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PDF RF2658 Data sheet ( Hoja de datos )

Número de pieza RF2658
Descripción TRANSMIT MODULATOR/ IF AGC/ AND UPCONVERTER
Fabricantes RF Micro Devices 
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5
Typical Applications
• CDMA/FM Cellular Systems
• CDMA PCS Systems
• GSM/DCS Systems
RF2658
TRANSMIT MODULATOR, IF AGC, AND
UPCONVERTER
• TDMA Systems
• Spread Spectrum Cordless Phones
• Wireless Local Loop Systems
Product Description
The RF2658 is an integrated complete Quadrature Modu-
lator, IF AGC amplifier, and Upconverter developed for
the transmit section of dual-mode CDMA/FM cellular and
PCS applications and for GSM/DCS and TDMA systems.
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 Stan-
dard for CDMA cellular communications. This circuit is
part of RFMD’s line of complete solutions for digital radio
applications. The IC is manufactured on an advanced
15GHz FT Silicon Bipolar process, and is supplied in a
28-lead plastic SSOP package.
Optimum Technology Matching® Applied
üSi BJT
GaAs HBT
GaAs MESFET
Si Bi-CMOS
SiGe HBT
Si CMOS
1 27
Q SIG 2
Q REF 3
LO1- 8
LO1+ 9
I REF 5
I SIG 4
Quad.
÷2
Gain
Control
Σ
Band Gap
Reference
25 MOD OUT+
24 MOD OUT-
21 MIX IN-
22 MIX IN+
10 13 15 17 19 20
PIN 1
INDENT
6.20
5.79
3.99
3.81
0.25
0.10
10.01
9.80
0.36
0.23
TYP
0.635
TYP
1.73
1.47
0.25
0.10
1.27
0.38
NOTES:
1. Shaded lead is Pin1.
2. Lead frame material: Copper 194
3. Mold flash shall not exceed 0.006 (0.15 mm) per end.
4. Interlead flash shall not exceed 0.010 (0.25 mm) per side.
5. All dimensions are excluding mold flash and protrusions.
Package Style: QSOP-28
Features
• Similar to RF9958with increased IF range
• Supports Dual Mode Operation
• Digitally Controlled Power Down Modes
• 2.7V to 3.3V Operation
• Double-Balanced UHF Upconvert Mixer
• IF AGC Amp with 95 dB Gain Control
Ordering Information
RF2658
Transmit Modulator, IF AGC, and Upconverter
RF2658 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
5
Rev A8 010720
5-61

1 page




RF2658 pdf
RF2658
Pin
23
24
Function
GND2
MOD OUT-
Description
Interface Schematic
Same as pin 16.
One half of the balanced AGC output port. The impedance of this port
is 200balanced. 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
100
MOD OUT-
MOD OUT+
25 MOD OUT+ Same as pin 24, except complementary output.
See pin 24.
26
DEC
AGC decoupling pin. An external bypass capacitor of 10nF 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.
27 GC Analog gain control for AGC amplifiers. Valid control voltage ranges are
from 0.5VDC to 2.5VDC. The gain range for the AGC is 88dB. These
voltages are valid ONLY for a 37ksource impedance.
BIAS
21 k
GC
40 k
28
VCC2
Supply for the modulator stage only. A 10nF external bypass capacitor
is required and an additional 0.1µF will be required if no other low fre-
quency bypass capacitors are nearby. 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. The
part is designed to work from 2.7V to 3.3V supply.
5
Rev A8 010720
5-65

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