AT-232 Digital Attenuator, 30 dB, 4-Bit, DC - 2 GHz Features V 3.00 CR-6 n Attenuation: 2 dB steps to 30 dB n Temperature Stability: ± 0.18 dB from –55°C to +85°C n n n n Typical Low DC Power Consumption Hermetic Surface Mount Package Fast Switching Speed, 12 ns Typical 50 Ohm Nominal Impedance Description M/A-COM’s AT-232 is a GaAs FET 4-bit digital attenuator with a 2 dB minimum step size and 30 dB total attenuation. This attenuator is in a hermetically sealed ceramic 16-lead surface mount package. The AT-232 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. Environmental screening is available. Contact the factory for information. Electrical Specifications1 (From –55°C to +85°C) 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 2.3 2.5 Attenuation Accuracy 2 Any Single Bit DC - 1.0 GHz DC - 2.0 GHz Any Combination of Bits DC - 1.0 GHz DC - 2.0 GHz VSWR — DC - 2.0 GHz Ratio — — 1.6:1 Trise, Tfall 10% to 90% — ns — 12 — Ton, Toff 50% Control to 90/10% RF — ns — 18 — ± (0.15 dB +3% of atten setting in dB) dB ± (0.2 dB +3% of atten setting in dB) dB Or ± 0.45 dB, whichever is greater ± (0.22 dB +3% of atten setting in dB) dB ± (0.25 dB +4% of atten setting in dB) dB Or ± 0.45 dB, whichever is greater Transients In-Band (peak-peak) — mV — 25 — 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 +50 — — Input IP2 For two-tone Input Power Up to +5 dBm 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +45 +68 — — 1. All specifications apply when operated with control votlages of 0.0V to -5.0V. 2. This attenuator is guaranteed monotonic. Digital Attenuator, 30 dB, 4-Bit, DC - 2 GHz AT-232 V 3.00 Electrical Specifications (From –55°C to +85°C) Parameter Test Conditions Frequency Units Min Typ Max Input Leakage Current (Low) -0.2 to 0V — µA — — 20 Input Leakage Current (High) -8.0 to -5.0V — µA — — 200 /VC1 VC1 Atten. (dB) Absolute Maximum Ratings 3 Parameter Absolute Maximum Max Input Power 0.05 GHz 0.5 - 2.0 GHz +27 dBm +34 dBm Control Voltage +0.5V, -8.5V Operating Temperature -55°C to +125°C Storage Temperature -65°C to +150°C 3. Operation of this device above any one of these parameters may cause permanent damage. Truth Table Control Inputs /VC4 VC4 /VC3 VC3 /VC2 VC2 -5V 0V -5V 0V -5V 0V -5V 0V Ref. 0V -5V -5V 0V -5V 0V -5V 0V 2 dB -5V 0V 0V -5V -5V 0V -5V 0V 4 dB -5V 0V -5V 0V 0V -5V -5V 0V 8 dB -5V 0V -5V 0V -5V 0V 0V -5V 16 dB 0V -5V 0V -5V 0V -5V 0V -5V 30 dB Functional Schematic (Top View) VC1 RF1 16 dB /VC1 GND VC2 GND 8 dB /VC2 VC3 GND 4 dB /VC3 VC4 GND GND 2 dB /VC4 GND Orientation Mark RF2 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, DC - 2 GHz AT-232 V 3.00 Typical Performance Curves VSWR vs. Frequency Ref. Insertion Loss vs. Frequency -55°C +25°C 2 dB +85°C 4 dB 8 dB Insertion Loss 1.5 3 1.4 2 1.3 1.2 1 1.1 1.0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 Attenuation Accuracy vs. Frequency 2 dB 16 dB 4 dB 8 dB 1.0 1.5 2.0 2.5 3.0 Frequency (GHz) Frequency (GHz) Deviation from Nominal Atten (dB) 16 dB 30 dB 1.6 VSWR Insertion Loss (dB) 4 Ordering Information 30 dB 3.00 2.50 2.00 Part Number Package AT-232 PIN CR-6 1.50 1.00 0.50 0.00 -0.50 -1.00 0.0 0.5 1.0 1.5 2.0 2.5 3.0 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