AAT2077B2 AAT2077B2 Preliminary Data Sheet 75Ω Digital Attenuator 2-Bit 21 dB DC~1200 MHz 1. Product Overview 1.1 General Description The AAT2077B2 is a GaAs MMIC two bit positive control digital attenuator. The device operates from DC to 1200 MHz with a control and supply voltage of +3 V or +5 V. The AAT2077B2 has LSB of 7 dB and a total attenuation of 21dB. The AAT2077B2 is composed of two cascade fixed attenuators. The states of attenuator are controlled by the logic level voltage. The attenuator bit values are 7 dB (LSB), 14 dB for a total attenuation of 21 dB. Attenuation accuracy is ±(0.5 dB + 10 % of attenuation setting) @ DC~1200 MHz. 1.2 Features 75 Ω Impedance Attenuation: 21 dB with 7 dB LSB Attenuation Accuracy: ± (0.5 dB + 10 % of Atten. setting) @DC~1200 MHz 1.3 Applications Telecommunication System CATV and FTTH AAT2077B2 Block Diagram (X-ray view) 1.4 Package Profile & RoHS Compliance UQFN-14L, 2.0x2.0 mm2, surface mount 1/9 ASB Inc. [email protected] RoHS-compliant June 2017 AAT2077B2 2. Summary on Product Performances 2.1 Electrical Specifications Supply voltage = +5 V, TA = +25 C, ZO = 75 Parameter Test Condition 50 MHz Reference 500 MHz Insertion Loss (IL) 1200 MHz Min - Typ 0.4 0.6 0.7 Max Unit - dB Attenuation Accuracy 1) DC – 1200 MHz ±(0.5 dB + 10% of attenuation setting) Return Loss Switching Characteristics: Rise/fall Time On/off Time DC – 1200 MHz 15 Input P1dB IIP3 2) IIP2 2) (10% to 90% RF) (50% Vctrl to RF) - 300 320 50 MHz 1200 MHz 50 MHz 1200 MHz 50 MHz 860 MHz - Supply Voltage (Vs) Control Voltage 16 +3 Vs-0.5 0 High Low Current 26 21 37 37 60 80 +5 Vs 600 dB ns - dBm - dBm dBm +0.5 V V uA 1) Attenuation accuracy are calculated at any bit or combination 2) IIP3 and IIP2 are measured with two tones at an input power of +0 dBm/tone separated by 6 MHz. 2.2 2/9 Truth Table State V1 V2 Insertion loss Low Low 7 dB High Low 14 dB Low High 21 dB High High ASB Inc. [email protected] June 2017 AAT2077B2 2.3 Pin Configuration Pin Description Simplified Outline 1, 2, 4, 6, 8, 10, 11 No connection 3 RF1, RF port 9 RF2, RF port 5, 7 RF GND 12 Vs, DC power supply voltage. V2, DC control voltage. Controls 14 dB attenuation state. V1, DC control voltage. Controls 7 dB attenuation state. 13 14 Note: Backside metal paddle is DC ground. 2.4 Absolute Maximum Ratings Parameters Max. Ratings Operation Case Temperature -40 to 85 C Storage Temperature -65 to 150 C Device Voltage +7 V +27 dBm @ 50 MHz +22 dBm @ 1200 MHz +15 dBm @ 2700 MHz Input RF Power 2.5 Moisture Sensitivity Level Level 3 at 260 °C reflow (Intentionally Blanked) 3/9 ASB Inc. [email protected] June 2017 AAT2077B2 3. Application: DC ~ 1200 MHz (Vs = +5 V, 75 Ω) 3.1 Application Circuit & Evaluation Board PCB Information Material FR4 Thickness (mm) 0.8 Size (mm) 25x50 EB No. EB-2x2-QFN14_ATT01 Bill of Material Symbol Value Size Description Manufacturer AAT2077B2 - - 2-Bit digital attenuator ASB C1, C4 1 F 0402 DC blocking capacitor Murata C2, C3 1 F 0402 Bypass capacitor Murata 0805 Decoupling capacitor Murata 10 F Note: Bypass capacitors (C2 and C3) should be close to the RF GND(pin 5 and pin 7). C5 4/9 ASB Inc. [email protected] June 2017 AAT2077B2 3.2 Plot of Performances Normalized attenuation all states Insertion loss Input return loss over all states 5/9 Output return loss over all states ASB Inc. [email protected] June 2017 AAT2077B2 IIP2 vs. Frequency over all states IIP3 vs. Frequency over all states Step error vs. frequency over all states 6/9 ASB Inc. [email protected] June 2017 AAT2077B2 4. Package Outline (UQFN-14L, 2.0x2.0x0.4 mm3) Symbols A A1 A2 A3 b D E D1 E1 e1 e2 L R θ Burr Dimensions (In mm) MIN NOM 0.35 0.00 0.223 0.127REF 0.15 0.20 1.95 2.00 1.95 2.00 1.00BSC 1.00BSC 0.40BSC 0.45BSC 0.13 0.18 0.125BSC -12 0.00 0.03 MAX 0.40 0.05 0.273 0.25 2.03 2.03 0.23 0 0.06 5. Surface Mount Recommendation (In mm) NOTE 1. Recommended is that the ground via holes be placed on the bottom of the exposed pad of the device for better RF and thermal performance, as shown in the drawing at the left side 7/9 ASB Inc. [email protected] June 2017 AAT2077B2 6. Tape and Reel Information 6.1 8/9 UQFN-14L Package ASB Inc. [email protected] June 2017 AAT2077B2 7. Recommended Soldering Reflow Profile 260 C 20~40 sec Ramp-up (3 C/sec) Ramp-down (6 C/sec) 200 C 150 C 60~180 sec (End of Datasheet) Copyright 2017 ASB Inc. All rights reserved. Datasheet subject to change without notice. ASB assumes no responsibility for any errors which may appear in this datasheet. No part of the datasheet may be copied or reproduced in any form or by any means without the prior written consent of ASB. 9/9 ASB Inc. [email protected] June 2017