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参数资料
| 型号： | DR-TXC100-433 |
| 厂商： | RFM |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 433MHZ TXC100 |
| 标准包装： | 1 |
| 类型： | 发射器，ASK，FSK |
| 频率： | 433.92MHz |
| 适用于相关产品： | TXC100 |
| 已供物品： | 板 |
The clock output is a scaled and buffered version of the crystal frequency, which may be used to drive external logic or a microprocessor.
The frequency is programmable through Pins 9 (Clk0) and 10(Clk1) as below:
Clk0
Clk1
Clk Out
5
Clk Out
0
1
0
1
0
0
1
1
0
fc/4
fc/8
fc/16
fc = Crystal Frequency
6
7
8
10, 9
V DDPA
ES Out
PA Out
Clk[1..0]
This pin is a power supply voltage source for the transmitter power amplifier. Bypass this pin as close as possible with a 0.01 μF and 220
pF capacitor. ES Out is the alternate power amplifier voltage source as discussed below.
This pin can be used to supply voltage to the power amplifier instead of V DDPA , allowing the on/off rise and fall times of the power amplifier
to be adjusted in ASK mode. Reducing the rise and fall times reduces the spectral bandwidth of the modulated output signal, and also
reduces average transmitter power. Rise and fall times are adjusted by placing a resistor in the range of 1K to 5K in series with this
output, as close as possible to the TXC100 IC to minimize circuit parasitics. The power amplifier side of the resistor should be bypassed
with 680 pF and 220 pF capacitors in parallel, as close to the resistor as possible.
Power Amplifier - the power amplifier is an open-drain, Class C amplifier designed for a load impedance at PA OUT (pin 8) of about 250
ohms. The power amplifier requires a DC path to the supply voltage through a series inductor, which can be part of the output matching
network. A 50 ohm antenna matching network is shown in the Typical Application Circuit section. The matching network also suppresses
carrier harmonics to aid in compliance testing.
See description for Pin 5
The Frequency Deviation Pins set the amount of deviation between data logic states in FSK mode. Frequency deviation is programmable
through pins 11, 12, 13 as shown in the table below:
DEV ?
.125 x Max
.250 x Max
DEV 2
0
0
DEV 1
0
0
DEV 0
0
1
13, 12, 11
FreqDev[2..0]
.375 x Max
.500 x Max
.625 x Max
.750 x Max
.875 x Max
Max
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
Deviation values are approximate and apply to a properly loaded crystal. Crystal characteristics and loading behavior can vary between
suppliers.
14
15
16
Xtal1
Xtal2/REF IN
GND
External Crystal Input 1 presents a capacitance of 3 pF to GND in ASK and FSK (Data IN logic low) modes. Circuit parasitics add to this
package capacitance, presenting a total load of about 4.5 pF.
External Crystal Input 2 presents a capacitance of 3 pF to GND in ASK and FSK(Data IN logic low) mode. Circuit parasitics add to this
package capacitance, presenting a total load of about 4.5 pF.
The External Ref Input allows an external frequency source to be used to obtain the desired transmit frequency. In this case, the Xtal1
input must be bypassed with a 0.01μF capacitor, and a 0.01μF series capacitance should be added into External Reference input.
Crystal Reference - the Xtal1 and Xtal2 inputs are designed to present a 3 pF load to GND to each reference crystal connection.
Including PCB parasitic capacitances, this increases to about 4.5 pFat each connection. In ASK mode, the full 3 pF load is applied to the
crystal allowing it to oscillate at the desired frequency. In FSK mode, a portion of the 3 pF load is removed in response to a logic high
being applied to the Data IN (pin 2) as set by the frequency deviation pins DEV[0..2] (11,12,13). To achieve larger frequency deviations,
use a crystal with large motional capacitance or reduce PCB parasitic capacitance to the extent possible.
Connect to system ground.
Note: The ground pad in the middle of the package is the power amplifier ground. It must be connected to system ground thru a low
inductance path.
www.RFM.com Email: info@rfm.com
?RF Monolithics, Inc.
Page 4 of 11
TXC100 - 08/18/10
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