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參數(shù)資料
| 型號： | KESRX05QP1T |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | 260 to 470MHz ASK Receiver with Power Down |
| 中文描述： | 260至470MHz ASK接收機的斷電 |
| 文件頁數(shù)： | 3/28頁 |
| 文件大?。?/td> | 466K |
| 代理商： | KESRX05QP1T |
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2
KESRX05
Figure 2 Pin connections (top view)
the performance for a wide range of applications and
locations world wide.
T
he KESRX05, with its anti-jamming detector circuit, is
an ideal ASK/ OOK receiver for difficult reception areas
caused by interference such as amateur radio repeater
stations and wireless stereo headphones. Operation is
possible with interfering signals which are more than
20dB stronger than the wanted signal (IF bandwidth =
470kHz.), without the cost penalities of increased IF se-
lectivity and frequency accuracy.
Figure 1 is the system block diagram, with an external
ceramic IF filter, SAW fillter and noise reduction filter.
IFFLT1
IFDC1
IFIN
IFDC2
V
CC
IFOUT
V
CC
RF
MIXIP
RFOP
V
EE
RF
RFIN
AGC
PEAK
DATAOP
IFFLT2
RSSI
DETB
PD
XTAL1
XTAL2
DF0
DF1
DF2
VCO1
VCO2
V
EE
LF
DSN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
KESRX05
DESCRIPTION
The single conversion superheterodyne receiver
approach is now generally considered the way forward
for ISM band type applications because of lower cost,
superior selectivity, lower radiation, and flexibility over
other techniques. For power-conscious, hand-held
applications KESRX05 provides improved performance
and flexibility on a lower 3·0V supply and a power down
feature allows faster switch-on times for use in a pulsed
power saving mode.
Although this is a relatively simple receiver, the flexibility
of using an external IF filter allows the designer to
choose both the selectivity and the IF in order to optimise
Pin
Name
Function
Schematic
1
IFFLT1
Table 1 Pin descriptions
Cont…
IFFLT1
IFFLT2
10k
10k
V
CC
Noise reducing IF filter
A simple LC noise reduction filter (L5 and C7) is
connected between pins 1 (IFFLT1 ) and 28 (IFFLT2)
to reduce the noise contribution from the earlier
stages of the logathrimic amplifier. The LC filter helps
to reduce the bandwidth of the log amplifier from
approximately 45MHz to typically 1MHz, preventing
wideband noise from being detected as a signal. To
reduce the Q of the simple LC circuit, an external
damping resistor in parallel with L5, C7. However,
the preferred method to a damping resistor is to lower
the Q of L5 or increase the tolerances of L5 and C7.
For
IF Amp /RSSI Detector section of the Functional Description.
further
information
refer
to
the
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