AT-106 Digital Attenuator, 50 dB, 6-Bit, TTL Driver, DC - 2 GHz Features V 5.00 CR-13 n Attenuation: 1 dB steps to 50 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-106 is a GaAs FET 6-bit digital attenuator with a 1 dB minimum step size and 50 dB total attenuation. This attenuator and integral TTL driver is in a hermetically sealed ceramic 24-lead surface mount package. The AT106 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 — — — — — — 3.6 4.1 4.6 Attenuation Accuracy 2 Any Single Bit Any Combination of Bits (For attenuation to 26 dB) Any Combination of Bits (For attenuation 27 to 50 dB) DC - 2.0 GHz DC - 2.0 GHz dB dB ± (0.3 +4% of atten. setting) ± (0.4 +4% of atten. setting) DC - 1.5 GHz dB ± (0.5 +5% of atten. setting) VSWR — 0.05 - 0.10 GHz 0.101 - 2.0 GHz Ratio Ratio — — — — 2.0:1 1.8:1 Trise, Tfall 10% to 90% — ns — 9 — Ton, Toff 50% Control to 90/10% RF — ns — 45 — Transients In-Band (peak-peak) — mV — 40 — 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 — — +34 +46 — — Input IP2 For two-tone Input Power Up to +5 dBm 0.05 GHz 0.5 - 2.0 GHz dBm dBm — — +75 +79 — — 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, 50 dB, 6-Bit, TTL Driver, DC - 2 GHz AT-106 V 5.00 Electrical Specifications (From –55°C to +85°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 — — 6.0 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) 0 to 0.8V — µA — — 1.0 Input Leakage Current (High) 2.0 to 5.0V — µA — — 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 Truth Table Control Inputs C6 C5 C4 C3 C2 C1 Attenuation 0 0 0 0 0 0 Reference 0 0 0 0 0 1 1 dB 0 0 0 0 1 0 2 dB -0.5V to Vcc +0.5V 0 0 0 1 0 0 4 dB Operating Temperature -55°C to +125°C 0 0 1 0 0 0 8 dB Storage Temperature -65°C to +150°C 0 1 0 0 0 0 16 dB 1 0 0 0 0 0 32 dB 1 1 1 1 1 1 63 dB Control Voltage 4 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) RF1 PIN 24 PIN 1 GND GND 32 dB GND GND GND 16 dB C32 GND C16 GND 8 dB Vee (-5V to -8V) GND Vcc (+5V) GND 4 dB GND C8 C4 2 dB C2 C1 GND GND Orientation Mark 1 dB PIN 12 GND GND RF2 PIN 13 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, 50 dB, 6-Bit, TTL Driver, DC - 2 GHz AT-106 V 5.00 Typical Performance Curves Insertion Loss vs. Frequency +25°C -55°C 1 dB Deviation from Nominal Atten (dB) +85°C Attenuation Accuracy vs. Frequency Insertion Loss (dB) 5 4 3 2 1 0 0.0 0.5 1.0 1.5 2 dB 0.40 0.20 0.00 -0.20 -0.40 -0.60 0.0 2.0 0.5 1.5 2.0 RF1 VSWR vs. Frequency 40 dB 4 dB 50 dB 2.00 Ref Loss & 2 dB 1 dB 32 dB 8 & 16 dB 2 1.8 1.00 VSWR Deviation from Nominal Atten (dB) 1.0 Frequency (GHz) Attenuation Accuracy vs. Frequency 32 dB 8 dB 0.60 Frequency (GHz) 16 dB 4 dB 0.00 -1.00 1.6 1.4 1.2 1 -2.00 0.0 0.5 1.0 1.5 2.0 0.0 0.5 RF2 VSWR vs. Frequency 16 dB 2 Ref Loss & 4 dB 32 dB 1.5 2.0 Frequency (GHz) Frequency (GHz) 8 dB 1.0 2 dB Ordering Information 1 dB Part Number Package AT-106 PIN CR-13 VSWR 1.8 1.6 1.4 1.2 1 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