AT-283 Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz Features n n n n n n V 5.00 CR-12 Attenuation: 0.5 dB Steps to 15.5 dB2 Temperature Stability: ± 0.18 dB from –55°C to +85°C Typical Low DC Power Consumption Hermetic Surface Mount Package Integral TTL Driver 50 O Nominal Impedance Description M/A-COM’s AT-283 is a GaAs FET 5-bit digital attenuator with a 0.5 dB minimum step size and 15.5 dB total attenuation. This attenuator and integral TTL driver is in a hermetically sealed ceramic 16-lead surface mount package. The AT-283 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: TA = 25°C Parameter Test Conditions Units Min Typical Max Reference Insertion Loss DC-0.5 GHz DC-1.0 GHz DC-2.0 GHz dB dB dB — — — — — — 2.2 2.5 2.9 Attenuation Accuracy 3 ± (0.25 +3% of attenuation setting in dB) dB ± (0.25 +3% of attenuation setting in dB) dB or ± 0.4 dB, whichever is greater DC-1.0 GHz DC-2.0 GHz — — — — — — 1.6:1 1.7:1 Trise, Tfall Ton, Toff Transients 10% to 90% 50% Control to 90/10% RF In-band (peak—peak) nS nS mV — — — 10 27 22 — — — dBm dBm — — +20 +28 — — dBm dBm — — +40 +47 — — Input IP3 4 2. 3. 4. DC-2.0 GHz DC-2.0 GHz VSWR 1 dB Compression 4 1. Any Single Bit Any Combination of Bits Input Power Input Power 0.05 GHz 0.5-2.0 GHz For two-tone input power up to +5 dBm 0.05 GHz 0.5-2.0 GHz All specifications apply when operated with bias voltages of +5.0V for VCC and –5.0V to -8.0V for VEE, and 50 O impedance at all ports unless otherwise specified. Above reference insertion loss. This attenuator is guaranteed monotonic. VEE = -5.0V for the typical numbers given. Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz AT-283 V 5.00 Electrical Specifications1: TA = 25°C Parameter Input IP2 Test Conditions 4 For two-tone input power up to +5 dBm 0.05 GHz 0.5-2.0 GHz Units Min Typical Max dBm dBm — — +53 +68 — — VCC VEE — — V V 4.5 -8.0 5.0 — 5.5 -5.0 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 Vctl 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 Truth Table Recommended PCB Layout Control Inputs C4 C5 0 0 C1 0 C2 0 C3 0 Attenuation Reference 1 0 0 0 0 0.5 dB 0 1 0 0 0 1 dB 0 0 1 0 0 2 dB 0 0 0 1 0 4 dB 0 0 0 0 1 8 dB 1 1 1 1 1 15.5 dB 0 = TTL Low; 1 = TTL High Functional Schematic (Top View) Absolute Maximum Ratings Parameter Absolute Maximum Maximum Input Power 0.05 GHz 0.5-2.0 GHz +27 dBm +34 dBm Supply Voltages VCC VEE +5.5V -8.5V Control Voltage -0.5V to VCC + 0.5V Operating Temperature -55°C to +125°C Storage Temperature -65°C to +150°C Note: Operation of this device above any on of these parameters may cause permanent damage. 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, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz AT-283 V 5.00 Typical Performance Curves Attenuation Accuracy vs. Frequency 0.5, 1, 2 dB Bits Reference Insertion Loss vs. +85°C +25°C -55°C Deviation from Nom. Atten. (dB) Insertion Loss (dB) 5.0 4.0 3.0 2.0 1.0 0.0 0 500 1000 1500 2000 0.5 0.3 0.0 -0.3 -0.5 0 500 Frequency (MHz) 1000 1500 2000 Frequency (MHz) VSWR vs. Frequency Reference Loss, 0.5, 1, 2 dB Bits Attenuation Accuracy vs. Frequency 4, 8 dB Bits and Full Attenuation 2.0 1.8 0.5 VSWR Deviation from Nom. Atten. (dB) Full Atten. 1.0 1.6 1.4 0.0 1.2 1.0 -0.5 0 500 1000 1500 2000 0 500 1500 2000 Frequency (MHz) Frequency (MHz) VSWR vs. Frequency 4, 8 dB Bits and Full Attenuation Ordering Information 5 2.0 1.8 VSWR 1000 Part Number Package AT-283 PIN CR-12 1.6 5. Contact the factory for standard or custom screening requirements. 1.4 1.2 1.0 0 500 1000 1500 2000 Frequency (MHz) 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