HFA3761 데이터 시트보기 (PDF) - Intersil
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HFA3761 Datasheet PDF : 9 Pages
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HFA3761
Pin Descriptions
PIN
1
2
3
4
5,
6,
7, 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31, 32
33
34
SYMBOL
DESCRIPTION
AGC1_BYP+ DC feedback pin for AGC amplifier 1. Requires good decoupling and minimum wire length to a solid signal ground.
AGC1_In+ Non-inverting analog input of AGC amplifier 1.
GND
Ground. Connect to a solid ground plane.
AGC_Sel
This pin selects either differential or single ended input configuration for the first stage AGC. Ground this pin for
differential input configuration. Leave it floating for single ended input configuration.
AGC1_In- Inverting analog input of AGC amplifier 1.
AGC1_BYP- DC feedback pin for AGC amplifier 1. Requires good decoupling and minimum wire length to a solid signal ground.
GND
Ground. Connect to a solid ground plane.
LPF_VCC
2V REF
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.
LPF_BYP
Internal reference bypass pin. This is the common voltage (VCM) used for the LPF digital thresholds. Requires
0.1µF decoupling capacitor.
NC
Connected internally for test purposes. Pin must be left floating.
NC
Connected internally for test purposes. Pin must be left floating.
LPF_RXI_Out Low pass filter in phase (I) channel receive output. Requires AC coupling.
LPF_RXQ_Out Low pass filter quadrature (Q) channel receive output. Requires AC coupling.
LPF_Sel1
LPF_Sel0
Digital control input pins. Selects four programed cut off frequencies for the receive channel. Tuning speed from
one cutoff to another is less than 1µs.
SEL1 SEL0 CUTOFF FREQUENCY
LO LO
2.2MHz
LO HI
4.4MHz
SEL1 SEL0 CUTOFF FREQUENCY
HI
LO
8.8MHz
HI
HI
17.6MHz
LPF_Tune1
LPF_Tune0
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.
GND
Ground. Connect to a solid ground plane.
LPF_RX_PE Digital input control pin to enable the LPF receive mode of operation. Enable logic level is High.
GND
Ground. Connect to a solid ground plane.
NC
Connected internally for test purposes. Pin must be left floating.
NC
Connected internally for test purposes. Pin must be left floating.
NC
Connected internally for test purposes. Pin must be left floating.
NC
Connected internally for test purposes. Pin must be left floating.
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.
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.
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.
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.
GND
Ground. Connect to a solid ground plane.
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.
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.
4-4
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