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PDF RF9958 Data sheet ( Hoja de datos )
| Número de pieza | RF9958 | |
| Descripción | CDMA/FM TRANSMIT MODULATOR/ IF AGC/ AND UPCONVERTER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RF9958 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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5
Typical Applications
• CDMA/FM Cellular Systems
• CDMA PCS Systems
• Wireless Local Loop Systems
RF9958
CDMA/FM TRANSMIT MODULATOR, IF AGC,
AND UPCONVERTER
• Spread Spectrum Cordless Phones
• High Speed Data Modems
• General Purpose Digital Transmitters
Product Description
The RF9958 is an integrated complete Quadrature Modu-
lator, IF AGC amplifier, and Upconverter designed for the
transmit section of dual-mode CDMA/FM cellular and
PCS applications. It is designed to modulate baseband I
and Q signals, amplify the resulting IF signals while pro-
viding 95dB of gain control range, and perform the final
upconversion to UHF. Noise Figure, IP3, and other specifi-
cations are designed to be compatible with the IS-98
Interim Standard for CDMA cellular communications. This
circuit is designed as part of RFMD’s newest CDMA Chip
Set, which also includes the RF9957 CDMA/FM Receive
IF AGC and Demodulator. The IC is manufactured on an
advanced 15GHz FT Silicon Bipolar process, and is sup-
plied 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
Functional Block Diagram
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
7° 1.47
0.25
0.10
8°
1.27
0°
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
• Supports Dual 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 95 dB Gain Control
Ordering Information
RF9958
RF9958 PCBA
CDMA/FM Transmit Modulator, IF AGC, and Upcon-
verter
Fully Assembled Evaluation Board
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 B11 010720
5-93
1 page  
RF9958
Pin
10
11
12
13
14
15
Function
BG OUT
VCC3
GND1
PD1
VCC4
PD2
Description
Bandgap voltage reference. This voltage, constant over temperature
and supply variation, is used to bias internal circuits. A 1nF external
bypass capacitor is required.
Supply voltage for the AGC and the Bandgap circuitry. A 1nF external
bypass capacitor is required and an additional 0.1µF will be required if
no other low frequency 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.
Same as pin 6.
Interface Schematic
Power down control for overall circuit. When logic “high” (≥VCC-0.7V),
all circuits are operating; when logic “low” (≤0.5V), all circuits are
turned off. The input impedance of this pin is >10kΩ. A DC voltage less
than or equal to the maximum allowable Vcc may be applied to this pin
when no voltage is applied to the Vcc pins.
10 kΩ
PD1
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 100pF
external bypass capacitor is required and an additional 0.1µF will be
required if no other low frequency bypass capacitors are nearby. The
trace length between the pin and the bypass capacitors should be min-
imized. The ground side of the bypass capacitors should connect
immediately to ground plane.
Power down control for mixer only. When connected to pin 10 (BG
OUT) the mixer circuits are operating; when connected to ground
(≤0.5V), the mixer is turned off but all other circuits are operating. A DC
voltage less than or equal to the maximum allowable Vcc may be
PD2
1 kΩ
applied to this pin when no voltage is applied to the Vcc pins.
450 Ω
16
GND2
Ground connection for the mixer stage. Keep traces physically short
and connect immediately to ground plane for best performance.
17
RF OUT RF output pin. An external shunt inductor to VCC plus a series blocking/
VCC4
matching capacitor are required for 50Ω output.
300 Ω
RF OUT
5
18
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.
19
LO2+
One half of the balanced mixer LO2 input. In single-ended applications,
BIAS
the other half of the input, LO2- is AC grounded. This is a 50Ω imped-
ance port. This pin is NOT internally DC blocked. An external blocking
capacitor (100pF recommended) must be provided if the pin is con-
40 Ω
nected to a device with DC present.
LO2+
BIAS
40 Ω
LO2-
20 LO2-
21 MIX IN-
Rev B11 010720
One half of the balance mixer LO2 input. In single ended applications,
this pin is AC grounded with a 100pF capacitor.
One half of the 200Ω balanced impedance input to the mixer stage.
This pin is NOT internally DC blocked. An external blocking capacitor
(2200pF 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-
nected to MOD OUT+ through a DC blocking capacitor. An appropriate
matching network may be needed if an IF filter is used.
See pin 19.
BIAS
100 Ω
MIX IN-
BIAS
100 Ω
MIX IN+
5-97
5 Page 
RF9958
5
Rev B11 010720
5-103
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RF9958.PDF ] | |
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