RF250-32 Ver la hoja de datos (PDF) - Conexant Systems
Número de pieza
componentes Descripción
Lista de partido
RF250-32 Datasheet PDF : 17 Pages
| |||
RF250
Rx ASIC
Pin #
29
30
31
32
Name
VGA_PCS_IN–
VGA_PCS_IN+
CELL_MIX_BYPASS
CDMA_IF_OUT–
33
CDMA_IF_OUT+
34
AMPS_IF_OUT
35
PCS_IF_OUT–
36
PCS_IF_OUT+
37
PCS_MIX_BYPASS
38
PCS_LO
39
CELL_LO
40
PCS_MIX_IN
41
VCC4
42
CELL_MIX_IN
43
CELL_IFTRAP
44
CELL_MIX_GND
45
NC
46
PCS_BIAS_SET
47
GND
48
CELL_LNA_OUT
Table 2. RF250 Signal Description (2 of 2)
Description
PCS differential VGA input.
PCS differential VGA input.
Low frequency bypass for the AMPS mixer.
CDMA differential mixer output. Requires an external inductor to VCC. Output impedance is
set by an external match.
CDMA differential mixer output. Requires an external inductor to VCC. Output impedance is
set by an external match.
AMPS mixer output. Requires an external inductor to VCC. Output impedance is set by an
external match.
PCS differential mixer output. Requires an external inductor to VCC. Output impedance is
set by an external match.
PCS differential mixer output. Requires an external inductor to VCC. Output impedance is
set by an external match.
Low frequency bypass for the PCS mixer.
The local oscillator input for the PCS band.
The local oscillator input for the cellular band.
PCS mixer input.
Voltage supply pin for the mixers. An RF bypass capacitor should be connected from this pin
to ground. It should be connected as close to the device as possible with very short trace
lengths.
Cellular mixer input.
The parallel LC circuit is tuned to the cellular IF frequency.
Add inductance from the pin to ground to lower mixer gain and increase IIP3.
No connection
This pin sets the PCS RF bias current. Typically, a 180 Ω resistor is connected from the pin
to ground.
Ground
Cellular band LNA output. This is an open collector output. An inductor must be connected to
VCC. The matching is done externally to the chip.
101251A
Conexant Systems, Inc.
5
August 24, 2000
Share Link: 