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FSK/FM/ASK Transceiver. TH7120 Datasheet |
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TH7120
300 to 930MHz
FSK/FM/ASK Transceiver
Features
! Single chip solution with only a few external components
! Stand-alone fixed-frequency transceiver operation modes
! Programmable multi-channel transceiver operation modes
! Low current consumption in active mode and very low standby current
! PLL-stabilized RF VCO (LO) with internal varactor diode
! Lock detection in programmable channel applications
! 3wire bus serial control interface
! FSK/ASK modulation selection
! FSK for digital data and FM for analog signal reception
! RSSI allows signal strength indication and ASK detection
! Switchable LNA gain for improved dynamic range
! Automatic PA turn-on after PLL lock
! FM possible with external varactor
! ASK modulation achieved by on/off keying
! AFC option for extended input frequency acceptance range
! Surface mount package LQFP32
RYOrdering Information
APart No. (Engineering Samples)
INTH7120 (TH7120-03)
Temperature Code
E (-40 °C to 85 °C)
Package Code
NE (LQFP32)
ELIMApplication Examples
! General bi-directional half duplex digital data transmission or analog signal transmission
R! Low-power telemetry
P! Alarm and security systems
! Keyless car and central locking
! Domotics
! Model control
Technical Data Overview
! Frequency range: 300 MHz to 930 MHz for programmable channel applications
! 315 MHz, 433 MHz, 868 MHz or 915 MHz fixed-frequency single-channel variants
! Power supply range: 2.5 V to 5.5 V
! Temperature range: -40 °C to +85 °C
! Standby current: 50 nA
! Operating current: 6.0 mA in receive mode at low gain
! Operating current 9.0 mA in transmit mode at 0 dBm output power
! Adjustable output power range from –15 dBm to +6 dBm
! Sensitivity: -103 dBm at FSK with 150 kHz IF filter BW
! Sensitivity: -105 dBm at ASK with 150 kHz IF filter BW
! Maximum data rate for FSK and ASK: 60 kbit/s NRZ
! Maximum input level: –10 dBm at FSK and -20 dBm at ASK
! Input frequency acceptance: ± 50 kHz (with AFC option)
! Frequency deviation range: ±5 kHz to ±100 kHz
! Maximum analog modulation frequency: 20 kHz
! 3 MHz to 12 MHz crystal reference
3901007120
Rev. 005
Page 1 of 28
Data Sheet
Jan. 2002
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TH7120
300 to 930MHz
FSK/FM/ASK Transceiver
General Description
The TH7120 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 ISM,
SRD or any other application operating in the frequency ranging of 300 MHz to 930 MHz.
The TH7120 transceiver IC consists of the following building blocks:
" Low-noise amplifier (LNA) for high-sensitivity RF signal reception with switchable gain
" Mixer (MIX) for RF-to-IF down-conversion
" IF amplifier (IFA) to amplify and limit the IF signal and for RSSI generation
" Phase-coincidence demodulator with external ceramic discriminator (FSK Demodulator)
" Operational amplifier, connected to demodulator output (OA1)
" Operational amplifier, integrator circuit at FSK-AFC mode (OA2)
" Control logic with 3wire bus serial control interface (SCI)
" Reference oscillator (RO) with external crystal
" Reference divider (R counter)
Y" Programmable divider (N/A counter)
R" Phase-frequency detector (PFD)
" Charge pump (CP)
A" Voltage control oscillator (VCO) with internal varactor
" Power amplifier (PA) with adjustable output power
INThe transceiver can be used either as a 3wire-bus-controlled programmable or as a stand-alone fixed-
IMfrequency device. After power up, the transceiver is set to fixed-frequency mode. In this mode, pins
FS0/SDEN and FS1/LD must be connected to VEE or VCC in order to set the desired frequency of operation.
LThe logic levels at pins FS0/SDEN and FS1/LD must not be changed after power up in order to remain in
fixed-frequency mode.
EChannel frequency
PRFS0/SDEN
433.92 MHz
1
868.3 MHz
0
315.0 MHz
1
915.0 MHz
0
FS1/LD
0011
After the first logic level change at pin FS0/SDEN, the transceiver enters into programmable mode while pin
FS1/LD is now a PLL lock detector output. In this mode, the user can set any PLL frequency or mode of op-
eration by the SCI.
In the fixed-frequency mode, the user can set the transceiver to Standby, Receive, Transmit or Idle (only PLL
synthesizer active) mode via control pins RE/SCLK and TE/SDTA.
Operation mode
RE/SCLK
TE/SDTA
Standby
0
0
Receive
1
0
Transmit
0
1
Idle
1
1
3901007120
Rev. 005
Page 2 of 28
Data Sheet
Jan. 2002
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Block Diagram
TH7120
300 to 930MHz
FSK/FM/ASK Transceiver
SCLK
SDTA
SDEN
VCC_DIG
VEE_DIG
FS0/SDEN
TE/SDTA
RE/SCLK
ASK/FSK
IN_DTA
IMINARYVCC_IF
LIN_IFA
EVEE_IF
PROUT_MIX1
VEE_RO
FS1/LD
FSK_SW
IN_MIX
OUT_LNA
GAIN_LNA
VEE_LNA
Figure 1: TH7120 block diagram
3901007120
Rev. 005
Page 3 of 28
Data Sheet
Jan. 2002
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