Digital Attenuator, 1-Bit, 15 dB DC-2.0 GHz Features • • • • • AT-267 V4 Functional Schematic Single 15-dB Step Low Loss, 0.3 dB Typical @ 900 MHz 2.5 to 5.0 Volt Operation SOT-25 Plastic Package Tape and Reel Packaging Available 5 4 Description M/A-COM’s AT-267 is a 1-bit, 15-dB step GaAs MMIC digital attenuator in a low cost SOT-25, 5 lead surface mount plastic package. The AT-267 is ideally suited for use where high accuracy, very low power consumption and low intermodulation products are required. 1 2 3 Typical applications include wireless handsets, base stations, wireless LAN equipment, GPS receivers and any RF applications with automatic gain/level control circuits. The AT-267 is fabricated as a monolithic GaAs integrated circuit using a mature PHEMT process. The process features full chip passivation for performance and reliability. Pin Configuration Pin No. Function Pin No. Function 1 RF1 4 V1 2 Ground 5 V2 3 RF2 Absolute Maximum Ratings 2 Ordering Information 1 Part Number Package AT-267TR Tape and Reel (1K Reel) AT-267TR-3000 Tape and Reel (3K Reel) AT-267SMB Sample Board 1. Reference Application Note M513 for reel size information. 1 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. Parameter Absolute Maximum Input Power +21 dBm Control Voltage VC ≤ 8V Operating Temperature -40°C to +85°C Storage Temperature -65°C to +150°C 2. Exceeding any one or combination of these limits may cause permanent damage to this device. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. Digital Attenuator, 1-Bit, 15 dB DC-2.0 GHz AT-267 V4 Electrical Specifications3: TA = 25°C, VC = +2.5 Volts, Z0 = 50 Ω Parameter Test Conditions Units Min Typ Max Insertion Loss (Reference State) 1.0 GHz 2.0 GHz dB — — 0.3 0.4 0.4 0.5 Attenuation 1.0 GHz 2.0 GHz dB dB 14.6 14.4 15.1 14.9 15.6 15.4 VSWR 1.0 GHz 2.0 GHz Ratio Ratio — — 1.2:1 1.3:1 — — Input IP3 1.0 GHz Insertion Loss State Attenuation State dBm dBm 40 40 50 50 — — P1dB 1.0 GHz Insertion Loss State Attenuation State dBm dBm 24 20 26 23 — — Control Current — µA — — 10 Trise, Tfall 10% to 90% RF, 90% to 10% RF nS — 29 — Ton, Toff 50% Control to 90% RF, 50% Control to 10% RF nS — 50 — Transients In-band mV — 10 — 3. For positive voltage control, external DC blocking capacitors are required on all RF ports (pins 1, 2 and 3). Positive Control Voltage Schematic SOT-25 5 1 39 pF 4 2 39 pF 3 39 pF Truth Table 4,5 Mode (Control) V1 V2 Attenuation Positive 4 0 ± 0.2V +2.5V to +5V +2.5V to +5V 0 ± 0.2V 15 dB Reference State Negative 5 0 ± 0.2V -2.5V to -5V -2.5V to -5V 0 ± 0.2V Reference State 15 dB 4. External DC blocking capacitors are required as noted. 5. If negative control is used, DC blocking capacitors are not required on RF ports and ground. 2 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. Digital Attenuator, 1-Bit, 15 dB DC-2.0 GHz AT-267 V4 Typical Performance Curves Insertion Loss vs. Frequency over Temperature with Negative Control +85C -40C +25C 1.0 1.0 0.8 0.8 Insertion Loss (dB) Insertion Loss (dB) +25C Insertion Loss vs. Frequency over Temperature with Positive Control 0.6 0.4 0.2 0.0 0.6 0.4 0.2 0.5 1.0 1.5 2.0 2.5 0.0 3.0 0.5 1.0 Attenuation vs. Frequency over Temperature with Negative Control +25C +85C 1.5 2.0 2.5 3.0 Frequency (GHz) Frequency (GHz) Attenuation vs. Frequency over Temperature with Positive Control -40C +25C 17 17 16 16 Attenuation (dB) Attenuation (dB) -40C 0.0 0.0 15 14 13 12 +85C -40C 15 14 13 12 0.0 0.5 1.0 1.5 2.0 2.5 0.0 3.0 0.5 VSWR, 0 and 15 dB States with Negative Control at +25°C 0dB 1.0 1.5 2.0 2.5 3.0 Frequency (GHz) Frequency (GHz) VSWR, 0 and 15 dB States with Positive Control at +25°C 0dB 15dB 2.0 2.0 1.8 1.8 1.6 1.6 VSWR VSWR +85C 1.4 15dB 1.4 1.2 1.2 1.0 1.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Frequency (GHz) 3 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Frequency (GHz) • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information.