MAX2424EAI 查看數據表（PDF） - Maxim Integrated

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MAX2424EAI

900MHz Image-Reject Receivers with Transmit Mixer

Maxim Integrated 

900MHz Image-Reject Receiver

with Transmit Mixer

_________________________________________________Pin Description (continued)

PIN

NAME

FUNCTION

12

TXIN

Transmit Mixer’s Noninverting Baseband/IF Input. TXIN, TXIN form a high-impedance, differential input

port. See Figure 1.

13

TXIN

Transmit Mixer’s Inverting Baseband/IF Input. TXIN, TXIN form a high-impedance, differential input port.

See Figure 1.

14

CAP2

Transmit Bias Compensation Input. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND.

Do not make any other connections to this pin.

15

TXON

Drive TXON and VCOON with a logic high to enable the transmit IF variable-gain amplifier, upconverter

mixer, and PA predriver. See Power Management section.

16

RXON

Drive RXON and VCOON with a logic high to enable the LNA, receive mixer, and IF output buffer.

See Power Management section.

17

VCOON

Drive VCOON with a logic high to turn on the VCO, phase shifters, VCO buffers, and prescaler. To dis-

able the prescaler, leave the PREGND pin unconnected.

Drive DIV1 with a logic high to disable the divide-by-64/65 prescaler and connect the PREOUT pin

18

DIV1

directly to an oscillator buffer amplifier, which outputs -8dBm into a 50Ω load. Drive DIV1 low for divide-

by-64/65 operation. Drive this pin low when in shutdown to minimize shutdown current.

19

MOD

Modulus Control for the Divide-by-64/65 Prescaler. Drive MOD high for divide-by-64 mode. Drive MOD

low for divide-by-65 mode.

Ground connection for the Prescaler. Connect PREGND to ground for normal operation. Leave uncon-

20

PREGND nected to disable the prescaler and the output buffer. Connect MOD and DIV1 to ground and leave PRE-

OUT unconnected when disabling the prescaler.

Prescaler/Oscillator Buffer Output. In divide-by-64/65 mode (DIV1 = low), the output level is 500mVp-p

21

PREOUT into a high-impedance load. In divide-by-1 mode (DIV1 = high), this output delivers -8dBm into a 50Ω

load. AC couple to this pin.

22

VCC

Supply-Voltage Input for Prescaler. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND

(pin 20 recommended).

23

VCC

Supply-Voltage Input for VCO and Phase Shifters. Bypass with a 47pF low-inductance capacitor to GND

(pin 26 recommended).

24

TANK

Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using

an external oscillator.

25

TANK

Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using

an external oscillator.

26

GND

Ground Connection for VCO and Phase Shifters

27

GND

Ground (substrate)

28

GND

Ground Connection for Master Bias Cell

8 _______________________________________________________________________________________

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