MAX2411 查看數據表（PDF） - Maxim Integrated

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MAX2411

Low-Cost RF Up/Downconverter with LNA and PA Driver

Maxim Integrated 

Low-Cost RF Up/Downconverter

with LNA and PA Driver

______________________________________________________________Pin Description

PIN

1, 3, 4, 12, 14,

18, 20, 23, 28

2

5, 10

6

7

8

9

11

13

15, 17

16

19

21

22

NAME

GND

LNAIN

VCC

RXEN

LO

LO

TXEN

GC

PADROUT

GND

PADRIN

TXMXOUT

IF

IF

FUNCTION

Ground. Connect GND to the PC board ground plane with minimal inductance.

RF Input to LNA. AC couple to this pin. At 1.9GHz, LNAIN can be easily matched to 50Ω with one

external shunt 1pF capacitor.

Supply Voltage (2.7V to 5.5V). Bypass VCC to GND at each pin with a 47pF capacitor as close to

each pin as possible.

Logic-Level Enable for Receiver Circuitry. A logic high turns on the receiver. When TXEN and

RXEN are both at a logic high, the part is placed in standby mode, with a 160µA (typical) supply

current. If TXEN and RXEN are both at a logic low, the part is set to shutdown mode, with a

0.1µA (typical) supply current.

50Ω Local-Oscillator (LO) Input Port. AC couple to this pin.

50Ω Inverting Local-Oscillator Input Port. For single-ended operation, connect LO directly to

GND. If a differential LO signal is available, AC couple the inverted LO signal to this pin.

Logic-Level Enable for Transmitter Circuitry. A logic high turns on the transmitter. When TXEN

and RXEN are both at a logic high, the part is placed in standby mode, with a 160µA (typical)

supply current. If TXEN and RXEN are both at a logic low, the part is set to shutdown mode, with

a 0.1µA (typical) supply current.

Gain-Control Input for PA Driver. By applying an analog control voltage between 0V and 2.15V, the

gain of the PA driver can be adjusted over a 35dB range. Connect to VCC for maximum gain.

Power Amplifier Driver Output. AC couple to this pin. Use external shunt inductor to VCC to match

PADROUT to 50Ω. This also provides DC bias. See the Typical Operating Characteristics for a

plot of PADROUT Impedance vs. Frequency.

PA Driver Input Grounds. Connect GND to the PC board ground plane with minimal inductance.

RF Input to Variable-Gain Power Amplifier Driver. Internally matched to 50Ω. AC couple to this

pin. This input typically provides a 2:1 VSWR at 1.9GHz. AC couple to this pin. See the Typical

Operating Characteristics for a plot of PADRIN Impedance vs. Frequency.

RF Output of Transmit Mixer (upconverter). Use an external shunt inductor to VCC as part of a

matching network to 50Ω. This also provides DC bias. AC couple to this pin. See the Typical

Operating Characteristics for a plot of TXMXOUT Impedance vs. Frequency.

Differential IF Port of Transmit (Tx) and Receive (Rx) Mixers, Inverting Side. In Rx mode, this output

is an open collector and should be pulled up to VCC with an inductor. This inductor can be part of

the matching network to the desired IF impedance in both Tx and Rx modes. Additionally, a resistor

may be placed across IF and IF to set a terminating impedance. In Tx mode, this input is internally

AC-coupled; however, AC couple to this pin externally. For single-ended operation, connect this

port to VCC and bypass with 1000pF capacitor to GND.

Differential IF Port of Tx and Rx Mixers, Noninverting Side. In Rx mode, this output is an open collec-

tor and should be pulled up to VCC with an inductor. This inductor can be part of the matching net-

work to the desired IF impedance in both Tx and Rx modes. Additionally, a resistor may be placed

across IF and IF to set a terminating impedance. In Tx mode, this input is internally AC coupled;

however, AC couple to this pin externally.

8 _______________________________________________________________________________________

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