THIS PAGE INTENTIONALLY LEFT BLANK
12 - 34
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
HMC628LP4 / 628LP4E
v07.0410
Functional Diagram
Electrical Speci cations, TA = +25° C, 50 Ohm System, Vdd= +5V
The HMC628LP4(E) is ideal for:
• Cellular/3G Infrastructure
• WiBro / WiMAX / 4G
• Microwave Radio & VSAT
• Test Equipment and Sensors
• IF & RF Applications
TTL/CMOS compatible serial, parallel or latched
parallel control interface
High Output IP3: +35 dBm (At all gain settings)
Wide Gain Control Range: 23 dB
Power-up State Selection
24 Lead 4x4 mm SMT Package: 16 mm2
Excellent State & Step Accuracy (±0.05 dB)
The HMC628LP4(E) is a digitally controlled variable
gain ampli er which operates from 50 to 800 MHz,
and can be programmed to provide anywhere from
8 dB attenuation, to 15 dB of gain, in 1.0 dB steps.
The HMC628LP4(E) delivers noise gure of 5 dB in its
maximum gain state, with output IP3 of up to +35 dBm
in any state. The dual mode control interface is CMOS/
TTL compatible, and accepts either a three wire serial
input or a 5 bit parallel word. The HMC628LP4(E) also
features a user selectable power up state and a serial
output port for cascading other Hittite serial controlled
components. The HMC628LP4(E) is housed in a
RoHS compliant 4x4 mm QFN leadless package, and
is available in three evaluation board con gurations,
depending on the application frequency.
Parameter 50 - 250 250 - 500 500 - 800 MHz
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units
Gain (Maximum Gain State) 13 15 12.8 14 10.5 13 dB
Gain Control Range 23 23 23 dB
Input Return Loss 12 10 10 dB
Output Return Loss 10 12.5 9 dB
Gain Accuracy: (Referenced to Maximum Gain State) ± (0.1 + 1% of Gain
Setting )Max
± (0.4 + 2% of Gain
Setting )Max
± (0.4 + 4% of Gain
Setting )Max dB
Output Power for 1dB Compression 19 19.5 16 18 14 18 dBm
Output Third Order Intercept Point 35 [1] 33 [2] 32 [3] dBm
Output Second Order Intercept Point 46 [1] 54 [2] 55 [3] dBm
Harmonics 2nd
3rd
46
69
55
75
62
83
dBc
dBc
Switching Characteristics tRISE, tFALL (10 / 90% RF) 11
18
ns
ns
tON, tOFF ( Latch Enable to 10 / 90% RF)
Noise Figure 5 6 6.5 dB
Supply Current (Idd) 6585 6585 6585mA
[1] Two-Tone Output Power @ 5 dBm [2] Two-Tone Output Power @ 2 dBm [3] Two-Tone Output Power @ 0 dBm
Typical Applications Features
General Description
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
12 - 35
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
50 to 250 MHz Tuning
Input Return Loss
(Only Major States are Shown)
Normalized Attenuation
(Only Major States are Shown)
Maximum Gain vs. Frequency
Output Return Loss
(Only Major States are Shown)
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
-25
-20
-15
-10
-5
0
5
10
15
20
25
0.05 0.1 0.15 0.2 0.25
+25 C
+85 C
-40 C
GAIN (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0.05 0.1 0.15 0.2 0.25
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.05 0.1 0.15 0.2 0.25
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.05 0.1 0.15 0.2 0.25
RETURN LOSS (dB)
FREQUENCY (GHz)
Output IP3 vs. Frequency
15
20
25
30
35
40
45
0.05 0.1 0.15 0.2 0.25
IP3 (dBm)
FREQUENCY (MHz)
Output IP2 vs. Frequency
30
35
40
45
50
55
60
0.05 0.1 0.15 0.2 0.25
IP3 (dBm)
FREQUENCY (MHz)
12 - 36
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Step Error vs. Frequency
(Only Major States are Shown)
Normal Relative Phase vs. Frequency
(Only Major States are Shown)
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0.05 0.1 0.15 0.2 0.25
STEP ERROR (dB)
FREQUENCY (GHz)
-30
-15
0
15
30
0.05 0.1 0.15 0.2 0.25
RELATIVE PHASE (deg)
FREQUENCY (GHz)
1 - 23 dB
Bit Error vs. Frequency
(Only Major States are Shown) Bit Error vs. Attenuation State
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 4 8 12 16 20 24
BIT ERROR (dB)
ATTENUATION STATE (dB)
(50, 100, 150, 200, 250) MHz
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0.05 0.1 0.15 0.2 0.25
BIT ERROR (dB)
FREQUENCY (GHz)
50 to 250 MHz Tuning
Noise Figure vs. Frequency
0
1
2
3
4
5
6
7
8
9
10
0.05 0.1 0.15 0.2 0.25
NOISE FIGURE (dB)
FREQUENCY (GHz)
Output IP3 vs. Attenuation @ 150 MHz
15
20
25
30
35
40
45
0 5 10 15 20 25
IP3 (dBm)
ATTENUATION (dB)
12 - 37
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
Input Return Loss
(Only Major States are Shown)
Normalized Attenuation
(Only Major States are Shown)
Maximum Gain vs. Frequency
Output Return Loss
(Only Major States are Shown)
250 to 500 MHz Tuning
-25
-20
-15
-10
-5
0
5
10
15
20
25
0.2 0.3 0.4 0.5 0.6
+25 C
+85 C
-40 C
GAIN (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0.2 0.3 0.4 0.5 0.6
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.2 0.3 0.4 0.5 0.6
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.2 0.3 0.4 0.5 0.6
RETURN LOSS (dB)
FREQUENCY (GHz)
Output IP3 vs. Frequency
15
20
25
30
35
40
45
0.25 0.3 0.35 0.4 0.45 0.5
IP3 (dBm)
FREQUENCY (MHz)
Output IP2 vs. Frequency
20
30
40
50
60
70
80
0.25 0.3 0.35 0.4 0.45 0.5
IP2 (dBm)
FREQUENCY (MHz)
12 - 38
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Step Error vs. Frequency
(Only Major States are Shown)
Normal Relative Phase vs. Frequency
(Only Major States are Shown)
Bit Error vs. Frequency
(Only Major States are Shown) Bit Error vs. Attenuation State
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
250 to 500 MHz Tuning
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0.2 0.3 0.4 0.5 0.6
BIT ERROR (dB)
FREQUENCY (GHz)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 4 8 12 16 20 24
BIT ERROR (dB)
ATTENUATION STATE (dB)
(250, 300, 350, 400, 450, 500) MHz
-40
-20
0
20
40
60
80
0.2 0.3 0.4 0.5 0.6
RELATIVE PHASE (deg)
FREQUENCY (GHz)
23 dB
16 dB
8 dB
1 - 4 dB
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0.2 0.3 0.4 0.5 0.6
STEP ERROR (dB)
FREQUENCY (GHz)
Noise Figure vs. Frequency
0
1
2
3
4
5
6
7
8
9
10
0.2 0.3 0.4 0.5 0.6
NOISE FIGURE (dB)
FREQUENCY (GHz)
Output IP3 vs. Attenuation @ 350 MHz
15
20
25
30
35
40
45
0 5 10 15 20 25
IP3 (dBm)
ATTENUATION (dB)
12 - 39
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Input Return Loss
(Only Major States are Shown)
Normalized Attenuation
(Only Major States are Shown)
Maximum Gain vs. Frequency
Output Return Loss
(Only Major States are Shown)
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
500 to 800 MHz Tuning
-25
-20
-15
-10
-5
0
5
10
15
20
25
0.4 0.5 0.6 0.7 0.8 0.9
+25 C
+85 C
-40 C
GAIN (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0.4 0.5 0.6 0.7 0.8 0.9
RELATIVE PHASE (deg)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.4 0.5 0.6 0.7 0.8 0.9
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.4 0.5 0.6 0.7 0.8 0.9
RETURN LOSS (dB)
FREQUENCY (GHz)
Output IP3 vs. Frequency
15
20
25
30
35
40
45
0.5 0.55 0.6 0.65 0.7 0.75 0.8
IP3 (dBm)
FREQUENCY (MHz)
Output IP2 vs. Frequency
20
30
40
50
60
70
80
0.5 0.55 0.6 0.65 0.7 0.75 0.8
IP2 (dBm)
FREQUENCY (MHz)
12 - 40
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Step Error vs. Frequency
(Only Major States are Shown)
Normal Relative Phase vs. Frequency
(Only Major States are Shown)
Bit Error vs. Frequency
(Only Major States are Shown) Bit Error vs. Attenuation State
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
500 to 800 MHz Tuning
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0.4 0.5 0.6 0.7 0.8 0.9
BIT ERROR (dB)
FREQUENCY (GHz)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 4 8 12 16 20 24
BIT ERROR (dB)
ATTENUATION STATE (dB)
800 MHz
700 MHz
-35
-30
-25
-20
-15
-10
-5
0
0.4 0.5 0.6 0.7 0.8 0.9
RELATIVE PHASE (deg)
FREQUENCY (GHz)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0.4 0.5 0.6 0.7 0.8 0.9
STEP ERROR (dB)
FREQUENCY (GHz)
16 dB
23 dB
Noise Figure vs. Frequency
0
1
2
3
4
5
6
7
8
9
10
0.4 0.5 0.6 0.7 0.8
NOISE FIGURE (dB)
FREQUENCY (GHz)
Output IP3 vs. Attenuation @ 650 MHz
15
20
25
30
35
40
45
0 5 10 15 20 25
IP3 (dBm)
ATTENUATION (dB)
12 - 41
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Serial Control Interface
Parallel Mode
(Direct Parallel Mode & Latched Parallel Mode)
The HMC628LP4(E) contains a 3-wire SPI compatible digital interface (DATA, CLK, LE). It is activated when P/S
is kept high. The 5-bit serial word must be loaded MSB rst. The positive-edge sensitive CLK and LE requires
clean transitions. Standard logic families work well. If mechanical switches were used, sufficient debouncing should
be provided. When LE is high, 5-bit data in the serial input register is transferred to the attenuator. When LE is high
CLK is masked to prevent data transition during output loading.
When P/S is low, 3-wire SPI interface inputs (DATA, CLK, LE) are disabled and serial input register is loaded
asynchronously with parallel digital inputs (B0-B4). When Le is high, 5-bit parallel data is transferred to the attenuator.
For all modes of operations, attenuation state will stay constant while LE is kept low.
Note: The parallel mode is enabled when P/S is set to low.
Direct Parallel Mode - The attenuation state is changed by the Control Voltage Inputs directly. The LE (Latch Enable)
must be at a logic high to control the attenuator in this manner.
Latched Parallel Mode - The attenuation state is selected using the Control Voltage Inputs and set while the LE is in
the Low state. The attenuator will not change state while LE is Low. Once all Control Voltage Inputs are at the desired
states the LE is pulsed. See timing diagram above for reference.
Timing Diagram (Latched Parallel Mode)
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
Parameter Typ.
Min. serial period, tSCK 100 ns
Control set-up time, tCS 20 ns
Control hold-time, tCH 20 ns
LE Set up-time, tLN 10 ns
Min. LE pulse width, tLEW 10 ns
Min LE pulse spacing, tLES 530 ns
Serial clock hold-time from LE, tCKN 10 ns
Hold Time, tPH 0 ns
Latch Enable Minimum Width, tLEN 10 ns
Setup Time, tPS 2 ns
12 - 42
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Absolute Maximum Ratings
RF Input Power 20 dBm
RF Output Power 22 dBm
Digital Inputs (B0-B4, Shift Clock,
Latch Enable & Data Input) -0.5V to Vdd +0.5V
Bias Voltage (Vdd) 5.6 V
Junction Temperature 125 °C
Continuous Pdiss (T = 85 °C)
(derate 13.5 mW/°C above 85 °C) [1] 0.54 W
Thermal Resistance
(Junction to ground paddle) 74.3 °C/ W
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Bias Voltage
Vdd (V) Idd (Typ.) (mA)
5V 65
PUP Truth Table
LE PUP1 PUP2 Gain Relative to
Maximum Gain
000Insertion Loss
010 -8
001 -16
011 -23
1 X X 0 to -23 dB
Note: Power-Up with LE= 1 provides direct parallel operation with
B4-B0.
Power-Up States
If LE is set to logic LOW at power-up, the logic state of
PUP1 and PUP2 determines the power-up state of the
part per PUP truth table. If the LE is set to logic HIGH
at power-up, the logic state of B4-B0 determines the
power-up state of the part per truth table. The DVGA
latches in the desired power-up state approximately
200 ms after power-up.
Power-On Sequence
The ideal power-up sequence is: GND, Vdd, digital
inputs, RF inputs. The relative order of the digital
inputs are not important as long as they are powered
after Vdd / GND
ATTENUATION
(dB) B4[1] B3[1] B2 B1 B0
0 00000
1 00001
2 00010
3 00011
4 00100
5 00101
6 00110
7 00111
8 01000
9 01001
10 01010
11 01011
12 01100
13 01101
14 01110
15 01111
16 1X000
17 1X001
18 1X010
19 1X011
20 1X100
21 1X101
22 1X110
23 1X111
[1] Enabling B4 disables B3, the minimum attenuation is 16 dB
Truth Table
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
Control Voltage Table
State Vdd = +3V Vdd = +5V
Low 0 to 0.5V @ <1 μA 0 to 0.8V @ <1 μA
High 2 to 3V @ <1 μA 2 to 5V @ <1 μA
12 - 43
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Outline Drawing
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS]
3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE
SOLDERED TO PCB RF GROUND.
7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED
LAND PATTERN.
Part Number Package Body Material Lead Finish MSL Rating Package Marking [3]
HMC628LP4 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] H628
XXXX
HMC628LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] H628
XXXX
[1] Max peak re ow temperature of 235 °C
[2] Max peak re ow temperature of 260 °C
[3] 4-Digit lot number XXXX
Package Information
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
12 - 44
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Pin Number Function Description Interface Schematic
1RFIN
This pin is DC coupled and matched to 50 Ohms.
A blocking capacitor is needed.
2GND These pins and package bottom must
be connected to RF/DC ground.
3 - 7 B4, B3,
B2, B1, B0
See Truth Table, Control Voltage Table
and Timing Diagram.
8LE
9DATA
10 CLK
12 PUP2
13 PUP1
14 P/S
15 SERIAL OUT Serial input data delayed by 5 clock cycles.
16 IBIAS Bias current to ampli er. External inductor is needed.
17 ISET External bias resistor to adjust the current of the ampli er.
18 Vdd Supply Voltage.
19 FB Feedback capacitance for the ampli er.
Pin Descriptions
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
12 - 45
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
Pin Number Function Description Interface Schematic
11, 20 RFOUT,
AMP IN Ampli er input. External blocking capacitor required.
21 ATT OUT Attenuator output.
22 - 24 FC1, FC2, FC3 External capacitors to ground are required. Place these
capacitors close to the package.
12 - 46
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
Application Circuit
Tuned Frequency 50 - 250 MHz 250 - 500 MHz 500 - 800 MHz
Evaluation Board P/N 118415 120101 120102
C6 1 nF 33 pF 33 pF
L3 0 Ohms 15 nH 12 nH
C14 N/A 4.7 pF 1.5 pF
Components For Selected Frequencies
12 - 47
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
VARIABLE GAIN AMPLIFIERS - DIGITAL - SMT
12
Evaluation PCB
The circuit board used in the application should
use RF circuit design techniques. Signal lines should
have 50 Ohm impedance while the package ground
leads and exposed paddle should be connected
directly to the ground plane similar to that shown. A
sufficient number of via holes should be used to con-
nect the top and bottom ground planes. The evalua-
tion circuit board shown is available from Hittite upon
request.
List of Materials for Evaluation PCB See Table[1]
Item Description
J1, J2 PCB Mount SMA Connector
J3 18 Pin DC Connector
J6, J7 DC Pin
C1, C3 100 pF Capacitor, 0402 Pkg.
C2 4.7 μF Capacitor, 0805 Pkg.
C4 0.1 μF Capacitor, 0402 Pkg.
C6, C14 0402 Pkg.[1]
C5 - C7, C9 - C12 1000 pF Capacitor, 0402 Pkg.
C8 10 kpF Capacitor, 0805 Pkg.
R1 - R12 100 kOhm Resistor, 0402 Pkg.
R15 - R19 39 kOhm Resistor, 0402 Pkg.
R23 1.4 kOhm Resistor, 0603 Pkg.
L1, L2 270 nH Inductor, 0603 Pkg.
L3 0402 Pkg.[1]
HMC628LP4 / 628LP4E
v07.0410
BiCMOS MMIC 5-Bit DIGITAL
VARIABLE GAIN AMPLIFIER, 50 - 800 MHz
Item Description
SW1, SW2 SPDT 4 Position Dip Switch
U1 HMC628LP4(E) Variable Gain Ampli er
PCB [2] 118413 Evaluation PCB
[1] When requesting an evaluation board, please reference the
appropriate PCB number listed in the table “Components for
Selected Frequencies.”
[2] Circuit Board Material: Arlon 25FR / FR4
