HMC235QS16G MICROWAVE CORPORATION GaAs MMIC SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 2001 Features General Description WIDE BANDWIDTH: DC - 4 GHz ATTENUATION BITS: 1, 2, 4, 8, 16 dB MINIATURE QSOP-16 PACKAGE SMT ATTENUATORS 2 The HMC235QS16G is a broadband 5-bit digital attenuator in a 16 - lead (narrow pitch) surface mount QSOP plastic package with an exposed ground slug. This package occupies the same area as an 8 lead SOIC package. The 1, 2, 4 and 8 dB bits have less than 10 degrees relative phase shift. The five primary attenuation states can be activated independently, or collectively for attenuation levels of 1 to 31 dB. The HMC235QS16G is ideal for cellular, PCS, WLL, LMDS and IF applications.This is the smallest 5 bit digital attenuator available. Guaranteed Performance With 0/-5V Control, -40 to +85 deg C Parameter Frequency Insertion Loss DC- 2 GHz 2 - 4 GHz Min. Typ. Max. Units 5.0 5.3 5.4 6.0 dB dB Attenuation Range DC- 4 GHz 25 31 dB Input Return Loss (All States) DC- 2 GHz 2 - 4 GHz 7 4 12 7 dB dB Output Return Loss (All States) DC- 2 GHz 2 - 4 GHz 10 7 18 11 dB dB 0.1 - 2 GHz 0.5 1.4 3.2 7.0 14.0 26.0 1 2 4 8 16 31 1.5 2.6 4.8 9.0 17.9 35.0 dB dB dB dB dB dB 2 - 4 GHz 0.5 1.3 3.2 7.0 14.0 25.0 1 2 4 8 16 31 1.5 2.7 4.8 9.0 17.9 35.0 dB dB dB dB dB dB Attenuation Accuracy: 1 dB Bit 2 dB Bit 4 dB Bit 8 dB Bit 16 dB Bit All Bits (31 dB) Attenuation Accuracy: 1 dB Bit 2 dB Bit 4 dB Bit 8 dB Bit 16 dB Bit All Bits (31 dB) Switching Characteristics tRISE, tFALL (10/90%) tON, tOFF (50% CTL to 10/90% RF) DC- 4 GHz 3 6 ns ns Input Power for 0.2 dB Compression 0.05 GHz Min. Atten. State 0.05 GHz All Atten. States 0.5 - 4 GHz Min. Atten. State 0.5 - 4 GHz All Atten. States 8 7 18 7 12 11 24 12 dBm dBm dBm dBm Input Third Order Intercept Point each tone = +5dBm typ. 0.05 GHz Min. Atten. State 0.05 GHz All Atten. States 0.5 - 4 GHz Min. Atten. State 0.5 - 4 GHz All Atten. States 24 23 38 22 28 30 44 32 dBm dBm dBm dBm 12 Elizabeth Drive, Chelmsford, MA 01824 2 - 44 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com HMC235QS16G MICROWAVE CORPORATION HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 2001 Insertion Loss Relative Attenuation 0 INSERTION LOSS (dB) -1 -2 -3 -40 C +25 C -4 -5 -6 -5 -10 2 dB 4 dB 2 8 dB -20 16 dB -25 -30 31 dB +85 C -35 -7 0 0.5 1 1.5 2 2.5 3 3.5 0 4 0.5 1 1.5 Input + Output Return Loss (Reference State) 2.5 3 3.5 4 Relative Phase 0 70 INPUT RETURN LOSS 60 31 dB -10 PHASE (DEGREES) OUTPUT RETURN LOSS (dB) 2 FREQUENCY (GHz) FREQUENCY (GHz) -20 OUTPUT RETURN LOSS -30 50 40 1, 2, 4 dB 30 16 dB 8 dB 20 10 -40 0 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 FREQUENCY (GHz) 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) Input Return Loss Output Return Loss 0 OUTPUT RETURN LOSS (dB) 0 31 dB INPUT RETURN LOSS (dB) 1 dB -15 4 dB -10 -20 REF. STATE -30 16 dB REF. STATE -10 -20 4 dB -30 31 dB 2 dB -40 -40 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 12 Elizabeth Drive, Chelmsford, MA 01824 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz) Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 45 SMT ATTENUATORS RELATIVE ATTENUATION (dB) 0 HMC235QS16G MICROWAVE CORPORATION HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 2001 Input Power for 0.2 dB Compression (Minimum Attenuation) Input Power for 0.2 dB Compression (Maximum Attenuation) 30 0.2 dB COMPRESSION (dBm) -40 OC 25 20 +25OC +85OC 15 10 5 25 -40 OC 20 15 10 +85OC +25OC 5 0 0 0 0.5 1 1.5 2 2.5 3 3.5 0 4 0.5 1 1.5 2 2.5 3 3.5 4 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz) IP3 (Minimum Attenuation) IP3 (Maximum Attenuation) 60 60 +85OC +25OC 50 50 +85OC 40 IP3 (dBm) IP3 (dBm) SMT ATTENUATORS 2 0.2 dB COMPRESSION (dBm) 30 -40 OC 30 40 30 20 20 10 10 -40 OC 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) 12 Elizabeth Drive, Chelmsford, MA 01824 2 - 46 +25OC 0 0.5 1 1.5 2 2.5 3 FREQUENCY (GHz) Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com HMC235QS16G MICROWAVE CORPORATION HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 2001 Schematic 1dB 4dB A3 (13) A4 (12) B4 (11) A5 (10) B5 (9) 2dB 8dB 2 16dB SMT ATTENUATORS A2 (14) RF2 (7) RF1 (2) A1 (16) B1 (15) HMC235 GND GND GND GND GND Pins 1, 3 - 6 and 8 are GND. Absolute Maximum Ratings Control Voltage Range +0.5 to -8.5 Vdc Storage Temperature -65 to +150 deg C Operating Temperature RF Input Power (0.5 - 4 GHz) Insertion Loss State Any Attenuation State -40 to +85 deg C Truth Table +27 dBm +13 dBm Control Voltages State Bias Condition Low 0 to -0.2V@20uA Max High -3V@50uA Typ to -8V@500uA Max Control Input 8dB Bit 16dB Bit Att S et 4 dB Bit 1d B 2d B A1 B1 A2 A3 A4 B4 A5 B5 Hi Lo Hi Hi Hi Lo Hi Lo R ef Hi Lo Lo Hi Hi Lo Hi Lo 1dB Hi Lo Hi Lo Hi Lo Hi Lo 2dB Lo Hi Hi Hi Hi Lo Hi Lo 4dB Hi Lo Hi Hi Lo Hi Hi Lo 8dB Hi Lo Hi Hi Hi Lo Lo Hi 16dB Any combination of above states will provide an attenuation approximately equal to the sum of the bits selected. 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 47 HMC235QS16G MICROWAVE CORPORATION HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 2001 Outline EXPOSED GROUND SLUG (CONNECT TO RF GROUND PLANE) 0.189/0.197 (4.80/5.00) DATE CODE YY = YEAR 2 SMT ATTENUATORS 0.150/0.157 (3.81/3.99) HMC235 YYWW ZZZZ WW = WEEK 0.228/0.224 (5.76/6.20) 0.080 (2.03) LOT NUMBER 0.037 ± 0.015 (0.94 ± 0.38) PIN 1 0.105 (2.67) PIN 1 0.044 ± 0.015 (1.12 ± 0.38) 0.004 / 0.010 (0.1 / 0.25) TYP 0.051/0.059 (1.30 / 1.50) 0.0256 (.65) 0.010 (0.025) 0.000/0.004 (0.00/0.10) 0.016 (0.41) MIN TYP 1. 2. 3. MATERIAL: A) PACKAGE BODY - LOW STRESS INJECTION-MOLDED PLASTIC. 4. 5. B) LEADFRAME AND SLUG MATERIAL: COPPER ALLOY PLATING : LEAD - TIN SOLDER PLATE (LEAD AND SLUG) DIMENSIONS ARE IN INCHES (MILLIMETERS). UNLESS OTHERWISE SPECIFIED ALL TOL. ARE ±0.005(±0.13). DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15 MM PER SIDE DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25 MM PER SIDE Suggested Driver Circuit 100Ω * Vz=5.1V Izt=50uA Ax COMPENSATED 100pF * DEVICES CD4689 TTL OR CMOS VCC VCC GND GND GaAs ATTENUATOR CONTROL 100Ω* Bx 10K 74HCT04 (TTL) 74HC04 (CMOS) 100pF* -5 VDC Simple driver using inexpensive standard logic ICs provides fast switching using minimum DC current. * Recommended values to suppress unwanted RF signals at Ax/Bx control lines. Component values may be adjusted for switching speed considerations. 12 Elizabeth Drive, Chelmsford, MA 01824 2 - 48 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com HMC235QS16G MICROWAVE CORPORATION HMC235QS16G SMT 5 - BIT DIGITAL ATTENUATOR DC - 4 GHz FEBRUARY 2001 Evaluation Circuit Board SMT ATTENUATORS 2 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 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 Layout Technique Grounded Co-Planar Waveguide (GCPW) Material Rogers 4350 Dielectric Thickness 0.020" (0.51 mm) 50 Ohm Line Width 0.034" (0.86 mm) Gap to Ground Edge 0.010" (0.25 mm) Ground VIA Hole Diameter 0.014" (0.36 mm) Connectors SMA-F ( EF - Johnson P/N 142-0701-806) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 49