srf-2724cs RF Micro Devices, srf-2724cs Datasheet - Page 7

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

Prelim DS090410
Pin
32
1
2
3
9
Function
RXON
DOUT
PAON
XCEN
FREF
Description
Serial digital output after demodulation, chip rate filtering and center data
slicing. A CMOS level output (VSS to VDD) with controlled slew rates. A low
drive output designed to drive a PCB trace and a CMOS logic input while
generating minimal RFI. In digital test modes this pin becomes a test
access port controlled by the serial control bus.
Enables the bandgap reference and voltage regulators when high. Con-
sumes only leakage current in STANDBY mode when low. This is a CMOS
input, and the thresholds are referenced to VDD and VSS.
TX/RX Control Input. Switches the transceiver between TRANSMIT and
RECEIVE modes. Circuits are powered up and signal paths reconfigured
according to the operating mode. This is a CMOS input, and the thresholds
are referenced to VDD and VSS.
PA Control Output. Enables the off-chip PA at the correct times in a Trans-
mit slot. Goes high when transmit RF is present at TXO; goes low 5μs
before transmit RF is removed from TXO. Has interlock logic to shut down
the PA if the PLL does not lock.
Input for the 12.288MHz or 6.144MHz reference frequency. This input is
used as the reference frequency for the PLL and as a calibration frequency
for the on-chip filters. An AC-coupled sine or square wave source drives this
self-biased input.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
Proposed
Mode Control and Interface Lines
Data, cont.
SRF-2724CS
Interface Schematic
RXON
DIN
RXON
DIN
XCEN
XCEN
FRE F
9
1
2
30
1
2
30
250 Ω
VCCA
VS S
24
8
VDD
VDD
VSS
VSS
31
31
8
8
VDD
31
8
40k
VSS
VDD
31
8
40k
VSS
3
32 DOUT
PAON
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