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PIN ASSIGNMENTS
MODULE DESCRIPTION
The TXM-***-ES module is a single-channel transmitter designed for the wireless
transfer of digital or analog information over distances of up to 1,000 feet
1
2
PDN
LADJ
ANT
GND
10
9
outdoors and up to 500 feet indoors. It is based on a high-performance
synthesized architecture. FM / FSK modulation is utilized to provide superior
performance and noise immunity over AM-based solutions. The ES Series is
3
VCC LO_V_D
8
incredibly compact and cost-effective when compared with other FM / FSK
4
5
GND
DATA
/CLK SE
/CLK
7
6
devices. Best of all, it is packed with many useful features and capabilities that
offer a great deal of application flexibility to the designer. Some of these features,
which will be discussed in depth in this data guide, are:
/CLK Output (use for an external micro-controller)
Figure 7: ES Series Transmitter Pinout (Top View)
LO_V_DET (low-voltage detection)
LADJ
(adjust the RF output power)
PIN DESCRIPTIONS
The ES Series is offered in the 902-928MHz band, which is free from the legal
restrictions of the lower 260-470MHz band. This gives the designer much more
Pin #
Name
Description
freedom in the types of applications that can be designed. The 869.85MHz
version allows for the same freedom of design in European applications.
Power Down. Pulling this line low will place the transmitter
1
PDN
into a low-current state. The module will not be able to
transmit a signal in this state.
Precision
Crystal
PLL Frequency
RF Amplifier
LC
Antenna Port
Level Adjust. This line can be used to adjust the output
Data In
Synthesizer
Filter
2
LADJ
power level of the transmitter. Connecting to Vcc will give
the highest output, while placing a resistor to GND will
lower the output level (see Figure 4 on Page 3).
/CLK SEL
Frequency Divider
256 / 1,024
/CLK Output
3
4
5
6
7
V CC
GND
DATA
/CLK
/CLK SEL
Supply Voltage
Analog Ground
Analog or Digital Data Input
Divided Clock Output
Clock Frequency Selection. Logic low selects divide by
256, logic high selects divide by 1,024.
Figure 8: ES Series Transmitter Block Diagram
THEORY OF OPERATION
The ES Series FM / FSK transmitter is capable of generating 1mW of output
power into a 50-ohm load while suppressing harmonics and spurious emissions
to within legal limits. The transmitter is comprised of a VCO and a crystal-
controlled frequency synthesizer. The frequency synthesizer, referenced to a
precision crystal, locks the VCO to achieve a high-Q, low phase-noise oscillator.
The transmitter operates by directly modulating the crystal with the baseband
8
9
10
LO_V_D
GND
ANT
Low Voltage Detect. This line goes low when V CC is less
than 2.15V.
Analog Ground
50-ohm RF Output
signal present on the DATA line. Pulling the crystal in this manner achieves the
desired deviation and linearity. If the transmitter’s VCO were modulated, the
frequency synthesizer would track out much of the deviation within the
bandwidth of the loop filter (this is a common limitation of most synthesized FM
transmitters). The carrier is then amplified and filtered before being output on the
50-ohm ANT line.
The frequency of the Divided Clock output is determined by the state of the Clock
Frequeny Selection line. A low on the Select line will generate a signal on the
clock output that is the center frequency divided by 256, a high will be the center
frequency divided by 1,024.
Page 4
Page 5
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