AT90-1283 Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC-3.5 GHz CSP-1 Features n n n n n n n V 4.00 Attenuation: 0.5 dB Steps to 15.5 dB Single Positive Supply Contains Internal DC to DC Converter Low DC Power Consumption Small Footprint, JEDEC Package Integral TTL Driver 50 ohm Impedance Description M/A-COM's AT90-1283 is a GaAs FET 5-bit digital attenuator with integral TTL driver. Step size is 0.5 dB providing a 15.5 dB total attenuation range. This device is in an FQFP-N plastic surface mount package. The AT901283 is ideally suited for use where accuracy, fast speed, very low power consumption and low costs are required. Electrical Specifications TA = +25°C Parameter Test Conditions Frequency Units Min Typical Max Insertion Loss — DC - 3.5 GHz dB — 2.8 3.2 Attenuation Accuracy Individual Bits 0.5-1-4-8 dB Individual Bit 2 dB Any Combination of Bits 1 to 15.5 dB DC - 3.5 GHz DC - 3.5 GHz DC - 3.5 GHz dB dB dB — — — — — — ±(.3 +5% of atten setting) ±(.4 +10% of atten setting) ±(.5 +7% of atten setting) VSWR Full Range DC - 3.5 GHz Ratio — 1.6:1 1.8:1 Switching Speed 50% Cntl to 90%/10% RF 10% to 90% or 90% to 10% — — nS nS — — 75 20 150 50 1 dB Compression — — 50 MHz 0.5 - 3.5 GHz dBm dBm — — +21 +29 — — Input IP3 Two-tone inputs up to +5 dBm 50 MHz 0.5-3.5 GHz dB dB — — +35 +48 — — +Vcc — — V 4.75 5.0 5.25 Logic “0” Sink Current is 20 µA max. — V 0.0 — 0.8 Logic “1” Source Current is 20 µA max. — V 2.0 — 5.0 Icc Vcc min to max, Logic “0” or “1” — mA — 6 10 Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz AT90-1283 V 4.00 Pin Configuration Recommended PCB Layout 7 Pin # Function Pin # Function 1 GND 17 NC 2 C8 18 NC 3 C4 19 +Vcc2 4 C2 20 NC 5 C1 21 Cp4 6 C0.5 22 NC 7 8 9 GND NC NC 23 24 25 Cp4 NC -Vee3,5 10 NC1 26 GND 11 GND 27 RF2 12 RF1 28 GND 13 14 GND NC 29 30 NC1 -Vee3,5 15 NC 31 NC 16 NC 32 +Vcc2,6 1. 2. 3. 4. 5. 6. Pins 10 & 29 must be isolated Pin 19 must be connected to Pin 32. Pin 25 must be connected to Pin 30. .01 µF cap must be between pins 21 & 23. -Vee produced internally and requires a .1 µF cap to GND. +Vcc requires a .1 µF cap to GND. 7. Application Note C2083 is available on line at www.macom.com Absolute Maximum Ratings 8 Truth Table C8 0 C4 0 C2 0 C1 0 C0.5 0 Attenuation Loss, Reference 0 0 0 0 1 0.5 dB 0 0 0 1 0 1.0 dB 0 0 1 0 0 2.0 dB Parameter Absolute Maximum Max. Input Power 0.05 GHz 0.5 - 3.5 GHz +27 dBm +34 dBm +Vcc +5.5V Logic Voltages 9 -0.5 to +Vcc + 0.5V 0 1 0 0 0 4.0 dB 1 0 0 0 0 8.0 dB Operating Temperature -40°C to +85°C 1 1 1 1 1 15.5 dB Storage Temperature -65°C to +125°C 0 = TTL Low; 1 = TTL High Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 8. Operation of this device above any one of these parameters may cause permanent damange. 9. Standard CMOS TTL interface, latch-up will occur if logic signal is applied prior to power supply. 2 Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz AT90-1283 V 4.00 Typical Performance Curves Insertion Loss VSWR @ Insertion Loss Input 3.0 VSWR Ratio 2.5 Loss (dB) Output 1.75 2.0 1.50 1.25 1.5 1.00 1.0 0 500 1000 1500 2000 2500 3000 0 3500 500 1000 Frequency (MHz) 2000 2500 3000 3500 3000 3500 3000 3500 Frequency (MHz) Attenuation Error, 0.5 dB Bit Attenuation Error, 1 dB Bit 1.0 1.0 0.5 0.5 Error (dB) Error (dB) 1500 0.0 0.0 -0.5 -0.5 -1.0 -1.0 0 500 1000 1500 2000 2500 3000 0 3500 500 1000 1500 2000 2500 Frequency (MHz) Frequency (MHz) Attenuation Error, 4 dB Bit Attenuation Error, 2 dB Bit 1.0 1.0 Error (dB) Error (dB) 0.5 0.0 0.5 0.0 -0.5 -0.5 -1.0 0 500 1000 1500 2000 2500 3000 3500 Frequency (MHz) Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 0 500 1000 1500 2000 2500 Frequency (MHz) 3 Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz AT90-1283 V 4.00 Typical Performance Curves Attenuation Error, Max. Attenuation Attenuation Error, 8 dB Bit 1.0 3.0 Error (dB) 2.0 Error (dB) 0.5 0.0 1.0 0.0 -1.0 -0.5 0 500 1000 1500 2000 2500 3000 0 3500 500 1000 Frequency (MHz) VSWR, 0.5 dB Bit 2500 3000 3500 Input Output 1.6 VSWR Ratio 1.6 VSWR Ratio 2000 VSWR, 1 dB Bit Output Input 1.4 1.2 1.4 1.2 1.0 1.0 0 500 1000 1500 2000 2500 3000 0 3500 500 1000 1500 2000 2500 3000 3500 3000 3500 Frequency (MHz) Frequency (MHz) VSWR, 4 dB Bit VSWR, 2 dB Bit Input Input Output Output 1.6 1.8 1.6 VSWR Ratio VSWR Ratio 1500 Frequency (MHz) 1.4 1.4 1.2 1.2 1.0 0 500 1000 1500 2000 2500 3000 3500 Frequency (MHz) Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 1.0 0 500 1000 1500 2000 2500 Frequency (MHz) 4 Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz AT90-1283 V 4.00 Typical Performance Curves VSWR, Maximum Attenuation VSWR, 8 dB Bit Input Output Input VSWR Ratio VSWR Ratio Output 1.8 1.6 1.4 1.2 1.6 1.4 1.2 1.0 1.0 0 500 1000 1500 2000 2500 3000 3500 Frequency (MHz) 0 500 1000 1500 2000 2500 3000 3500 Frequency (MHz) Ordering Information Part Number Package AT90-1283 Bulk Packaging AT90-1283TR Tape and Reel (1K Reel) AT90-1283-TB Units Mounted on Test Board Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 5