AT-233 Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2 GHz Features V 3.00 CR-12 2 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 Integral TTL Driver 50 Ohm Nominal Impedance Description M/A-COM’s AT-233 is a GaAs FET 4-Bit digital attenuator with a 2 dB minimum step size and 30 dB total attenuation. This attenuator and integral TTL driver is in a hermetically sealed ceramic 16-lead surface mount package. The AT-233 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 Specifications: TA = 25°C1 Parameter Test Conditions Reference Insertion Loss Attenuation Accuracy3 Any Single Bit Any Combination of Bits VSWR Frequency Units Min Typ Max DC - 0.5 GHz DC - 1.0 GHz DC - 2.0 GHz dB dB dB — — — — — — 2.3 2.65 2.8 DC - 1.0 GHz DC - 2.0 GHz ± (0.2 + 3% of attenuation setting in dB) dB ± (0.2 + 3% of attenuation setting in dB) dB or ± 0.45 dB, whichever is greater DC - 1.0 GHz ± (0.20 + 3% of attenuation setting in dB) dB DC - 2.0 GHz ± (0.25 + 4% of attenuation setting in dB) dB or ± 0.45 dB, whichever is greater DC - 2.0 GHz Ratio — — 1.7:1 ns — 10 — Trise, Tfall 10% to 90% — Ton, Toff 50% Control to 90/10% RF — ns — 30 — Transients In-Band (peak-peak) — mV — 35 — Input Power 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +20 +28 — — Input IP3 4 For two tone input power Up to +5 dBm 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +40 +50 — — Input IP2 4 For two-tone input power Up to +5 dBm 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +45 +68 — — 1 dB Compression 4 1. All specifications apply when operated with bias voltages of +5V or VCC and –5.0V to –8.0V for VEE, and 50 Ohm impedance at all ports unless otherwise specified. 2. Above reference insertion loss. 3. This attenuator is guaranteed monotonic. 4. VEE = -5V for the typical numbers given. Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2 GHz AT-233 V 3.00 Electrical Specifications: TA = 25°C1 Parameter Test Conditions VCC VEE Frequency Units Min Typ Max — V 4.5 5.0 5.5 — V -8.0 — -5.0 ICC VCC = 4.5 to 5.5 V Vctl = 0 to 0.8V, or VCC –2.1V to VCC — mA — — 4.0 IEE VEE = -5.0 to –8.0V — mA — — 1.0 Vctl Logic 0 (TTL) Logic 1 (TTL) — — V V 0.0 2.0 — — 0.8 5.0 Input Leakage Current (Low) Input Leakage Current (High) 0 to 0.8V 2.0 to 5.0V — — µA µA — — — — 1.0 1.0 Absolute Maximum Ratings 5 Functional Schematic (Top View) 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 C4 RF2 NC 16 dB +5V GND GND -5V 8 dB Control Voltage -0.5V to VCC + 0.5V C3 Operating Temperature -55°C to +125°C C2 Storage Temperature -65°C to +150°C 5. Operation of this device above any one of these parameters may cause permanent damage. GND GND 4 dB GND C1 GND 2 dB RF1 GND PIN 16 PIN 1 Truth Table Control Inputs C4 C3 C2 C1 Attenuation 0 0 0 0 Reference 0 0 0 1 2 dB 0 0 1 0 4 dB 0 1 0 0 8 dB 1 0 0 0 16 dB 1 1 1 1 30 dB 0 = TTL Low 1 = TTL High 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 GHz AT-233 V 3.00 Typical Performance Curves Ref. Insertion Loss vs. Frequency +25°C 2 dB -55°C 5.0 2.00 4.0 1.80 3.0 1.60 VSWR Insertion Loss (dB) +85°C VSWR vs. Frequency 2.0 8 dB 16 dB Ref Loss State 1.40 1.20 1.0 1.00 0.0 0.0 0.5 1.0 1.5 2.0 0.0 0.5 Attenuation Accuracy vs. Frequency Full Atten 16 dB 8 dB 1.0 1.5 2.0 Frequency (GHz) Frequency (GHz) Deviation from Nominal Attenuation (dB) 4 dB 4 dB Ordering Information 6 2 dB 1.0 Part Number Package 0.5 AT-233 PIN CR-12 0.0 6. Contact the factory for standard or custom screening requirements -0.5 -1.0 -1.5 -2.0 0.0 0.5 1.0 1.5 2.0 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