RF2670
10
Typical Applications
• Digital Cordless Telephones
• Secure Communication Links
• Wireless LANs
• Inventory Tracking
• Wireless Security
• Battery Powered Applications
8MHZ DUAL BASEBAND AGC WITH
PROGRAMMABLE LOW PASS FILTERING
Product Description
The RF2670 is a monolithic integrated circuit specifically
designed for direct conversion to baseband QPSK receiv-
ers. The part provides dual baseband amplifiers with a
70dB gain range (single pin analog input) and separate I
and Q RSSI. On-chip programmable baseband filters are
incorporated into each amplifier providing 1MHz, 2MHz,
4MHz, or 8MHz bandwidth with a 5-pole Bessel
response. I and Q output are available in digital or analog
form. The data comparators use a self generated DC ref-
erence to track DC offsets in the received signal. The
analog outputs have a 500mVpp swing with approxi-
mately 1.7V DC offset. A 2.0V reference voltage is also
available for A/D converters changing DC bias.
1
.157
.150
.033
.010
.004
.344
.337
.012
.008
.025
.244
.228
8°MAX
0°MIN
.069
.053
.050
.016
.010
.008
Optimum Technology Matching® Applied
Package Style: SSOP-24
10
IF AMPLIERS
ü
Si Bi-CMOS
Si BJT
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
Features
• I/Q Baseband Receivers
• 10dB to 80dB Gain Range
VCC1
20
IN Q+
IN Q-
23
24
0-25 dB
0-20 dB
-12-+12
17dB
VCC2
• Digital and Analog Outputs
15 Q DATA
18 IF OUT Q
21 DCFB Q
5
VCC3
8
• On-Chip Selectable IF Bandwidths
• Reference Voltage for A/D Converter
• 2.7V to 3.6V Operation
6 dB
PD
BW SEL2
BW SEL1
11
14
13
DC
Bias
10 RSSI I
17 VREF
16 RSSI Q
19 VGC
IN I+
IN I-
2
1
9 I DATA
7 IF OUT I
4 DCFB I
Ordering Information
RF2670
RF2670PCBA
8MHz Dual Baseband AGC with Programmable Low
Pass Filtering
Fully Assembled Eval Board.
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Functional Block Diagram
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Rev A4 010820
10-45
RFMD [ RF MICRO DEVICES ]
