1 db LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz

Transcription

1 HMC37QS16G 1 LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 1 V4.11 Features 1 LSB STEPS to 31 SINGLE CONTROL LINE PER BIT +/-.5 TYPICAL BIT ERROR MINIATURE QSOP-16 PACKAGE: 9.4 mm² General Description The HMC37QS16G is a broadband 5-bit GaAs IC digital attenuator in a 16 lead QSOP grounded base surface mount plastic package. Covering DC to 4 GHz, the insertion loss is less then typical. The attenuator bit values are 1 (LSB),, 4, 8, and 16 for a total attenuation of 31. Attenuation accuracy is excellent at ±.5 typical with an IIP3 of up to +44 m. Five bit control voltage inputs, toggled between and -5V, are used to select each attenuation state at less than 5 ua each. A single Vee bias of -5V allows operation down to DC, satisfying CATV, cable modem, and all IF applications. The HMC37QS16G is also ideal for cellular, PCS, ISM, MMDS, and WLL applications. This product is an excellent alternative to the HMC35QS16G. Guaranteed Performance, With Vee = -5V & Vctl = /Vee, -4 to +85 deg C Insertion Loss Attenuation Range Parameter Return Loss (RF1 & RF All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) 1 - States 1-31 States 1-15 States States Input Power for.1 Compression Input Third Order Intercept Point (Two-Tone Input Power = m each) F requency M in. T yp. Max. DC GHz GHz GHz.7-4. GHz Units DC - 4. GHz 31 DC GHz GHz GHz.7-4. GHz DC -.7 GHz DC -.7 GHz.7-4. GHz.7-4. GHz ±. + 3% of Atten. Setting Max ±.3 + 5% of Atten. Setting Max ±.3 + 5% of Atten. Setting Max ±.6 + 8% of Atten. Setting Max.5-4. GHz 4 m.5-4. GHz 44 m Switching Characteristics trise, tfall (1/9%RF) ton/toff (5% CTL to 1/9% RF) DC - 4. GHz ns ns 1 Elizabeth Drive, Chelmsford, MA 184 Phone: Fax: Web Site: - 8

2 HMC37QS16G 1 LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz V4.11 FEBRUARY 1 Insertion Loss INSERTION LOSS () NORMALIZED ATTENUATION () C -4 C Normalized Attenuation C Absolute Bit Error vs Frequency Return Loss RF1, RF RETURN LOSS () , Absolute Bit Error vs. Attenuation State BIT ERROR () GHz 3.5 GHz.9 GHz 8.1 GHz ATTENUATION STATE () Relative Phase vs Frequency.4 GHz BIT ERROR () ,& RELATIVE PHASE (deg.) , Elizabeth Drive, Chelmsford, MA 184 Phone: Fax: Web Site:

3 HMC37QS16G 1 LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 1 V4.11 Functional Diagram/ Application Circuit PIN NUMBER V5 V Truth Table V1 16 Control V 8 Voltage Input V3 4 V4 V5 1 Attenuation State RF1 -RF Reference I.L. 1 V3 V pf RF1 C1 1 pf RF R1 C 5 k W Max Atten. Any combination of above states will provide an attenuation approximately equal to the sum of the bits selected. V1 Vee Control Voltage State Bias Condition DC Blocking capacitors C1 & C are required on RF1 & RF. Choose C1 = C = 1 pf ~.1 µf to allow lowest customer specific frequency to pass with minimal loss. R1 = 5KΩ is required as a DC ground return on either PIN 11 or PIN 14. L ow to - 7 ua Typ. H igh Vee ua Typ. Note: Vee = -5 V ± 1% Bias Voltage & Current Vee (VDC) Vee Range= -5. Iee (Typ.) (ma) Vdc ±1% Iee (Max.) (ma) Elizabeth Drive, Chelmsford, MA 184 Phone: Fax: Web Site: - 8

4 HMC37QS16G 1 LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz V4.11 FEBRUARY 1 Suggested Driver Circuit (One Circuit Required Per Bit Control Input) TTL OR CMOS Vz = 5.1V lzt = 5uA COMPENSATED DEVICES CD k W Outline VCC GND 1 W * 74HCTO4 (TTL) OR 74HCO4 (CMOS) -5 Vdc Simple driver using inexpensive standard logic ICs provides fast switching using minimum DC current. * Recommended value to suppress unwanted RF signals at V1 - V5 control lines. To GaAs IC Attenuator Control Inputs V1- V5 Absolute Maximum Ratings Control Bias Storage Operating Voltage (V1 to V5) Voltage (Vee) Temperature RF Input Power Temperature (.5-4 GHz) Vee -.5 Vdc -7. Vdc -65 to +15 deg C -4 to +85 deg C +6 m 1. MATERIAL: A) PACKAGE BODY - LOW STRESS INJECTION-MOLDED PLASTIC. B) LEADFRAME AND SLUG MATERIAL: COPPER ALLOY. PLATING : LEAD - TIN SOLDER PLATE (LEAD AND SLUG) 3. DIMENSIONS ARE IN INCHES (MILLIMETERS). UNLESS OTHERWISE SPECIFIED ALL TOL. ARE ±.5(±.13). 4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF.15 MM PER SIDE 5. DIMENSION DOES NOT INCLUDE MOLDFLASH OF.5 MM PER SIDE 1 Elizabeth Drive, Chelmsford, MA 184 Phone: Fax: Web Site:

5 HMC37QS16G 1 LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 1 V4.11 Evaluation Circuit Board * R - R6 = 1 Ω. These resistors are optional and may be used to enhance decoupling of the RF path from the control inputs. The circuit board used in the final application should use RF circuit design techniques. Signal lines should have 5 ohm impedance while the package ground leads and exposed paddle should be connected directly to the ground plane similar to that shown above. A sufficient number of VIA holes should be used to connect the top and bottom ground planes. The evaluation circuit board as shown is available from Hittite upon request. Evaluation Circuit Board Layout Design Details Item J1 - J J3 - J9 R1 R - R6 Description PC Mount SMA Connector DC Pin 5k Ω Resistor, 4 Pkg. 1 Ω Resistor, 4 Pkg. C1, C 4 Chip Capacitor, Select Value for est Frequency of Operation U1 HMC37QS16G Digital Attenuator PCB* Evaluation PCB 1.5" x 1.5" *Circuit Board Material: Rogers Elizabeth Drive, Chelmsford, MA 184 Phone: Fax: Web Site:

6 HMC37QS16G 1 LSB GaAs IC 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz V4.11 FEBRUARY 1 NOTES: 1 Elizabeth Drive, Chelmsford, MA 184 Phone: Fax: Web Site: