uaa2077cm NXP Semiconductors, uaa2077cm Datasheet - Page 2

• Manufacturer Part Number: uaa2077cm
• Description: 2 Ghz Image Rejecting Front-end
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
APPLICATIONS
GENERAL DESCRIPTION
UAA2077CM contains both a receiver front-end and a high
frequency transmit mixer intended to be used in 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 UAA2077CM is its ability to
provide over 30 dB of image rejection. Consequently, the
image filter between the LNA and the mixer is suppressed.
QUICK REFERENCE DATA
1997 Sep 24
V
I
I
I
T
CC(RX)
CC(TX)
CC(PD)
amb
Low-noise, wide dynamic range amplifier
Very low noise figure
Dual balanced mixer for over 30 dB on-chip image
rejection
IF I/Q combiner at 188 MHz
On-chip quadrature network
Down-conversion mixer for closed-loop transmitters
Independent TX/RX fast ON/OFF power-down modes
Very small outline packaging
Very small application (no image filter).
High frequency front-end for DCS1800/PCS1900
hand-portable equipment
Compact digital mobile communication equipment
TDMA receivers e.g. RF-LANS.
CC
2 GHz image rejecting front-end
SYMBOL
supply voltage
receive supply current
transmit supply current
supply current in power-down
operating ambient temperature
PARAMETER
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.
Signals presented at the RF input at LO + IF frequency are
rejected through this signal processing while signals at
LO
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 all-pass filters outputs are buffered before
being fed to the receive mixers.
The transmit section consists of a low-noise amplifier, and
a down-conversion mixer. In the transmit mode, an internal
LO buffer is used to drive the transmit IF down-conversion
mixer.
All RF and IF inputs or outputs are balanced.
Pins RXON, TXON and SXON allow to control the different
power-down modes. A synthesizer-on (SX) mode enables
LO buffers independent of the other circuits. When
pin SXON is HIGH, all internal buffers on the LO path of
the circuit are turned on, thus minimizing LO pulling when
remainder of the receive or transmit chain is powered up.
Special care has been taken for fast power-up switching.
IF frequency can form the IF signal.
3.6
27.5
11
30
MIN.
3.75
36
14
+25
TYP.
5.3
44.5
17.5
50
+75
Product specification
UAA2077CM
MAX.
V
mA
mA
C
A
UNIT