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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)： | 4/28頁 |
| 文件大?。?/td> | 466K |
| 代理商： | KESRX05QP1T |
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3
KESRX05
Pin
Name
Function
Schematic
2
3
4
5
6
7
8
IFDC1
IFIN
IFDC2
V
CC
IFOUT
V
CC
RF
MIXIP
Log Amplifier DC Blocking Capacitor
Capacitors C3 and C4 provide DC blocking within
the high gain stage of the log amplifier. The log
amplifier has a small gain of greater than 80dB
between pins 3 (IFIN) and 27 (RSSI output)
Capacitors C3 and C4 eliminate DC offsets, allowing
the amplification of AC signals only.
For further information, refer to the IF Amp/RSSI De-
tector section of the Functional Description.
Log Amp Input (IFamplifier input)
The bandwidth of KESRX05 is set by the external
ceramic filter CF1. Impedance matching from the
output of the ceramic filter to the input of the log
amplifier is achieved by an external shunt resistor
R9 in parallel with an internal resistor.
For further information please refer to the IF Interface
section of the Functional Description.
Log amplifier DC stability capacitor
Positive supply
IF output
The IF output drive is a voltage drive with a low output
impedance of 300
via an internal series resistor.
The IFOUT pin is designed for direct connection to
an external 10·7MHz FM ceramic filter with a typical
input impedance of 300
.
For further information refer to the IF Interface section
of the Functional Description.
Positive supply for RF circuits
Mixer input
To a first order approximation the input impedance
of the mixer at UHF frequencies is set by the internal
bias resistor and capacitor network. Effects of internal
and external stray parasitics ignored.
For further information refer to the AC Electrical
Characteristics.
IFIN
3·1k
950
181k
181k
IFDC
IFDC1
IFDC1
IFIN
3·1k
181k
INTERNAL
R9
FROM
CF1
C3
Matching circuit for CF1
See pin 2
Table 1 Pin descriptions (continued)
Cont…
IFOUT
300
50
μ
A
MIXIP
2k
2p
V
EE
RF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| KESTX0 | 400MHz - 460MHz ASK Transmitter |
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| KESTX01MPAS | 400MHz - 460MHz ASK Transmitter |
| KF139 | SPECIFICATIONS FOR SAW FILTER(BAND PASS FILTERS FOR THE RECEIVING RF CIRCUITS OF PAGER) |
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