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PDF RF2668 Data sheet ( Hoja de datos )
| Número de pieza | RF2668 | |
| Descripción | CDMA/FM TRANSMIT MODULATOR/ IF AGC/ AND UPCONVERTER WITH INTEGRATED PLL | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Preliminary
RF2668
5 CDMA/FM TRANSMIT MODULATOR, IF AGC,
AND UPCONVERTER WITH INTEGRATED PLL
Typical Applications
• 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
Product Description
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.
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
48 47 46 45 44 43 42 41 40 39 38 37
NC 1
NC 2
Band Gap
Rel
RFOUT 3
VCC4 4
LO2+ 5
Bias
Supply
/R Lock
Detect
Charge
/N Pump
36 SET2
35 PLLVCC
34 PLLGND
33 LD
32 DO
LO2- 6
31 VCO+
GND2 7
30 VCO-
GND2 8
29 LO1+
MIX_DEC 9
28 LO1-
MIX IN+ 10
MIX IN- 11
Σ Quad
/2
27 VCC1
26 VCO_ISET
NC 12
25 NC
13 14 15 16 17 18 19 20 21 22 23 24
Functional Block Diagram
9.00
+ 0.20
sq.
7.00
+ 0.10 sq.
0.35
0.25
0.50
0.22
+ 0.05
7° MAX
0° MIN
1.40
+ 0.05
0.60
+ 0.15
0.10
0.127
Package Style: LQFP-48_7x7
Features
• 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 Amp with 95dB Gain Control
Ordering Information
RF2668
RF2668 PCBA-PCS/CEL
RF2668 PCBA-DO
CDMA/FM Transmit Modulator, IF AGC, and
Upconverter with Integrated PLL
Fully Assembled Evaluation Boards
Fully Assembled Evaluation Boards
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
5
Rev B4 010423
5-71
1 page  
Preliminary
RF2668
Pin Function Description
Interface Schematic
1 NC Not connected.
2 NC Not connected.
3 RF OUT RF output pin. An external shunt inductor to VCC plus a series blocking/
matching capacitor are required for 50Ω output.
VCC4
300 Ω
RF OUT
4
VCC4
Supply for the mixer stage only. The supply for the mixer is separated to
maximize IF to RF isolations and reduce the carrier leakage. A 10nF
external bypass capacitor is required. The trace length between the pin
and the bypass capacitors should be minimized. The ground side of the
bypass capacitors should connect immediately to ground plane.
5
LO2+
One half of the balanced mixer LO2 input. In single-ended applications,
the other half of the input, LO2- is AC grounded. This is a 50Ω imped-
BIAS
BIAS
ance port. This pin is NOT internally DC-blocked. An external blocking
capacitor (100pF recommended) must be provided if the pin is con-
nected to a device with DC present.
50 Ω
LO2+
50 Ω
LO2-
5
6
LO2-
One half of the balance mixer LO2 input. In single ended applications, See pin 5.
this pin is AC grounded with a 100pF capacitor.
7
GND2
Ground connection for the mixer stage. For best performance, keep
traces physically short and connect immediately to ground plane.
8
GND2
Same as pin 7.
9 MIX_DEC Current Mirror decoupling pin. A 1000pF external capacitor is required
to bypass this pin. The ground side of the bypass capacitors should
connect immediately to ground plane.
10 MIX IN+ Same as pin 11, except complementary input.
See pin 11.
11 MIX IN- One half of the 200Ω balanced impedance input to the mixer stage.
This pin is NOT internally DC-blocked. An external blocking capacitor
BIAS
(1000pF recommended) must be provided if the pin is connected to a
device with DC present. If no IF filter is needed this pin may be con-
100 Ω
nected to MOD OUT+ through a DC blocking capacitor. An appropriate
matching network may be needed if an IF filter is used.
MIX IN-
BIAS
100 Ω
MIX IN+
12 NC Not connected.
13 NC Not connected.
14 MOD OUT- One half of the balanced AGC output port. The impedance of this port
is 200Ω balanced. If no filtering is required, this pin can be connected
to the MIX IN- pin through a DC blocking capacitor. This pin requires an
inductor to VCC to achieve full dynamic range. In order to maximize
gain, this inductor should be a high-Q type and should be parallel reso-
nated out with a capacitor (see application schematic). This pin is NOT
DC-blocked. A blocking capacitor of 2200pF is needed when this pin is
connected to a DC path. An appropriate matching network may be
needed if an IF filter is used.
VCC3
VCC3
100 Ω
100 Ω
MOD OUT-
MOD OUT+
15 MOD OUT+ Same as pin 14, except complementary output.
See pin 14.
16
GND1
Ground connection for all baseband circuits including bandgap, AGC,
flip-flop, modulator and FM amp. For best performance, keep traces
physically short and connect immediately to ground plane.
Rev B4 010423
5-75
5 Page 
Preliminary
RF2668
Application Schematic
Tri-Mode/Dual-Band Operation
10 nF
MIX VCO PLL
VCC MODE CE AGC EN EN ON
270 Ω
1 nF
10 nF VCC
4.7 pF
RF OUT (CELL)
4.7 pF
12 nH
8 nH
RF OUT (PCS)
8.2 nH
3.9 nH
0.5 pF
VCC
10 nF
LO2
100 pF
100 pF
MIX IN+
MIX IN-
1 nF
1 nF
1 nF
MOD OUT-
MOD OUT+
1 nF
48 47 46 45 44 43 42 41 40 39 38 37
1
Band Gap
Rel
2
3
4
5
Bias
Supply
/R Lock
Detect
Charge
/N Pump
36
35
34
33 LD
32
6 31
7 30
10 nF
1 nF
2.2 nF
36 kΩ 220 pF 33 pF
D1 39 nH
** 10 nF
39 nH
8 29
200 Ω
9 28
Σ10
Quad
27
/2
11 26
12 25
13 14 15 16 17 18 19 20 21 22 23 24
10 nF
47 kΩ
VCC
VCC
10 nF
1 nF
10 nF
L1* L2*
1 nF
39 kΩ
10 nF
*L1 and L2 are the bias
choke inductor.
**Denotes components not normally populated.
VGC
OSIG
REF ISIG
OSC REF
SET1
SET2
DO
VCC
**
3.9 kΩ
VTUNE
DO
LO1+
LO1-
VCC
5
Rev B4 010423
5-81
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RF2668.PDF ] | |
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