srf-2724cs RF Micro Devices, srf-2724cs Datasheet - Page 6

• Manufacturer Part Number: srf-2724cs
• Description: 2.4ghz Low-if 1.5mbps Fsk Transceiver
• Manufacturer: RF Micro Devices

SRF-2724CS
6 of 26
Pin
17
21
22
30
7
Function
TXOB
AOUT
RX1
TXO
DIN
Description
Receive RF Input. Nominal impedance at 2445MHz is 2.6-j2.6 with a sim-
ple matching network required for optimum noise figure. This input con-
nects to the base of an NPN transistor and should be AC coupled.
TX RF open-collector output. This output requires a DC path to VCCA.
Complementary TX RF open-collector output. This output requires a DC
path to VCCA. For single-ended output applications, this pin should be con-
nected to a dummy load that includes a DC path to VCCA.
Multi-function Output. In Analog output mode this is output drives an off
chip data slicer. In Transmit power control mode this is an open drain out-
put, which is pulled low when the TPC bit is serial register #1, is clear. Tran-
sitions on TPC are synchronized to the falling edge of RXON. In analog test
modes this pin and the RSSI output become test access points controlled
by the serial control bus.
Transmit Data Input. Drives the transmit pulse shaping circuits. Serial digi-
tal data on this pin becomes FSK modulation on the Transmit RF output.
The logic timing on this pin controls data timing. Internal circuits determine
the modulation deviation. This is a standard CMOS input referenced to
VDD and VSS.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
Transmit/Receive
Data
Proposed
Interface Schematic
See Pin 1 below.
V SS
8
TPC
GNDRF
RXI
17
18
A OUT
M UX
MUX
MUX
T PC
TP Q
TXO
TXO
21
21
VCCA
Prelim DS090410
24
VSS
8
100 Ω
GNDRF
GNDRF
VSS
VCCA
18
18
TXOB
TXOB
(PIN 8)
22
22
0.7V
(PIN 24)
VDD
V S S
31
8
4k
7
A OUT