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PDF TAT8857 Data sheet ( Hoja de datos )
| Número de pieza | TAT8857 | |
| Descripción | CATV Doubler - Hybrid RFIC | |
| Fabricantes | TriQuint Semiconductor | |
| Logotipo |  |
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TAT8857
CATV Doubler – Hybrid RFIC
Applications
CATV Line Amplifiers
CATV System Amplifiers
Distribution Nodes
Green Applications
Product Features
75 Ω, 40 – 1000 MHz Bandwidth
GaAs pHEMT & MESFET Technology
21 – 27 dB configurable gain
Integrated linearization
Flexible bias voltage and current for optimum
efficiency
SOIC-16 Wide Package
General Description
The TAT8857 is a cost effective 75 Ω RFIC Amplifier
designed for use in Doubler 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 TAT8857 may be easily adjusted by varying
external components, allowing for a family of Doubler
solutions to be developed from a single RFIC.
The TAT8857 provides integrated linearization to improve
the 3rd order distortion performance.
The TAT8857 may be protected against transient surges
with the TQP200002 and an output high pass filter
network. Consult TriQuint for discussion.
The TAT8857 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.
SOIC-16 Wide Package
Functional Block Diagram
Pin Configuration
Pin #
1
2
3www.DataSheet.net/
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
Data Sheet: Rev B 05-28-12
© 2012 TriQuint Semiconductor, Inc.
Ordering Information
Part No. Description
TAT8857
RFIC
TAT8857-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  
TAT8857
CATV Doubler – Hybrid RFIC
Detailed Device Description
The TAT8857 is similar to other parts offered on the market; it contains two separate amplifiers. A major difference is the
TAT8857 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
R7 180 L9 82nH C9 82pF
+24v
GND
R3 C7 .01uF
390
R1 27k
R9 100 C11 0.01u
L5
15nH
Bias current is determined by 2 settings:
MABACT0051
1. Size of DC feedback resistors - decreasing
3
R1 & R2 will increase IDD
2. Tail resistors - decreasing R21 will
42
11
2
3
increase IDD, but lead to wider variationsRF T1
Active biasing schemes are possible but not
IN
necessary for most applications.
Best performance is with IDD = 350mA
C3
.01uF
C4
.01uF
www.DataSheet.net/
C5
1.8pF
C6
1.8pF
L6
15nH
C27 0.7pF
1
R5 8.09k2
R21 5.1
5.1
3
L7 600
4
12
5
12
L8 600 6
R6 8.09k 7
8
C28 0.7pF
LIN ADJ A
BIAS 2A
16
UPPER A
15
14
LOWER A
BIAS 1A
U1
GATE A
TAT888587D 57F3
BIAS 1B
GATE B
13
12
LOWER B
11
LIN ADJ B
10
UPPER B
BIAS 2B
9
R2 27k
R4
390 C8 .01uF
R10 100 C12 0.01u
C13 0.01uF
C15
L11
470nH
R20
33
L13 R13
27nH
1.3k
R11 18
R12 18
L19 600
12
Vga
L14 R14
27nH
1.3k
L12
470nH
R21
33
C14 0.01uF
2.2pF
C16
R8 180 L10 82nH C10 82pF
Voltage Biasing: 24V and 12V
The TAT8857 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.
Data Sheet: Rev B 05-28-12
© 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 TAT8857.PDF ] | |
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