HFA3726IN 데이터 시트보기 (PDF) - Intersil
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HFA3726IN Datasheet PDF : 21 Pages
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HFA3726
Pin Description (Continued)
PIN
SYMBOL
DESCRIPTION
35
Mod_RXQ+ Quadrature demodulator positive output. AC coupling is required. Normally connects to the non inverting input of
the Low pass filter (LPF_RXQ+), pin 28.
36
Mod_RXQ-
Quadrature demodulator negative output. AC coupling is required. Normally connects to the inverting input of the
Low pass filter (LPF_RXQ+), pin 27.
37
Mod_TXI+
In phase modulator non inverting input. AC coupling is required. This input is normally coupled to the Low pass
filter positive output (LPF_TXI+), pin 26.
38
Mod_TXI-
In phase modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter
negative output (LPF_TXI-), pin 25.
39
Mod_TXQ+ Quadrature modulator non inverting input. AC coupling is required. This input is normally coupled to the Low pass
filter positive output (LPF_TXQ+), pin 24.
40
Mod_TXQ-
Quadrature modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter
negative output (LPF_TXQ-), pin 23.
41
Mod_TX_PE Digital input control to enable the Modulator section. Enable logic level is High for transmit.
42
Mod_TX_IF_Out Modulator open collector output, single ended. Termination resistor to VCC with a typical value of 316Ω.
43
Mod_RX_PE Digital input control to enable the demodulator section. Enable logic level is High for receive.
44
Mod_LO_In Single ended local oscillator current input. Frequency of input signal must be twice the required modulator carrier
(2XLO)
and demodulator LO frequency. Input current is optimum at 200µARMS. Input matching networks and filters can
be designed for a wide range of power and impedances at this port. Typical input impedance is 130Ω. This pin
requires AC coupling. (Note 3)
NOTE: High second harmonic content input waveforms may degrade I/Q phase accuracy.
45
Mod_VCC
Modulator/Demodulator supply pin. Use high quality decoupling capacitors right at the pin.
46
Mod_LO_Out Divide by 2 buffered output reference from “Mod_LO_in” input. Used for external applications where the modulating
and demodulating carrier reference frequency is required. 50Ω single end driving capability.This output can be
disabled by use of pin 50. AC coupling is required, otherwise tie to VCC.
47
Mod_VCC
Modulator/Demodulator supply pin. Use high quality decoupling capacitors right at the pin.
48
Mod_IF_In+ Demodulator non inverting input. Requires AC coupling.
49
Mod_IF In-
Demodulator inverting input. Requires AC coupling.
50
LO_GND
When grounded, this pin enables the LO buffer (Mod_LO_Out). When open (NC) it disables the LO buffer.
51, 52,
53
GND
Ground. Connect to a solid ground plane.
54
LIM2_PE
Digital input control to enable the limiter amplifier 2. Enable logic level is High.
55
LIM2_VCC
Limiter amplifier 2 supply pin. Use high quality decoupling capacitors right at the pin.
56
LIM2_Out-
Positive output of limiter amplifier 2. Requires AC coupling.
57
LIM2_Out+
Negative output of limiter amplifier 2. Requires AC coupling.
58
GND
Ground. Connect to a solid ground plane.
59
RSSI_RL2
Load resistor to ground. Nominal value is 6kΩ. This load is used to terminate the LIM RSSI current output and
maintain temperature and process variation to a minimum.
60
LIM2_RSSI Current output of RSSI for the limiter amplifier 2. Connect in parallel with the RSSI output of the amplifier limiter 1
for cascaded response.
61
LIM2_BYP+ DC feedback pin for Limiter amplifier 2. Requires good decoupling and minimum wire length to a solid signal
ground.
62
LIM2_In+
Non inverting analog input of Limiter amplifier 2.
63
LIM2_In-
Inverting input of Limiter amplifier 2.
64
LIM2_BYP- DC feedback pin for Limiter amplifier 2. Requires good decoupling and minimum wire length to a solid signal
ground.
5
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