ACA2408
870 MHz, 34 dB Gain
CATV Push-Pull Line Amplifier
PRELIMINARY DATA SHEET - Rev 1.2
FEATURES
•
•
•
•
•
•
•
•
34 dB 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
RoHS Compliant Package Option
APPLICATIONS
•
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.
RF Input
1:1
1A
2A
1:1
1B
ACA2408
2B
RF Output
Figure 1: Hybrid Application Diagram
11/2006
ACA2408
1
2
3
4
5
6
7
8
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
2A
IN
GND
1A
IN
1B
IN
I
SET
2B
IN
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
1A
OUT
B i as 1A
2A
OUT
2B
OUT
B i as 1B
1B
OUT
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
2
PRELIMINARY DATA SHEET - Rev 1.2
11/2006
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
VD C
dBmV
°C
°C
S ec
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: V
DD
(pins 12, 13)
Voltage at I
SET
(pin 6)
RF Frequency
Case Temperature
MIN
-
-
40
-40
TYP
+24
+3
-
-
MAX
-
-
870
+110
UNIT
VD C
VD C
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 1.2
11/2006
3
ACA2408
Table 4: AC and DC Electrical Specifications
(T
A
= +25 °C, V
DD
= +24 VDC)
PARAMETER
Gain
(1)
@ 870 MHz
Cable Equivalent Slope
Gain Flatness
Noise Figure
CTB
(1)
110 Channels
CSO
(1)
110 Channels
XMOD
(1)
110 Channels
(1)
(1)
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
4.5
UNIT
dB
dB
dB
dB
dB c
dB c
dB c
COMMENTS
to 870 MHz
(1)
(2)
(2)
(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
Outut Return Loss
(75
Ω
System)
(1)
dB
Supply Current
Thermal Resistance
mA
o
C/W
Notes:
(1) Measured with baluns on the input and output of the device.
(2) Flat output, +44 dBmV per channel.
4
PRELIMINARY DATA SHEET - Rev 1.2
11/2006
ACA2408
PERFORMANCE DATA
Figure 3: Gain (S21) vs. Frequency
(T
A
= +25 °C, V
DD
= +24 V, 75
Ω
system)
36.0
35.5
35.0
Gain (dB)
34.5
34.0
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
(T
A
= +25 °C, V
DD
= +24 V, 75
Ω
system)
0
-5
-10
Return Loss (dB)
-15
-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 1.2
11/2006
5
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