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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
ATTENUATORS - DIGITAL - SMT
8
8 - 1
HMC759LP3E
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
v00.0909
Functional Diagram
Electrical Specications
TA = +25 °C, 50Ω System, with Vdd1 = Vdd2 = +5V & Vctl = 0/+5V
The HMC759LP3E is a 7-bit BiCMOS Digital
Attenuator in a low cost leadless SMT package. This
versatile digital attenuator incorporates off-chip AC
ground capacitors for near DC operation, making it
suitable for a wide variety of RF and IF applications.
The control interface is CMOS/TTL compatible and
accepts a three wire serial input. The HMC759LP3E
features user selectable power up states and a serial
output port for cascading other Hittite serial controlled
components. The HMC759LP3E is housed in a
RoHS compliant 3x3 mm QFN leadless package, and
occupies only 9 mm2.
Parameter Frequency (MHz) Min. Typ. Max. Units
Insertion Loss 10 - 300 3.3 4.5 dB
Attenuation Range 10 - 300 31.75 dB
Return Loss (RF1, RF2, All Atten. States) 10 - 300 10 dB
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States 10 - 300 ± (0.05 + 1.5% of Atten. Settling) Max. dB
Input Power for 1 dB Compression 10 - 50
50 - 300
20
21
dBm
dBm
Input Third Order Intercept Point
(Two-Tone Input Power = 0 dBm Each Tone)
10 - 50
50 - 300
39
>40
dBm
dBm
Bias Current (Idd1 + Idd2) 10 - 300 300 650 1000 µA
Switching Time (50% LE to 90% RF) 10 - 300 15 ns
Typical Applications Features
General Description
The HMC759LP3E is ideal for:
• Cellular/3G Infrastructure
• WiBro / WiMAX / 4G
• Microwave Radio & VSAT
• Test Equipment and Sensors
• IF & RF Applications
0.25 dB LSB Steps to 31.75 dB
Power-Up State Selection
High Input IP3: +40 dBm
TTL/CMOS Compatible, Serial Control
Excellent State & Step Accuracy ±0.25 dB
Single +5V Supply
16 Lead 3x3mm SMT Package: 9mm2
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
ATTENUATORS - DIGITAL - SMT
8
8 - 2
Output Return Loss [1]
(Only Major States are Shown)
Input Return Loss [1]
(Only Major States are Shown)
Normalized Attenuation [1]
(Only Major States are Shown)
Insertion Loss vs. Temperature [1]
[1] Data taken with broadband DC blocking on RF input and output ports.
[2] C1, C2 = 10nF
Bit Error vs. Frequency [2]
(Only Major States are Shown)
Bit Error vs. Attenuation State [2]
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
-5
-4
-3
-2
-1
0
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
+25C
+85C
-40C
FREQUENCY (GHz)
INSERTION LOSS (dB)
-35
-30
-25
-20
-15
-10
-5
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
RETURN LOSS (dB)
31.75 dB
16 dB
8 dB
4 dB
-0.5
-0.25
0
0.25
0.5
0 4 8 12 16 20 24 28 32
ATTENUATION STATE (dB)
BIT ERROR (dB)
10 MHz
200 MHz
300 MHz
-35
-30
-25
-20
-15
-10
-5
0
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
NORMALIZED ATTENUATION (dB)
31.75 dB
16 dB
8 dB
4 dB
-20
-15
-10
-5
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
RETURN LOSS (dB)
31.75 dB
0 dB
-0.5
-0.25
0
0.25
0.5
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
BIT ERROR (dB)
31.75 dB
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
ATTENUATORS - DIGITAL - SMT
8
8 - 3
Worst Case Step Error
Between Successive Attenuation States [1]
IP3 vs. Attenuation States [1]
(Only Major States are Shown)
Input P1dB vs. Attenuation States [1][2]
(Only Major States are Shown)
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
Serial Control Interface
The HMC759LP3E contains a 3-wire
SPI compatible digital interface
(SERIN, CLK, LE). The 7-bit serial
word must be loaded MSB rst.
The positive-edge sensitive CLK
and LE requires clean transitions.
If mechanical switches are used,
sufficient debouncing should be
provided. When LE is high, 7-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.
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
STEP ERROR (dB)
31.75 dB
25
30
35
40
45
50
55
60
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
IP3 (dBm)
31.75 dB
16 dB
8 dB
0 dB
16
18
20
22
24
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
FREQUENCY (GHz)
P1dB (dBm)
4 dB8 dB
16 dB
[1] C1, C2 = 10nF
[2] Part does not enter 1 dB compression at 31.75 dB max attenuation up to 25 dBm input power.
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
ATTENUATORS - DIGITAL - SMT
8
8 - 4
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
Bias Voltage
Vdd (V) Idd (Typ.) (µA)
4.5 580
5.0 650
5.5 710
PUP Truth Table
Truth Table
Power-Up States
LE PUP1 PUP2 Relative Attenuation
0 0 0 -31.75
0 1 0 -24
0 0 1 -16
0 1 1 Insertion Loss
1 X X Indeterminate
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 kept high
at power up, power up state will be indeterminate
therefore is not recommended.
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
Parameter Typ.
Min. serial period, tSCK 100 ns
Control set-up time, tCS 20 ns
Control hold-time, tCH 20 ns
LE setup-time, tLN 10 ns
Min. LE pulse width, tLEW 10 ns
Min LE pulse spacing, tLES 630 ns
Serial clock hold-time from LE, tCKN 10 ns
Control Voltage Table
State Vdd = +5V
Low 0 to 0.8V @ <1 µA
High 2 to 5V @ <1 µA
Control Voltage Input Reference
Insertion Loss
(dB)
D6 D5 D4 D3 D2 D1 D0
High High High High High High High 0
High High High High High High Low 0.25
High High High High High Low High 0.5
High High High High Low High High 1
High High High Low High High High 2
High High Low High High High High 4
High Low High High High High High 8
Low High High High High High High 16
Low Low Low Low Low Low Low 31.75
Any combination of the above states will provide an attenuation equal to the sum of the bits selected.
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
ATTENUATORS - DIGITAL - SMT
8
8 - 5
Absolute Maximum Ratings
RF Input Power (RF1, RF2) 20 dBm (T = +85 °C)
Digital Inputs
(SERIN LE, CLK, PUP1, PUP2) -0.5 to Vdd +0.5V
Bias Voltage (Vdd) 5.6V
Channel Temperature 125 °C
Continuous Pdiss (T = 85 °C)
(derate 9.8 mW/°C above 85 °C) 0.29 W
Thermal Resistance
(channel to ground paddle) 138 °C/W
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
ESD Sensitivity (HBM) Class 1A
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
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 [1]
HMC759LP3E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 759
XXXX
[1] 4-Digit lot number XXXX
[2] Max peak reow temperature of 260 °C
Package Information
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
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
ATTENUATORS - DIGITAL - SMT
8
8 - 6
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
Pin Number Function Description Interface Schematic
1 Vdd1 This pin should be pulled high to
Vdd through a 39 k resistor.
2 SERIN
See Truth Table, Control Voltage Table
and Timing Diagram.
3 LE
4 CLK
5 PUP1
6 PUP2
7 SEROUT Serial input data delayed by 7 clock cycles.
8, 13 RF1,
RF2
This pin is DC coupled and matched to
50 Ohms. Blocking capacitors are required.
9 - 12 ACG0 - 3 External capacitors to ground are required. Place
these capacitors close to the package.
14 GND This pin and package bottom must
be connected to RF/DC ground.
15 Vdd2 Supply voltage.
16 N/C
This pin is not connected internally; however, all data
shown herein was measured with this pin connected
to RF/DC ground externally.
Pin Descriptions
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
ATTENUATORS - DIGITAL - SMT
8
8 - 7
Application Circuit
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
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
ATTENUATORS - DIGITAL - SMT
8
8 - 8
HMC759LP3E
v00.0909
0.25 dB LSB BiCMOS MMIC 7-BIT
DIGITAL ATTENUATOR, 10 - 300 MHz
Evaluation PCB
The circuit board used in the nal 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 connect the top and bottom
ground planes. The evaluation circuit board shown
is available from Hittite upon request.
List of Materials for Evaluation PCB 125228 [1]
Item Description
J1, J2 PCB Mount SMA Connector
J3 18 Pin DC Connector
J4, J5 DC Pin
C1 - C6 10 nF Capacitor, 0402 Pkg.
C7, C8 100 pF Capacitor, 0402 Pkg.
C9 1 nF Capacitor, 0402 Pkg.
C10 4.7 µF Capacitor, 0805 Pkg.
R1 - R4 39K Ohm Resistor, 0402 Pkg.
U1 HMC759LP3E Digital Attenuator
PCB [2] 125226 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Arlon 25FR or Rogers 4350
