RF2926 Datasheet PDF - RF Micro Devices
| Part Number | RF2926 | |
| Description | UHF DUAL CONVERSION TRANSCEIVER | |
| Manufacturers | RF Micro Devices | |
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11
Typical Applications
• Wireless Meter Reading
• Keyless Entry Systems
• 433/868/915MHz ISM Band Systems
RF2926
UHF DUAL CONVERSION TRANSCEIVER
• Wireless Data Transceiver
• Wireless Security Systems
• Battery Powered Portable Devices
Product Description
The RF2926 is a monolithic integrated circuit intended for
use as a low cost FM transceiver. The device is provided
in 48-lead plastic TQFP packaging and is designed to
provide a dual conversion, half-duplex transceiver. The
chip is intended for linear (AM, FM) or digital (ASK, FSK,
OOK) applications in the North American 915MHz and
European 433/868MHz ISM bands. The integrated VCO
has a buffered output to feed the RF signal back to the
PLL IC to form the frequency synthesizer. Separate RX
ENABL, TX ENABL, and PLL ENABL lines allow for half
duplex operation as well as turning on the VCO to give
the synthesizer time to settle and complete power down-
mode.
.362
.346
.362
.346
.280
.272
7°MAX
0°MIN
.280
.272
.011
.007
.057
.053
.031 .007
.021 MAX
.006
.002
.020
Optimum Technology Matching® Applied
üSi BJT
GaAs HBT
GaAs MESFET
Si Bi-CMOS
SiGe HBT
Si CMOS
TX OUT 2
RX IN 4
46
Gain
Control
44
37 36
39
LNA OUT 8
MIX CA 43
MIX IN 10
MIX OUT+ 12
MIX OUT- 13
RSSI
15 14 16 18 25 20 21 22 23 24
35 VCO OUT
34 MOD IN
31 RESNTR-
30 RESNTR+
28 DEMOD IN
26 FM OUT
27 DATA REF
Functional Block Diagram
Package Style: LQFP-48
Features
• Monolithic Integrated Transceiver
• 2.7V to 5.0V Supply Voltage
• Narrow Band and Wide Band FM/FSK
• 300MHz to 1000MHz Frequency Range
• 130MHz Bandwidth in First IF
• 5mW Output Power at 433MHz
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Ordering Information
RF2926
UHF Dual Conversion Transceiver
RF2926 PCBA Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A5 010404
11-185
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RF2926
Pin Function Description
Interface Schematic
16 IF1 BP- See pin 14.
See pin 15.
17
GND7
Ground connection for 40dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
18 IF1 OUT IF output from the 40dB limiting amplifier. The IF1 OUT output presents
a nominal 330 Ω output resistance and interfaces directly to 10.7MHz
ceramic filters.
IF1 OUT
19
GND6
Ground connection for 60dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
20 VREF IF DC voltage reference for the IF limiting amplifiers. A 10nF capacitor
from this pin to ground is required.
21
IF2 IN
IF input to the 60dB limiting amplifier strip. A 10nF DC blocking capaci-
tor is required on this input. The IF2 IN input presents a nominal 330 Ω
input resistance and interfaces directly to 10.7MHz ceramic filters.
IF2 BP+
60 kΩ
IF2 BP-
60 kΩ
330 330
IF2 IN
22 IF2 BP+ DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass See pin 20.
capacitor from this pin to ground is required.
23 IF2 BP- See pin 21.
See pin 20.
24 DATA OUT Demodulated data output from the demodulator. Output levels on this
are TTL/CMOS compatible. The magnitude of the load impedance is
intended to be 1MΩ or greater.
DATA OUT
25
RSSI
A DC voltage proportional to the received signal strength is output from
this pin. The output voltage range is 0.5V to 2.5V and increases with
increasing signal strength.
26 FM OUT Linear output from the FM demodulator. This pin is used in analog
applications when signal fidelity is important.
VCC
RSSI
FM OUT
11
27 DATA REF This pin is used for setting the adaptive Data Slicer DC reference level.
A capacitor from this pin to ground can be used to set the reference
level at the average DC level of the data bit stream.The DC level deter-
mines the bit decision threshold.
50 kΩ
DATA REF
28 DEMOD IN This pin is the input to the FM demodulator. This pin is NOT AC cou-
VCC
pled. Therefore, a DC blocking capacitor is required on this pin to avoid
shorting the demodulator input with the LC tank. A ceramic discrimina- IF Output
tor or DC blocked LC tank resonant at the IF should be connected to
this pin.
VCC
10 kΩ
DEMOD IN
29
VCC4
This pin is used is supply DC bias to the 60dB IF limiting amplifier. An
IF bypass capacitor should be connected directly to this pin and
returned to ground. A 10nF capacitor is recommended for 10.7MHz IF
applications.
Rev A5 010404
11-189
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| Information | Total 10 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ RF2926.PDF Datasheet ] | |
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