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參數(shù)資料
| 型號： | RF2444 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | HIGH FREQUENCY LNA/MIXER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO16 |
| 封裝： | SSOP-16 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 225K |
| 代理商： | RF2444 |
8-56
RF2444
Rev A3 010717
8
F
Pin
1
Function
GAIN SEL
Description
LNA gain control. When GAIN SEL is >V
CC
-300mV, LNA gain is at 10
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.
The power enable pin. When PD is >V
CC
-300mV, the part is biased
on. When PD is <300mV, then the part is turned off and typically draws
less than 1
μ
A.
Supply voltage for bias circuits and logic control. A 10pF external
bypass capacitor is required and an additional 0.01
μ
F 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.
Supply voltage for LO_Buffer. A 10pF bypass capacitor is required and
an additional 0.01
μ
F 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.
The inverting open collector output of the mixer. This pin needs to 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-.
The non-inverting open collector output of the mixer. This pin needs to
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+.
LO input pin. This input needs a DC blocking cap. External matching is
recommended to 50
.
Interface Schematic
See pin 16.
2
LNA IN
See pin 16.
3
PD
4
VCC1
5
VCC2
See pin 8.
6
MIXOUT-
7
MIXOUT+
See pin 6.
8
LO IN
9
RX EN
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.
Supply voltage for mixer preamp.
10
11
VCC3
GND3
See pin 12.
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.
See pin 12.
12
MIX IN
MIX OUT+
MIX OUT-
LO IN
VCC2
VCC3
GND3
MIX IN
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