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PDF ARA2000S23 Data sheet ( Hoja de datos )
| Número de pieza | ARA2000S23 | |
| Descripción | CATV Reverse Amplifier with step Attenuator | |
| Fabricantes | ANADIGICS Inc | |
| Logotipo |  |
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ARA2000S23
CATV Reverse Amplifier with Step Attenuator
Advanced Product Information
Rev. 2
FEATURES
· Low cost integrated monolithic GaAs
amplifier with step attenuator.
· Attenuation Range: 0 58 dB, variable in
1 dB steps via 16 bit serial input.
· Meets DOCSIS distortion requirements at
+60 dBmV
· Low distortion & Low noise figure
· Frequency range: 5 100 MHz
· 5 Volt operation
· Programmable address allows multiple
parts to share 3 wire bus
APPLICATIONS
· MCNS/DOCSIS Compliant Cable Modems
· CATV Interactive Set-Top Box
· Telephony over Cable Systems
· Open Cable Set-Top Box
S23
28 PIN SSOP PACKAGE
Description
The ARA2000S23 is a GaAs IC designed to provide the reverse path amplification and output level control
functions in a CATV Set-Top Box or Cable Modem. It incorporates a digitally controlled precision step
attenuator that is preceded by an ultra low noise amplifier stage, and followed by an ultra-linear output driver
amplifier. This part is a balanced design that meets or exceeds the MCNS/DOCSIS requirement for
harmonic performance @ +60dBmV output levels while only requiring a single polarity +5V supply. Both the
input and output are matched to 75 ohms. The precision attenuator provides up to 58 dB of attenuation in 1
dB increments. The ARA2000S23 is supplied in a 28-pin SSOP package featuring a thermal heat slug on the
bottom of the package. Soldering this heat slug to the ground plane of the PC board ensures the lowest
possible thermal resistance for the device resulting in a long MTF.
Tx Enable/Disable
Gain Control
"Shutdown"
Low Pass
Filter
Balun
Diplexer
Filter
CMOS IC
PA
~
PA
ATTN
1/2/4/8/16/32 dB
PA
~
PA
ARA2000 Reverse Amp
54-860 MHz
Double
Conversion
Tuner
Low Pass
Filter
Upstream
QPSK/
16-QAM
Modulator
Clock
Data
"Shutdown"
MAC
45 MHz IF
SAW
Clock
Data
QAM
Receiver
w/FEC
Microcontroller
w/Enet MAC
10Base-T
Tranceiver
RAM
ROM
RJ45
Connector
Coax Input
Figure 1: Cable Modem or Interactive Set-Top Box Block Diagram
1 page  
Gain & Noise Figure vs Frequency
35 8
30 7
25 6
20 5
15 4
10 3
52
10 20 30 40 50 60 70 80 90 100
Frequency (MHz)
Gain
Noise Figure
Gain & Noise Figure vs VDD
35 6
32 5
29 4
26 3
23
20
3
35
Measured @ 30 MHz
456
VDD ( Volts )
Gain
Noise Figure
GAIN & Noise Figure vs Temperature
2
1
7
6
32 5
29 4
26 3
23
20
-40 -25 -10
2
5 20 35
Temperature (Co)
Gain
Noise Figure
Measured @ 30 MHz
50 65 80
1
ARA2000S23
5
5 Page 
ARA2000S23
PIN DESCRIPTION
Pin
Function
Description
1 Ground
2
VATTN
Supply for Attenuator
3
ATTIN (+)
Attenuator Input (+)
4
A1 OUT (+)
Amplifier 1 (+) Output
5
A1IN (+)
Amplifier 1 (+) Input
6 Vg1 Amplifier A1 (+/-) Control
7 ISET1 Amplifier A1 (+/-) Current Adjust
8
A1IN (-)
Amplifier A1 (-) Input
9
A1OUT (-)
Amplifier A1 (-) Output
10
ATTIN (-)
Attenuator Input (-)
11
CMOS
Supply For Digital CMOS Circuit
12
CLK
Clock
13
DAT
Data
14 En Enable
15 C0 Die Address (see page 6)
16 C1 Die Address (see page 6)
17 N/C No connection
18
CMOS
Ground for Digital CMOS Circuit
19
ATTOUT (-)
Attenuator Output (-)
20
A2IN (-)
Amplifier A2 (-) Input
21
A2OUT (-)
Amplifier A2 (-) Output
22 ISET2 Amplifier A2 (+/-) Current Adjust
23 Vg2 Amplifier A2 (+/-) Control
24
A2 OUT (+)
Amplifier A2 (+) Output
25
A2 IN (+)
Amplifier A2 (+) Input
26
ATTOUT (+)
Attenuator Output (+)
27 N/C No Connection
28
GND
Ground
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ARA2000S23.PDF ] | |
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