uaa2077cm NXP Semiconductors, uaa2077cm Datasheet - Page 6

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

Philips Semiconductors
Local oscillator section
The Local Oscillator (LO) input directly drives the two
internal all-pass networks to provide quadrature LO to the
receive mixers.
A synthesizer-ON mode (SX mode) is used to power-up all
LO input buffers, thus minimizing the pulling effect on the
external VCO when entering receive or transmit mode.
This mode is active when SXON = 1.
Transmit mixer
This mixer is used for down-conversion to the transmit IF.
Its inputs are coupled to the transmit RF which is
Table 1 Control of power status
1997 Sep 24
handbook, halfpage
2 GHz image rejecting front-end
TXON
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOGND
V CCLO
EXTERNAL PIN LEVEL
Fig.4 Block diagram, LO section.
SXON
RXON
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOINA
QUAD
to RX
LOINB
SXON
HIGH
HIGH
HIGH
LOW
LOW
LOW
X
MGD287
power-down mode
RX mode: receive section and LO buffers to RX on
TX mode: transmit section and LO buffers to TX on
SX mode: complete LO section on
SRX mode: receive section on and SX mode active
STX mode: transmit section on and SX mode active
receive section and transmit section on; specification not guaranteed
to TX
6
down-converted to a modulated transmit IF frequency,
phase locked with the baseband modulation.
The IF outputs are HIGH impedance (open-collector
type).Typical application will load the output with a 560
resistor load, connected to V
output, plus a differential 1 k made of the input
impedance of the matching network for the following TX
part. The mixer can also be used for frequency
up-conversion.
Fast switching, ON/OFF, of the transmit section is
controlled by the hardware input TXON.
handbook, halfpage
CIRCUIT MODE OF OPERATION
LOIN
Fig.5 Block diagram, transmit mixer.
TXON
TXINB
TX MIXER
CC
TXINA
for DC path, at each TX
UAA2077CM
Product specification
MGD153
TXOA
TXOB