AT90-1233 Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz Features n n n n n n n n V 1.00 CSP-1 Attenuation: 2 dB Steps to 30 dB Single Positive Supply Contains Internal DC to DC Converter Small Footprint, JEDEC Package Integral TTL Driver 50 Ohm Impedance Test Boards Available Tape and Reel Packaging Available Description M/A-COM’s AT90-1233 is a GaAs FET 4-Bit digital attenuator with integral driver. Step size is 2 dB providing a 30 dB attenuation range. This device is in an FQFP-N plastic surface mount package. The AT90-1233 is suited for single supply applications where accuracy, fast speed, low power consumption and low costs are required. Electrical Specifications TA = +25°C Parameter Test Conditions Frequency Units Min Typical Max Insertion Loss — DC - 2.5 GHz dB — 2.7 3.0 Attenuation Accuracy Individual Bits or Combination of Bits DC - 2.5 GHz dB — — ±(.3 +5% of atten setting) VSWR Full Range DC - 2.5 GHz Ratio — 1.5:1 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 - 2.5 GHz dBm dBm — — +21 +29 — — Input IP3 Two-tone inputs up to +5 dBm 50 MHz 0.5 - 2.5 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, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz AT90-1233 V 1.00 Recommended PCB Layout 7 Pin Configuration Pin No. Function Pin No. Function 1 GND 17 N/C 2 C16 18 N/C 3 C8 19 +VCC2 4 C4 20 N/C 5 C2 21 Cp4 6 GND 22 N/C 7 GND 23 Cp4 8 N/C 24 N/C 9 N/C 25 -VEE3 10 N/C1 26 GND 11 GND 27 RF2 12 RF1 28 GND 13 GND 29 N/C1 14 N/C 30 -VEE3,5 15 N/C 31 N/C 16 1. 2. 3. 4. 5. 6. N/C 32 +VCC 2,6 Pins 10 and 29 must be isolated. Pin 19 must be connected to Pin 32. Pin 25 must connect to Pin 30. A .01 µF cap must be connected between Pins 21 and 23. -VEE is produced internally and requires a .1 µF cap to GND. +VCC requires a .1 µF cap to GND. Truth Table 7. Application Note C2083 is available on line at www.macom.com Absolute Maximum Ratings 8 Parameter Absolute Maximum Max. Input Power 0.05 GHz 0.5 - 2.5 GHz +27 dBm +34 dBm +Vcc +5.5V -Vee -8.5V 9 C16 C6 C4 C2 Attenuation 0 0 0 0 Loss, Reference Operating Temperature -40°C to +85°C 0 0 0 1 2.0 dB Storage Temperature -65°C to +125°C 0 0 1 0 4.0 dB 0 1 0 0 8.0 dB 1 0 0 0 16.0 dB 1 1 1 1 30.0 dB Logic Voltages -0.5 to +Vcc + 0.5V 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. 0 = TTL Low; 1 = TTL High Ordering Information Part Number Package AT90-1233 Bulk Packaging AT90-1233TR Tape and Reel (1K Reel) AT90-1233-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. 2 Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz AT90-1233 V 1.00 Typical Performance Curves Insertion Loss VSWR @ Insertion Loss Output Input 1.60 2.50 1.40 VSWR Attenuation (dB) 3.00 2.00 1.20 1.50 1.00 1.00 0 500 1000 1500 2000 0 2500 500 1000 1500 2000 2500 Frequency (MHz) Frequency (MHz) Attenuation Error, 4 dB Bit Attenuation Error, 2 dB Bit 0.30 0.40 Attenuation (dB) Attenuation (dB) 0.20 0.10 0.00 -0.10 0.20 0.00 -0.20 -0.20 -0.30 -0.40 0 500 1000 1500 2000 2500 0 500 Frequency (MHz) 1500 2000 2500 Attenuation Error, 16 dB Bit Attenuation Error, 8 dB Bit 0.40 0.00 0.20 -0.20 Attenuation (dB) Attenuation (dB) 1000 Frequency (MHz) 0.00 -0.20 -0.40 -0.40 -0.60 -0.80 0 500 1000 1500 2000 2500 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, 30 dB, 4-Bit, TTL Driver, DC - 2.5 GHz AT90-1233 V 1.00 Typical Performance Curves Attenuation Error, Max. Attenuation VSWR, 2 dB Bit Output 0.50 0.00 1.40 VSWR Attenuation (dB) Input 1.60 -0.50 1.20 -1.00 -1.50 0 500 1000 1500 2000 1.00 2500 0 500 1000 2000 2500 2000 2500 VSWR, 8 dB Bit VSWR, 4 dB Bit Output 1500 Frequency (MHz) Frequency (MHz) Output Input 1.60 1.40 1.40 VSWR VSWR 1.60 Input 1.20 1.20 1.00 1.00 0 500 1000 1500 2000 0 2500 500 Frequency (MHz) 1000 1500 Frequency (MHz) VSWR, Maximum Attenuation VSWR, 16 dB Bit Output Input Output 1.60 1.40 1.40 VSWR VSWR 1.60 Input 1.20 1.20 1.00 1.00 0 500 1000 1500 2000 2500 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) 4