HFA3766 Datasheet, PDF (5/11 Pages) Intersil Corporation – 400MHz AGC Quadrature IF Modulator/Demodulator

HFA3766
Pin Descriptions (Continued)
PIN
SYMBOL
DESCRIPTION
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 (DEMOD_RXI-), pin 33.
31, 32
GND
Ground. Connect to a solid ground plane.
33
DEMOD_RXI+ In phase demodulator positive output. AC coupling is required. Normally connects to the non inverting input of
the Low pass filter (LPF_RXI+), pin 30.
34
DEMOD_RXI- In phase demodulator negative output. AC coupling is required. Normally connects to the inverting input of the
Low pass filter (LPF_RXI-), pin 29.
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
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 Modulator open collector output, single ended. Termination resistor to V_CC with a typical value of 316Ω.
_OUT
43
DEMOD_RX Digital input control to enable the demodulator section. Enable logic level is High.
_PE
44
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 200µA_RMS. 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
MOD_V_CC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
46
LO_Out
Divide by 2 buffered output reference from “DEMOD_LO_in” input. Used for external applications where the de-
modulating 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
MOD_V_CC 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
GND
Ground. Connect to a solid ground plane.
54
AGC2_V_CC Supply pin for the AGC amplifier 2. Use high quality decoupling capacitors right at the pin.
5