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PDF TAT8858 Data sheet ( Hoja de datos )
| Número de pieza | TAT8858 | |
| Descripción | CATV Infrastructure Push-Pull Amplifier | |
| Fabricantes | TriQuint Semiconductor | |
| Logotipo |  |
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TAT8858
CATV Infrastructure Push-Pull Amplifier
Applications
• CATV Line Amplifiers
• CATV System Amplifiers
• Distribution Nodes
• Green Applications
Product Features
SOIC-16 Wide Package
Functional Block Diagram
• 75 Ω, 50 – 1000 MHz Bandwidth
• GaAs pHEMT & MESFET Technology
• User configurable gain: 27 – 34 dB
• Integrated linearization
• Choice of output device to optimize cost/performance
• Flexible bias voltage and current for optimum
efficiency
• SOIC-16 Wide Package
General Description
The TAT8858 is a cost effective 75 Ω RFIC Amplifier
designed for use in high gain 24 V CATV applications up
to 1000 MHz. It works with readily available SMT baluns
and transformers to provide a highly flexible low cost
replacement for traditional hybrids.
Gain of the TAT8858 may be easily adjusted by varying
external components, allowing for a family of push-pull
hybrid solutions to be developed from a single RFIC.
The TAT8858 provides integrated linearization to improve
the 3rd order distortion performance.
The TAT8858 may be protected against transient surges
with the TQP200002 and an output high pass filter
network. Consult TriQuint for discussion.
The TAT8858 supports traditional 24 V and 12 V supply
voltages. Bias current may be adjusted to suit particular
requirements with standard or active biasing approaches.
Consult TriQuint for further discussion.
Pin Configuration
Pin #
1
2
www.DataSheet.net/
3
4
5
6
7
8
9
Symbol
OUT 1A
LIN ADJ A
IN 1A
BIAS 1A
BIAS 1B
IN 1B
LIN ADJ B
OUT 1B
BIAS 2B
Pin #
10
11
12
13
14
15
16
17
Symbol
IN 2B
OUT 2B
GATE B
GATE A
OUT 2A
IN 2A
BIAS 2A
GND
Ordering Information
Data Sheet: Rev D 03/15/12
© 2012 TriQuint Semiconductor, Inc.
Part No. Description
TAT8858
RFIC
TAT8858-EB evaluation board
Standard T/R size = 1000 pieces on a 7” reel.
- 1 of 8 -
Disclaimer: Subject to change without notice
Connecting the Digital World to the Global Network®
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
TAT8858
CATV Infrastructure Push-Pull Amplifier
Detailed Device Description
The TAT8858 is similar to other parts offered on the market; it contains two separate amplifiers. A major difference is the
TAT8858 allows much flexibility to set gain and bias to cover multiple applications without an additional stage. This makes it
ideal for green designs. It uses a cost effective high voltage MESFET technology (designed for CATV) and a pHEMT process
(developed for high-volume applications). On-chip linearization is also utilized.
Bias Current Adjustment
Bias current is determined by 2 settings:
1. Size of DC feedback resistors - decreasing
R1 & R2 will increase IDD
2. Tail resistors - decreasing R21 will
increase IDD, but lead to wider variations
Active biasing schemes are possible but not
necessary for most applications.
Best performance is with IDD = 270mA
Voltage Biasing: 24V and 12V
www.DataSheet.net/
R7 36
L9 12nH
C9 470pF
L5
18nH
R3
360
C5
1.5pF
R21 12
12
C6
1.5pF
R4
360
L6
18nH
C7 .01uF
R1 20k
C11 .01uF R9 200
1
R5 10k
2
L7 600
12
12
L8 600
3
4
5
6
LIN ADJ A
BIAS 2A
16
UPPER A
15
14
LOWER A
BIAS 1A
U1
GATE A
TAT8888557D8L1H
BIAS 1B
GATE B
13
12
LOWER B
11
7
R6 18k 8
LIN ADJ B
10
UPPER B
BIAS 2B
9
R2 20k
C8 .01uF
C12 .01uF R10 100
C13
L11
470nH
L13
R11
R12
L14
L12
470nH
C14
R8 36
L10 12nH
C10 470pF
The TAT8858 has two amplifiers which can be configured to split a 24 V supply (and share the same current) or both
amplifiers can be biased from a 12V supply and draw current independently.
In the 24V case the voltage split ratio is left to the customer and is set by Vgate. In 24v applications, no capacitance should be
put on Vgate; this prevents a turn-on over-voltage condition from damaging the output FET.
Data Sheet: Rev D 03/15/12
© 2012 TriQuint Semiconductor, Inc.
- 5 of 8 -
Disclaimer: Subject to change without notice
Connecting the Digital World to the Global Network®
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TAT8858.PDF ] | |
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