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TRF5901 Datasheet(PDF) 5 Page - Texas Instruments |
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TRF5901 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 34 page TRF5901 SINGLE-CHIP RF TRANSCEIVER SWRS014 – DECEMBER 2002 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION DDS_VCC 18 Direct digital synthesizer supply voltage DEM_GND 38 Quadrature demodulator ground DEM_TANK 34, 35 I/O Quadrature demodulator tank connection DEM_VCC 36 Quadrature demodulator supply voltage DIG_GND 21 Digital ground DIG_VCC 20 Digital supply voltage IF_GND 40 Intermediate frequency (IF) section ground IF1_IN 42 I Single-ended input for the 1st intermediate frequency (IF) amplifier IF1_OUT 41 O Single-ended output for the 1st intermediate frequency (IF) amplifier IF2_IN 39 I Single-ended input for the 2nd IF amplifier/limiter LNA_GND 1, 3 Low-noise amplifier ground LNA_IN 2 I Low-noise amplifier input LNA_OUT 47 O Low-noise amplifier output, open collector LNA_VCC 48 Low-noise amplifier supply voltage LOCKDET 11 O PLL lock detect output, active high. PLL locked when LOCKDET = 1. MIX_GND 43 Mixer ground MIX_IN 46 I Single-ended RF mixer input MIX_OUT 44 O Single-ended RF mixer output MIX_VCC 45 Mixer supply voltage MODE 17 I Mode select input. The functionality of the device in Mode0 or Mode1 can be programmed via the A-, B-, C-, and D-word of the serial control interface. GND 22 Ground PA_GND 6 Power amplifier ground PA_OUT 5 O Power amplifier output, open collector PA_VCC 4 Power amplifier supply voltage PD_OUT1 10 O Charge pump output – PLL in locked condition PD_OUT2 9 O Charge pump output – PLL in unlocked condition PD_SET 8 Charge pump current setting terminal. An external resistor (RPD) is connected to this terminal to set the nominal charge pump current. PLL_GND 7 PLL ground PLL_VCC 12 PLL supply voltage RSSI_OUT 33 O Receive strength signal indicator, analog output S&H_CAP 29 I/O Connection for sample and hold capacitor for the data slicer. This capacitor determines the integration time constant of the integrator while in the learning mode. STDBY 16 I Standby control for the TRF5901, active low. While STDBY = 0, the contents of the control registers are still valid and can be programmed via the serial control interface. STROBE 25 I Serial interface strobe signal TX_DATA 19 I Digital modulation buffered input for FSK/FM modulation of the carrier, active high VCO_TANK1 13 I VCO tank circuit connection. Should be left open if an external VCO is used. VCO_TANK2 14 I VCO tank circuit connection. May also be used to input an external VCO signal. VREF 37 I Reference voltage for the quadrature demodulator XOSC1 23 O Reference crystal oscillator connection XOSC2 24 I Reference crystal oscillator connection. May be used as a single-ended clock input if an external crystal is not used. |
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