AMIS-52150 Datasheet, PDF (5/21 Pages) AMI SEMICONDUCTOR – Low-Power Transceiver with Clock and Data Recovery

AMIS−52150
PIN DESCRIPTIONS
RX1, Rx2, RF Input Pins
RX1 and RX2 are the RF antenna inputs to the
AMIS−52150. The internal circuit designs are identical
between these inputs. For the AMIS−52150 receiver inputs,
RX1 and RX2, external components are required in order to
match the low noise amplifier (LNA) to external devices
such as antennas. The external components must provide a
DC voltage path to the RF ground. Figure 2 suggests an
external circuit for the receiver inputs at 403 MHz. Each
circuit’s input impedance can be trimmed internally to
compensate for manufacturing and external component
tolerances. The circuits employ an LNA, internal filters, a
low frequency, intermediate frequency (IF), and a received
signal strength indication (RSSI) circuit to recover the
ASK/OOK modulated data. The signals in the two input
channels are “summed” before the data recovery circuit.
The functions of the receive circuits are controlled by
writing to the registers shown in Table 5.
Table 5. RECEIVER CONTROL REGISTER DESCRIPTION
RX1 or RX2 Receiver Register Control
Register (HEX)
Name
Bits
States
Comments
0x00
ANT1 Trim
All
Inverse Relationship Register Value to Internal Capacitance
0x01
ANT2 Trim
All
Inverse Relationship Register Value to Internal Capacitance
0x0c
ANT1 Enable
0
0
Antenna Port is Off
1
Antenna Port is On
ANT2 Enable
1
0
Antenna Port is Off
1
Antenna Port is On
Figure 2. Typical Input Impedance Match to 50 W (402 MHz)
VCO1, VCO2, Voltage Controlled Oscillator Pins
The VCO1 and VCO2 pins connect a parallel combination
of a capacitor and an inductor to the AMIS−52150 internal
voltage controlled oscillator (VCO). The external LC
(parallel inductor and capacitor) circuit sets the frequency of
the internal VCO. The VCO frequency must be set to twice
the value of the desired TX or RX frequency. Typical
components for the tuning of the VCO at 402 MHz are
shown in Figure 3. The range of the VCO frequency is from
600 MHz to 1536 MHz.
The voltage on these pins can be used to determine proper
operation of the PLL/VCO circuits.
Figure 3. Typical Components for VCO Tuning at 402 MHz
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