AT20-0263 Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 2 GHz Features V 3.00 CR-12 n Attenuation: 1 dB steps to 31 dB n Temperature Stability: ± 0.18 dB from –40°C to +85°C n n n n n Typical Low DC Power Consumption Surface Mount Package Integral TTL Driver Low Cost/High Performance 50 Ohm Nominal Impedance Description M/A-COM’s AT20-0263 is a GaAs FET 5-bit digital attenuator with a 1 dB minimum step size and 31 dB total attenuation. This attenuator and integral TTL driver is in a ceramic 16-lead surface mount package. The AT20-0263 is ideally suited for use where accuracy, fast switching, 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-263. Electrical Specifications: TA = 25°C1 Parameter Test Conditions Frequency Units Min Typ Max Reference Insertion Loss — DC - 0.5 GHz DC - 1.0 GHz DC - 2.0 GHz dB dB dB — — — 2.0 2.2 2.5 2.4 2.8 3.0 Attenuation Accuracy 2 Any Single Bit Any Combination of Bits DC - 1.0 GHz DC - 2.0 GHz ± (0.25 +3% of atten setting in dB) dB ± (0.25 +3% of atten setting in dB) dB or ± 0.4 dB, whichever is greater VSWR — DC - 2.0 GHz Ratio — — 1.6:1 Trise, Tfall 10% to 90% — ns — 50 — Ton, Toff 50% Control to 90/10% RF — ns — 150 — Transients In-Band (peak-peak) — mV — 50 — 1 dB Compression Input Power Input Power 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +20 +28 — — Input IP3 For two-tone Input Power Up to +5 dBm 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +40 +48 — — Input IP2 For two-tone Input Power Up to +5 dBm 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +45 +68 — — Vcc — — V 4.5 5.0 5.5 Vee — — V -8.0 — -5.0 1. All specifications apply when operated with bias voltages of +5V for Vcc and –5.0V for Vee. 2. This attenuator is guaranteed monotonic. Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 2 GHz AT20-0263 V 3.00 Electrical Specifications: TA = 25°C Parameter Test Conditions Frequency Units Min Typ Max Icc Vcc = 4.5 to 5.5V Vctl = 0 to 0.8V, or Vcc –2.1V to Vcc — mA — — 5.0 Iee Vee = -5.0 to -8.0V — mA — — 1.0 Absolute Maximum Ratings 3 Parameter Absolute Maximum Max Input Power 0.5 GHz 0.5 - 2.0 GHz +27 dBm +34 dBm Supply Voltages Vcc Vee +5.5V -8.5V Control Voltage 4 Operating Temperature Storage Temperature Truth Table Control Inputs C5 C4 C3 C2 C1 Attenuation 0 0 0 0 0 Reference 0 0 0 0 1 1 dB 0 0 0 1 0 2 dB -0.5V to Vcc +0.5V 0 0 1 0 0 4 dB -40°C to +125°C 0 1 0 0 0 8 dB -65°C to +150°C 1 0 0 0 0 16 dB 1 1 1 1 1 31 dB 3. Operation of this device above any one of these parameters may cause permanent damage. 4. Standard CMOS TTL interface, latch-up will occur if logic signal is applied prior to power supply. 0 = TTL Low 1 = TTL High Functional Schematic (Top View) C5 RF2 16 dB +5V -5V C4 GND 8 dB 4 dB C3 C2 GND GND GND 2 dB GND GND Orientation Mark C1 1 dB PIN 16 GND RF1 PIN 1 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, 31 dB, 5-Bit, TTL Driver, DC - 2 GHz AT20-0263 V 3.00 Typical Performance Curves Ref. Insertion Loss vs. Frequency +25°C -55°C Deviation from Nominal Atten (dB) +85°C 5 4 Loss (dB) Attenuation Accuracy vs. Frequency 3 2 1 0 0.0 0.5 1.0 1.5 2.0 1,2,4,8,16 dB Full Attenuation 0.5 0 -0.5 -1 -1.5 0.0 0.5 Frequency (GHz) VSWR vs. Frequency 4 dB State 1.0 1.5 2.0 Frequency (GHz) Ordering Information 1 dB State 2.00 Part Number Package AT20-0263 CR-12 VSWR 1.80 1.60 1.40 1.20 1.00 0.00 0.50 1.00 1.50 2.00 Frequency (GHz) 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. 3