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HFA3724 Datasheet(PDF) 6 Page - Intersil Corporation |
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HFA3724 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 24 page 6 Pin Description PIN SYMBOL DESCRIPTION 1 LIM1_BYP+ DC feedback pin for Limiter amplifier 1. Requires good decoupling and minimum wire length to a solid signal ground. 2 LIM1_In+ Non inverting analog input of Limiter amplifier 1. 3 LIM1_In- Inverting input of Limiter amplifier 1. 4 LIM1_BYP- DC feedback pin for Limiter amplifier 1. Requires good decoupling and minimum wire length to a solid signal ground. 5, 6, 7, 8 GND Ground. Connect to a solid ground plane. 9 LPF_VCC Supply pin for the Low pass filter. Use high quality decoupling capacitors right at the pin. 10 2V REF Stable 2V reference voltage output for external applications. Loading must be higher than 10k Ω. A bypass capacitor of at least 0.1 µF is required. 11 LPF_BYP Internal reference bypass pin. This is the common voltage (VCM) used for the LPF digital thresholds. Requires 0.1 µF decoupling capacitor. 12 LPF_TXI_In Low pass filter in phase (I) channel transmit input. Conventional or attenuated direct coupling is required for digital inputs. (Note 7) 13 LPF_TXQ_In Low pass filter quadrature (Q) channel transmit input. Conventional or attenuated direct coupling is required for digital inputs. (Note 7) 14 LPF_RXI_Out Low pass filter in phase (I) channel receive output. Requires AC coupling. (Note 8) 15 LPF_RXQ_Out Low pass filter quadrature (Q) channel receive output. Requires AC coupling. (Note 8) 16 LPF_Sel1 Digital control input pins. Selects four programed cut off frequencies for both receive and transmit channels. Tuning speed from one cutoff to another is less than 1 µs. SEL1 SEL0 Cutoff Frequency SEL1 SEL0 Cutoff Frequency LO LO 2.2MHz HI LO 8.8MHz LO HI 4.4MHz HI HI 17.6MHz 17 LPF_Sel0 18 LPF_Tune1 These two pins are used to fine tune the Low pass filter cutoff frequency. A resistor connected between the two pins (RTUNE) will fine tune both transmit and receive filters. Refer to the tuning equation in the LPF AC specifications. 19 LPF_Tune0 20 GND Ground. Connect to a solid ground plane. 21 LPF_RX_PE Digital input control pin to enable the LPF receive mode of operation. Enable logic level is High. 22 LPF_TX_PE Digital input control pin to enable the LPF transmit mode of operation. Enable logic level is High. 23 LPF_TXQ- Negative output of the transmit Low pass filter, quadrature channel. AC coupling is required. Normally connects to the inverting input of the quadrature Modulator (Mod_TXQ-), pin 40. 24 LPF_TXQ+ Positive output of the transmit Low pass filter, quadrature channel. AC coupling is required. Normally connects to the non inverting input of the quadrature Modulator (Mod_TXQ+), pin 39. 25 LPF_TXI- Negative output of the transmit Low pass filter, in phase channel. AC coupling is required. Normally connects to the inverting input of the in phase Modulator (Mod_TXI-), pin 38. 26 LPF_TXI+ Positive output of the transmit Low pass filter, in phase channel. AC coupling is required. Normally connects to the non inverting input of the in phase Modulator (Mod_TXI+), pin 37. 27 LPF_RXQ- Low pass filter inverting input of the receive quadrature channel. AC coupling is required. This input is normally coupled to the negative output of the quadrature demodulator (Mod_RXQ-), pin 36. 28 LPF_RXQ+ Low pass filter non inverting input of the receive quadrature channel. AC coupling is required. This input is normally coupled to the positive output of the quadrature demodulator (Mod_RXQ+), pin 35. 29 LPF_RXI- Low pass filter inverting input of the receive in phase channel. AC coupling is required. This input is normally coupled to the negative output of the in phase demodulator (Mod_RXI-), pin 34. 30 LPF_RXI+ Low pass filter non inverting input of the receive in phase channel. AC coupling is required. This input is normally coupled to the positive output of the in phase demodulator (Mod_RXI-), pin 33. 31, 32 GND Ground. Connect to a solid ground plane. HFA3724 |
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