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Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC-3.5 GHz
V 6.00
AT90-0283
Features
n n n n n n n
CSP-1
Attenuation: 0.5 dB Steps to 15.5 dB Low DC Power Consumption Small Footprint, JEDEC Package Integral TTL Driver 50 ohm Impedance Test Boards are Available Tape and Reel Packaging Available
Description
M/A-COM's AT90-0283 is a GaAs FET 5-bit digital attenuator with integral TTL driver. Step size is 0.5 dB providing a 15.5 dB total attenuation range. This device is in an FQFP-N plastic surface mount package. The AT900283 is ideally suited for use where accuracy, fast speed, very low power consumption and low costs are required.
Electrical Specifications TA = +25C
Parameter Insertion Loss Attenuation Accuracy Test Conditions -- Individual Bits 0.5-1-4-8 dB Individual Bit 2 dB Any Combination of Bits 1 to 15.5 dB Full Range 50% Cntl to 90%/10% RF 10% to 90% or 90% to 10% -- -- Two-tone inputs up to +5 dBm -- -- Sink Current is 20 A max. Source Current is 20 A max. Vcc min to max, Logic "0" or "1" -Vee min to max, Logic "0" or "1" Frequency DC - 3.5 GHz DC - 3.5 GHz DC - 3.5 GHz DC - 3.5 GHz DC - 3.5 GHz -- -- 50 MHz 0.5 - 3.5 GHz 50 MHz 0.5-3.5 GHz -- -- -- -- -- -- Units dB dB dB dB Ratio nS nS dBm dBm dB dB V V V V mA mA Min -- -- -- -- -- -- -- -- -- -- -- 4.75 -8.0 0.0 2.0 -- -- Typical 2.8 -- -- -- 1.6:1 75 20 +21 +29 +35 +48 5.0 -5.0 -- -- 0.2 -0.2 Max 3.2 (.3 +5% of atten setting) (.4 +10% of atten setting) (.5 +7% of atten setting) 1.8:1 150 50 -- -- -- -- 5.25 -4.75 0.8 5.0 6 -1
VSWR Switching Speed 1 dB Compression Input IP3 +Vcc -Vee Logic "0" Logic "1" Icc -Iee
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz
AT90-0283
V 6.00
Pin Configuration
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1. Function GND C8 C4 C2 C1 C0.5 GND NC NC NC1 GND RF1 GND NC NC NC Pin # 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Function NC NC NC NC NC NC NC NC NC GND RF2 GND NC1 -Vee NC +Vcc
Recommended PCB Layout 2
Pins 10 & 29 must be isolated
2. Application Note C2083 is available on line at www.macom.com
Truth Table
C8 0 0 0 0 0 1 1 C4 0 0 0 0 1 0 1 C2 0 0 0 1 0 0 1 C1 0 0 1 0 0 0 1 C0.5 0 1 0 0 0 0 1 Attenuation Loss, Reference 0.5 dB 1.0 dB 2.0 dB 4.0 dB 8.0 dB 15.5 dB
Absolute Maximum Ratings 3
Parameter Max. Input Power 0.05 GHz 0.5 - 3.5 GHz +Vcc -Vee Logic Voltages
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Absolute Maximum +27 dBm +34 dBm +5.5V -8.5V -0.5 to +Vcc + 0.5V -40C to +85C -65C to +125C
0 = TTL Low; 1 = TTL High
Operating Temperature Storage Temperature
3. Operation of this device above any one of these parameters may cause permanent damange. 4. Standard CMOS TTL interface, latch-up will occur if logic signal is applied prior to power supply.
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 - 3.5 GHz Typical Performance Curves
Insertion Loss
3.0
AT90-0283
V 6.00
VSWR @ Insertion Loss
Input 1.75 Output
VSWR Ratio
2.5
Loss (dB)
1.50
2.0
1.25
1.5
1.0 0 500 1000 1500 2000 2500 3000 3500
1.00 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
Frequency (MHz)
Attenuation Error, 0.5 dB Bit
1.0
Attenuation Error, 1 dB Bit
1.0
0.5
0.5
Error (dB)
Error (dB)
0.0
0.0
-0.5
-0.5
-1.0 0 500 1000 1500 2000 2500 3000 3500
-1.0 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
Frequency (MHz)
Attenuation Error, 2 dB Bit
1.0
Attenuation Error, 4 dB Bit
1.0
0.5
Error (dB)
0.0
Error (dB)
0.5
0.0
-0.5
-1.0 0 500 1000 1500 2000 2500 3000 3500
-0.5 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
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
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz Typical Performance Curves
Attenuation Error, 8 dB Bit
1.0
AT90-0283
V 6.00
Attenuation Error, Max. Attenuation
3.0
2.0
Error (dB)
0.5
Error (dB)
1.0
0.0
0.0
-0.5 0 500 1000 1500 2000 2500 3000 3500
-1.0 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
Frequency (MHz)
VSWR, 0.5 dB Bit
Input 1.6 Output
VSWR, 1 dB Bit
Input 1.6 Output
VSWR Ratio
VSWR Ratio
1.4
1.4
1.2
1.2
1.0 0 500 1000 1500 2000 2500 3000 3500
1.0 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
Frequency (MHz)
VSWR, 2 dB Bit
Input 1.8 Output
1.6
VSWR, 4 dB Bit
Input Output
VSWR Ratio
1.6
1.4
VSWR Ratio
0 500 1000 1500 2000 2500 3000 3500
1.4
1.2
1.2
1.0
1.0 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
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.
4
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 3.5 GHz Typical Performance Curves
AT90-0283
V 6.00
VSWR, 8 dB Bit
Input 1.6 Output
1.8
VSWR, Maximum Attenuation
Input Output
VSWR Ratio
1.4
VSWR Ratio
1.6
1.4
1.2
1.2
1.0 0 500 1000 1500 2000 2500 3000 3500
1.0 0 500 1000 1500 2000 2500 3000 3500
Frequency (MHz)
Frequency (MHz)
Ordering Information
Part Number AT90-0283 AT90-0283TR AT90-0283-TB Package Bulk Packaging Tape and Reel (1K Reel) Units Mounted on Test Board
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.
5

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