RFRXD0420 Datasheet, PDF (4/32 Pages) Microchip Technology – UHF ASK/FSK/FM Receiver

rfRXD0420/0920
TABLE 1-1: rfRXD0420/0920 PINOUT I/O DESCRIPTION
Pin Name
Pin Number Pin Type Buffer Type
Description
LNAGAIN
2
I
CMOS
LNA gain control (with hysteresis)
LNAOUT
3
O
Analog
LNA output (open collector)
1IFIN
4
I
Analog
1st IF stage input
1IF+
6
--
Analog
MIXER1 bias (open collector)
1IF-
7
--
Analog
MIXER1 bias (open collector)
1IFOUT
9
O
Analog
1st IF stage output
2IFIN
11
I
Analog
2nd IF stage input
FBC1
12
--
Analog
Limiter IF Amplifier external feedback capacitor
FBC2
13
--
Analog
Limiter IF Amplifier external feedback capacitor
2IFOUT
15
O
Analog
2nd IF stage output
DEMIN
16
I
Analog
Demodulator input
OPA
18
O
Analog
Operational amplifier output
OPA-
19
I
Analog
Operational amplifier input (negative)
OPA+
20
I
Analog
Operational amplifier input (positive)
RSSI
21
O
Analog
Received signal strength indicator output
DEMOUT+
23
O
Analog
Demodulator output (positive)
DEMOUT-
24
O
Analog
Demodulator output (negative)
XTAL
26
I
Analog
Crystal oscillator input
ENRX
28
I
CMOS
Receiver enable input
LF
29
I
Analog
External loop filter connection. Common node of
charge pump output and VCO tuning input.
LNAIN
31
I
Analog
LNA input
VDD
8, 14, 17, 27, 32
P
Positive supply
VSS
1, 5, 10, 25, 30
P
Ground reference
Legend: I = Input, O = Output, I/O = Input/Output, P = Power, CMOS = CMOS compatible input or output
DS70090A-page 4
Preliminary
 2003 Microchip Technology Inc.