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STB5600TR

P1-P3P4-P6P7-P9P10-P10
Obsolete Product(s) - Obsolete Product(s)
ELECTRICAL SPECIFICATION (V
VCCRF
= 3.3 V ...5.9 V; V
VCCIF
= 3.3 V ...5.9 V; V
VCC LOGIC
= 3.3 V
...5.9 V V
VCCDRIVE
= 3 V; T
a
=25
o
C unless otherwise specified)
LNA MIXER
Symbol Parameter Note Min. Typ. Max. Unit
I
VCCRF
Supply Current VVCCRF = 5 V 20 25 mA
Z
in
Differential Input
Impedance
@ 1575 MHz AC Coupled at RF+
RF- inputs
300
1
Ω
pF
Z
out
Differential Output
Impedance
@ 20 MHz AC Coupled at IF1+ IF1-
outputs
70
3
Ω
pF
G
C
Voltage Conversion
Gain
R
L
>3KΩ,P
IN
= -80 dBm
(V
in
=75µVp on 300 Ω)
35 dB
IIP1 Input Compression
Point (1dB)
(see application circuit) -60 dBm
NF Noise figure 5 dB
f
RF
Input Signal
Frequency (L1)
1575 MHz
f
IF
Output Signal
Frequency
20 MHz
LO INPUT BUFFER
Symbol Parameter Note Min. Typ. Max. Unit
Z
in
Differential Input
Impedance
@ 1555 MHz AC Coupled at LO+
LO- inputs
300
1
Ω
pF
Input Signal Level -60 -40 -20 dBm
LIMITING AMPLIFIER
Symbol Parameter Note Min. Typ. Max. Unit
I
VCCIF
Supply Current VVCCIF = 5 V 2.5 3.5 mA
Z
in
Differential Input
Impedance
@ 20 MHz AC Coupled at IF2+ IF2-
inputs
15 KΩ
B Bandwidth 3dB 5 80 MHz
Sens Limiter sensitivity Input Signal @ 20 MHz AC Coupled 100 µVp
V
INMAX
Maximum Input Signal Input Signal @ 20 MHz AC Coupled 0.5 Vp
CLOCK INPUT BUFFER
Symbol Parameter Note Min. Typ. Max. Unit
I
VCCLOGIC
Supply Current VVCC LOGIC = 5 V 5 7 mA
Z
in
Differential Input
Impedance
@ 80 MHz AC Coupled at 8O MHz+
80 MHz- inputs
8
2
KΩ
pF
Input Signal Level @ 80 MHz AC Coupled at 8O MHz+
80 MHz- inputs
5100mVp
N Division Ratio 5
STB5600
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ELECTRICAL CHARACTERISTICS (Continued)
OUTPUT SECTION
Symbol Parameter Note Min. Typ. Max. Unit
I
VCCDRIVE
Supply Current V
VCCDRIVE
=3V 8 mA
V
OH
High output voltage Vp = V
VCCDRIVE
=3V Vp-0.4 Vp V
V
OL
Low output voltage Vn = GNDDRIVE Vn Vn+0.4 V
t
r
Rise Time C
LOAD
=7pF 6 ns
t
f
Fall Time C
LOAD
=7pF 2 ns
APPLICATION CIRCUIT
A typical application circuit is shown in figure 1. The RF input from the antenna downlead is fed via a
ceramic filter and matching circuit to the RF+,RF- pins. The external LNA in the antenna should have
between 10 and 35dB of amplifier gain, so thenoise measured in a one MHz bandwidth should be
-114dBm for kTB in 1 MHz
+ 2dB LNA noise figure
+10/35 dB LNA gain (net)
Total -102/ 77dBm at connector.
Allowing 2dB for filter loss, -104/-79 is available at the matching circuit.
Fig. 1 Typical Application Circuit
STB5600
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A.1 Matching Network
The matching circuit may be a 50 Ohm / 300 Ohm balun transformer (figure 2), but a more economical
solution is a tuned match as shown below. A single 10nH inductor is optimal in cost, but may not meet
the users tolerance requirements over spreads of silicon and pcb material, as it has only around 1pF
tuning capacitance ( 2pF in series with 2pF inside the package).
The first example (figure 3) increases the capacitance with a discrete capacitor, and uses a lower
inductance value. Both examples assume that the ceramic filter is dc blocking, both input to output, and
output to ground.
The second (figure 4) example allows optimum matching by rationing the capacitors appropriately to
achieve voltage gain commensurate with the impedance translation. While it has a higher component
count, it is the versionmost tolerant of componentvariations and board capacitance.
Fig. 2 Matching Networkwith Balun
Fig. 3 Matching Networkwith two elements
STB5600
6/10
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STB5600TR

Mfr. #:
Buy STB5600TR
Manufacturer:
STMicroelectronics
Description:
RF Wireless Misc GPS Front-End
Lifecycle:
New from this manufacturer.
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