Complies with Directive 2002/95/EC (RoHS)
I. Product Overview
TXC100 is a rugged, single chip OOK/ASK/FSK Transmitter
IC in the 300-450 MHz frequency range. This chip is highly
integrated and has all required RF functions including a
complete PLL circuit and power amplifier, thus requiring very
few external components. The TXC100 is feature rich and is
very small in size with high output power and low current
consumption and is ideal for various short range wireless
applications in the industrial, automotive and consumer
markets.
3x3mm package
II. Key Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Operating Frequency Range: 300-450 MHz
Modulation Types: OOK/ASK/FSK
Operation supply voltage: 2.1V - 3.6V
High Date rate:
ASK: 100 kbps
FSK: 20 kbps
Low current consumption:
ASK mode: 7 mA typical
FSK mode: 10 mA typical
Low Stand by current: < 1 nA
Adjustable Output power: -10dBm to +10dBm
Adjustable FSK Shift
Programmable Clock Output
Very Low external component count
Extended temperature range: -40°C to +125°C.
Small Package: 3X3 mm 16-pin TQFN package
Standard 13 inch reel, 2500 pieces
Electrical Characteristics
Characteristics
Operating Frequency
Modulation Types
ASK Data Rate
FSK Data Rate
Peak RF Output Power
Standby Current
Supply Voltage Range
Operating Temperature
V
DD
Ta
2.1
-40
10
1
3.6
+125
Sym
fo
Min
300
OOK/ASK/
FSK
100
20
Kbps
Kbps
dBm
nA
Vdc
o
Typical
Max
450
Units
MHz
C
Crystal Parameters
Characteristics
Crystal Frequency
Load Capacitance
Tolerance
Sym
fc
Cl
Tol
30
Min
Typical
fo/32
10
Max
Units
MHz
pF
ppm
III. Popular applications
Active RFID tags
Automated Meter reading
Wireless sensor nodes
Home Automation
Security systems
Tire pressure monitoring
Remote keyless entry
Automobile Immobilizers
Sports & Performance monitoring
Wireless Toys
Medical equipment
Command & Control systems
RF Monolithics, Inc.
4441 Sigma Road
Dallas, Texas 75244
(800) 704-6079 toll-free in U.S. and Canada
www.rfm.com
Email: info@rfm.com
1 of 11
IV. TXC100 Block Diagram and Typical Application Circuit
D0 D1 D2
11 12
13
Mode TX Data
Input
Input
VDD PA
2
3
6
RF
Control
C
5
C
6
C
7
Modulation
Control
C
4
C
1
XTAL1 14
REF
EXT
/XTAL2
C
2
15
C
3
XTAL
DRV
LOGIC
Mode Select
(ASK / FSK)
Shape
7
R
1
C
8
Mixer
Filter
OSC
PA
8
C
10
L
1
PA
Output
C
9
CLK0
CLK1
L
2
C
11
C
12
9
10
/N
/32
5
CLK
BIAS
1
C
13
V
CC
C
14
C
15
C
16
PIN 4 ENABLE INPUT
PIN 16 GND
Table 1:
Component Values for Typical Application Circuit
315MHz Band
C1
C2
C3
3
C4
3
C5
C6
C7
C8
C9
C10¹
C11¹
C12¹
C13
C14
C15
C16¹
L1¹²
L2¹²
X1
100pF
100pF
DNP
DNP
1uF
.01uF
220pF
100pF
680pF
15pF
22pF
15pF
1uF
.01uF
220pF
2.2pF
27nH
22nH
9.84375MHz
433MHz Band
100pF
100pF
DNP
DNP
1uF
.01uF
220pF
100pF
680pF
6.8pF
1pF
6.8pF
1uF
.01uF
220pF
1pF
22nH
18nH
13.5600MHZ
¹Matched to 50 Ohms
²Use wirewound inductors ONLY
3
Use for External Reference Input
DNP - Do Not Populate
2 of 11
V. Pin Configuration
BOTTOM VIEW
Xtal2/REF
IN
3x3mm
Dev2
Xtal1
13
Dev1
Dev0
Clk1
Clk0
12
11
10
9
8
PA
Out
14
15
16
1
2
3
4
V
DD
Mode
Sel
Data
IN
Stdby
7
ES
Out
6
V
DDPA
VI. Pin Description
Pin
1
Name
V
DD
Description
V
DD
is the supply voltage for the PLL and Logic. Bypass as close as possible to pin with 1µF, .01µF, 220pf.
Mode Select enables the chip to be set in ASK or FSK mode
Low: ASK mode
High: FSK mode
ASK, FSK Mode Selection
The Mode Select pin (2) sets the transmit mode of the device. A logic low sets the mode to ASK modulation. A logic high sets the device
to FSK modulation.
2
Mode
Sel
In ASK mode, data driven onto the Data
IN
pin (3) gates the internal power amplifier. A data “High” turns the power amplifier on and thus
drives the RF signal to the antenna. A data “Low” turns off the power amplifier.
In FSK mode, data driven onto the Data
IN
pin shifts the carrier frequency by the amount programmed through the DEV[2..0] pins
(13,12,11). A data “Low” performs no shift. The frequency of a data “Low” in FSK mode is the same frequency of a data “High” in ASK
mode. The FSK deviation is achieved by pulling the crystal frequency. See
Crystal Reference
section (pin 15) for more details. The
maximum deviation for the 315MHz band and 433MHz band is approximately 55 kHz and 80 kHz, respectively.
Data Input enables the turning on and off of the Power Amplifier in ASK mode and selection of high or low frequency in FSK mode.
Low (ASK mode): Power Amplifier off
High (ASK mode): Power Amplifier on
Low (FSK mode): Low frequency
High (FSK mode): High frequency
Standby enables selection of low power shutdown/standby mode
Low or if left unconnected: Sets device in Standby mode
High: Sets device in Ready for transmission mode
4
Stdby
Note: Lowest current consumption achieved when all config pins at Logic Low.
Standby Mode
The Standby pin (4) sets the device in low power shutdown, pulling only 0.2nA. When the device is brought out of standby with a logic
“High”, it is ready for operation within 200us. The Standby pin has an internal pull-down resistor so this pin can be pulled low or left
unconnected. The 200us turn-on time is due to crystal start-up. An optimally matched crystal will minimize this turn-on time. See
Crystal
Reference
section (pin 15) for details on crystal load matching.
3
Data
IN
Clk
Out
GND
5
3 of 11
Clock output is a buffered version of the crystal frequency which may be used to drive external logic or a microprocessor. The frequency
is programmable thru pins 9 (Clk0) and 10(Clk1) as below:
Clk0
0
1
0
1
Clk1
0
0
1
1
Clk
Out
0
fc/4
fc/8
fc/16
5
Clk
Out
NB: fc = (Crystal Frequency)
6
V
DDPA
Supply voltage for the Power amp.
Bypass as close as possible to the pin with a .01µF and 220pf capacitor.
Envelope-Shaping Output controls the on/off ramp time of the power amp in ASK mode. This reduces the spectral width of the output
signal when modulated. Placing a small resistor in series with the output, as close as possible to the chip to minimize circuit parasitics,
will enable control of output power. A potentiometer may be used to adjust the output power to the desired level. Bypass as close to the
pin as possible with a 680pF and 220pF capacitor.
7
ES
Out
Note: By using the ES
OUT
pin there is approx a 0.6dB drop in max output power.
Spectral Shaping/Output Power Adjust
The ES
OUT
pin (7) can serve a dual function. Use of the ES
OUT
pin will allow for a softer turn-on/turn-off of the power amplifier resulting in
reduced spectral spreading of the ASK signal. Inserting a series resistor between the ES
OUT
pin and the pull-up inductor will allow for
adjustment of the carrier output power. Typically a resistance of 5K Ohms or less will allow adjustment down to -10dBm.
The envelope-shaping resistor allows for a turn on / turn-off of the Power Amp in ASK mode.
Power-Amplifier Output. - Requires a DC path to the supply voltage, thru a series inductor which can be part of the output matching
network to an antenna
8
PA
Out
Power Amplifier
The power amp is an open-drain, Class C amplifier with optimal impedance at PA
OUT
(pin 8) of about 250 Ohms. A matching network can
optimize the output to drive typical 50 Ohm antennas. An output matching network with component values is shown in the
Typical
Application Circuit
(section IV). Additionally, the matching network aids in suppressing carrier harmonics to aid in compliance testing.
See description for Pin 5
Frequency Deviation configuration pins set the amount of deviation desired between data logic states in FSK mode. Frequency deviation
is programmable through pins 13, 12, 11 as below:
DEV
∆
.125 x max
.250 x max
.375 x max
.500 x max
.625 x max
.750 x max
.875 x max
max
DEV 2
0
0
0
0
1
1
1
1
DEV 1
0
0
1
1
0
0
1
1
DEV 0
0
1
0
1
0
1
0
1
10, 9
Clk[1..0]
13, 12, 11
FreqDev[2..0]
Note: Deviation values are approx for properly loaded crystal. Crystal characteristics and loading will differ with other manufacturers.
14
Xtal1
External Crystal input 1 presents a capacitance of 3pF to GND in ASK and FSK(Data
IN
=0V) mode. Additional circuit parasitics add to the
package capacitance which increases the presented load to about 4.5pF.
External Crystal input 2 presents a capacitance of 3pF to GND in ASK and FSK(Data
IN
=0V) mode. Additional circuit parasitics add to the
package capacitance which increases the presented load to about 4.5pF.
External Ref Input enables a custom frequency to be applied to obtain the desired transmit frequency. Unconnected Xtal1 input must be
bypassed with a .01µF capacitor and additional .01µF series capacitance should be added into External Reference input.
Crystal Reference
The crystal drive circuit in the TXC100 is designed to present a 3pF load to GND to the reference crystal. Including PCB parasitic
capacitances, this increases to about 4.5pF. In ASK mode, the full 3pF load is applied to the crystal allowing it to oscillate at the desired
frequency. In FSK mode, a portion of the 3pF load is removed in response to a data logic “High” applied to the Data
IN
(pin 2) and the
programmed frequency deviation pins DEV[0..2] (13,12,11). For larger frequency deviations use a crystal with larger motional
capacitance or reduce PCB parasitic capacitance as much as possible.
NOTE: Use a crystal with the same load capacitance as that presented by the TXC100. If not, additional matching will be
necessary to achieve the desired carrier frequency and the added matching will reduce the desired FSK deviation.
Ground. Connect to system ground.
16
GND
Note: The exposed ground pad is the power amp ground. It must be connected to system ground thru a low inductance path.
15
Xtal2/REF
IN
4 of 11
VII. Absolute Maximum Ratings
Parameter
Symbol
Min
Operating Temperature
Junction Temperature
Storage Temperature
Supply Voltage – Vdd to GND
All pins to GND
T
O
T
J
T
S
V
S
-40
-40
-60
-0.3
-0.3
Limit Values
Max
+125
+150
+150
+4
Vdd + 0.3
°C
°C
°C
V
V
Unit
Note:
Maximum ratings must not be exceeded under any circumstances and can cause permanent damage to the IC
VIII. DC Electrical Characteristic
(Typical values taken at V
DD
= +3.0V, T
A
= +25°C, unless otherwise noted)
Limit Values
Characteristic
Supply Voltage
Current Consumption
0.2
Standby
I
STDBY
120
700
2.9
7
Supply
I
DD
1,4
10.5
3.3
7.3
10
Digital Inputs
Data Input Low
Data Input High
Max Input Current
Digital Outputs
Output Voltage Low
Output Voltage High
V
OL
V
OH
V
DD
-0.25
0.25
V
V
Clkout, Load = 10pF
Clkout, Load = 10pF
V
IL
V
IH
I
I
V
DD
-0.25
15.5
20
0.25
V
V
µa
1
300
1600
4.3
10.7
17.1
4.8
11.4
18.1
mA
nA
T
A
= +25 deg C
T
A
= +85 deg C
T
A
= +125 deg C
PA off, Data=0V (ASK)
50% duty cycle (ASK)
Data=+V
DD
(FSK and ASK)
PA off, Data=0V (ASK)
50% duty cycle (ASK)
Data=+V
DD
(FSK and ASK)
433 Mhz Band
315 Mhz Band
Sym
V
DD
Notes
min
2.1
typ
max
3.6
V
Unit
Test Conditions
5 of 11
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
