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RF2444 参数 Datasheet PDF下载

RF2444图片预览
型号: RF2444
PDF下载: 下载PDF文件 查看货源
内容描述: 高频低噪声放大器/混频器 [HIGH FREQUENCY LNA/MIXER]
分类和应用: 放大器
文件页数/大小: 16 页 / 227 K
品牌: RFMD [ RF MICRO DEVICES ]
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RF2444  
Pin  
1
Function Description  
Interface Schematic  
LNA gain control. When GAIN SEL is >V - 300mV, LNA gain is at 10 See pin 16.  
GAIN SEL  
CC  
dB. When GAIN SEL is <300mV, the LNA gain is -6dB.  
This pin is NOT internally DC blocked. An external blocking capacitor  
must be provided if the pin is connected to a device with DC present. If  
a blocking capacitor is required, a value of 2pF is recommended.  
See pin 16.  
2
3
4
LNA IN  
The power enable pin. When PD is >V - 300mV, the part is biased  
PD  
CC  
on. When PD is <300mV, then the part is turned off and typically draws  
less than 1µA.  
Supply voltage for bias circuits and logic control. A 10pF external  
bypass capacitor is required and an additional 0.01µF is 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.  
VCC1  
Supply voltage for LO_Buffer. A 10pF bypass capacitor is required and See pin 8.  
an additional 0.01µF is required if there is no other low frequency  
bypass capacitor in the area. 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
6
VCC2  
The inverting open collector output of the mixer. This pin needs to be  
MIXOUT-  
MIX OUT+  
MIX OUT-  
externally biased and DC isolated from other parts of the circuit. This  
output can drive a Balun, with MIXOUT+, to convert to unbalanced to  
drive a SAW filter. The Balun can be either broadband (transformer) or  
narrowband (discrete LC matching). Alternatively, MIXOUT+ may be  
used alone to drive a SAW single-ended, with an RF choke (high Z at  
IF) from VCC to MIXOUT-.  
8
The non-inverting open collector output of the mixer. This pin needs to See pin 6.  
be externally biased and DC isolated from other parts of the circuit.  
This output can drive a Balun, with MIXOUT+, to convert to unbalanced  
to drive a SAW filter. The Balun can be either broadband (transformer)  
or narrowband (discrete LC matching). Alternatively, MIXOUT+ may be  
used alone to drive a SAW single-ended, with an RF choke (high Z at  
IF) from VCC to MIXOUT+.  
7
8
MIXOUT+  
LO IN  
LO input pin. This input needs a DC blocking cap. External matching is  
recommended to 50.  
VCC2  
LO IN  
This control pin allows the mixer output pins to be put into a high  
impedance state. This allows the transmit signal path to share the  
same IF filter as the receiver.  
9
RX EN  
Supply voltage for mixer preamp.  
See pin 12.  
See pin 12.  
10  
11  
VCC3  
GND3  
Ground pin for mixer preamp. This lead inductance should be kept  
small.  
Mixer RF Input port. This pin is NOT internally DC blocked. An external  
blocking capacitor must be provided if the pin is connected to a device  
with DC present. A value of >22pF is recommended. To minimize the  
noise figure it is recommended to have a bandpass filter before this  
input. This will prevent the noise at the image frequency from being  
converted to the IF.  
VCC3  
12  
MIX IN  
MIX IN  
GND3  
8-56  
Rev A3 010717