MAX1479ATE+C2R [MAXIM]
Telecom Circuit,;
| 型号： | MAX1479ATE+C2R |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Telecom Circuit, 电信 电信集成电路 |
| 文件： | 总10页 (文件大小：557K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
General Description
Features
● ETSI-Compliant EN300 220
The MAX1479 crystal-referenced phase-locked-loop
(PLL) VHF/UHF transmitter is designed to transmit ASK,
OOK, and FSK data in the 300MHz to 450MHz frequency
range. The MAX1479 supports data rates up to 100kbps
in ASK mode and 20kbps in FSK mode (both Manchester
coded). The device provides an adjustable output power
of more than +10dBm into a 50Ω load. The crystal-based
architecture of the MAX1479 eliminates many of the com-
mon problems of SAW-based transmitters by providing
greater modulation depth, faster frequency settling, higher
tolerance of the transmit frequency, and reduced tem-
perature dependence. These improvements enable better
overall receiver performance when using the MAX1479
together with a superheterodyne receiver such as the
MAX1470, MAX1471, MAX1473, or MAX7033.
● +2.1V to +3.6V Single-Supply Operation
● Supports ASK, OOK, and FSK Modulations
● Adjustable FSK Shift
● +10dBm Output Power into 50Ω Load
● Low Supply Current (6.7mA in ASK Mode,
and 10.5mA in FSK Mode)
● Uses Small Low-Cost Crystal
● Small 16-Pin TQFN Package
● Fast-On Oscillator—200μs Startup Time
● Programmable Clock Output
The MAX1479 is available in a 16-pin TQFN package
(3mm x 3mm) and is specified for the automotive tem-
perature range from -40°C to +125°C.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
Applications
● Remote Keyless Entry
● Tire Pressure Monitoring
● Security Systems
MAX1479ATE+
-40°C to +125°C
16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
● Radio-Controlled Toys
● Wireless Game Consoles
● Wireless Computer Peripherals
● Wireless Sensors
Typical Application Circuit appears at end of data sheet.
● RF Remote Controls
● Garage Door Openers
Pin Configuration
TOP VIEW
Functional Diagram
16
15
14
13
16 15 14 13
CRYSTAL
DRIVER
V
1
2
3
4
DEVIATION
12
11
DEV1
DEV0
DD
V
1
2
3
4
12 DEV1
11 DEV0
10 CLK1
DD
LOOP
FILTER
MAX1479
PD/CP
MODE
DIN
MODE
EP*
ASK
FSK
DIVIDE
BY 32
VCO
PA
ENABLE
9
CLK0
10 CLK1
DIN
5
6
7
8
MAX1479
CLOCK
DIVIDER
ENVELOPE
SHAPING
ENABLE
9
CLK0
TQFN
(3mm x 3mm)
*CONNECT EP TO GND.
5
6
7
8
19-3353; Rev 2; 2/15
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Absolute Maximum Ratings
V
to GND ............................................................-0.3V to +4V
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DD
All Other Pins to GND.............................. -0.3V to (V
+ 0.3V)
DD
Continuous Power Dissipation (T = +70°C)
A
16-Pin TQFN (derate 14.7mW/°C above +70°C)...1176.5mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
DC Electrical Characteristics
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, V
= 2.1V to 3.6V, V
= V . T = -40°C to
ENABLE DD A
DD
+125°C, unless otherwise noted. Min and Max values are 100% tested at T = +125°C and are guaranteed by design and character-
A
ization over temperature, unless otherwise noted. Typical values are at V
= +2.7V, T = +25°C, unless otherwise noted.) (Note 1)
A
DD
PARAMETER
Supply Voltage
SYMBOL
V
CONDITIONS
MIN
TYP
MAX
UNITS
2.1
3.6
V
DD
f
f
f
f
= 315MHz
= 433MHz
= 315MHz
= 433MHz
2.9
3.3
6.7
7.3
4.3
4.8
PA off, V
0% duty cycle
(ASK or FSK)
at
RF
RF
RF
RF
DIN
10.7
11.4
V
at 50%
Supply Current
I
mA
DIN
DD
duty cycle (ASK)
(Notes 2, 3)
f
f
= 315MHz
10.5
11.4
0.2
17.1
18.1
V
at 100%
RF
RF
DIN
duty cycle (FSK)
= 433MHz (Note 3)
T = +25°C
A
Standby Current
I
V
< V
T < +85°C (Note 3)
120
700
300
nA
V
STDBY
ENABLE
IL
A
T < +125°C
1600
A
DIGITAL INPUTS AND OUTPUTS
V
0.25
-
DD
Data Input High
V
IH
Data Input Low
V
0.25
0.25
V
IL
Maximum Input Current
I
20
µA
IN
V
0.25
-
DD
Output Voltage High
Output Voltage Low
V
CLKOUT, load = 10kΩ || 10pF (Note 3)
CLKOUT, load = 10kΩ || 10pF (Note 3)
V
V
OH
V
OL
Maxim Integrated
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MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
AC Electrical Characteristics
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, V
= 2.1V to 3.6V, V
= V . T = -40°C to
ENABLE DD A
DD
+125°C, unless otherwise noted. Min and Max values are 100% tested at T = +125°C and are guaranteed by design and character-
A
ization over temperature, unless otherwise noted. Typical values are at V
= +2.7V, T = +25°C, unless otherwise noted.) (Note 1)
A
DD
PARAMETER
SYSTEM PERFORMANCE
Frequency Range
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
f
300
450
MHz
µs
RF
Settle to within 50kHz
200
Turn-On Time (Note 4)
t
ON
Settle to within 5kHz
350
100
20
ASK mode (Manchester coded)
FSK mode (Manchester coded)
Maximum Data Rate (Note 3)
kbps
kHz
f
f
= 315MHz
= 433MHz
55
Maximum FSK Frequency
Deviation
DEV[2:0] = 111
(Note 5)
RF
RF
80
T
T
T
= +25°C, V
= +2.7V
6.8
2.7
10
12.0
16.1
A
DD
Output Power
P
= +125°C, V
= +2.1V
5.3
12.2
35
dBm
OUT
A
DD
= -40°C, V
= +3.6V
A
DD
f
f
f
f
= 315MHz
= 433MHz
= 315MHz
= 433MHz
Transmit Efficiency with CW Tone
(Note 6)
RF
RF
RF
RF
%
%
34
27
Transmit Efficiency at 50% Duty
Cycle
25
PHASE-LOCKED-LOOP PERFORMANCE
VCO Gain
K
280
-75
-98
-74
-98
-50
-45
-40
300
MHz/V
dBc/Hz
VCO
f
f
f
f
= 100kHz
= 1MHz
OFFSET
OFFSET
OFFSET
OFFSET
f
f
= 315MHz
= 433MHz
RF
Phase Noise
= 100kHz
= 1MHz
RF
f
f
= 315MHz
= 433MHz
RF
RF
Maximum Carrier Harmonics
dBc
Reference Spur
dBc
kHz
MHz
ppm
pF
Loop Bandwidth
BW
Crystal Frequency Range
Crystal Tolerance
f
F
/32
XTAL
RF
50
4.5
Crystal Load Capacitance
C
(Note 7)
LOAD
Determined by CLK0 and CLK1;
see Table 1
Clock Output Frequency
F
/N
MHz
XTAL
Note 1: Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
Note 2: 50% duty cycle at 10kHz ASK data (Manchester coded).
Note 3: Guaranteed by design and characterization, not production tested.
Note 4: V
= V to V
= V . f
is defined as the frequency deviation from the desired carrier frequency.
ENABLE
IL
ENABLE
IH OFFSET
Note 5: Dependent on crystal and PCB trace capacitance.
Note 6: V > V , V > V , Efficiency = P /(V
x I ).
ENABLE
IH DATA
IH
OUT DD
DD
Note 7: Dependent on PCB trace capacitance.
Maxim Integrated
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MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Typical Operating Characteristics
(Typical Application Circuit, V
= +2.7V, T = +25°C, unless otherwise noted.)
A
DD
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
15
14
13
12
11
10
9
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
15
14
13
12
11
10
9
f
= 315MHz
f
= 315MHz
RF
f
= 433MHz
RF
RF
PA ON
PA 50% DUTY CYCLE AT 10kHz
PA ON
TA = -40°C
T
= -40°C
A
T
= +85°C
A
T
A
= +25°C
T = +25°C
A
T
A
= +125°C
T
A
= +85°C
TA = +85°C
T
A
= +25°C
T
= +125°C
T
= +125°C
A
A
T
A
= -40°C
3.0
8
8
7
7
2.1
2.4
2.7
3.0
3.3
3.6
2.1
2.4
2.7
3.3
3.6
2.1
2.4
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. OUTPUT POWER
SUPPLY CURRENT vs. OUTPUT POWER
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
12
11
10
9
12
11
10
9
f
= 433MHz
RF
f
= 315MHz
f
= 433MHz
RF
RF
PA 50% DUTY CYCLE AT 10kHz
T
= +85°C
A
PA ON
PA ON
8
8
T
A
= +125°C
7
7
T
A
= +25°C
6
6
5
5
T
A
= -40°C
3.0
50% DUTY CYCLE
4
50% DUTY CYCLE
4
3
3
2
2
2.1
2.4
2.7
3.3
3.6
-14
-10
-6
-2
2
6
10
-14
-10
-6
-2
2
6
10
SUPPLY VOLTAGE (V)
AVERAGE OUTPUT POWER (dBm)
AVERAGE OUTPUT POWER (dBm)
SUPPLY CURRENT AND OUTPUT POWER
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
vs. EXTERNAL RESISTOR
MAX1479 toc07
MAX1479 toc08
18
16
14
12
10
8
16
12
8
18
16
14
12
10
8
16
12
8
f
= 315MHz
f
= 433MHz
RF
RF
PA ON
PA ON
POWER
POWER
4
4
0
0
CURRENT
-4
-8
-12
-16
-4
-8
-12
-16
CURRENT
6
6
4
4
2
2
0.1
1
10
100
1k
10k
0.1
1
10
100
1k
10k
EXTERNAL RESISTOR (Ω)
EXTERNAL RESISTOR (Ω)
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MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, V
= +2.7V, T = +25°C, unless otherwise noted.)
A
DD
OUTPUT POWER vs. SUPPLY VOLTAGE
OUTPUT POWER vs. SUPPLY VOLTAGE
OUTPUT POWER vs. SUPPLY VOLTAGE
16
14
12
10
8
16
14
12
10
8
16
14
12
10
8
f
= 315MHz
f
= 315MHz
f
= 433MHz
RF
RF
RF
T
A
= -40°C
PA ON
ENVELOPE SHAPING
DISABLED
PA ON
PA ON
T
A
= -40°C
T = -40°C
A
T
A
= +25°C
T
A
= +25°C
T = +25°C
A
T = +85°C
A
T
= +85°C
T
= +85°C
A
A
T
= +125°C
3.0
T
= +125°C
T = +125°C
A
A
A
6
6
6
4
4
4
2.1
2.4
2.7
3.3
3.6
2.1
2.4
2.7
3.0
3.3
3.6
2.1
2.4
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
PHASE NOISE vs. OFFSET FREQUENCY
16
14
12
10
8
-40
f
= 433MHz
RF
-50
-60
PA ON
ENVELOPE SHAPING
DISABLED
T
= -40°C
A
f
= 315MHz
= 433MHz
RF
-70
T
A
= +25C
-80
-90
T
= +85°C
A
f
RF
-100
-110
-120
-130
-140
T
A
= +125°C
6
4
2.1
2.4
2.7
3.0
3.3
3.6
100
1k
10k
100k
1M
10M
SUPPLY VOLTAGE (V)
OFFSET FREQUENCY (Hz)
CLOCK SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
FREQUENCY STABILITY
vs. SUPPLY VOLTAGE
-40
-45
-50
-55
-60
-65
-70
10
8
f
= 315MHz
RF
CLKOUT SPUR = f ±f
10pF LOAD CAPACITANCE
RF CLKOUT
6
f
= 315MHz
RF
4
f
= f
/16
CLKOUT XTAL
2
0
-2
-4
-6
-8
-10
f
RF
= 433MHz
f
= f
/8
CLKOUT XTAL
f
= f
/4
CLKOUT XTAL
2.1
2.4
2.7
3.0
3.3
3.6
2.1
2.4
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
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MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Pin Description
PIN
NAME
DESCRIPTION
1
V
Supply Voltage. Bypass to GND with a 10nF and 220pF capacitor as close to the pin as possible.
DD
Mode Select. A logic low on MODE enables the device in ASK mode. A logic high on MODE enables the
device in FSK mode.
2
3
MODE
DIN
Data Input. Power amplifier is on when DIN is high in ASK mode. Frequency is high when DIN is high in
FSK mode.
4
5
ENABLE
CLKOUT
Standby/Power-Up Input. A logic low on ENABLE sets the device in standby mode.
Buffered Clock Output. Programmable through CLK0 and CLK1. See Table 1.
Power-Amplifier Supply Voltage. Bypass to GND with a 10nF and 220pF capacitor as close to the pin as
possible.
6
7
8
V
PA
DD_
Envelope-Shaping Output. ROUT controls the power-amplifier envelope rise and fall. Bypass to GND with
a 680pF and 220pF capacitor as close to the pin as possible.
ROUT
Power-Amplifier Output. Requires a pullup inductor to the supply voltage, which can be part of the output-
matching network to an antenna.
PAOUT
9
CLK0
CLK1
DEV0
DEV1
DEV2
XTAL1
XTAL2
GND
1st Clock Divider Setting. See Table 1.
10
11
12
13
14
15
16
2nd Clock Divider Setting. See Table 1.
1st FSK Frequency-Deviation Setting. See Table 2.
2nd FSK Frequency-Deviation Setting. See Table 2.
3rd FSK Frequency-Deviation Setting. See Table 2.
1st Crystal Input. f = 32 x f
.
RF
XTAL
2nd Crystal Input. f = 32 x f
.
RF
XTAL
Ground. Connect to system ground.
Exposed Ground Pad. EP is the power amplifier’s ground. It must be connected to PCB through a low-
inductance path.
—
EP
oscillator is running, the 300kHz PLL bandwidth allows
fast frequency recovery during power-amplifier toggling.
Detailed Description
The MAX1479 is a highly integrated ASK/FSK transmitter
operating over the 300MHz to 450MHz frequency band.
The device requires only a few external components to
complete a transmitter solution. The MAX1479 includes a
complete PLL and a highly efficient power amplifier. The
device can be set into a 0.2nA low-power shutdown mode.
Mode Selection
MODE (pin 2) sets the MAX1479 in either ASK or FSK
mode. When MODE is set low, the device operates as
an ASK transmitter. If MODE is set high, the device oper-
ates as an FSK transmitter. In the ASK mode, the DIN pin
controls the output of the power amplifier. A logic low on
DIN turns off the PA, and a logic high turns on the PA. In
the FSK mode, a logic low on the DIN pin is represented
by the low FSK frequency, and a logic-high input is rep-
resented by the high FSK frequency. (The ASK carrier
frequency and the lower FSK frequency are the same.)
The deviation is proportional to the crystal load imped-
ance and pulling capacitance. The maximum frequency
Shutdown Mode
ENABLE (pin 4) is internally pulled down with a 20μA
current source. If it is left unconnected or pulled low, the
MAX1479 goes into a low-power shutdown mode. In this
mode, the supply current drops to 0.2nA. When ENABLE
is high, the device is enabled and is ready for transmis-
sion after 200μs (frequency settles to within 50kHz).
The 200μs turn-on time of the MAX1479 is mostly
dominated by the crystal oscillator startup time. Once the
deviation is 55kHz for f
= 315MHz and 80kHz for
RF
f
= 433MHz.
RF
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MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Clock Output
Table 1. Clock Divider Settings
The MAX1479 has a dedicated digital output pin for the
frequency-divided crystal clock signal. This is to be used
as the time base for a microprocessor. The frequency-
division ratio is programmable through two digital input
pins (CLK0, CLK1), and is defined in Table 1. The clock
output is designed to drive a 3.5MHz CMOS rail-to-rail
signal into a 10pF capacitive load.
CLK1
CLK0
CLKOUT
0
0
1
1
0
1
0
1
Logic 0
F
F
/4
/8
XTAL
XTAL
f
/16
XTAL
Envelope-Shaping Resistor
Table 2. Frequency-Deviation Settings
The envelope-shaping resistor allows for a gentle turn-on/
turn-off of the PA in ASK mode. This results in a smaller
spectral width of the modulated PA output signal.
DEV2
DEV1
DEV0
DEVIATION
1/8 x max
1/4 x max
3/8 x max
1/2 x max
5/8 x max
3/4 x max
7/8 x max
Max
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Phase-Locked Loop
The PLL block contains a phase detector, charge pump,
integrated loop filter, VCO, asynchronous 32x clock
divider, and crystal oscillator. The PLL requires no exter-
nal components. The relationship between the carrier and
crystal frequency is given by:
fXTAL = fRF/32
Crystal Oscillator
The crystal oscillator in the MAX1479 is designed to pres-
ent a capacitance of approximately 3pF to ground from
the XTAL1 and XTAL2 pins in ASK mode. In most cases,
this corresponds to a 4.5pF load capacitance applied
to the external crystal when typical PCB parasitics are
added. In FSK mode, a percentage (defined by bits DEV0
to DEV2) of the 3pF internal crystal oscillator capacitance
is removed for a logic 1 on the DIN pin to pull the transmit
frequency. The frequency deviation is shown in Table 2. It
is very important to use a crystal with a load capaci-
tance that is equal to the capacitance of the MAX1479
crystal oscillator plus PCB parasitics. If very large FSK
frequency deviations are desired, use a crystal with a
larger motional capacitance and/or reduce PCB parasitic
capacitances.
When the output-matching network is properly tuned, the
power amplifier is highly efficient. The Typical Application
Circuit delivers +10dBm at a supply voltage of +2.7V, and
draws a supply current of 6.7mA for ASK/OOK operation
(V
at 50% duty cycle) and 10.5mA for FSK operation.
DIN
Thus, the overall efficiency at 100% duty cycle is 35%.
The efficiency of the power amplifier itself is about 50%.
An external resistor at ROUT sets the output power.
Applications Information
Output Matching to 50Ω
When matched to a 50Ω system, the MAX1479 PA is
capable of delivering more than +10dBm of output power
at V
= 2.7V. The output of the PA is an open-drain tran-
DD
sistor that requires external impedance matching and pul-
lup inductance for proper biasing. The pullup inductance
Power Amplifier
The PA of the MAX1479 is a high-efficiency, open-drain,
switch-mode amplifier. With a proper output-matching
network, the PA can drive a wide range of impedances,
including small-loop PCB trace antennas and any 50Ω
antennas. The output-matching network for a 50Ω anten-
na is shown in the Typical Application Circuit. The output-
matching network suppresses the carrier harmonics and
transforms the antenna impedance to an optimal imped-
ance at PAOUT (pin 8), which is about 250Ω.
from PAOUT to V
serves three main purposes: It forms
DD
a resonant tank circuit with the capacitance of the PA
output, provides biasing for the PA, and becomes a high-
frequency choke to reduce the RF energy coupling into
V
. Maximum efficiency is achieved when the PA drives
DD
a load of 250Ω. The recommended output-matching net-
work topology is shown in the Typical Application Circuit.
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MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
The objective of the matching network is to match the
power-amplifier output to the impedance of the small-loop
antenna. The matching components thus tune out the
loop inductance and transform the low radiative and resis-
tive parts of the antenna into the much higher value of the
PA output. This gives higher efficiency. The low radiative
and lossy components of the small-loop antenna result in
a higher Q matching network than the 50Ω network; thus,
the harmonics are lower.
Output Matching to
PCB Loop Antenna
In most applications, the MAX1479 power-amplifier output
has to be impedance matched to a small-loop antenna.
The antenna is usually fabricated out of a copper trace
on a PCB in a rectangular, circular, or square pattern.
The antenna has an impedance that consists of a lossy
component and a radiative component. To achieve high
radiating efficiency, the radiative component should be
as high as possible, while minimizing the lossy compo-
nent. In addition, the loop antenna has an inherent loop
inductance associated with it (assuming the antenna is
terminated to ground). For example, in a typical appli-
cation, the radiative impedance is less than 0.5Ω, the
lossy impedance is less than 0.7Ω, and the inductance is
approximately 50nH to 100nH.
Layout Considerations
A properly designed PCB is an essential part of any RF/
microwave circuit. On the power-amplifier output, use
controlled-impedance lines and keep them as short as
possible to minimize losses and radiation.
Keeping the traces short reduces parasitic inductance.
Generally, 1in of PCB trace adds about 20nH of parasitic
inductance. Parasitic inductance can have a dramatic
effect on the effective inductance. For example, a 0.5in
trace connecting a 100nH inductor adds an extra 10nH of
inductance, or 10%.
Table 3. Component Values for Typical
Application Circuit
VALUE FOR
VALUE FOR
COMPONENT
f
= 433MHz
f
= 315MHz
RF
RF
To reduce the parasitic inductance, use wider traces and
a solid ground or power plane below the signal traces.
Using a solid ground plane can reduce the parasitic
inductance from approximately 20nH/in to 7nH/in. Also,
use low-inductance connections to ground on all GND
L1
L3
22nH
27nH
18nH
22nH
C1
6.8pF
10pF
15pF
pins and place decoupling capacitors close to all V
C2
22pF
DD
connections.
C3
10nF
10nF
C4
680pF
6.8pF
220pF
10nF
680pF
15pF
C6
C8
220pF
10nF
C10
C11
C12
C14
C15
220pF
220pF
100pF
100pF
220pF
220pF
100pF
100pF
Maxim Integrated
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www.maximintegrated.com
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Typical Application Circuit
C15
C14
16
15
14
13
V
CC
FREQUENCY-
DEVIATION
INPUTS
V
DEV1
DEV0
CLK1
CLK0
DD
CRYSTAL
DRIVER
1
2
3
4
DEVIATION
12
11
10
9
C10
C11
LOOP
FILTER
PD/CP
MODE
MODE-SELECT
INPUT
ASK
FSK
DIVIDE
BY 32
VCO
PA
DIN
DATA INPUT
CLOCK-
DIVIDER
INPUTS
MAX1479
CLOCK
DIVIDER
ENVELOPE
SHAPING
ENABLE
ENABLE INPUT
5
6
7
8
L1
V
CC
C12
C8
C4
C1
C2
L3
CLOCK
OUTPUT
RF
OUTPUT
C3
C6
Chip Information
PROCESS: CMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE DOCUMENT
LAND
PATTERN NO.
CODE
NO.
16 TQFN-EP
T1633+2
21-0136
90-0030
Maxim Integrated
│ 9
www.maximintegrated.com
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
8/04
6/09
2/15
0
1
2
Initial release
—
Changed part number in Ordering Information to lead free and corrected errors
Revised Electrical Characteristics
1, 2, 7
2, 3
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
│ 10
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