HFA3763 Ver la hoja de datos (PDF) - Intersil
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HFA3763 Datasheet PDF : 10 Pages
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HFA3763
Pin Descriptions
PIN
SYMBOL
9
LPF_VCC
10
2V REF
11
LPF_BYP
12
LPF_TXI_In
13
LPF_TXQ_In
14
NC
15
NC
16
LPF_Sel1
17
LPF_Sel0
18
LPF_Tune1
19
LPF_Tune0
20
TX D or A
22
LPF_TX_PE
23
LPF_TXQ-
24
LPF_TXQ+
25
LPF_TXI-
26
LPF_TXI+
27
NC
28
NC
29
NC
30
NC
33
NC
34
NC
35
NC
36
NC
37
Mod_TXI+
38
Mod_TXI-
39
Mod_TXQ+
40
Mod_TXQ-
DESCRIPTION
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. AC couple for analog input.
Low pass filter quadrature (Q) channel transmit input. Conventional or attenuated direct coupling is required for
digital inputs. AC couple for analog input.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Digital control input pins. Selects four programmed cut off frequencies for the transmit 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
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 the transmit filters. Refer to the tuning equation in the LPF AC specifications.
Selects the configuration of the Transmit baseband input for either Digital or Analog (500mVP-P max).
Tie to a High for Analog and Ground for Digital inputs. Requires decoupling capacitor for analog and a simple direct
coupled attenuator for digital inputs.
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.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
Connected internally for test purpose. Leave this pin floating.
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.
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.
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.
Quadrature modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter
negative output (LPF_TXQ-), pin 23.
4-4
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