HFA3763 Ver la hoja de datos (PDF) - Intersil

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HFA3763

400MHz Quadrature Modulator and AGC

Intersil 

HFA3763

Pin Descriptions (Continued)

PIN

SYMBOL

DESCRIPTION

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 250Ω.

44

Mod_LO_In Single ended local oscillator current input. Frequency of input signal must be twice the required modulator carrier

(2XLO)

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: High second harmonic content input waveforms may degrade I/Q phase accuracy.

45

Mod_VCC

Modulator 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. AC

coupling is required. This output can be disabled by shorting to VCC or floating pin 50.

47

Mod_VCC

Modulator supply pin. Use high quality decoupling capacitors right at the pin.

48

MOD_BYP

This pin must be connected to pin 49 and decoupled to gnd. (Note 1)

49

MOD_BYP

This pin must be connected to pin 48. (Note 1)

50

LO_GND

When grounded, this pin enables the LO buffer (Mod_LO_Out). When open (NC) it disables the LO buffer.

55

IF_AGC_IN AC coupled input to the AGC amplifier.

57

AGC_VCC

AGC supply pin supply pin. Use high quality decoupling capacitors right at the pin.

59

AGC_CTRL AGC control DC control voltage input requires external resistor to set scale factor. 10K for optimum temp. co. May

require decoupling filtering capacitor.

61

63

65

67

See

Pinout

AGC_VCC

AGC_PE

AGC_IF_OUT

AGC_VCC

GND

AGC supply pin supply pin. Use high quality decoupling capacitors right at the pin.

Digital input control for the AGC amplifier. Enable logic level is High.

AGC amplifier output. Output impedance of 250Ω. Need to be connected to VCC by an inductor with reactance

well above 250Ω.

AGC supply pin supply pin. Use high quality decoupling capacitors right at the pin.

All remaining pins not listed above must be connected to a solid ground plane.

NOTE:

1. If pin 50 is grounded, otherwise float.

4-5

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