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參數(shù)資料
| 型號： | RF2721 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | QUADRATURE DEMODULATOR |
| 中文描述： | TELECOM, CELLULAR, BASEBAND CIRCUIT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 66K |
| 代理商： | RF2721 |
Preliminary
2-30
RF2721
Rev A2 010509
7
Q
D
Pin
10
Function
I OUT
Description
Demodulated baseband I output. The reference DC level of this pin is
set by the voltage of pin 9 (REF IN), which is connected to this pin
through a 5k
resistor to the collectors of this push-pull output. This
results in an output impedance of 5k
if the REF IN pin is connected to
a low impedance source. The capacitance of the load determines the
maximum baseband frequency. A very low capacitive load may stretch
the 3dB bandwidth over 10MHz. Another way to increase bandwidth is
by connecting a shunt resistor. This will trade gain for bandwidth.
Same as pin 2.
Interface Schematic
See pin 8.
11
12
GND
PD
Power down control. When this pin is "low", all circuits are shut off. A
"low" is typically 0.8V or less at room temperature. When this pin is
"high", all circuits are operating normally.
13
VCC
Power supply pin. An external 100nF bypass capacitor is recom-
mended if no other bypass capacitor is nearby.
Balanced IF input. An input level of 400mV
PP
gives full output swing; a
level of maximum 250mV
PP
is recommended for linear operation. This
pin has no internal DC block and an external capacitor of 100nF is
needed if connected to a DC path. If the IF is driven by a single-ended
source, connect this pin to an 100nF capacitor to ground.
14
IF IN-
See pin 1.
VCC
PD
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