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| GaAs IC High Isolation Positive Control SPDT Switch DC-2.5 GHz AS148-24 Features s Positive Voltage Control s High Isolation (50 dB @ 0.9 GHz and 1.9 GHz) s Low DC Power Consumption s Base Station Synthesizer Switch 0.050 (1.27 mm) 0.016 (0.40 mm) 0.158 (4.01 mm) 0.150 (3.81 mm) PIN 1 INDICATOR PIN 1 SOIC-14 PIN 14 0.050 (1.27 mm) BSC 0.244 (6.20 mm) 0.228 (5.80 mm) 0.020 (0.51 mm) 0.013 (0.33 mm) 0.049 (1.24 mm) 0.016 (0.41 mm) Description GaAs FET IC SPDT switch packaged in an SOIC-14 plastic package for low cost commercial applications. Ideal building block for base station dual band applications where synthesizer isolation is critical. Use in conjunction with the AS123-12 SPST switch to meet GSM synthesizer isolation requirement. 0.068 (1.73 mm) MAX. 0.016 MAX. (0.41 mm) x 45 CHAMFER 8 MAX. 0.344 (8.75 mm) 0.337 (8.55 mm) 0.010 (0.25 mm) 0.0098 (0.25 mm) 0.004 (0.10 mm) 0.0075 (0.19 mm) 0.158 (4.00 mm) 0.150 (3.80 mm) Electrical Specifications at 25C (0, +5 V) Parameter1 Insertion Loss3 Frequency2 DC-1.0 GHz DC-2.0 GHz DC-2.5 GHz DC-1.0 GHz DC-2.0 GHz DC-2.5 GHz DC-2.0 GHz DC-2.5 GHz 44 45 32 Min. Typ. 0.6 0.8 1.2 50 50 42 1.3:1 1.5:1 1.5:1 1.8:1 Max. 0.9 1.1 1.4 Unit dB dB dB dB dB dB Isolation VSWR4 Operating Characteristics at 25C (0, +5 V) Parameter Switching Characteristics5 Condition Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru Two-tone Input Power +10 dBm 0.5-2.0 GHz VLow = 0 to 0.2 V @ 20 A Max. VHigh = +5 V @ 200 A Max. to +7 V @ 500 A Max. VS = VHigh 0.2 V Frequency Min. Typ. 60 100 50 +41 Max. Unit ns ns mV dBm Intermodulation Intercept Point (IP3) Control Voltages 1. All measurements made in a 50 system, unless otherwise specified. 2. DC = 300 kHz. 3. Insertion loss changes by 0.003 dB/C. 4. Insertion loss state. 5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth. Alpha Industries, Inc. [781] 935-5150 * Fax [617] 824-4579 * Email sales@alphaind.com * www.alphaind.com Specifications subject to change without notice. 3/99A 1 GaAs IC High Isolation Positive Control SPDT Switch DC-2.5 GHz AS148-24 Typical Performance Data (0, +5 V) 1.5 70 1.25 60 dB 1.0 dB DC .5 1.0 1.5 2.0 2.5 50 0.75 40 0.5 30 DC .5 1.0 1.5 2.0 2.5 Frequency (GHz) Frequency (GHz) Insertion Loss vs. Frequency 1.4 Isolation vs. Frequency Absolute Maximum Ratings Characteristic RF Input Power Value 1 W Max. > 500 MHz 0/+8 V Control +8 V -0.2 V, +8 V -40C to +85C -65C to +150C 25C/W 1.3 1.2 Supply Voltage Control Voltage 1.1 Operating Temperature Storage Temperature JC DC .5 1.0 1.5 2.0 2.5 1.0 Frequency (GHz) VSWR vs. Frequency Pin Out J2 J3 CBL CBL GND 14 13 Truth Table V1 VHigh 0 V2 0 VHigh J1-J2 Isolation Insertion Loss J1-J3 Insertion Loss Isolation V1 12 GND 11 V2 10 GND 9 8 VHigh = +5 to +7 V (VS = VHigh 0.2 V). 1 2 3 4 5 6 7 GND VS GND CBL J1 GND GND GND DC blocking capacitors (CBL) must be supplied externally. CBL = 100 pF for operation >500 MHz. 2 Alpha Industries, Inc. [781] 935-5150 * Fax [617] 824-4579 * Email sales@alphaind.com * www.alphaind.com Specifications subject to change without notice. 3/99A |
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