SA1921 Datasheet, PDF (2/36 Pages) NXP Semiconductors – Satellite and cellular dual-band RF front-end

Philips Semiconductors
Satellite and cellular dual-band RF front-end
Product specification
SA1921
DESCRIPTION
The SA1921 is an integrated dual-band RF front-end that operates
at both cellular (AMPS, DAMPS, and GSM) and satellite
(1515–1600 MHz) frequencies, and is designed in a 13 GHz f_T
BiCMOS process—QUBiC1. The low-band is a combined low-noise
amplifier (LNA) and mixer. The LNA has a 1.7 dB noise figure at 943
MHz with 18.3 dB of gain and an IIP3 of –5 dBm. The wide-dynamic
range mixer has a 11 dB noise figure at 943 MHz with 7.2 dB of gain
and an IIP3 of +5 dBm.
The high-band contains a receiver front-end, and a high frequency
transmit mixer intended for closed loop transmitters. One advantage
of the high-band architecture is an image-rejection mixer with over
30 dB of image rejection; thus, eliminating external filter cost while
saving board space. The system noise figure is 3.9 dB at 1550 MHz
with a power gain of 22.2 dB and an IIP3 of –11.5 dB.
PIN CONFIGURATION
FEATURES
• Low current consumption
• Outstanding low- and high-band noise figure
• Excellent gain stability versus temperature and supply
• Image reject high-band mixer with over 30 dB of rejection
• Increased low-band LNA gain compression during analog
transmission
• LO input and output buffers
• On chip logic for network selection and power down
• Very small outline package
APPLICATIONS
• 800 to 1000 MHz analog and digital receivers
• 1515 to 1600 MHz digital receivers
• Portable radios
• Digital mobile communications equipment
12 11 10 9 8 7 6 5 4 3 2 1
HI/LO 13
SYN ON 14
HIGH BAND IF A 15
HIGH BAND IF B 16
LOW BAND IF A 17
LOW BAND IF B 18
GND 19
HIGH BAND LO A 20
HIGH BAND LO B 21
LOW BAND LO A 22
LOW BAND LO A 23
Rx ON 24
48 N/C
47 GND
46 GND
45 LOW BAND LNA OUT
44 GND
43 LOW BAND LNA IN
42 HIGH BAND LNA IN
41 GND
40 V CC
39 GND
38 STRONG SIGNAL
37 N/C
25 26 27 28 29 30 31 32 33 34 35 36
ORDERING INFORMATION
TYPE NUMBER
NAME
SA1921
LQFP48
1999 Mar 02
Figure 1. Pin Configuration
SR01732
PACKAGE
DESCRIPTION
Plastic low profile quad flat package; 48 leads; body 7x7x1.4 mm
VERSION
SOT313-2
2
853–2121 20917