HFA3724 Ver la hoja de datos (PDF) - Intersil
Número de pieza
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HFA3724 Datasheet PDF : 24 Pages
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HFA3724
Pin Description
PIN
SYMBOL
1
LIM1_BYP+
2
LIM1_In+
3
LIM1_In-
4
LIM1_BYP-
5, 6,
GND
7, 8
9
LPF_VCC
10
2V REF
11
LPF_BYP
12
LPF_TXI_In
13
LPF_TXQ_In
14
LPF_RXI_Out
15
LPF_RXQ_Out
16
LPF_Sel1
17
LPF_Sel0
18
19
20
21
22
23
24
25
26
27
28
29
30
31, 32
LPF_Tune1
LPF_Tune0
GND
LPF_RX_PE
LPF_TX_PE
LPF_TXQ-
LPF_TXQ+
LPF_TXI-
LPF_TXI+
LPF_RXQ-
LPF_RXQ+
LPF_RXI-
LPF_RXI+
GND
DESCRIPTION
DC feedback pin for Limiter amplifier 1. Requires good decoupling and minimum wire length to a solid signal
ground.
Non inverting analog input of Limiter amplifier 1.
Inverting input of Limiter amplifier 1.
DC feedback pin for Limiter amplifier 1. Requires good decoupling and minimum wire length to a solid signal
ground.
Ground. Connect to a solid ground plane.
Supply pin for the Low pass filter. Use high quality decoupling capacitors right at the pin.
Stable 2V reference voltage output for external applications. Loading must be higher than 10kΩ. A bypass
capacitor of at least 0.1µF is required.
Internal reference bypass pin. This is the common voltage (VCM) used for the LPF digital thresholds. Requires
0.1µF decoupling capacitor.
Low pass filter in phase (I) channel transmit input. Conventional or attenuated direct coupling is required for digital
inputs. (Note 7)
Low pass filter quadrature (Q) channel transmit input. Conventional or attenuated direct coupling is required for
digital inputs. (Note 7)
Low pass filter in phase (I) channel receive output. Requires AC coupling. (Note 8)
Low pass filter quadrature (Q) channel receive output. Requires AC coupling. (Note 8)
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 1µs.
SEL1 SEL0 Cutoff Frequency
SEL1 SEL0 Cutoff Frequency
LO LO 2.2MHz
HI
LO 8.8MHz
LO HI
4.4MHz
HI
HI
17.6MHz
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.
Ground. Connect to a solid ground plane.
Digital input control pin to enable the LPF receive mode of operation. Enable logic level is High.
Digital input control pin to enable the LPF transmit mode of operation. Enable logic level is High.
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.
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.
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.
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.
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.
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.
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.
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.
Ground. Connect to a solid ground plane.
6
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