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HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
5
ATTENUATORS - DIGITAL - SMT
Typical Applications
The HMC792LP4E is ideal for: * Cellular/3G Infrastructure * WiBro / WiMAX / 4G * Microwave Radio & VSAT * Test Equipment and Sensors * IF & RF Applications
Features
0.25 dB LSB Steps to 15.75 dB Power-Up State Selection High Input IP3: +55 dBm Low Insertion Loss: 1.8 dB @ 2.0 GHz TTL/CMOS Compatible, Serial, Parallel or Latched Parallel Control 0.2 dB Typical Step Error Single +3V or +5V Supply 24 Lead 4x4mm SMT Package: 16mm2
Functional Diagram
General Description
The HMC792LP4E is a broadband 6-bit GaAs IC 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 dual mode control interface is CMOS/TTL compatible, and accepts either a three wire serial input or a 6 bit parallel word. The HMC792LP4E also features a user selectable power up state and a serial output port for cascading other Hittite serial controlled components. The HMC792LP4E is housed in a RoHS compliant 4x4 mm QFN leadless package, and requires no external matching components.
Electrical Specifi cations, TA = +25 C, Vctl = 0/+Vdd
Min. Parameter Frequency (GHz) Vdd = +3V Insertion Loss Attenuation Range Return Loss (RF1, RF2, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States DC - 3.0 GHz 3.0 - 6.0 GHz DC - 6.0 GHz DC - 6.0 GHz DC - 0.8 GHz 0.8 - 3.0 GHz 3.0 - 4.0 GHz 4.0 - 6.0 GHz 0.05 - 0.15 GHz 0.15 - 6.0 GHz DC - 6.0 GHz DC - 6.0 GHz 110 150 DC - 6.0 GHz 1.4 110 150 1.6 ns ns mA 1.8 3.3 15.75 17 2.4 5.0 Vdd = +5V 1.8 3.3 15.75 17 2.4 5.0 dB dB dB dB dB dB dB dB dBm dBm dBm Typ. Max. Min. Typ. Max. Units
(0.2 + 4% of Atten. Setting) Max. (0.2 + 3% of Atten. Setting) Max. (0.2 + 5% of Atten. Setting) Max. (0.2 + 6% of Atten. Setting) Max. 22 27 55 22 30 55
Input Power for 0.1 dB Compression Input Third Order Intercept Point (Two-Tone Input Power= 10 dBm Each Tone) Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) Supply Current
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
Normalized Attenuation [1] Insertion Loss vs. Temperature
0
NORMALIZED ATTENUATION (dB)
[1]
(Only Major States are Shown)
0
5
ATTENUATORS - DIGITAL - SMT
5 - 227
INSERTION LOSS (dB)
-1
-5
-2
-10
-3
+25 C +85 C -40 C
-4
-15
-5 0 1 2 3 4 5 6 FREQUENCY (GHz)
-20 0 1 2 3 4 5 6 FREQUENCY (GHz)
Input Return Loss [1]
(Only Major States are Shown)
0 -5 RETURN LOSS (dB)
Output Return Loss [1]
(Only Major States are Shown)
0 -5 RETURN LOSS (dB) -10 -15 -20 -25 -30 -35 -40
-10 -15 -20 -25 -30 -35 -40 0 1 2 3 4 5 6 FREQUENCY (GHz)
0
1
2
3
4
5
6
FREQUENCY (GHz)
Bit Error vs. Attenuation State
1 0.8 0.6 BIT ERROR (dB)
6 GHz
Bit Error vs. Attenuation State [2]
1 0.8 0.6 BIT ERROR (dB) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1
2GHz 900MHz 4GHz 6GHz
0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 4 8 12 16 ATTENUATION STATE (dB)
1GHz, 2GHz 100MHz, 4GHz
0
4
8
12
16
ATTENUATION STATE (dB)
[1] Data taken with broadband DC blocks on RF ports, Vdd = 5V [2] Data taken with ACG capacitors, C4, C5 & C6 removed. See application circuit and note.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
5
ATTENUATORS - DIGITAL - SMT
Bit Error vs. Frequency
(Only Major States are Shown)
2 1.5
15.75 dB
Bit Error vs. Frequency [2]
(Only Major States are Shown)
2 1.5 1 BIT ERROR (dB) 0.5 0 -0.5 -1 -1.5
15.75 dB
1 BIT ERROR (dB) 0.5 0 -0.5 -1 -1.5 -2 0 1 2 3 4 5 6 FREQUENCY (GHz)
-2 0 1 2 3 4 5 6 FREQUENCY (GHz)
Worst Case Step Error Between Successive Attenuation States (Only Major States are Shown)
1 0.8 0.6 STEP ERROR (dB) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 1 2 3 4 5 6 FREQUENCY (GHz)
Input IP3 vs. Temperature (Worst Case Major
Bit State at Each Frequency is Shown)
70 65 60 IP3 (dBm) 55 50 45 40 35 30 0 1 2 3 4 5 6 FREQUENCY (GHz)
+25 C +85 C -40 C
Input Power for 0.1dB Compression @ Vdd = 3V (Detail of Low Frequency Roll-Off)
32 30 P0.1dB (dBm)
Input Power for 0.1dB Compression @ Vdd = 5V (Detail of Low Frequency Roll-Off)
32 30 P0.1dB (dBm) 28 26 24 22 20
28 26 24 22 20 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 FREQUENCY (GHz)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
FREQUENCY (GHz)
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
Serial Control Interface
The HMC792LP4E contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). The serial control interface is activated when P/S is kept high. The 6-bit serial word must be loaded MSB first. The positive-edge sensitive CLK and LE requires clean transitions. If mechanical switches are used, sufficient debouncing should be provided. When LE is high, 6-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 (SERIN, CLK, LE) are disabled and the input register is loaded with parallel digital inputs (D0-D5). When LE is high, 6-bit parallel data changes the state of the part per truth table. For all modes of operations, the attenuation state will stay constant while LE is kept low.
5
ATTENUATORS - DIGITAL - SMT
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
5
ATTENUATORS - DIGITAL - SMT
Timing Diagram (Latched Parallel Mode)
Parameter Min. serial period, tSCK Control set-up time, tCS Control hold-time, tCH LE setup-time, tLN Min. LE pulse width, tLEW Min LE pulse spacing, tLES Serial clock hold-time from LE, tCKN Hold Time, tPH. Typ. 100 ns 20 ns 20 ns 10 ns 10 ns 630 ns 10 ns 0 ns 10 ns 2 ns
Parallel Mode
(Direct Parallel Mode & Latched Parallel Mode)
Note: The parallel mode is enabled when P/S is set to low.
Latch Enable Minimum Width, tLEN Setup Time, tPS
Direct Parallel Mode - The attenuation state is changed by the control voltage inputs D0-D5 directly. The LE (Latch Enable) must be at a logic high at all times to control the attenuator in this manner. Latched Parallel Mode - The attenuation state is selected using the control voltage inputs D0-D5 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.
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 D0-D5 determines the power-up state of the part per truth table. The attenuator latches in the desired power-up state approximately 200 ms after power-up.
PUP Truth Table
LE 0 0 0 0 1 PUP1 0 1 0 1 X PUP2 0 0 1 1 X Relative Attenuation -15.75 -12 -8 Insertion Loss 0 to -15.75 dB
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
Note: The logic state of D0 - D5 determines the power-up state per truth table shown below when LE is high at power-up.
Truth Table
Control Voltage Input D5 D4 High High High High High Low High Low D3 High High High High Low High High Low D2 High High High Low High High High Low D1 High High Low High High High High Low D0 High Low High High High High High Low Reference Insertion Loss 0 dB -0.25 dB -0.5 dB -1 dB -2 dB -4 dB -8 dB -15.75 dB
Control Voltage Table
State Low High Vdd = +3V 0 to 0.5V @ <1 A 2 to 3V @ <1 A Vdd = +5V 0 to 0.8V @ <1 A 2 to 5V @ <1 A
High High High High High High Low Low
Any combination of the above states will provide an attenuation equal to the sum of the bits selected.
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
Absolute Maximum Ratings
RF Input Power (DC - 6 GHz) Digital Inputs (D0 to D5, P/S, CLK, SERIN, LE, PUP1, PUP2) Bias Voltage (Vdd) Channel Temperature Continuous Pdiss (T = 85 C) (derate 11.5 mW/C above 85 C) [1] Thermal Resistance (Channel to package bottom) Storage Temperature Operating Temperature +30 dBm -0.5 to Vdd +0.5 5.6V 150 C 0.748 W 87 C/W -65 to +150 C -40 to +85 C
5
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.
Package Information
Part Number HMC792LP4E Package Body Material RoHS-compliant Low Stress Injection Molded Plastic Lead Finish 100% matte Sn MSL Rating MSL1
[2]
Package Marking [1] H792 XXXX
[1] 4-Digit lot number XXXX [2] Max peak reflow temperature of 260 C
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
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ATTENUATORS - DIGITAL - SMT
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
5
ATTENUATORS - DIGITAL - SMT
Pin Descriptions
Pin Number Function Description Interface Schematic
1
P/S
2
CLK See truth table, control voltage table and timing diagram.
3
SERIN
4
LE
5, 14
GND
These pins and package bottom must be connected to RF/DC ground. These pins are DC coupled and matched to 50 Ohms. Blocking capacitors are required. Select value based on lowest frequency of operation. External capacitors to ground is required. Select value for lowest frequency of operation. Place capacitor as close to pins as possible.
6, 13
RF1, RF2
7 - 12
ACG1 - ACG6
15
SEROUT
Serial input data delayed by 6 clock cycles.
16, 17
PUP2, PUP1 See truth table, control voltage table and timing diagram.
19 - 24
D5, D4, D3, D2, D1, D0
18
Vdd
Supply voltage
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
Application Circuit
5
ATTENUATORS - DIGITAL - SMT
For frequencies less than 700 MHz, the use of ACG capacitors C4, C5 and C6 is recommended. For frequencies greater than 700 MHz, the HMC792LP4E has similar performance with and without the ACG capacitors.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
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HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
5
ATTENUATORS - DIGITAL - SMT
Evaluation PCB
List of Materials for Evaluation PCB 118853 [1]
Item J1, J2 J3 J4 C1, C2 C3 C4 - C6 U1 PCB [2] Description PCB Mount SMA Connector 18 Pin DC Connector DC Pin 100 pF Capacitor, 0402 Pkg. 1000 pF Capacitor, 0402 Pkg. 330 pF Capacitor, 0402 Pkg. HMC792LP4E Digital Attenuator 118852 Evaluation PCB
The circuit board used in the final 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.
[1] Reference this number when ordering complete evaluation PCB [2] Circuit Board Material: Arlon 25FR or Rogers 4350
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC792LP4E
v00.0609
0.25 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz
Notes:
5
ATTENUATORS - DIGITAL - SMT
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
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