Document
ACA2408
870 MHz, 34 dB Gain CATV Push-Pull Line Amplifier
PRELIMINARY DATA SHEET - Rev 1.0
FEATURES
• • • • • • • 34dB Gain Very Low Distortion Stable with High VSWR Load Conditions Monolithic Design for Consistent Performance Part-to-Part Low DC Power Consumption Surface Mount Package Compatible with Automatic Assembly Low Cost Alternative to Hybrids
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• Line Extenders, Apartment House Amplifiers, System Amplifiers, Distribution Nodes
S7 Package 16 Pin Wide Body SOIC with Heat Slug PRODUCT DESCRIPTION
The ACA2408 is a highly linear, monolithic GaAs RF amplifier that has been developed to replace, in new designs, standard CATV hybrid amplifiers. Offered in a convenient surface mount package, the MMIC consists of two pairs of parallel amplifiers that are optimized for exceptionally low distortion and noise figure. A hybrid equivalent that provides flat gain response and excellent input and output return loss over the 40 to 870 MHz CATV downstream band is formed when one ACA2408 is cascaded between two appropriate transmission line baluns.
1A RF Input 1:1
2A 1:1
RF Output 1B 2B
ACA2408
Figure 1: Hybrid Application Diagram
07/2003
ACA2408
1 2 3 4 5 6 7 8
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GND 2A IN GND 1A IN 1B IN I SET 2B IN GND
Figure 2: Pin Out
GND 1A OUT Bias 1A 2A OUT 2B OUT Bias 1B 1B OUT GND
16 15 14 13 12 11 10 9
Table 1: Pin Description
PIN 1 2 3 4 5 6 7 8
NAME GND 2AIN GND 1AIN 1BIN ISET 2BIN GND
DESCRIPTION Ground Amplifier 2A Input Ground Amplifier 1A Input Amplifier 1B Input Current Adjust Amplifier 2B Input Ground
PIN 16 15 14 13 12 11 10 9
NAME GND 1AOUT Bias 1A 2AOUT 2BOUT Bias 1B 1BOUT GND
DESCRIPTION Ground Amplifier 1A Output Bias for 1A Amplifier Amplifier 2A Output and Supply Amplifier 2B Output and Supply Bias for 1B Amplifier Amplifier 1B Output Ground
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PRELIMINARY DATA SHEET - Rev 1.0 07/2003
ACA2408
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Mimimum and Maximum Ratings PARAMETER Supply (pins 12, 13) RF Power at Inputs (pins 4, 5) Storage Temperature Soldering Temperature Soldering Time MIN 0 -65 MAX +28 +55 +150 +260 5.0 UNIT VDC dBmV °C °C Sec
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Stresses in excess of the absolute ratings may cause permanent damage. Functional operation is not implied under these conditions. Exposure to absolute ratings for extended periods of time may adversely affect reliability. Notes: 1. Pins 2, 4, 5 and 7 should be AC-coupled. No external DC bias should be applied. 2. Pin 6 should be AC-grounded and/or pulled to ground through a resistor for current control. 3. Pins 11 and 14 are bias feeds for input amplifiers 1A and 1B. No external DC bias should be applied. 4. Pins 10 and 15 receive DC bias directly from pins 11 and 14.
Table 3: Operating Ranges PARAMETER Supply: VDD (pins 12, 13) Voltage at ISET (pin 6) RF Frequency Case Temperature MIN 40 -40 TYP +24 +3 MAX 870 +110 UNIT VDC VDC MHz °C
The device may be operated safely over these conditions; however, parametric performance is guaranteed only over the conditions defined in the electrical specifications.
PRELIMINARY DATA SHEET - Rev 1.0 07/2003
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ACA2408 Table 4: AC and DC Electrical Specifications (TA = +25 °C, VDD = +24 VDC)
PARAMETER Gain (1) @ 870 MHZ Cable Equivalent Slope (1) Gain Flatness (1) to 870 MHZ Noise Figure (1) CTB (1) 110 Channels (2) CSO (1) 110 Channels (2)
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MIN 33.5 -
TYP 34.8 0 ±0.2 2.0 -70 -68 -65 25 28 26 20 21 27 24 20 17 17 325
MAX 4.0 -58 -58 -55 -20 -15.5 -14 -20 -15.5 -14 340
UNIT dB dB dB dB dBc dBc dBc
COMMENTS
XMOD (1) 110 Channels (2)
Input Return Loss (75 Ω system)
(1)
dB
40 to 80 MHz 80 to 160 MHz 160 to 320 MHz 320 to 640 MHz 640 to 870 MHz 40 to 80 MHz 80 to 160 MHz 160 to 320 MHz 320 to 640 MHz 640 to 870 MHz
Output Return Loss (1) (75 Ω system) Supply Current
dB
mA
Thermal Resistance
-
-
4.5
°C/W
Notes: (1) Measured with baluns on the input and output of the device. (2) Flat output, +44 dBmV per channel.
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PRELIMINARY DATA SHEET - Rev 1.0 07/2003
ACA2408
PERFORMANCE DATA
Figure 3: Gain (S21) vs. Frequency (TA = +25 °C, VDD = +24 V, 75Ω system)
36.0
35.5
35.0
Gain (dB)
34.5
34.0
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33.5
33.0 0 100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
Figure 4: Input and Output Return Loss (S11 and S22) vs. Frequency (TA = +25 °C, VDD = +24 V, 75Ω system)
0 -5 -10 -15
Return Loss (dB)
-20 -25 -30 -35 -40 -45 -50 0 100 200 300 400 500 600 700 800 900 1000 S11 S22
Frequency (MHz)
PRELIMINARY DATA SHEET - Rev 1.0 07/2003
5
ACA2408
PERFORMANCE DATA
Figure 5: Isolation (S12) vs. Frequency (TA = +25 °C, VDD = +24 V, 75Ω system)
0 -5 -10 -15
Isolation (dB)
-20 -25 -30 -35 -40
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-45 -50 0 100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
Figure 6: Noise Figure vs. Frequency (TA = +25 °C, VDD = +24 V)
3.0
2.5
Noise Figure (dB)
2.0
1.5
1.0
0.5
0.0 0 100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
6
PRELIMINARY DATA SHEET - Rev 1.