HFA3624 查看數據表（PDF） - Intersil

零件编号

产品描述 (功能)

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HFA3624

2.4GHz Up/Down Converter

Intersil 

HFA3624

Pin Descriptions

PINS

1

3

5

7

8

10

12

14

15

16

17

19

20

21

22

SYMBOL

DESCRIPTION

LNA_RX_VCC2 Receive Channel Low Noise Amplifier Output Stage Positive Power Supply. Use high quality decoupling ca-

pacitors right at the pin. A 5pF chip capacitor is recommended.

LNA_RX_OUT

Receive Channel Low Noise Amplifier Output (2400MHz to 2500MHz). The nominal impedance of 50Ω,

over the operating frequency range, is achieved with an on chip narrowband tuned circuit. This pin requires

AC coupling.

LNA_RX_VCC1 Receive Channel Low Noise Amplifier Input Stage Positive Power Supply. Use high quality decoupling ca-

pacitors right at the pin. A 200pF chip capacitor is recommended.

LNA_RX_IN

Receive Channel Low Noise Amplifier Input (2400MHz to 2500MHz). The nominal impedance of 50Ω, over

the operating frequency range, is achieved with an on chip narrowband tuned circuit. This pin requires AC

coupling.

PRE_TX_OUT

Transmit Channel Power Pre-Amplifier Output (2400MHz to 2500MHz). The nominal impedance of 50Ω,

over the operating frequency range, is achieved with on chip narrowband tuned circuit. This pin requires AC

coupling.

PRE_TX_VCC2 Transmit Channel Power Pre-Amplifier Output Stage Positive Power Supply. Use high quality decoupling ca-

pacitors right at the pin. A 200pF chip capacitor is recommended.

PRE_TX_IN

Transmit Channel Power Pre-Amplifier Input (2400MHz to 2500MHz). The nominal impedance of 50Ω, over

the operating frequency range, is achieved with an on chip narrowband tuned circuit. This pin requires AC

coupling.

PRE_TX_VCC1 Transmit Channel Power Pre-Amplifier Input Stage Positive Power Supply. Use high quality decoupling ca-

pacitors right at the pin. A 200pF chip capacitor is recommended.

TX_PE

Transmit Channel Power Enable Control Input. TTL compatible input. Refer to “Power Control Truth Table”

on previous page.

TX_VCC

Transmit Channel Positive Power Supply. Use high quality decoupling capacitors right at the pin. A 200pF

chip capacitor is recommended.

TXM_RF

Transmit Channel Mixer RF Output (2400MHz to 2500MHz). The nominal impedance of 50Ω, over the op-

erating frequency range, is achieved with an on chip narrowband tuned circuit. This pin requires AC cou-

pling.

TXM_IF+

Transmit Channel Mixer IF+ Input (10MHz to 400MHz). The TXM_IF+ and TXM_IF- pins form a high input

impedance differential pair. Either input (or both inputs for special applications) may be used for the IF sig-

nal. Typically the TXM_IF- pin is bypassed to ground with a 470pF capacitor and the TXM_IF+ pin is AC

coupled to the transmit IF signal. The high impedance input requires external termination. The specified in-

put impedance is modeled as a resistor in parallel with a capacitor derived from S parameters at 280MHz.

The input Impedance will increase at lower IF frequencies.

This pin requires AC coupling. Increasing the AC coupling capacitor to larger than 1000pF will degrade

Transmit Enable Time.

TXM_IF-

Transmit Channel Mixer IF- Input (10MHz to 400MHz). The TXM_IF+ and TXM_IF- pins form a high input

impedance differential pair. Either input (or both for special applications) may be used for the IF signal. Typ-

ically the TXM_IF- pin is bypassed to ground with a 470pF capacitor and the TXM_IF+ pin is AC coupled to

the transmit IF signal. The high impedance input requires external termination. The specified input imped-

ance is modeled as a resistor in parallel with a capacitor derived from S parameters at 280MHz. The input

impedance will increase at lower IF frequencies.

This pin requires AC coupling. Increasing the AC coupling capacitor to larger than 1000pF will degrade

Transmit Enable Time.

LO_IN

Local Oscillator Input (2000MHz to 2490MHz). The LO_IN and LO_BY pins form a differential pair with a

mutual broadband 50Ω impedance. Refer to the LO_BY pin for details. The recommended LO power is -

3dBm, however usable performance is obtained for the range -6dBm to +3dBm. The LO_IN pin requires AC

coupling.

LO_BY

Local Oscillator Input Bypass (2000MHz to 2490MHz). The LO_IN and LO_BY pins form a differential pair

with a mutual broadband 50Ω input impedance. The LO_BY pin can be used as a signal input, but may

have slightly degraded performance due to a clamp circuit to GND. Typically the LO_BY pin is bypassed to

GND with a 5pF capacitor. The LO_BY pin requires AC coupling.

2-32

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