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PDF EVB7122 Data sheet ( Hoja de datos )
| Número de pieza | EVB7122 | |
| Descripción | 27 to 930MHz Transceiver Evaluation Board Description | |
| Fabricantes | Melexis Microelectronic Systems | |
| Logotipo |  |
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Features
! Single chip solution with only a few external
components
! Stand-alone fixed-frequency user mode
! Programmable multi-channel user mode
! Low current consumption in active mode and
very low standby current
! PLL-stabilized RF VCO (LO) with internal
www.DataSheet!4U.cvLomaorcakcdtoertedciot doeutput in programmable
user mode
! On-chip AFC for extended input frequency
acceptance range
! FSK for digital data or FM for analog signal
reception
EVB7122
27 to 930MHz Transceiver
Evaluation Board Description
! FSK/ASK mode selection
! RSSI output for signal strength indication and
ASK reception
! ASK detection normal or with peak detector
! Switchable LNA gain for improved dynamic
range
! Automatic PA turn-on after PLL lock
! ASK modulation achieved by PA on/off keying
! 3wire bus serial control interface
! EVB comes with a cable to connect to a PC’s
LPT port
! EVB programming software is available on
Melexis web site
Ordering Information
Part No. (see paragraph 6)
EVB7122-315-FSK-C
EVB7122-433-FSK-C
EVB7122-868-FSK-C
EVB7122-915-FSK-C
Note 1: EVB default population is FSK, ASK modifications according to section 4.2 and 4.3.
Note 2: EVB7122 is applicable for devices TH7122 and TH71221.
Application Examples
! General bi-directional half duplex digital data
RF signaling or analog signal communication
! Tire Pressure Monitoring Systems (TPMS)
! Remote Keyless Entry (RKE)
! Low-power telemetry systems
! Alarm and security systems
! Wireless access control
! Garage door openers
! Networking solutions
! Active RFID tags
! Remote controls
! Home and building automation
Evaluation Board Example
General Description
The TH7122 is a single chip FSK/FM/ASK transceiver IC. It is designed to operate in low-power multi-
channel programmable or single-channel stand-alone, half-duplex data transmission systems. It can be used
for applications in automotive, industrial-scientific-medical (ISM), short range devices (SRD) or similar
applications operating in the frequency range of 300 MHz to 930 MHz. In programmable user mode, the
transceiver can operate down to 27 MHz by employing an external VCO varactor diode.
39012 07122 02
Rev. 005
Page 1 of 24
EVB Description
June/07
1 page  
EVB7122
27 to 930MHz Transceiver
Evaluation Board Description
2 Description of User Modes
2.1 Stand-alone User Mode Operation
After power up the transceiver is set to stand-alone user mode. In this mode, pins FS0/SDEN and FS1/LD
must be connected to VEE or VCC to set the desired frequency of operation. The logic level at pin FS0/SDEN
must not be changed after power up in order to remain in stand-alone user mode. The default settings of the
control word bits in stand-alone user mode are described in the frequency selection table. Detailed
information about the default settings can be found in the tables of section 5.
www.DataSheet4U.com
2.1.1 Frequency Selection
Channel frequency
FS0/SDEN
FS1/LD
Reference oscillator frequency
R counter ratio in RX mode (RR)
PFD frequency in RX mode
N counter ratio in RX mode (NR)
VCO frequency in RX mode
RX frequency
R counter ratio in TX mode (RT)
PFD frequency in TX mode
N counter ratio in TX mode (NT)
VCO frequency in TX mode
TX frequency
IF in RX mode
433.92 MHz
1
0
32
223.45 kHz
1894
423.22 MHz
433.92 MHz
32
223.45 kHz
1942
433.92 MHz
433.92 MHz
10.7 MHz
868.3 MHz
0
0
315 MHz
1
1
7.1505 MHz
16 18
446.91 kHz 397.25 kHz
1919
766
857.60 MHz 304.30 MHz
868.30 MHz 315.00 MHz
16 18
446.91 kHz 397.25 kHz
1943
793
868.30 MHz 315.00 MHz
868.30 MHz 315.00 MHz
10.7 MHz
10.7 MHz
915 MHz
0
1
32
223.45 kHz
4047
904.30 MHz
915.00 MHz
32
223.45 kHz
4095
915.00 MHz
915.00 MHz
10.7 MHz
In stand-alone user mode, the transceiver can be set to Standby, Receive, Transmit or Idle mode (only PLL
synthesizer active) via control pins RE/SCLK and TE/SDTA. The modulation scheme and the LNA gain are
set by pins ASK/FSK and GAIN_LNA, respectively.
2.1.2 Operation Mode
Operation mode
RE/SCLK
TE/SDTA
Note: Pins with internal pull-down
Standby
0
0
Receive
1
0
Transmit
0
1
Idle
1
1
39012 07122 02
Rev. 005
Page 5 of 24
EVB Description
June/07
5 Page 
EVB7122
27 to 930MHz Transceiver
Evaluation Board Description
3.1.4 C – word
Name
NR
BAND
www.DataSheet4U.com
VCOCUR
Bits
[16:0]
[17]
[19:18]
Description
Feedback divider ratio in RX operation mode
64d .. 131071d
Set the desired frequency range
0 recommended at fRF < 500 MHz
1 recommended at fRF > 500MHz
Some tail current sources are linked to this bit in order to save current for low frequency
operations.
VCO active current
00 low current (300 µA)
01 standard current (500 µA)
10 high1 current (700 µA)
11 high2 current (900 µA)
Phase Detector polarity
PFDPOL
LNACTRL
0 negative
[20] #default
1 positive
VCO
OUTPUT
FREQUENCY
pos
neg
VCO INPUT VOLTAGE
LNA gain control mode
0 external LNA gain control
#default
[21]
LNA gain will be set via pin GAIN_LNA.
1 internal LNA gain control
LNA gain will be set via bit LNAGAIN (bit 12 in A-word). Nevertheless pin GAIN_LNA must
be connected to either VCC or VEE.
39012 07122 02
Rev. 005
Page 11 of 24
EVB Description
June/07
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet EVB7122.PDF ] | |
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