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PDF SYN470R Data sheet ( Hoja de datos )
| Número de pieza | SYN470R | |
| Descripción | 300-450MHz ASK Receiver | |
| Fabricantes | Synoxo | |
| Logotipo |  |
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 1. Datasheet - 300-450MHz ASK Receiver  Hay una vista previa y un enlace de descarga de SYN470R (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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SYN470R Datasheet
(300-450MHz ASK Receiver)
Version 1.0
1 page  
SYN470R/SYN480R
6. Pin Configuration
SEL0
VSSRF
VSSRF
ANT
VDDRF
VDDBB
CTH
NC
SWEN
REFOSC
SEL1
CAGC
WAKEB
SHUT
DO
VSSBB
VSSRF
ANT
VDDRF
CTH
REFOSC
CAGC
SHUT/WAKEB
DO
Standard 16-Pin or 8-Pin SOP (M) Packages
7. 8-Pin Options
The standard 16-pin package allows complete control of all configurable features. Some reduced
function 8-pin versions are also available.
For high-volume applications additional customized 8-pin devices can be produced. SWEN, SEL0
and SEL1 pins are internally bonded to reduce the pin count. Pin 6 may be configured as either
SHUT or WAKEB.
SEL0
1
0
1
0
SEL1
1
1
0
0
Demodulator Bandwidth
Sweep Mode
Fixed Mode
5000 Hz
10000Hz
2500 Hz
5000Hz
1250 Hz
2500 Hz
625 Hz
1250 Hz
Table 1. Nominal Demodulator Filter Bandwidth vs. SEL0, SEL1 and Operating Mode
*This specification is subject to change without notification.
-3-
5 Page 
SYN470R/SYN480R
up to ±0.5% without the need to retune the receiver and without impacting system performance.
The swept-LO technique does not affect the IF bandwidth, therefore noise performance is not
degraded relative to fixed mode. The IF bandwidth is 430kHz whether the device is operating in
fixed or sweep-mode.
Due to limitations imposed by the LO sweeping process, the upper limit on data rate in sweep
mode is approximately 5.0kbps.
Similar performance is not currently available with crystal-based superheterodyne receivers which
can operate only with SAW- or crystal-based transmitters.
In sweep-mode, a range reduction will occur in installations where there is a strong interferer in
the swept RF band. This is because the process indiscriminately includes all signals within the
sweep range. An SYN470R may be used in place of a superregenerative receiver in most
applications.
13.1.2. Step 2: Selecting the Reference Oscillator
All timing and tuning operations on the SYN470R are derived from the internal Colpitts reference
oscillator. Timing and tuning is controlled through the REFOSC pin in one of three ways:
1) Connect a ceramic resonator
2) Connect a crystal
3) Drive this pin with an external timing signal
The specific reference frequency required is related to the system transmit frequency and to the
operating mode of the receiver as set by the SWEN pin.
13.1.1.3. Crystal or Ceramic Resonator Selection
Do not use resonators with integral capacitors since capacitors are included in the IC, also care
should be taken to ensure low ESR capacitors are selected.
If operating in fixed-mode, a crystal is recommended. In sweep-mode either a crystal or ceramic
resonator may be used. When a crystal of ceramic resonator is used the minimum voltage is
300mVPP. If using an externally applied signal it should be AC-coupled and limited to the
operating range of 0.1VPP to 1.5VPP.
13.1.1.4. Selecting Reference Oscillator Frequency fT (Fixed Mode)
As with any superheterodyne receiver, the mixing between the internal LO (local oscillator)
frequency fLO and the incoming transmit frequency fTX ideally must equal the IF center frequency.
Equation 1 may be used to compute the appropriate fLO for a given fTX:
(1) fLO =fTX ±(0.86
fTX
315
)
Frequencies fTX and fLO are in MHz. Note that two values of fLO exist for any given fTX,
distinguished as “high-side mixing” and “low-side mixing.” High-side mixing results in an image
frequency above the frequency of interest and low-side mixing results in a frequency below.
*This specification is subject to change without notification.
-9-
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SYN470R.PDF ] | |
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