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RX6000 (R) 10/20/14 Page 10 of 10
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18 CNTRL0 CNTRL0 is used with CNTRL1 to control the receiver modes. CNTRL0 is a high-impedance input (CMOS compatible). An
input voltage of 0 to 300 mV is interpreted as a logic low. An input voltage of Vcc - 300 mV or greater is interpreted as a logic
high. An input voltage greater than Vcc + 200 mV should not be applied to this pin. A logic high requires a maximum source
current of 40 µA. Sleep mode requires a maximum sink current of 1 µA. This pin must be held at a logic level; it cannot be left
unconnected.
19 GND3 GND3 is an IC ground pin. It should be connected to GND1 by a short, low inductance trace.
20 RFIO RFIO is the receiver RF input pin. This pin is connected directly to the SAW filter transducer. Antennas presenting an imped-
ance in the range of 35 to 72 ohms resistive can be satisfactorily matched to this pin with a series matching coil and a shunt
matching/ESD protection coil. Other antenna impedances can be matched using two or three components. For some imped-
ances, two inductors and a capacitor will be required. A DC path from RFIO to ground is required for ESD protection.
SM-20H PCB Pad Layout
Dimensions in inches.
.09
.370
0.000
0
.
0
0
0
.065
.105
.145
.185
.225
.265
.305
.345
.
0
9
0
.435
.
1
2
2
5
.
1
6
2
5
.
1
4
7
5
.
1
8
7
5
.
2
2
0
.
3
1
0
Note: Specifications subject to change without notice.
