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參數(shù)資料
| 型號： | SSTX4915 |
| 廠商： | Silicon Storage Technology, Inc. |
| 英文描述： | LOW POWER ASK TRANMITTER IC |
| 中文描述： | 低功率ASK TRANMITTER集成電路 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大小： | 556K |
| 代理商： | SSTX4915 |
www.SiliconStandard.com 2 of 9
SSTX4915
Pin Descriptions
Rev.2.0
2
8
/
0
6/2003
Number
Name
Description
1
OSCI
N
This pin is connected directly to the base of the reference oscillator transistor. The
reference oscillator uses a modified Colpitts configuration.
2
OSCOUT
This pin is connected directly to the emitter of the reference oscillator transistor.
3
T
X
EN
Transmitter enable control (TXEN = low = power down mode;
TXEN = high = normal operation mode).
4
VSS
Ground
connection
for
the
transmit
output
amplifier.
5
TXOUT
Transmitter
output.
This
pin
is
an
open
collector
and
requires
a
pull-up
inductor
for
bias/matching
and
a
tapped
capacitor
for
matching.
6
VSS1
Ground
connection
for
the
transmit
driver
amplifier.
7
VCC1
Nominal
supply
voltage
for
the
transmit
driver
amplifier.
8
MODIN
ASK
modulation
input.
An
external
resistor
R
MODIN
to
supply
voltage
is
used
to
bias
the
entire
transmit
amplifier
chain
through
this
pin.
9
VCC2
Nominal
supply
voltage
for
the
VCO
and
PLL
circuitry.
10
VSS2
Ground
connection
for
the
PLL
circuitry.
11
NC
No
connection.
12
RES
Differential
open
collector
VCO
outputs.
13
RES
14
DO
Output
of
the
charge
pump.
An
R-C
network
from
this
pin
to
ground
is
used
to
establish
the
PLL
bandwidth.
15
LD
Lock
detector
output.
This
pin
is
used
to
set
the
threshold
of
the
lock
detect
circuitry
which
enables
or
disables
the
transmit
amplifier.
A
shunt
capacitor
should
be
used
to
set
an
R-C
time
constant
with
the
on-chip
series
1k
resistor.
The
time
constant
should
be
set
to
approximately
15
times
the
reference
period.
16
SW
Prescaler
modulus
control
input
(SW
=
high
=
÷
64;
SW
=
low
=
÷
128).
OSCIN
OSCOUT
TXEN
VSS
TXOUT
VSS1
VCC1
MODIN
SW
LD
DO
RES
RESB
VREFP
VSS2
VCC2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S
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