User Manual

MAX7057
300MHz to 450MHz Frequency-Programmable
ASK/FSK Transmitter
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
( Typical Application Circuit , 50Ω system impedance, tuned for 315MHz to 433.92MHz operation, AVDD = DVDD = PAVDD = +2.1V to
+3.6V, f
RF
= 300MHz to 450MHz, f
CRYSTAL
= 16MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at AVDD =
DVDD = PAVDD = +2.7V, T
A
= +25°C, unless otherwise noted. All min and max values are 100% tested at T
A
= +125°C, and guaran-
teed by design and characterization over temperature, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL CHARACTERISTICS
Frequency Range 300 450 MHz
ENABLE transition low-to-high, frequency
settled to within 50kHz of the desired carrier
120
Power-On Time t
ON
ENABLE transition low-to-high, frequency
settled to within 5kHz of the desired carrier
260
μs
Manchester encoded 50
ASK mode
Nonreturn-to-Zero 100
Manchester encoded 50
Maximum Data Rate
FSK mode
Nonreturn-to-Zero 100
kbps
Frequency Switching Time
Time from end of SPI write to frequency
settled to within 5kHz of desired carrier
70 μs
PHASE-LOCKED LOOP (PLL)
VCO Gain K
VCO
320 MHz/V
10kHz offset -78
f
RF
= 315MHz
1MHz offset -98
10kHz offset -73
PLL Phase Noise
f
RF
= 433.92MHz
1MHz offset -98
dBc/Hz
Loop Bandwidth 300 kHz
Reference Frequency Input Level 500 mV
P-P
Frequency-Divider Range 19 28
Frequency Deviation (FSK) ±2 ±100 kHz
CRYSTAL OSCILLATOR
Crystal Frequency f
XTAL
10.71 16 23.68 MHz
Frequency Pulling by V
DD
4 ppm/V
Crystal Load Capacitance (Note 4) 10 pF
POWER AMPLIFIER (PA)
T
A
= +25°C (Note 3) 3.8 9.2 16.4
T
A
= +125°C, AVDD = DVDD = PAVDD =
+2.1V
2.4 5.2
Output Power (Note 1) P
OUT
T
A
= -40°C, AVDD = DVDD = PAVDD =
+3.6V (Note 3)
12.6 17.0
dBm
Modulation Depth 71 dB
f
RF
= 315MHz -29
Maximum Carrier Harmonics
With output matching
network
f
RF
= 433.92MHz -44
dBc
Reference Spur -45 dBc