STB5600 Datasheet, PDF (5/10 Pages) STMicroelectronics – GPS RF FRONT-END IC

ELECTRICAL CHARACTERISTICS (Continued)
OUTPUT SECTION
Symb ol
P a ram et er
I_VCCDRIVE Supply Current
VOH High output voltage
V_OL Low output volt age
t_r
Rise Time
tf
Fall Time
Note
V_VCCDRIVE = 3 V
Vp = VVCCDRIVE = 3 V
Vn = GNDDRIVE
C_LOAD = 7 pF
CLOAD = 7 pF
STB5600
Min.
Vp-0.4
Vn
Typ .
8
6
2
M ax.
Vp
Vn +0. 4
Unit
mA
V
V
ns
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 the noise 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
5/10