AT20-0107 Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver DC - 2.0 GHz Features • • • • • • • CR-13 Attenuation: 0.5 dB Steps to 31.5 dB1 Temperature Stability: ±0.18 dB from –40ºC to +85ºC Typ. Low DC Power Consumption Surface Mount Package Integral TTL Driver High Intercept Point Low Cost/High Performance Description M/A-COM's AT20-0107 is a GaAs FET 6-bit digital attenuator with a 0.5 dB minimum step size and a 31.5 dB total attenuation. This attenuator and integral TTL driver is in a ceramic 24-lead surface mount package. The AT20-0107 is ideally suited for use where accuracy, fast speed, very low power consumption and low intermodulation products are required. Typical applications include dynamic range setting in precision receiver circuits and other gain/ leveling control circuits. Available with enhanced performance as fully hermetic version. Environmentally screenable as P/N AT-107. Ordering Information Part Number AT20-0107 AT20-0107-TR AT20-0107-TB Package Bulk Packaging Tape and Reel2 Unit mounted on a test board 2. Check with the factory for available quantities and reel size. Electrical Specifications3 TA = +25°C Parameter Test Conditions Frequency Units Min Typical Max Insertion Loss — — — DC - 0.5 GHz DC - 1.0 GHz DC - 2.0 GHz dB dB dB — — — 2.5 2.9 3.2 3.0 3.4 3.8 Attenuation Accuracy4,5 Any Bit or Combination of Bits DC - 2.0 GHz dB — — +(.3 +7% of atten.) -(.2 +1% of atten.) VSWR Full Range DC - 2.0 GHz Ratio — — 1.8:1 nS nS — — 50 150 — — Trise, Tfall Ton, Toff 10% to 90% 50% Control to 90%/10% RF 1. Above reference insertion loss. 3. All specifications apply when operated with bias voltages of +5V for VCC and –5.0 V to –8.0 V for VEE and 50Ω impedance at all ports unless otherwise stated. Specifications subject to change without notice. North America: Tel. (800) 366-2266, Fax (800) 618-8883 Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 4. This attenuator is guaranteed monotonic. 5. For the attenuator to meet the guaranteed specifications, it is necessary to have a DC return on either RF1 or RF2. The DC return can be either a 10KΩ resistor, or an RF choke. 6. VEE = -5 V for the typical numbers given. V 3.00 AT20-0107 Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver DC - 2.0 GHz Electrical Specifications TA = +25°C Parameter Test Conditions Frequency Units Min Typical Max Input Power Input Power 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +75 +79 — — Input IP36 Two-tone inputs up to +5 dBm 50 MHz 0.5-2.0 GHz dB dB — — +35 +48 — — Input IP26 Two-tone inputs up to +5 dBm 50 MHz 0.5-2.0 GHz dB dB — — +75 +79 — — Vcc -Vee — — — — V V 4.5 -8.0 5.0 — 5.5 -5.0 1 dB Compression 6 Icc Vcc = 4.5 to 5.5 V mA — — 6.0 -Iee -Vee = -5.0 to –8.0 V mA — — 1.0 Absolute Maximum Ratings 7 Functional Schematic (Top View) Parameter Absolute Maximum Max. Input Power 0.05 GHz 0.5 - 2.0 GHz +27 dBm +34 dBm +Vcc +5.5V -Vee -8.5V Control Voltage -0.5V to VCC +0.5V Operating Temperature -40°C to +125°C Storage Temperature -65°C to +150°C 7. Operation of this device above any one of these parameters may cause permanent damange. Truth Table C16 C8 C4 C2 C1 C0.5 Attenuation 0 0 0 0 0 0 Loss, Reference 0 0 0 0 0 1 0.5 dB 0 0 0 0 1 0 1.0 dB 0 0 0 1 0 0 2.0 dB 0 0 1 0 0 0 4.0 dB 0 1 0 0 0 0 8.0 dB 1 0 0 0 0 0 16.0 dB 1 1 1 1 1 1 31.5 dB 0 = TTL Low; 1 = TTL High Specifications subject to change without notice. North America: Tel. (800) 366-2266, Fax (800) 618-8883 Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. V 3.00 Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver DC - 2.0 GHz AT20-0107 Typical Performance Attenuation Accuracy vs. Frequency Insertion Loss vs Frequency 1 dB 4 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 +85 °C 3 2 +25 °C 1 -40 °C 0 0 0.5 1 1.5 0.5 Attenuation Accuracy vs. Frequency 0.5 1 1.5 2 2 dB 0 Frequency (GHz) 4 dB Loss & .5 dB 1 & 2 dB 0 0.5 2 0.5 8 & 16 dB 1 dB 1 1.5 2 Frequency (GHz) PCB Layout RF2 VSWR vs. Frequency 2 1.8 1.6 1.4 1.2 1 4 dB Loss & .5 dB 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0 1.5 RF1 VSWR vs. Frequency 31.5 dB 8 dB 1 Frequency (GHz) Frequency (GHz) 16 dB .5 dB 2 dB 0 2 4 dB 16 dB 8 1 1.5 2 Frequency (GHz) Specifications subject to change without notice. North America: Tel. (800) 366-2266, Fax (800) 618-8883 Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. V 3.00