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TRF4400 Datasheet(PDF) 6 Page - Texas Instruments |
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TRF4400 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 21 page TRF4400 SINGLECHIP 433MHz RF TRANSMITTER SLWS113D −NOVEMBER 2000 − REVISED FEBRUARY 2005 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over full range of operating conditions, (typical values are at PA_VCC, PLL_VCC, DIG_VCC, VCC = 3 V, TA = 25°C) (unless otherwise noted) (continued) direct digital synthesizer (DDS) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Reference oscillator input frequency, ƒref As oscillator 15 26 MHz Reference oscillator input frequency, ƒref As buffer 15 26 MHz Programmable DDS divider ratio 22 bits 0 4194303 DDS divider resolution, ∆ƒ N × ƒref ÷ 224 FSK − modulation register ratio 8 bits 0 1020 FSK − modulation resolution N × ƒref ÷ 222 PLL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT RF input frequency 420 433 450 MHz RF input power Internal VCO bypassed; external input applied to VCO_TANK2 −10 dBm RF input divider ratio, N 256 512 RF output frequency resolution N × ƒref ÷ 224 Charge pump current Programmable with external resistor, 100-k Ω nominal, APLL = 0 70 µA power amplifier PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Frequency range 420 433 450 MHz 0-dB attenuation 7 Amplifier output power (see Note 2) 10-dB attenuation −3 dBm Amplifier output power (see Note 2) 20-dB attenuation −12 dBm Amplifier off −70 Optimal load impedance See Figure 11 Ω 2nd-order harmonic VCC = 3 V, 0-dB attenuation −10 dBc 3rd-order harmonic VCC = 3 V, 0-dB attenuation −20 dBc NOTE 2: The device and output matching network (see Application Information section) is designed to provide the output power into a 50- Ω load. The device stability was tested (no parasitic oscillations) with an output VSWR of 10:1 over all phase angles and is not tested in production. typical mode switching and lock times OPERATION TEST CONDITIONS MIN TYP MAX UNIT Standby to transmit time† From rising edge of STDBY to valid RF signal at PA_OUT, APLL = 111b (maximum) 500 µs † Highly dependent upon loop filter topology |
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