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MAX1479ATE+

P1-P3P4-P6P7-P9P10-P10
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
4 _______________________________________________________________________________________
Typical Operating Characteristics
(
Typical Application Circuit
, V
DD
= +2.7V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1479 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.33.02.4 2.7
8
9
10
11
13
12
14
15
7
2.1 3.6
f
RF
= 315MHz
PA ON
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
3.33.02.72.4
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
5.0
2.1 3.6
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1479 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
f
RF
= 315MHz
PA 50% DUTY CYCLE AT 10kHz
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1479 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.33.02.4 2.7
8
9
10
11
13
12
14
15
7
2.1 3.6
f
RF
= 433MHz
PA ON
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
3.33.02.72.4
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
5.0
2.1 3.6
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1479 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
f
RF
= 433MHz
PA 50% DUTY CYCLE AT 10kHz
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
SUPPLY CURRENT vs. OUTPUT POWER
MAX1479 toc05
AVERAGE OUTPUT POWER (dBm)
SUPPLY CURRENT (mA)
62-2-6-10
3
4
5
6
7
8
9
10
11
12
2
-14 10
f
RF
= 315MHz
PA ON
50% DUTY CYCLE
SUPPLY CURRENT vs. OUTPUT POWER
MAX1479 toc06
AVERAGE OUTPUT POWER (dBm)
SUPPLY CURRENT (mA)
62-2-6-10
3
4
5
6
7
8
9
10
11
12
2
-14 10
f
RF
= 433MHz
PA ON
50% DUTY CYCLE
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
MAX1479 toc07
EXTERNAL RESISTOR (Ω)
SUPPLY CURRENT (mA)
OUTPUT POWER (dBm)
1k1001 10
4
6
8
10
14
12
16
18
2
-12
-8
-4
0
8
4
12
16
-16
0.1 10k
f
RF
= 315MHz
PA ON
POWER
CURRENT
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
_______________________________________________________________________________________
5
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX1479 toc10
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
3.33.02.72.4
6
8
10
12
14
16
4
2.1 3.6
f
RF
= 433MHz
PA ON
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
T
A
= -40
°
C
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX1479 toc11
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
3.33.02.72.4
6
8
10
12
14
16
4
2.1 3.6
f
RF
= 315MHz
PA ON
ENVELOPE SHAPING
DISABLED
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
T
A
= -40
°
C
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX1479 toc12
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
3.33.02.72.4
6
8
10
12
14
16
4
2.1 3.6
f
RF
= 433MHz
PA ON
ENVELOPE SHAPING
DISABLED
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
T
A
= -40
°
C
PHASE NOISE vs. OFFSET FREQUENCY
MAX1479 toc13
OFFSET FREQUENCY (Hz)
PHASE NOISE (dBc/Hz)
1M100k10k1k
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-140
100 10M
f
RF
= 315MHz
f
RF
= 433MHz
CLOCK SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
MAX1479 toc14
SUPPLY VOLTAGE (V)
CLKOUT SPUR MAGNITUDE (dBc)
3.33.02.72.4
-65
-60
-55
-50
-45
-40
-70
2.1 3.6
f
RF
= 315MHz
CLKOUT SPUR = f
RF
±
f
CLKOUT
10pF LOAD CAPACITANCE
f
CLKOUT
= f
XTAL
/16
f
CLKOUT
= f
XTAL
/4
f
CLKOUT
= f
XTAL
/8
FREQUENCY STABILITY
vs. SUPPLY VOLTAGE
MAX1479 toc15
SUPPLY VOLTAGE (V)
FREQUENCY STABILITY (ppm)
3.33.02.72.4
-8
-6
-4
-2
0
2
4
6
8
10
-10
2.1 3.6
f
RF
= 315MHz
f
RF
= 433MHz
Typical Operating Characteristics (continued)
(
Typical Application Circuit
, V
DD
= +2.7V, T
A
= +25°C, unless otherwise noted.)
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX1479 toc09
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
3.33.02.72.4
6
8
10
12
14
16
4
2.1 3.6
f
RF
= 315MHz
PA ON
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= +85
°
C
T
A
= -40
°
C
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
6 _______________________________________________________________________________________
Detailed Description
The MAX1479 is a highly integrated ASK/FSK transmit-
ter operating over the 300MHz to 450MHz frequency
band. The device requires only a few external compo-
nents 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.
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
transmission after 200µs (frequency settles to within
50kHz).
The 200µs turn-on time of the MAX1479 is mostly domi-
nated by the crystal oscillator startup time. Once the
oscillator is running, the 300kHz PLL bandwidth allows
fast frequency recovery during power-amplifier toggling.
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
operates 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 represented by the high FSK frequency.
(The ASK carrier frequency and the lower FSK frequen-
cy are the same.) The deviation is proportional to the
crystal load impedance and pulling capacitance. The
maximum frequency deviation is 55kHz for f
RF
=
315MHz and 80kHz for f
RF
= 433MHz.
Pin Description
PIN
NAME
DESCRIPTION
1V
DD
Supply Voltage. Bypass to GND with a 10nF and 220pF capacitor as close to the pin as possible.
2
MODE
Mode Select. A logic low on MODE enables the device in ASK mode. A logic high on MODE enables the
device in FSK mode.
3DIN
Data Input. Power amplifier is on when DIN is high in ASK mode. Frequency is high when DIN is high in
FSK mode.
4
ENABLE
Standby/Power-Up Input. A logic low on ENABLE sets the device in standby mode.
5
CLKOUT
Buffered Clock Output. Programmable through CLK0 and CLK1. See Table 1.
6
V
DD_
PA
Power-Amplifier Supply Voltage. Bypass to GND with a 10nF and 220pF capacitor as close to the pin as
possible.
7ROUT
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.
8
PAOUT
Power-Amplifier Output. Requires a pullup inductor to the supply voltage, which can be part of the output-
matching network to an antenna.
9 CLK0 1st Clock Divider Setting. See Table 1.
10 CLK1 2nd Clock Divider Setting. See Table 1.
11 DEV0 1st FSK Frequency-Deviation Setting. See Table 2.
12 DEV1 2nd FSK Frequency-Deviation Setting. See Table 2.
13 DEV2 3rd FSK Frequency-Deviation Setting. See Table 2.
14
XTAL1
1st Crystal Input. f
RF
= 32 x f
XTAL
.
15
XTAL2
2nd Crystal Input. f
RF
= 32 x f
XTAL
.
16 GND Ground. Connect to system ground.
—EP
Exposed Ground Pad. EP is the power amplifier’s ground. It must be connected to PCB through a low-
inductance path.
P1-P3P4-P6P7-P9P10-P10

MAX1479ATE+

Mfr. #:
Buy MAX1479ATE+
Manufacturer:
Maxim Integrated
Description:
RF Transmitter 300MHz - 450MHz ASK/FSK Transmitter
Lifecycle:
New from this manufacturer.
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