFACE2
PWDN Threshold 1.0 V
Logic 0 Level 0.4 V
Logic 1 Level 1.4 V
PWDN Response Time Device enabled, IF output to 90% of its final level 160 ns
Device disabled, supply current < 5 mA 230 ns
PWDN Input Bias Current Device enabled 0 μA
Device disabled 70 μA
1
Apply supply voltage from external circuit through choke inductors.
2
PWDN function is intended for use with VS ≤ 3.6 V only.
VS = 5 V, IS = 350 mA, TA = 25°C, fRF = 1900 MHz, fLO = 1697 MHz, LO power = 0 dBm, RF power = −10 dBm, R1 = R4 = 1.3 k, R2 = R5 = 1 k,
VGS0 = VGS1 = VGS2 = 0 V, and Z
Table 3.
Parameter Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
Power Conversion Gain Including 4:1 IF port transformer and PCB loss 7.5 8.2 8.5 dB
Voltage Conversion Gain Z
SSB Noise Figure 9.9 dB
SSB Noise Figure Under Blocking
Input Third-Order Intercept (IIP3)
Input Second-Order Intercept (IIP2)
Input 1 dB Compression Point (IP1dB) 11 dBm
LO-to-IF Leakage Unfiltered IF output −24 dBm
LO-to-RF Leakage −35 dBm
RF-to-IF Isolation −33 dBc
IF/2 Spurious −10 dBm input power −75 dBc
IF/3 Spurious −10 dBm input power −73 dBc
IF Channel-to-Channel Isolation 50 dB
POWER SUPPLY
Positive Supply Voltage 4.75 5 5.25 V
Quiescent Current LO supply 170 mA
IF supply 180 mA
Total Quiescent Current VS = 5 V 350 mA
= 50 Ω, unless otherwise noted.
O
= 50 Ω, differential Z
SOURCE
5 dBm blocker present ±10 MHz from wanted RF input,
LO source filtered
= 1899.5 MHz, f
f
RF1
RF2
each RF tone at −10 dBm
= 1900 MHz, f
f
RF1
= 1950 MHz, fLO = 1697 MHz,
RF2
each RF tone at −10 dBm
= 200 Ω differential 14.5 dB
LOAD
= 1900.5 MHz, fLO = 1697 MHz,
21 dB
25 31 dBm
50 dBm
3.3 V PERFORMANCE
VS = 3.3 V, IS = 200 mA, TA = 25°C, fRF = 1900 MHz, fLO = 1697 MHz, LO power = 0 dBm, RF power = −10 dBm, R1 = R4 = 1.2 k, R2 =
R5 = 400 , VGS0 = VGS1 = VGS2 = 0 V, and Z
Table 4.
Parameter Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
Power Conversion Gain Including 4:1 IF port transformer and PCB loss 8.3 dB
Voltage Conversion Gain Z
SSB Noise Figure 8.9 dB
Input Third-Order Intercept (IIP3)
Input Second-Order Intercept (IIP2)
Input 1 dB Compression Point (IP1dB) 7 dBm
POWER INTERFACE
Supply Voltage 3.0 3.3 3.6 V
Quiescent Current Resistor programmable 200 mA
Total Quiescent Current Device disabled 300 μA
= 50 , unless otherwise noted.
O
= 50 Ω, differential Z
SOURCE
= 1899.5 MHz, f
f
RF1
RF2
LOAD
= 1900.5 MHz, fLO = 1697 MHz,
each RF tone at −10 dBm
= 1950 MHz, f
f
RF1
= 1900 MHz, fLO = 1697 MHz,
RF2
each RF tone at −10 dBm
= 200 Ω differential 14.6 dB
21.2 dBm
48 dBm
Rev. 0 | Page 4 of 24
Page 5
ADL5356
ABSOLUTE MAXIMUM RATINGS
Table 5.
Parameter Rating
Supply Voltage, VS 5.5 V
RF Input Level 20 dBm
LO Input Level 13 dBm
MNOP, MNON, DVOP, DVON Bias 6.0 V
VGS2,VGS1,VGS0, LOSW, PWDN 5.5 V
Internal Power Dissipation 2.2 W
θJA 22°C/W
Maximum Junction Temperature 150°C
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 60 sec) 260°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. 0 | Page 5 of 24
Page 6
ADL5356
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
N
M
M
P
E
S
O
G
M
O
N
N
O
P
M
C
M
V
6
5
4
3
3
3
3
3
1
MNIN
2
MNCT
3
COMM
4
VPOS
5
COMM
6
VPOS
7
COMM
DVCT
8
9
DVIN
NOTES
12. NC = NO CONNECT .
. EXPOSED P AD M US T BE CONNECTED T O GROUND.
ADL5356
TOP VIEW
(Not to S cale)
0
1
2
1
1
1
S
M
M
O
G
M
P
V
O
V
D
C
3
1
P
O
V
D
Figure 2. Pin Configuration
G
S
O
L
L
O
N
N
N
C
P
M
M
V
M
2
3
4
1
N
O
V
D
N
1
0
9
8
3
3
2
2
27
LOI2
VGS2
26
VGS1
25
VGS0
24
LOSW
23
22
PWDN
21
VPOS
20
COMM
LOI1
19
5
6
7
8
1
1
1
1
S
E
C
G
L
L
N
O
V
V
P
D
V
D
7883-002
Table 6. Pin Function Descriptions
Pin No. Mnemonic Description
1 MNIN RF Input for Main Channel. Internally matched to 50 Ω. Must be ac-coupled.
2 MNCT Center Tap for Main Channel Input Balun. Bypass to ground using low inductance capacitor.
3, 5, 7, 12, 20, 34 COMM Device Common (DC Ground).
4, 6, 10, 16,
VPOS Positive Supply Voltage.
21, 30, 36
8 DVCT Center Tap for Diversity Channel Input Balun. Bypass to ground using low inductance capacitor.
9 DVIN RF Input for Diversity Channel. Internally matched to 50 Ω. Must be ac-coupled.
11 DVGM Diverstiy Amplifier Bias Setting. Connect 1.3 kΩ resistor to ground for typical operation.
13, 14 DVOP, DVON
Diversity Channel Differential Open-Collector Outputs. DVOP and DVON should be pulled-up to
VCC using external inductors.
15 DVLE Diversity Channel IF Return. This pin must be grounded.
17 DVLG Diverstiy Channel LO Buffer Bias Setting. Connect 1 kΩ resistor to ground for typical operation.
18, 28 NC No Connect.
19 LOI1 Local Oscillator Input 1. Internally matched to 50 Ω. Must be ac-coupled.
22 PWDN
Connect to Ground for Normal Operation. Connect pin to 3 V for disable mode when using
VPOS < 3.6 V. PWDN pin must be grounded when VPOS > 3.6 V.
23 LOSW Local Oscillator Input Selection Switch. Set LOSW high to select LOI1 or set LOSW low to select LOI2.
24, 25, 26 VGS0, VGS1, VGS2 Gate to Source Control Voltages. For typical operation, set VGS0, VGS1, and VGS2 to low logic level.
27 LOI2 Local Oscillator Input 2. Internally matched to 50 Ω. Must be ac-coupled.
29 MNLG Main Channel LO Buffer Bias Setting. Connect 1 kΩ resistor to ground for typical operation.
31 MNLE Main Channel IF Return. This pin must be grounded.
32, 33 MNOP, MNON
Main Channel Differential Open-Collector Outputs. MNOP and MNON should be pulled-up to
VCC using external inductors.
35 MNGM Main Amplifier Bias Setting. Connect 1.3 kΩ resistor to ground for typical operation.
Paddle EPAD Exposed pad must be connected to ground.
Rev. 0 | Page 6 of 24
Page 7
ADL5356
TYPICAL PERFORMANCE CHARACTERISTICS
5 V PERFORMANCE
VS = 5 V, IS = 350 mA, TA = 25°C, fRF = 1900 MHz, fLO = 1697 MHz, LO power = 0 dBm, RF power = −10 dBm, R1 = R4 = 1.3 kΩ, R2 = R5 = 1 kΩ,
Z
Figure 51. SSB Noise Figure vs. RF Frequency at 3.3 V
Rev. 0 | Page 15 of 24
Page 16
ADL5356
SPUR TABLES
All spur tables are (N × fRF) − (M × fLO) and were measured using the standard evaluation board. Mixer spurious products are measured
in dBc from the IF output power level. Data was measured only for frequencies less than 6 GHz. Typical noise floor of the measurement
system = −100 dBm.
5 V Performance
VS = 5 V, IS = 350 mA, TA = 25°C, fRF = 1900 MHz, fLO = 1697 MHz, LO power = 0 dBm, RF power = −10 dBm, VGS0 = VGS1 = VGS2 = 0 V,
and Z
The ADL5356 consists of two primary components: the radio
frequency (RF) subsystem and the local oscillator (LO) subsystem.
The combination of design, process, and packaging technology
allows the functions of these subsystems to be integrated into
a single die using mature packaging and interconnection
technologies to provide a high performance, low cost design
with excellent electrical, mechanical, and thermal properties.
In addition, the need for external components is minimized,
optimizing cost and size.
The RF subsystem consists of integrated, low loss RF baluns,
passive MOSFET mixers, sum termination networks, and IF
amplifiers. The LO subsystem consists of an SPDT-terminated FET
switch and two multistage limiting LO amplifiers. The purpose of
the LO subsystem is to provide a large, fixed amplitude, balanced
signal to drive the mixer independent of the level of the LO input.
A block diagram of the device is shown in Figure 52.
N
M
MNIN
MNCT
COMM
VPOS
COMM
VPOS
COMM
DVCT
DVIN
M
S
G
O
P
V
363534333231302928
1
2
3
4
5
6
7
8
9
101112131415161718
S
O
P
V
M
N
O
C
M
M
M
G
M
V
O
D
C
P
O
N
M
P
O
V
D
E
O
L
N
N
M
M
E
N
L
O
V
V
D
D
S
O
P
V
ADL5356
S
O
P
V
G
L
N
C
M
N
27
LOI2
26
VGS2
25
VGS1
24
VGS0
23
LOSW
22
PWDN
21
VPOS
20
COMM
19
LOI1
C
G
L
N
V
D
Figure 52. Simplified Schematic
RF SUBSYSTEM
The single-ended, 50 RF input is internally transformed to a
balanced signal using a low loss (<1 dB) unbalanced-to-balanced
(balun) transformer. This transformer is made possible by an
extremely low loss metal stack, which provides both excellent
balance and dc isolation for the RF port. Although the port can be
dc connected, it is recommended that a blocking capacitor be used
to avoid running excessive dc current through the part. The RF
balun can easily support an RF input frequency range of 1200 MHz
to 2500 MHz.
07883-001
The resulting balanced RF signal is applied to a passive mixer that
commutates the RF input with the output of the LO subsystem.
The passive mixer is essentially a balanced, low loss switch that
adds minimum noise to the frequency translation. The only
noise contribution from the mixer is due to the resistive loss of
the switches, which is in the order of a few ohms.
Because the mixer is inherently broadband and bidirectional, it
is necessary to properly terminate all the idler (M × N product)
frequencies generated by the mixing process. Terminating the
mixer avoids the generation of unwanted intermodulation
products and reduces the level of unwanted signals at the input
of the IF amplifier, where high peak signal levels can compromise
the compression and intermodulation performance of the system.
This termination is accomplished by the addition of a sum network
between the IF amplifier and the mixer and in the feedback
elements in the IF amplifier.
The IF amplifier is a balanced feedback design that simultaneously
provides the desired gain, noise figure, and input impedance that
is required to achieve the overall performance. The balanced opencollector output of the IF amplifier, with impedance modified
by the feedback within the amplifier, permits the output to be
connected directly to a high impedance filter, differential amplifier,
or an analog-to-digital input while providing optimum secondorder intermodulation suppression. The differential output
impedance of the IF amplifier is approximately 200 . If
operation in a 50 system is desired, the output can be
transformed to 50 by using a 4:1 transformer.
The intermodulation performance of the design is generally limited
by the IF amplifier. The IP3 performance can be optimized by
adjusting the IF current with an external resistor.
Figure 41,
Figure 43, and Figure 44 illustrate how various IF and LO bias
resistors affect the performance with a 5 V supply. Additionally,
dc current can be saved by increasing either or both resistors. It
is permissible to reduce the dc supply voltage to as low as 3.3 V,
further reducing the dissipated power of the part. (No performance
enhancement is obtained by reducing the value of these resistors,
and excessive dc power dissipation may result.)
Rev. 0 | Page 17 of 24
Page 18
ADL5356
LO SUBSYSTEM
The LO amplifier is designed to provide a large signal level to
the mixer to obtain optimum intermodulation performance.
The resulting amplifier provides extremely high performance
centered on an operating frequency of 1700 MHz. The best
operation is achieved with either low-side LO injection for RF
signals in the 1700 MHz to 2500 MHz range or high-side injection
for RF signals in the 1200 MHz to 1700 MHz range. Operation
outside these ranges is permissible, and conversion gain is
extremely wideband, easily spanning 1200 MHz to 2500 MHz,
but intermodulation is optimal over the aforementioned ranges.
The ADL5356 has two LO inputs permitting multiple synthesizers
to be rapidly switched with extremely short switching times
(<40 ns) for frequency agile applications. The two inputs are
applied to a high isolation SPDT switch that provides a constant
input impedance, regardless of whether the port is selected, to
avoid pulling the LO sources. This multiple section switch also
ensures high isolation to the off input, minimizing any leakage
from the unwanted LO input that may result in undesired IF
responses.
The single-ended LO input is converted to a fixed amplitude
differential signal using a multistage, limiting LO amplifier. This
results in consistent performance over a range of LO input power.
Optimum performance is achieved from −6 dBm to +10 dBm,
but the circuit continues to function at considerably lower levels
of LO input power.
The performance of this amplifier is critical in achieving a
high intercept passive mixer without degrading the noise floor
of the system. This is a critical requirement in an interferer rich
environment, such as cellular infrastructure, where blocking
interferers can limit mixer performance. The bandwidth of the
intermodulation performance is somewhat influenced by the
current in the LO amplifier chain. For dc current sensitive
applications, it is permissible to reduce the current in the LO
amplifier by raising the value of the external bias control resistor.
For dc current critical applications, the LO chain can operate
with a supply voltage as low as 3.3 V, resulting in substantial
dc power savings.
In addition, when operating with supply voltages below 3.6 V, the
ADL5356 has a power-down mode that permits the dc current
to drop to <300 µA.
The logic inputs are designed to work with any logic family that
provides a Logic 0 input level of less than 0.4 V and a Logic 1
input level that exceeds 1.4 V. All logic inputs are high impedance
up to Logic 1 levels of 3.3 V. At levels exceeding 3.3 V, protection
circuitry permits operation up to 5.5 V, although a small bias
current is drawn.
Rev. 0 | Page 18 of 24
Page 19
ADL5356
APPLICATIONS INFORMATION
BASIC CONNECTIONS
The ADL5356 mixer is designed to downconvert radio
frequencies (RF) primarily between 1200 MHz and 2500 MHz
to lower intermediate frequencies (IF) between 30 MHz and
450 MHz. Figure 53 depicts the basic connections of the mixer.
It is recommended to ac-couple the RF and LO input ports to
prevent non-zero dc voltages from damaging the RF balun or
LO input circuit. The RFIN matching network consists of a
series 1.8 pF capacitor and a shunt 15 nH inductor to provide
the optimized RF input return loss for the desired frequency band.
IF PORT
The mixer differential IF interface requires pull-up choke inductors
to bias the open-collector outputs and to set the output match.
The shunting impedance of the choke inductors used to couple
dc current into the IF amplifier should be selected to provide
the desired output return loss.
The real part of the output impedance is approximately 200 Ω,
as seen in Figure 30, which matches many commonly used SAW
filters without the need for a transformer. This results in a voltage
conversion gain that is approximately 6 dB higher than the power
conversion gain, as shown in Ta ble 3 . When a 50 Ω output
impedance is needed, use a 4:1 impedance transformer, as shown
in Figure 53.
BIAS RESISTOR SELECTION
The IF bias resistors (R1 and R4) and LO bias resistors (R2 and R5)
are used to adjust the bias current of the integrated amplifiers at the
IF and LO terminals. It is necessary to have a sufficient amount
of current to bias both the internal IF and LO amplifiers to optimize
dc current vs. optimum IIP3 performance. Figure 41, Figure 43,
and Figure 44 provide the reference for the bias resistor selection
when lower power consumption is considered at the expense of
conversion gain and IP3 performance.
MIXER VGS CONTROL DAC
The ADL5356 features three logic control pins, VGS0 (Pin 24),
VGS1 (Pin 25), and VGS2 (Pin26), that allow programmability for
internal gate-to-source voltages for optimizing mixer performance
over desired frequency bands. The evaluation board defaults
VGS0, VGS1, and VGS2 to ground. Power conversion gain, NF,
IIP3, and input P1dB can be optimized, as shown in Figure 39
and Figure 40.
Rev. 0 | Page 19 of 24
Page 20
ADL5356
MAIN_IN
C9
Z1Z2
C3
C2
MAIN_OUTN
C19C17
C22
VCC
363534333231302928
1
2
3
4
5
R1
C33
C8C21
L1
C27
R10
VCC
C32
T1
L2
R3
L6
MAIN_OUTP
C25C18
VCC
R2
R12
R7
R14
R11
C16
R16
C34
R17
LO2
VCC
27
26
R13
25
R8
24
R15
23
DIV_IN
VCC
C6C7
C11
Z3Z4
GND
VCC
+
C10
6
7
8
9
101112131415161718
VCC
C23
R4
C20
DIV_OUTPDIV_OUTN
C30C31
VCC
R6
L5
C1C12
C28
R9
L3
C24C13
L4
C29
T2
ADL5356
VCC
22
21
C26
20
19
C14
R5
C15
LO1
VCC
R19
07883-153
Figure 53. Typical Application Circuit
Rev. 0 | Page 20 of 24
Page 21
ADL5356
EVALUATION BOARD
An evaluation board is available for the family of double balanced
mixers. The standard evaluation board schematic is shown in
Figure 54. The evaluation board is fabricated using Rogers®
RO3003 material. Tab le 7 describes the various configuration
options of the evaluation board. Evaluation board layout is shown
in Figure 55 and Figure 56.
Power Supply Decoupling. Nominal supply decoupling consists of a
0.01 μF capacitor to ground in parallel with 10 pF capacitors to
ground positioned as close to the device as possible.
RF Main and Diversity Input Interface. Main and diversity
input channels are ac-coupled through C9 and C11. Z1 to
Z4 provide additional component placement for external
matching/filter networks. C2, C3, C6, and C7 provide bypassing
for the center taps of the main and diversity on-chip input baluns.
IF Main and Diversity Output Interface. The open collector IF
output interfaces are biased through pull-up choke inductors
L1, L2, L4, and L5, with R3 and R6 available for additional
supply bypassing. T1 and T2 are 4:1 impedance transformers
used to provide a single-ended IF output interface with C27
and C28 providing center-tap bypassing. C17, C19, C20, C29,
C30, C31, C32, and C33 ensure an ac-coupled output interface.
Remove R9 and R10 for balanced output operation.
LO Interface. C14 and C16 provide ac coupling for the LOI1 and LOI2
local oscillator inputs. LOSEL selects the appropriate LO input for
both mixer cores. R15 provides a pull-down to ensure LOI2 is enabled
when the LOSEL jumper is removed. Jumper can be removed to
allow LOSEL interface to be exercised using external logic generator.
PWDN Interface. When the PWDN 2-pin shunt is inserted, the
ADL5356 is powered down. When R19 is open, it pulls the PWDN
logic low and enables the device. Jumper can be removed to allow
PWDN interface to be excercised using an external logic generator.
Grounding the PWDN pin is allowed during nominal operation but
is not permitted when supply voltages exceed 3.3 V.
Bias Control. R16 and R17 form a voltage divider to provide a 3 V for
logic control, bypassed to ground through C34. R7, R8, R11, R12, R13,
and R14 provide resistor programmability of VGS0, VGS1, and VGS2.
Typically, these nodes can be hardwired for nominal operation.
Grounding these pins is allowed for nominal operation. R2 and R5 set
the bias point for the internal LO buffers. R1 and R4 set the bias point
for the internal IF amplifiers. L3 and L6 are external inductors used to
improve isolation and common-mode rejection.