A
S12
28 PIN SSOP PACKAGE
FEATURES
APPLICATIONS
ARA1400S12
CATV Reverse Amplifier with Step Attenuator
Advanced Product Information
Rev. 2
• Low cost integrated monolithic GaAs
amplifier and step attenuator with output
disconnect switch.
• Meets DOCSIS distortion requirements at
+60 dBmV
• Frequency range: 5 100 MHz
• Attenuation Range: 0 56 dB, variable in
4 dB steps
• 5 Volt operation
• Low distortion & Low noise figure
• MCNS/DOCSIS Compliant Cable Modems
• CATV Interactive Set-Top Box
• Telephony over Cable Systems
DESCRIPTION
The ARA1400S12 is a GaAs IC designed to perform 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. It is capable of meeting the MCNS/DOCSIS harmonic distortion specifications while only requiring
a single polarity +5V supply. This
part is a single ended design
that does not require an output
balun to achieve 52 dBc 2
nd
harmonic performance at +60
dBmV output levels. Both the
input and output are matched to
75 ohms. The precision
attenuator provides up to 56 dB
of attenuation in 4 dB
increments. The ARA1400S12
is supplied in a 28-pin SSOP
package featuring a thermal heat
slug on the bottom of 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.
V
DD
)71,21,4SNIP(9CDV
V
NIFR
)62,01SNIP(3-ot0CDV
TTA
NI
TTA)3(
TUO
V)82(5DV
V
TESI
)72,11SNIP(2DV
*)62,01SNIP(egatloVtupnIFR 06+VmBd
erutarepmeTegarotS002+ot55-C
erutarepmeTgniredlo 62C
emiTgniredloS5ceS
erutarepmeTesaCgnitarepO58+ot0C
ABSOLUTE MAXIMUM RATINGS
PARAMETER PARAMETER
1
28