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參數(shù)資料
| 型號(hào)： | RF2489 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | DUAL-BAND/TRI-MODE CDMA LOW NOISE AMPLIFIER/MIXER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, QFN-32 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 490K |
| 代理商： | RF2489 |
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Preliminary
8-42
RF2489
Rev A10 011017
8
F
Pin
16
17
Function
GND
PCS LNA
OUT
Description
Low-inductance ground required.
Interface Schematic
PCS LNA output. Small external inductance required for best imped-
ance match to 50
.
18
19
20
VCC2
GND
PCS LNA VCC connection. A series inductance required for matching.
Low-inductance ground required.
PCS LNA IN
PCS LNA input. Simple external matching required for best perfor-
mance.
Low-inductance ground required.
See pin 17.
21
22
GND
CELL LNA
IN
Cellular LNA input. Simple external matching required for best perfor-
mance.
23
CELL LNA
EMITTER
CELL LNA
OUT
ISET1
Cellular LNA emitter. A small inductor connects this pin to ground. Cel-
lular LNA gain can be adjusted by the inductance.
See pin 22.
24
Cellular LNA output. Simple external L-C matching required.
See pin 22.
25
Resistor to ground sets both LNA and mixer currents. Lower resistance
results in lower currents for both the LNA and mixer.
Resistor to ground sets LNA current. Higher resistance results in lower
current.
Low-inductance ground required.
26
ISET2
27
28
GND
CELL MIX
IN
Cellular mixer RF single-end input. External L-C network required for
best performance.
29
VCC1
VCC for internal references, logic, and mixer preamplifiers. Internal RF
bypass capacitor. External bypass capacitor between 1nF and 47nF
required.
Logic input. High level selects PCS band; low level selects cellular
band. The LO divider circuitry is disabled when BAND SEL is high,
regardless of the state of pin 5 (/2 SELECT). When BAND SEL is low,
pin 5 can be selected high or low. If using a single LO input, pin 5 can
be tied to a high state allowing BAND SEL to control the LO divider
function.
Logic input. High selects external LNA current reference set by the
resistor connected from ISET2 to ground.
30
BAND SEL
31
IP SET
32
IF SEL
Logic input. High selects FM IF outputs; low selects CDMA IF outputs.
PCS LNA IN
V
CC
PCS LNA OUT
CELL LNA IN
V
CC
CELL LNA OUT
CELL LNA EMITTER
CELL MIX IN
BAND SEL
IP SET
IF SEL
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