Philips Semiconductors
Product specification
Satellite and cellular dual-band RF front-end
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.
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
PIN CONFIGURATION
MIX IN
V CC
Tx IF B
GND
GND
GND
GND
Tx B
N/C
Tx A
Tx IF A
2
N/C
1
12
HI/LO
SYN ON
HIGH BAND IF A
HIGH BAND IF B
LOW BAND IF A
LOW BAND IF B
GND
HIGH BAND LO A
HIGH BAND LO B
LOW BAND LO A
LOW BAND LO A
Rx ON
13
14
15
16
17
18
19
20
21
22
23
24
11
10
9
8
7
6
5
4
3
48
47
46
45
44
43
42
41
40
39
38
37
N/C
GND
GND
LOW BAND LNA OUT
GND
LOW BAND LNA IN
HIGH BAND LNA IN
GND
V CC
GND
STRONG SIGNAL
N/C
25
VCC
26
Tx ON
27
V CC
28
HIGH BAND IMAGE SET I
29
GND
30
HIGH BAND LO INPUT
31
LOW BAND LO INPUT
32
GND
33
HIGH BAND IMAGE SET Q
34
GND
35
GND
36
N/C
SR01732
Figure 1.
Pin Configuration
ORDERING INFORMATION
TYPE NUMBER
SA1921
NAME
LQFP48
PACKAGE
DESCRIPTION
Plastic low profile quad flat package; 48 leads; body 7x7x1.4 mm
VERSION
SOT313-2
1999 Mar 02
2
853–2121 20917
Philips Semiconductors
Product specification
Satellite and cellular dual-band RF front-end
SA1921
Table 1. POWER DOWN CONTROL
LO BUFFER
Control State
(Hi/Lo, Syn On, Rx On, Tx On, Strong Signal)
x000x
01000
01100
01101
01110
01010
11000
11100
11101
11010
Sleep
Low-Band LO Buffer on
Low-Band Receive Normal
Low-Band receive Strong Signal
Low-Band Transmit (Analog only)
N/A
High-Band LO Buffer On
High-Band Receive Normal
High-Band Receive Strong Signal
N/A
High
Band
Off
Off
Off
Off
Off
Off
On
On
On
On
Low
Band
Off
On
On
On
On
On
Off
Off
Off
Off
LNA
High
Band
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Low
Band
Off
Off
On
Off
On
High Bias
MIXER
High
Band
Off
Off
Off
Off
Off
Off
Off
On
On
Off
Low
Band
Off
Off
On
On
On
Off
Off
Off
Off
Off
T
X
MIXER
DRIVER
High
Band
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
Low
Band
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
NOTE:
1. “0” is low logic state; “1” is high logic state.
1999 Mar 02
5
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