Texas Instruments TRF1500 - Manual (Page 11)

SWRA004A
12 TRF1500 Integrated Dual-Band RF Receiver User’s Guide
Introduction
The TRF1500 is a dual-band/dual-mode Personal
Communications System (PCS) receiver for cellular telephones
operating dual mode (analog and digital) in the 800 MHz band and
single mode (digital) in the 1900 MHz band. The TRF1500
consists of a low noise amplifier (LNA) and mixer for each band.
For image rejection, the low-band receiver relies on an off-chip
image rejection filter between the LNA and mixer while the high-
band receiver uses an image rejection mixer. The device operates
from a single 3.75 volt supply and is controlled by six digital
CMOS control lines. The digital control offers a wide range of
control states, including a sleep mode where the device typically
draws less than 5
µ
A.
Additionally, the local oscillator (LO) inputs have buffered outputs
that can be used in either single-ended or differential mode for a
phase-locked-loop (PLL) configuration. A state is also available
that allows the low-band LO to serve as the high-band LO through
a mode-selectable frequency doubler.
A wide-band mixer is also available for transmit loop architectures
which are commonly used in advanced mobile phone systems,
global systems for mobile communications and other digital
systems.
The TRF1500 is available in a 48-pin plastic thin quad flatpack
package and is characterized for operation from -40C to 85C
operating free-air temperature.
Please refer to the data sheet for the TRF1500 (TI literature
number SLWS041A) for detailed information on the device
specifications and refer to the users guide for test instructions (TI
literature number SWRA004A).