ENR1 Datasheet, PDF (3/13 Pages) Radiometrix Ltd – 12.5kHz Channel VHF TX / RX

Functional description: ENT1 transmitter
The ENT1 transmitter consists of a frequency modulated Voltage Controlled Temperature Controlled Crystal
Oscillator (VCTCXO) feeding a frequency multiplier with two stage amplifier and RF filter. Final Power
Amplifier stage is factory pre-set to appropriate band power level. Operation can be controlled by the EN
(Enable) line, the transmitter achieving full RF output typically within 7ms of this line being pulled high. The
RF output is filtered to ensure compliance with the appropriate radio regulations and fed to the 50Ω antenna
pin.
User interface
43mm
5mm
14.5mm
ENT1
pin spacing:
2.54 mm
15.24 mm
123
4 5 67
7 holes of 0.7 mm dia.
pin spacing 2.54 mm
Figure 3: ENT1 pin-out and dimension
1 = RF gnd
2 = RF out
3 = RF gnd
4 = En
5 = Vcc
6 = 0V
7 = TXD
RF GND
(Pins 1 & 3)
RF ground, internally connected to the module screen and pin 6 (0V). These pins should be directly
connected to the RF return path - e.g. coax braid, main PCB ground plane etc.
RF out
(Pin 2)
50Ω RF output to antenna. Internally DC-isolated. See antenna section of applications notes for details of
suitable antennas / feeds.
En
(Pin 4)
Tx enable. 0.15V or open-circuit on this pin disables module (current <1mA), 1.7V enables module. Input
impedance 1M approx. EN pin should not be left floating. Observe slew rate requirements (see applications
note).
Vcc
(Pin 5)
5V DC +ve supply. Max ripple content 0.1Vp-p. Decoupling is not generally required.
0V
(Pin 6)
DC supply ground. Internally connected to pins 1, 3 and module screen.
TXD
(Pin 7)
DC coupled input for 5V CMOS logic. Rin = 100k
Radiometrix Ltd.,
ENT1/ ENR1 data sheet
Page 3