v..5 LSB GaAs MMIC 6-BIT DIGITAL Typical Applications The is ideal for: 3G Infrastructure & access points Cellular/3G, LTE & UMB WiMAX, WiBN & Fixed Wireless Test Equipment and Sensors GSM, WCDMA & TD-SCDMA Functional Diagram Features.5 LSB Steps to 3.5 Single Control Line Per Bit TTL/CMOS Compatible Control ±.5 Typical Step Error Single +5V Supply 4 Lead Ceramic 4x4mm SMT Package: 6mm² General Description The are broadband 6-bit GaAs IC digital attenuators in low cost leadless surface mount packages. This single positive control line per bit digital attenuator incorporates off chip AC ground capacitors for near DC operation, making it suitable for a wide variety of RF and IF applications. Covering DC to 3.8 GHz, the insertion loss is less than. typical. The attenuator bit values are.5 (LSB),,, 4, 8, and 6 for a total attenuation of 3.5. Attenuation accuracy is excellent at ±.5 typical step error with an IIP3 of +54 m. Six TTL/ CMOS control inputs are used to select each attenuation state. A single Vdd bias of +5V is required. Electrical Specifications, T A = +5 C, With Vdd = +5V & Vctl = /+5V (Unless Otherwise Noted) Insertion Loss Parameter Frequency (GHz) Min. Typ. Max. Units DC -.5 GHz.5-3. GHz 3. - 3.8 GHz Attenuation Range DC - 3.8 GHz 3.5 Return Loss (RF & RF, All Atten. States) DC - 3.8 GHz Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States.5-3.5 States 4. - 3.5 States All Attenuation States All Attenuation States DC -. GHz. -. GHz. -. GHz. - 3. GHz 3. - 3.8 GHz.4.7.9.8.3 3 ± (.. + 3% of Atten. Setting) Max. ± (.5 + 3% of Atten. Setting) Max. ± (.5 + 4% of Atten. Setting) Max. ± (.3 + 3% of Atten. Setting) Max ± (.35 + 5% of Atten. Setting) Max. Input Power for. Compression. - 3.8 GHz 3 m Input Third Order Intercept Point (Two-Tone Input Power= m Each Tone) Switching Characteristics trise, tfall (/9% RF) ton, toff (5% CTL to /9% RF) REF - 5.5 States 6. - 3.5 States. - 3.8 GHz DC - 3.8 GHz 54 49 4 6 m m ns ns For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com
v..5 LSB GaAs MMIC 6-BIT DIGITAL Insertion Loss Insertion Loss INSERTION LOSS () RETURN LOSS () -.5.5.5-5 5 5 +5C +85C -4C -3.5..5..5.3.35 Return Loss RF, RF INSERTION LOSS () RETURN LOSS () -.5.5.5-3.5.5.5 3 3.5 4-5 5 5.56 +5 C +85 C -4 C Return Loss RF, RF -3-35.5..5..5.3.35-3 3.5-35.5.5.5 3 3.5 4 Normalized Attenuation Normalized Attenuation NORMALIZED ATTENUATION () -5 5 5-3 NORMALIZED ATTENUATION () -5 5 5-3 -35.5..5..5.3.35-35.5.5.5 3 3.5 4 For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com
v..5 LSB GaAs MMIC 6-BIT DIGITAL Bit Error vs. Attenuation State BIT ERROR (). -. -. -.3 -.4 -.5 -.6 -.7 -.8 -.9 5 MHz MHz, 3 MHz, 35 MHz 4 8 6 4 8 3 ATTENUATION STATE () Bit Error vs. Frequency BIT ERROR ().5.5 -.5 8.5-4, 6 MHz 3.5 Bit Error vs. Attenuation State BIT ERROR () BIT ERROR ().5.5 -.5.5 3.5 6 4 MHz 4 8 6 4 8 3 ATTENUATION STATE () Bit Error vs. Frequency 8.5-4 3 GHz, 3.8 GHz MHz, GHz 5 MHz, GHz.5.5..5..5.3.35.5.5.5 3 3.5 4 BIT ERROR () 3.5.5.5 -.5.5.5 Bit Error vs. Frequency without AC Ground Caps.5-4 8-3.5-3.5.5.5 3 3.5 4 3 For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com
v..5 LSB GaAs MMIC 6-BIT DIGITAL Relative Phase vs. Frequency Worst Case Step Error Between Successive Attenuation States RELATIVE PHASE (deg) 8 6 4 3.5-4.5.5.5 3 3.5 4 Bias Voltage & Current Control Voltage State Low High Vdd (V) Note: Vdd = +5V Vdd = +5V ± % 6 8.5-4 Idd (Typ.) (ma) +4.5.4 +5..5 +5.5.6 Bias Condition to +.8 Vdc @ -5 ua Typ. +. to + 5. Vdc @ 4 ua Typ. STEP ERROR ().6. -. -.6.5.5.5 3 3.5 4 Truth Table V 6 V 8 Control Voltage Input V3 4 V4 V5 V6.5 High High High High High High Attenuation State RF - RF Reference I.L. High High High High High Low.5 High High High High Low High High High High Low High High High High Low High High High 4 High Low High High High High 8 Low High High High High High 6 Low Low Low Low Low Low 3.5 Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com 4
v..5 LSB GaAs MMIC 6-BIT DIGITAL Absolute Maximum Ratings RF Input Power (DC - 3 GHz) Outline Drawing +8 m (T = +85 C) Control Voltage Range (V to V6) V to Vdd +V Bias Voltage (Vdd) +7V Channel Temperature 5 C Continuous Pdiss (T = 85 C) (derate 8.6 mw/ C above 85 C) Thermal Resistance.56 W 6 C/W Storage Temperature -65 to +5 C Operating Temperature -4 to +85 C ESD Sensitivity (HBM) Class A ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS Package Information NOTES:. LEADFRAME MATERIAL: COPPER ALLOY. DIMENSIONS ARE IN INCHES [MILLIMETERS] 3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE. 4. PAD BURR LENGTH SHALL BE.5mm MAXIMUM. PAD BURR HEIGHT SHALL BE.5mm MAXIMUM. 5. PACKAGE WARP SHALL NOT EXCEED.5mm. 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 [] [] H47A RoHS-compliant Low Stress Injection Molded Plastic % matte Sn MSL XXXX [] Max peak reflow temperature of 6 C [] 4-Digit lot number XXXX 5 For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com
v..5 LSB GaAs MMIC 6-BIT DIGITAL Pin Descriptions Pin Number Function Description Interface Schematic, 3, 5,, 4, 6, 7, 8 N/C These pins should be connected to PCB RF ground to maximize performance. Vdd Supply Voltage. 4, 5 RF, RF 6 -, 3 ACG - ACG7 This pin is DC coupled and matched to 5 Ohm. Blocking capacitors are required. Select value based on lowest frequency of operation. External capacitors to ground are recommended for low and high frequency operation. Select value for lowest frequency of operation. Place capacitor as close to pins as possible. For operation from 7 to 7 MHz, these pins may be left unconnected. 9-4 V - V6 See truth table and control voltage table. GND Package bottom has an exposed metal paddle that must also be connected to RF/DC Ground. For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com 6
v..5 LSB GaAs MMIC 6-BIT DIGITAL Application Circuit Note: For operations from 7 to 7 MHz, pins 6 through 3 may be left unconnected. 7 For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com
v..5 LSB GaAs MMIC 6-BIT DIGITAL Evaluation PCB List of Materials for Evaluation PCB 7 - HMC47ALP4 [] Item J - J J3 C Description PCB Mount SMA Connector 4 Pin DC Connector pf Capacitor, 63 Pkg. C, C3 pf Capacitor, 4 Pkg. C4 - C7 U PCB [] 33 pf Capacitor, 4 Pkg. Digital Attenuator 6977 Evaluation PCB [] Reference this number when ordering complete evaluation PCB [] Circuit Board Material: Rogers 435 The circuit board used in the 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. 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. For price, delivery and to place orders: Hittite Microwave Corporation, Elizabeth Drive, Chelmsford, MA 84 Phone: 9785-3343 Fax: 9785-3373 Order On-line at www.hittite.com Application Support: Phone: 9785-3343 or apps@hittite.com 8