APS3608
Active Splitter for CATV Set-Top Boxes
PRELIMINARY DATA SHEET - Rev 1.0
FEATURES
•
•
•
•
•
•
•
•
Single Input, Triple Output Design
- Three Video Tuner Outputs
Wideband Operation: To Above 1 GHz
5 dB Typical Noise Figure at 5 dB Gain
Extended Dynamic Range AGC Control,
Independent for each Tuner Path
High Linearity, Low Distortion
Single +5 V Supply
Balanced 75 Ohm Inputs/Outputs
RoHS Compliant/Lead Free
APPLICATIONS
•
CATV Set-Top Boxes with Multiple Tuners
S29 Package
28 Pin QFN
5 mm x 5 mm x 1 mm
PRODUCT DESCRIPTION
This active splitter from ANADIGICS accepts a
balanced RF input in the 50 MHz to 1.1 GHz frequency
range and provides three balanced RF outputs with
minimal degradation in signal quality. The single-
package surface mount device amplifies the input
signals using highly linear, low noise amplification
stages, and couples the amplified signal to three
separate output paths to drive video tuner inputs.
Each of the output paths includes independent
Automatic Gain Control (AGC). The overall linearity
of each tuner path is maintained across a wide AGC
range, ensuring low distortion effects on each output
signal.
Requiring only a single +5 Volt supply, the active
splitter design is implemented using the
ANADIGICS GaAs MESFET process. The surface
mount packaging makes the device ideal for use in
today’s multiple-tuner set-top boxes for Cable TV.
AGC
VID1
AGC
VID2
AGC
VID3
VID1
OUT+
VID1
OUT-
RF
IN+
RF
IN-
VID2
OUT+
VID2
OUT-
VID3
OUT+
VID3
OUT-
Figure 1: Functional Block Diagram
02/2007
APS3608
GND
GND
GND
GND
GND
GND
23
28
27
26
25
24
V
CC
GND
RF
IN+
GND
RF
IN-
GND
AGC
VID1
GND
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VID1
OUT+
GND
VID1
OUT-
GND
VID2
OUT+
GND
VID2
OUT-
VID3
OUT+
GND
AGC
VID2
Figure 2: Pinout (X-ray Top View)
Table 1: Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
NAME
V
CC
GND
RF
IN+
GND
RF
IN-
GND
AGC
VID1
AGC
VID2
AGC
VID3
GND
VID3
OUT+
GND
VID3
OUT-
GND
DESCRIPTION
Supply Voltage
Ground
RF Input (+)
Ground
RF Input (-)
Ground
Video 1 AGC Control Input
Video 2 AGC Control Input
Video 3 AGC Control Input
Ground
Data Path Output (+)
Ground
Data Path Output (-)
Ground
PIN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VID3
OUT-
AGC
VID3
GND
GND
NAME
GND
GND
GND
GND
GND
GND
GND
VID1
OUT+
GND
VID1
OUT-
GND
VID2
OUT+
GND
VID2
OUT-
DESCRIPTION
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Video 1 Output (+)
Ground
Video 1 Output (-)
Ground
Video 2 Output (+)
Ground
Video 2 Output (-)
PRELIMINARY DATA SHEET - Rev 1.0
02/2007
APS3608
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Minimum and Maximum Ratings
PARAMETER
Supply Voltage (V
CC
)
AGC Input Voltage (V
AGC
)
RF Input Power (P
IN
)
MIN
0
0
-
MAX
+8
+5
+25
UNIT
V
V
dBmV
differential into 75
Ω
COMMENTS
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.
Table 3: Operating Ranges
PARAMETER
Operating Frequency (f)
Supply Voltage (V
CC
)
AGC Input Voltage (V
AGC
)
RF Input Power (P
IN
)
Case Temperature (T
C
)
MIN
50
-
+0.3
-15
-20
TYP
-
+5
-
-
-
MAX
1100
-
+3.0
+15
+85
UNIT
MHz
V
V
COMMENTS
max. gain at +3 V
dBmV differential into 75
Ω
°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
02/2007
3
APS3608
Table 4: DC Electrical Specifications
(T
C
= +25 °C, V
CC
= +5 V, 75
Ω
system)
PARAMETER
Current Consumption
AGC Input Leakage Current
MIN
-
-
TYP
175
50
MAX
-
-
UNIT
mA
µA
COMMENTS
from +5 V supply
each AGC input
Table 5: Video Tuner Path AC Electrical Specifications
(T
C
= +25 °C, V
CC
= +5 V, 75
Ω
system)
PARAMETER
Gain at Maximum AGC
Gain at Minimum AGC
AGC Range
Noise Figure
CTB
(1)
MIN
4.5
-
28.0
-
-
-
TYP
5.5
-24
29.5
4.8
-70
-70
-67
30
30
-8
75
MAX
-
-
-
6
-66
-66
-
-
-
-
-
UNIT
dB
dB
dB
dB
dB c
dB c
dB c
dB
dB
dB
Ω
COMMENTS
at 1 GHz
at 1 GHz
at 1 GHz
at maximum gain
CSO
(1)
XMOD
(1)
-
-
-
-
-
Isolation Between Output and Any
Other Output Port
Isolation Between Input and Output
Input Return Loss
Output Impedance
75
Ω
differential input
differential
Notes:
(1) 132 channels, +6 dBmV flat output, up to +15 dBmV flat input
4
PRELIMINARY DATA SHEET - Rev 1.0
02/2007
APS3608
PERFORMANCE DATA
Figure 3: Gain vs. Frequency
(T
C
= +25 °C, V
CC
= +5 V)
10
Vagc:
0V
0.8 V
+1.0 V
+1.2 V
+1.4 V
+1.6 V
+1.8 V
+2.0 V
+2.2 V
+3.0V
Figure 4: Input Return Loss vs. Frequency
(T
C
= +25 °C, V
CC
= +5 V)
0
Vagc:
-5
0V
1.4 V
1.8 V
+2.0 V
+2.2 V
+2.4 V
+3.0 V
5
S11: Input Rteurn Loss (dB)
0
100
200
300
400
500
600
700
800
900
1000
1100
0
S21: Gain (dB)
-5
-10
-15
-20
-25
-30
-10
-15
-20
-25
-30
0
100
200
300
400
500
600
700
800
900
1000
1100
Frequency (MHz)
Frequency (MHz)
Figure 5: Output Return Loss vs. Frequency
(T
C
= +25 °C, V
CC
= +5 V)
0
Vagc:
-5
0V
+0.8 V
+1.0 V
+1.4 V
+2.0 V
+2.2 V
+2.6 V
+3.0 V
-15
-20
-10
Figure 6: Reverse Isolation vs. Frequency
(T
C
= +25 °C, V
CC
= +5 V)
Vagc:
0V
+0.8 V
+1.0 V
+1.2 V
+3.0 V
S22: Output Return Loss (dB)
-10
-15
-20
-25
-30
-35
S12: Reverse Isolation (dB)
0
100
200
300
400
500
600
700
800
900
1000
1100
-25
-30
-35
-40
-45
-50
-55
-40
-60
0
300
600
900
1200
1500
1800
2100
2400
2700
3000
Frequency (MHz)
Frequency (MHz)
Figure 7: Noise Figure vs. Frequency
(T
C
= +25 °C, V
CC
= +5 V, V
AGC
= +3 V)
10
9
8
7
6
5
4
3
2
1
0
0
100
200
300
400
500
600
700
800
900
1000
1100
Noise Figure (dB)
Frequency (MHz)
PRELIMINARY DATA SHEET - Rev 1.0
02/2007
5
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