ADA-4643
Silicon Bipolar Darlington Ampli er
Data Sheet
Attention: Observe precautions for
handling electrostatic sensitive devices.
ESD Machine Model (Class A)
ESD Human Body Mode (Class 1B)
Refer to Avago Application Note A004R:
Electrostatic Discharge, Damage and Control.
RFin
2Tx
GND
RFout
& Vd
GND
Description
Avago Technologies’ ADA-4643 is an economical, easy-to-
use, general purpose silicon bipolar RFIC gain block am-
pli ers housed in a 4-lead SC-70 (SOT-343) surface mount
plastic package which requires only half the board space
of a SOT-143 package.
The Darlington feedback structure provides inherent
broad bandwidth performance, resulting in useful ope-
rating frequency up to 2.5 GHz. This is an ideal device for
small-signal gain cascades or IF ampli cation.
ADA-4643 is fabricated using Avago’s HP25 silicon bipolar
process, which employs a double-di used single poly-
silicon process with self-aligned submicron emitter
geometry. The process is capable of simultaneous high f
T
and high NPN breakdown (25 GHz f
T
at 6 V BVCEO). The
process utilizes industry standard device oxide isolation
technologies and submicron aluminum multilayer inter-
connect to achieve superior performance, high uniformity,
and proven reliability.
Surface Mount Package
SOT-343
Pin Connections and Package Marking
Note:
Top View. Package marking provides orientation and identi cation.
“2T” = Device Code
“x” = Date code character identi es month of manufacture.
C
block
C
block
C
bypass
R
c
V
CC
= 5 V
V
d
= 3.5 V
RFC
RF
input
RF
output
2Tx
R
c
=
V
cc
– V
d
I
d
Features
Small Signal gain ampli er
Operating frequency DC – 2.5 GHz
Unconditionally stable
50 Ohms input & output
Flat, Broadband Frequency Response up to 1 GHz
Operating Current: 20 to 60 mA
Industry standard SOT-343 package
Lead-free option available
Speci cations
900 MHz, 3.5 V, 35 mA (typ.)
17 dB associated gain
13.4 dBm P
1dB
28.3 dBm OIP
3
4 dB noise gure
VSWR < 2.2 throughput operating frequency
Single supply, typical I
d
= 35 mA
Applications
Cellular/PCS/WLL base stations
Wireless data/WLAN
Fiber-optic systems
ISM
Typical Biasing Con guration