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參數(shù)資料
| 型號(hào)： | RF2668 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | CDMA/FM TRANSMIT MODULATOR, IF AGC, AND UPCONVERTER WITH INTEGRATED PLL |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT |
| 封裝： | 7 X 7 MM, PLASTIC, LQFP-48 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 430K |
| 代理商： | RF2668 |
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Preliminary
5-75
RF2668
Rev B4 010423
5
M
U
Pin
1
2
3
Function
NC
NC
RF OUT
Description
Not connected.
Interface Schematic
Not connected.
RF output pin. An external shunt inductor to V
CC
plus a series blocking/
matching capacitor are required for 50
output.
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.
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 50
imped-
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.
5
LO2+
6
LO2-
One half of the balance mixer LO2 input. In single ended applications,
this pin is AC grounded with a 100pF capacitor.
Ground connection for the mixer stage. For best performance, keep
traces physically short and connect immediately to ground plane.
Same as pin 7.
See pin 5.
7
GND2
8
9
GND2
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.
Same as pin 11, except complementary input.
10
11
MIX IN+
MIX IN-
See pin 11.
One half of the 200
balanced impedance input to the mixer stage.
This pin is NOT internally DC-blocked. An external blocking capacitor
(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-
nected to MOD OUT+ through a DC blocking capacitor. An appropriate
matching network may be needed if an IF filter is used.
12
13
14
NC
NC
Not connected.
Not connected.
MOD OUT-
One half of the balanced AGC output port. The impedance of this port
is 200
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 V
CC
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.
15
16
MOD OUT+
GND1
Same as pin 14, except complementary output.
See pin 14.
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.
RF OUT
300
V
CC4
50
BIAS
50
BIAS
LO2+
LO2-
100
BIAS
100
BIAS
MIX IN-
MIX IN+
100
100
MOD OUT-
MOD OUT+
V
CC3
V
CC3
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