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Micrel, Inc.
Pin Description
MICRF002/RF022
Pin Number
SOIC-16
1
Pin Number
SOIC-8
–
Pin Name
SEL0
Pin Name
Bandwidth Selection Bit 0 (Digital Input): Used in conjunction with SEL1 to set
the desired demodulator filter bandwidth. See Table 1. Internally pulled-up to
VDDRF.
2, 3
4
1
2
VSSRF
ANT
RF Power Supply: Ground return to the RF section power supply.
Antenna (Analog Input): For optimal performance the ANT pin should be
impedance matched to the antenna. See “Applications Information” for
information on input impedance and matching techniques.
5
6
3
–
VDDRF
VDDBB
RF Power Supply: Positive supply input for the RF section of the IC.
Base-Band Power Supply: Positive supply input for the baseband section
(digital section) of the IC.
7
4
CTH
Data Slicing Threshold Capacitor (Analog I/O): Capacitor connected to this
pin extracts the dc average value from the demodulated waveform which
becomes the reference for the internal data slicing comparator.
8
9
–
–
NC
VSSBB
Not internally connected
Base-Band Power Supply: Ground return to the baseband section power
supply.
10
11
5
6
DO
SHUT
Data Output (Digital Output)
Shutdown (Digital Input): Shutdown-mode logic-level control input. Pull low to
enable the receiver. Internally pulled-up to VDDRF.
12
–
WAKEB
Wakeup (Digital Output): Active-low output that indicates detection of an
incoming RF signal.
13
7
CAGC
Automatic Gain Control (Analog I/O): Connect an external capacitor to set the
attack/decay rate of the on-chip automatic gain control.
14
–
SEL1
Bandwidth Selection Bit 1 (Digital Input): Used in conjunction with SEL0 to set
the desired demodulator filter bandwidth. See Table 1. Internally pulled-up to
VDDRF.
15
16
8
–
REFOSC
SWEN
Reference Oscillator: Timing reference, sets the RF receive frequency.
Sweep-Mode Enable (Digital Input): Sweep- or Fixed-mode operation control
input. SWEN high= sweep mode; SWEN low = conventional superheterodyne
receiver. Internally pulled-up to VDDRF.
July 2008
3
M9999-070808
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