HFA3761IN 데이터 시트보기 (PDF) - Intersil
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HFA3761IN Datasheet PDF : 9 Pages
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HFA3761
Pin Descriptions (Continued)
PIN
SYMBOL
DESCRIPTION
35
DEMOD_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
DEMOD_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
NC
Connected internally for test purposes. Pin must be left floating.
38
NC
Connected internally for test purposes. Pin must be left floating.
39
NC
Connected internally for test purposes. Pin must be left floating.
40
NC
Connected internally for test purposes. Pin must be left floating.
41
GND
Ground. Connect to a solid ground plane.
42
DEMOD_VCC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
43
DEM_RX_PE Digital input control to enable the demodulator section. Enable logic level is High.
44
DEM_LO_In Single ended local oscillator current input. Frequency of input signal must be twice the required demodulator LO
(2XLO)
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: High second harmonic content input waveforms may degrade I/Q phase accuracy.
45
DEMOD_VCC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
46
DEM_LO_Out Divide by 2 buffered output reference from “DEMOD_LO_in” input. Used for external applications where the
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.
47
DEMOD_VCC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
48
DEMOD_IFIN+ Demodulator, non-inverting input. Requires AC coupling.
49
DEMOD_IFIN- Demodulator, inverting input. Requires AC coupling.
50
LO_GND When grounded, this pin enables the LO buffer (DEMOD_LO_Out). When open (NC) it disables the LO buffer.
51, 52, 53
54
55
56
GND
AGC2_VCC
AGC2_Out-
AGC2_Out+
Ground. Connect to a solid ground plane.
Supply pin for the AGC amplifier 2. Use high quality decoupling capacitors right at the pin.
Positive output of AGC amplifier 2. Requires AC coupling.
Negative output of AGC amplifier 2. Requires AC coupling.
57
AGC2_PE Digital input control to enable the AGC amplifier 2. Enable logic level is High.
58
AGC2_VCC Supply pin for the AGC amplifier 2. Use high quality decoupling capacitors right at the pin.
59
GND
Ground. Connect to a solid ground plane.
60
AGC2_VAGC AGC amplifier 2, AGC control input.
61
AGC2_BYP+ DC feedback pin for AGC amplifier 2. Requires good decoupling and minimum wire length to a solid signal ground.
62
AGC2_In+ Non-inverting analog input of AGC amplifier 2.
63
GND
Ground. Connect to a solid ground plane.
64
AGC2_In- Inverting input of AGC amplifier 2.
65
AGC2_BYP- DC feedback pin for AGC amplifier 2. Requires good decoupling and minimum wire length to a solid signal ground.
66 - 73
GND
Ground. Connect to a solid ground plane.
74
AGC1_VCC AGC amplifier 1 supply pin. Use high quality decoupling capacitors right at the pin.
75
AGC1_Out- Negative output of AGC amplifier 1. Requires AC coupling.
76
AGC1_Out+ Positive output of AGC amplifier 1. Requires AC coupling.
77
AGC1_PE Digital input control to enable the AGC amplifier 1. Enable logic level is High.
78
AGC1_VCC AGC amplifier 1 supply pin. Use high quality decoupling capacitors right at the pin.
79
GND
Ground. Connect to a solid ground plane.
80
AGC1_VAGC AGC amplifier 1, AGC control input.
4-5
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