5-71
5
Preliminary
Product Description
Ordering Information
Typical Applications
Features
Functional Block Diagram
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Optimum Technology Matching® Applied
Si BJT
GaAs MESFET
GaAs HBT
Si Bi-CMOS
ü
SiGe HBT
Si CMOS
Band Gap
Rel
Bias
Supply
Quad
/2
Σ
48
45
46
47
44
43
42
41
40
39
38
37
13
16
15
14
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
NC
NC
RFOUT
VCC4
LO2+
LO2-
GND2
GND2
MIX_DEC
MIX IN+
MIX IN-
NC
36
35
34
33
32
31
30
29
28
27
26
25
SET2
PLLVCC
PLLGND
LD
DO
VCO+
VCO-
LO1+
LO1-
VCC1
VCO_ISET
NC
Lock
Detect
/R
/N
Charge
Pump
RF2668
CDMA/FM TRANSMIT MODULATOR, IF AGC,
AND UPCONVERTER WITH INTEGRATED PLL
• CDMA/FM Cellular and PCS Systems
• Tri-Mode/Dual-Band CDMA Applications
• W-CDMA Systems
• Wireless Local Loop Systems
• Spread-Spectrum Cordless Phones
• High Speed Data Modems
The RF2668 is an integrated complete quadrature modu-
lator, IF AGC amplifier, upconverter, and PLL, designed
for the transmit section of dual-mode CDMA/FM cellular,
PCS, and tri-mode CDMA applications. It is designed to
modulate baseband I and Q signals, amplify the resulting
IF signals while providing 95dB of gain control range, and
perform the final upconversion to UHF. Noise Figure, IP3,
and other specifications are designed to be compatible
with the IS-98 Interim Standard. This circuit is designed
as part of RFMD’s newest CDMA chipset, which also
includes the RF2667 CDMA/FM Receive IF AGC and
Demodulator. The IC is manufactured on an advanced
18GHz FT Silicon Bipolar process, and is supplied in a
48-lead plastic LQFP package.
• Supports Tri-Mode Operation
• Digitally Controlled Power Down Modes
• 2.7V to 3.3V Operation
• Digital First LO Quadrature Divider
• Double-Balanced UHF Upconvert Mixer
• IF AGC Ampwith95dBGainControl
RF2668
CDMA/FM Transmit Modulator, IF AGC, and
Upconverter with Integrated PLL
RF2668 PCBA-PCS/CEL
Fully Assembled Evaluation Boards
RF2668 PCBA-DO
Fully Assembled Evaluation Boards
5
Rev B4 010423
9.00
+ 0.20
sq.
0.22
+ 0.05
7.00
+ 0.10 sq.
7° MAX
0° MIN
0.35
0.25
0.50
1.40
+ 0.05
0.127
0.60
0.15
0.10
+
Package Style: LQFP-48_7x7
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