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參數(shù)資料
| 型號： | RF9006 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 88K |
| 代理商： | RF9006 |
8-116
RF9906
Rev C5 000822
8
F
NOT FOR NEWDESIGNS
ground plane.
13
LO IN+
Mixer LO Balanced Input Pin. This pin is internally DC biased and
should be DC blocked if connected to a device with DC present. For
single-ended input operation, one pin is used as an input and the other
mixer LO input is AC coupled to ground. The single-ended input imped-
ance is 50
.
14
LO IN-
Same as pin 13, except complementary input.
SeeUpgradedProductsRF2449& RF2461
Pin
1
Function
VCC1
Description
Supply voltage for the LNA. External RF and IF bypassing is required.
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.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
RF input pin. This pin is internally DC blocked and matched to 50
.
Interface Schematic
2
GND
3
LNA IN
4
5
GND
IF2
Same as pin 2.
FM IF output pin. This is a single-ended output with an output imped-
ance set by an internal 850
resistor to V
CC
. The resistor sets the
operating impedance, but an external choke or matching inductor to
V
CC
must be supplied in order to correctly bias this output. This induc-
tor is typically incorporated in the matching network between the output
and IF filter. Because this pin is biased to V
CC
, a DC blocking capacitor
must be used if the IF filter input has a DC path to ground.
6
7
GND
Same as pin 2.
IF SELECT
Selects which IF output (IF1 or IF2) is used. This is a digitally controlled
input. A logic "high" selects IF1. A logic "low" selects IF2. The threshold
voltage is approximately 1.3V.
8
9
GND
IF 1+
Same as pin 2.
CDMA IF output pin. This is a balanced output. The output impedance
is set by an internal 500
resistor to V
CC
. Thus the output impedance
of each pin is 500
, whereas the differential output impedance is
1000
. The resistor sets the operating impedance, but an external
choke or matching inductor to V
CC
must be supplied in order to cor-
rectly bias this output. This inductor is typically incorporated in the
matching network between the output and IF filter. Because this pin is
biased to V
CC
, a DC blocking capacitor must be used if the IF filter input
has a DC path to ground.
Same as pin 9 except complementary input.
10
11
IF 1-
GC
See pin 9.
Analog gain adjustment for both IF output buffer amplifiers. A 10k
source impedance is required for proper operation of the gain control
circuitry. Valid control voltages, on the source side of the 10k
resistor,
are from 0V to 2.9V. Minimum gain is selected with 2.4V to 2.9V. Maxi-
mum gain is selected with 0V to 0.2V. When operating the RF9906 at
fixed maximum gain, this pin should be grounded through a 10k
resistor. Do not connect this pin directly to ground (see Application
Schematic for example).
Supply Voltage for the Mixer, LO Buffer Amplifier, and IF Buffer Amplifi-
ers. External RF and IF bypassing is required. The trace length
between the pin and the bypass capacitors should be minimized. The
12
VCC2
See pin 13.
LNA OUT
V
CC1
IF2
850
V
CC
IF
SELECT
30 k
IF1+
500
V
CC2
500
IF1-
LO IN-
LO IN+
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