RF2494 데이터 시트보기 (PDF) - RF Micro Devices
부품명
상세내역
일치하는 목록
RF2494 Datasheet PDF : 14 Pages
| |||
Preliminary
RF2494
Pin Function Description
Interface Schematic
1
PD
The power enable pin. When PD is >VCC- 300mV, the part is biased
on. When PD is <300mV, then the part is turned off and typically draws
less than 1µA.
2
VCC1
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.
3
VCC2
Supply voltage for LO_Buffer. A 10pF bypass capacitor is required and See pin 6.
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.
4
MIXOUT- 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-.
MIX OUT+ MIX OUT-
5
MIXOUT+ The non-inverting open collector output of the mixer. This pin needs to See pin 4.
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
8
IF) from VCC to MIXOUT+.
6
LO IN
LO input pin. This input needs a DC-blocking cap. External matching is
VCC2
recommended to 50Ω.
LO IN
7
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.
8
VCC3
Supply voltage for mixer preamp.
See pin 10.
9
GND3
Ground pin for mixer preamp. This lead inductance is intended to be See pin 10.
similar to VCC3 lead inductance.
10
MIX IN
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
MIX IN
GND3
11
NC
Not connected.
12
NC
Not connected.
Rev A0 010730
8-55
Share Link: 