Datasheet MAX1472 (Maxim) - 5

300MHz-to-450MHz Low-Power, Crystal-Based ASK Transmitter MAX1472 Typical Operating Characteristics (continued)
(Typical Application Circuit, VDD = 2.7V, TA = +25°C, unless otherwise noted.)
TRANSMIT POWER EFFICIENCY TRANSMIT POWER EFFICIENCY TRANSMIT POWER EFFICIENCY vs. SUPPLY VOLTAGE vs. SUPPLY VOLTAGE vs. SUPPLY VOLTAGE
50 50 45 +25°C -40°C 45 MAX1472 toc10 45 -40°C MAX1472 toc11 MAX1472 toc12 40 +25°C +25°C -40°C 40 40 35 +125°C 35 +125°C 35 30 EFFICIENCY (%) +85°C EFFICIENCY (%) EFFICIENCY (%) 30 +85°C +125°C 30 +85°C 25 OOK OUTPUT AT CW OUTPUT 25 OOK OUTPUT AT 50% DUTY CYCLE f 50% DUTY CYCLE RF = 433MHz fRF = 315MHz fRF = 433MHz 25 20 20 2.0 2.4 2.8 3.2 3.6 2.0 2.4 2.8 3.2 3.6 2.0 2.4 2.8 3.2 3.6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
SUPPLY CURRENT AND OUTPUT POWER PHASE NOISE vs. OFFSET FREQUENCY vs. EXTERNAL RESISTOR SUPPLY CURRENT vs. OUTPUT POWER
MAX1472 toc14 -40 12 12 10 fRF = 315MHz fRF = 315MHz -50 POWER 9 10 10 MAX1472 toc13 -60 MAX1472 toc15 SUPPLY CURRENT (mA) 8 -70 8 CURRENT 8 7 -80 CW -90 6 6 6 -100 5 PHASE NOISE (dBc/Hz) 4 4 -110 OUTPUT POWER (dBm) SUPPLY CURRENT (mA) 4 -120 2 2 50% DUTY CYCLE 3 -130 -140 0 0 2 10 100 1k 10k 100k 1M 10M 0.1 1 10 100 1000 0 2 4 6 8 10 fOFFSET (Hz) EXTERNAL RESISTOR (Ω) OUTPUT POWER (dBm)
FREQUENCY SETTLING TIME AM DEMODULATION OF PA OUTPUT
MAX1472 toc16 MAX1472 toc17 DATA RATE = 100kHz ENABLE 25kHz/div TRANSITION FROM LOW TO HIGH START: 0s 1ms 15%/div ENABLE 2.5kHz/div TRANSITION FROM LOW TO HIGH START: 0s 1ms START: 0s STOP: 20µs
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