ARA1400S12 Datasheet, PDF (3/8 Pages) ANADIGICS, Inc – CATV Reverse Amplifier with step Attenuator

ARA1400S12
CATV REVERSE AMPLIFIER WITH STEP ATTENUATOR
Advanced Product Information Rev. 2
Tx Enable/Disable
Gain Control
Coax
Connector
Diplex
Filter
PA
ATTN
4/8/16/32 dB
PA
ARA1400 Reverse Amp
54-860 MHz
Double
Conversion
Tuner
Upstream
LPF
Balun
QPSK/
16-QAM
Modulator
45 MHz IF
SAW
Clock
Data
MAC
Microcontroller
w/Enet MAC
Clock
Data
RAM
ROM
QAM
Receiver
w/FEC
10Base-T
Tranceiver
RJ45
Connector
Figure 1: Cable Modem or Interactive Set-Top Box Block Diagram
RF_{OUT1 ATTIN}
ATT_OUT
RF_IN2
RF_IN
AMP
56 dB 4 dB step digital attenuator section
AMP
RF_OUT
ISET1
32 dB
16 dB
8 dB
4 dB
Figure 2
ISET2
Tx
A
3