T0905 Datasheet, PDF (1/9 Pages) ATMEL Corporation – General- purpose VHF/UHF Power Amplifier (135 to 600 MHz)

Features
• 35 dBm Output Power in CW Mode
• High Power Added Efficiency (PAE)
• Single Supply Operation (No Negative Rail)
• Simple Analog Power Ramp Control
• Low Current Consumption in Power-down Mode (Typically ≤15 µA)
• Small SMD Package (PSSOP28 with Heat Slug)
Applications
• Professional Phones
• Hands-free Sets
• ISM Band Application
• Wireless Infrastructure Preamplifiers
Description
The T0905 is a monolithic integrated power amplifier IC manufactured with Atmel’s
Silicon-Germanium (SiGe) process. Due to its open architecture, the device can be
used either as a two or three-stage amplifier. Every stage can be matched individu-
ally, thus allowing applications in a wide frequency range. The T0905 can be used
from 135 MHz up to 600 MHz in both linear and non-linear (saturated) mode. The
power gain can be set dynamically by means of an analog control input optionally for
each single stage or for the entire power amplifier. Constant gain mode is also possi-
ble. The T0905 is suited for CW mode up to 35 dBm. These features, including wide
power ramp control, make the T0905 a very flexible power amplifier for many different
applications.
Apart from telephone applications, the T0905 can also be used for car identification
systems and several other wireless communication systems. The single supply volt-
age operation at +3.5 V and a negligible leakage current in power-down mode enable
a remarkable simplification of the application’s power management.
Figure 1. Block Diagram
VCTL1 GAIN1 VCTL2 GAIN2 VCTL3 GAIN3
13
16 14
17 15
18
11
BGOUT
Buf1
Buf2
12
VCTL
BG
10
VCC_CTL
7
RFIN1
Match
RF1
Match
RF2
19
Buf3
VBIAS3
9
VBIAS2
8
VB2_DC
20
VB3_DC
22-25
Match
RF3
RFOUT/VCC3
21
GND3
65
4 3 28
GND1 VCC1 GND2 VCC2
RFIN2
27
VB3
26
GND3
General-
purpose
VHF/UHF Power
Amplifier
(135 to 600 MHz)
T0905
Preliminary
Rev. 4751D–SIGE–05/04