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ARA2000S23 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ARA2000S23
기능 CATV Reverse Amplifier with step Attenuator
제조업체 ANADIGICS Inc
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ARA2000S23 데이터시트, 핀배열, 회로
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




ARA2000S23 pdf, 반도체, 판매, 대치품
ARA2000S23
ELECTRICAL CHARACTERISTICS (TYPICAL) (VDD=5 VDC, TC=25 °C) (Continued)
PARAMETER
MIN TYP MAX UNIT
COMMENTS
I DD1
I DD2 (Output Amp) (Pins 21 and 24)
I DD2
I DD Digital (Attenuator) (Pin 2)
Power Consumption
- 2.4 6 mA Tx disabled
- 77 120 mA Tx enabled
- 3.7 9 mA Tx disabled
- 9 15 mA
-
0.67 1.08
W Tx enabled
Power Consumption
- 75 150 mW Tx disabled
Attenuator Step Size
0.6 - 1.4 dB
Gain Flatness 1
- 1.5 - dB 5 - 65 MHz
Output Voltage Transient 1
Tx enable/disable
- - 100 mVp-p At 0 db Attenuator Setting
- 4 7 - At 24 db Attenuator Setting
Maximum Attenuation
58.6
Notes:
1. As measured in ANADIGICS test fixture
2. At +60 dBmV output level into 75 ohm load
60.3
ARA2000
Attenuation Level vs C ontrol Word
64
60
56
52
48
44
40
36
32
28
24
20
16
12
8
4
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56
Control W ord
4

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ARA2000S23 전자부품, 판매, 대치품
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
49
51
2nd 3rd
Harmonic Distortion vs Power Out
53 55 57 59 61 63
Pout (dBmV)
65
100
90
80
70
60
50
40
30
20
10
0
0
Transients vs Attenuation
Pout = 55 dBmV at 0dB attenuation.
ARA
10 20 30 40 50
Power Attenuation (dB)
DOCSIS 1.1 Spec.
AARRAA22000010
ARA2000S23
67
60
7

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부품번호상세설명 및 기능제조사
ARA2000S23

CATV Reverse Amplifier with step Attenuator

ANADIGICS  Inc
ANADIGICS Inc

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