uaa2077am NXP Semiconductors, uaa2077am Datasheet - Page 2

• Manufacturer Part Number: uaa2077am
• Description: Image Rejecting Front-end For Dect Applications
• Manufacturer: NXP Semiconductors

QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors
FEATURES
APPLICATIONS
GENERAL DESCRIPTION
UAA2077AM contains a high frequency low noise receiver
front-end intended to be used in DECT mobile telephones.
Designed in an advanced BiCMOS process it combines
high performance with low power consumption and a high
degree of integration, thus reducing external component
costs and total front-end size.
The main advantage of the UAA2077AM is its ability to
provide over 25 dB of image rejection. Consequently, the
image filter between the LNA and the mixer is suppressed.
1996 Jul 04
V
I
I
T
CC(RX)
CC(PD)
Low-noise, wide dynamic range amplifier
Very low noise figure
Dual balanced mixer for over 25 dB on-chip image
rejection
IF I/Q combiner at 110 MHz
On-chip quadrature network
RX fast on/off power-down mode
Shrink small outline packaging
Very small application (no image filter).
1800 MHz front-end for DECT hand-portable
equipment
Compact digital mobile communication equipment
TDMA receivers.
amb
CC
Image rejecting front-end
for DECT applications
SYMBOL
TYPE NUMBER
UAA2077AM
supply voltage
receive supply current
supply current in power-down
operating ambient temperature
SSOP20
PARAMETER
NAME
plastic shrink small outline package; 20 leads; body width 4.4 mm
T
over full temperature range
amb
= 0 to +70 C
CONDITIONS
2
Image rejection is achieved in the internal architecture by
two RF mixers in quadrature and two all-pass filters in I
and Q IF channels that phase shift the IF by 45 and 135
respectively. The two phase shifted IFs are recombined
and buffered to furnish the IF output signal.
For instance, signals presented at the RF input at LO + IF
frequency are rejected through this signal processing
while signals at LO
An internal switch enables the upper or lower image
frequency to be rejected.
The receiver section consists of a low-noise amplifier that
drives a quadrature mixer pair. The IF amplifier has
on-chip 45 and 135 phase shifting and a combining
network for image rejection. The IF driver has differential
open-collector type outputs.
The LO part consists of an internal all-pass type phase
shifter to provide quadrature LO signals to the receive
mixers.The centre frequency of the phase shifter is
adjustable for maximum image rejection in a given band.
The all-pass filters outputs are buffered before being fed to
the receive mixers. All RF and IF inputs or outputs are
balanced.
Two pins RXON and SXON are used to control the
different power-down modes. A special mode of operation
called synthesizer-on mode (SX mode), controlled by pin
SXON can be used to minimize the LO pulling when the
receiver is turned on. When SXON is HIGH, all internal
buffers on the LO path are turned on. Pin SBS allows a
selection of whether to reject the upper or lower image
frequency. Special care has been taken for fast power-up
switching.
DESCRIPTION
PACKAGE
3.15
3.6
21.5
30
MIN.
IF frequency can form the IF signal.
4.0
4.0
26.5
0.2
+25
TYP.
Product specification
UAA2077AM
5.3
5.3
33.5
50
+85
MAX.
SOT266-1
VERSION
V
V
mA
C
UNIT
A