MAX2016ETI(2004) 查看數據表（PDF） - Maxim Integrated

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MAX2016ETI
(Rev.:2004)

LF-to-2.5GHz Dual Logarithmic Detector/Controller for Power, Gain, and VSWR Measurements

Maxim Integrated 

LF-to-2.5GHz Dual Logarithmic Detector/

Controller for Power, Gain, and VSWR Measurements

Pin Description

PIN

1, 28

2, 9, 12, 20

3, 4

5, 17

6

7

8

10

11

13, 14

15

16

18, 19

21, 22

23

24

25

26

27

EP

NAME

FUNCTION

FA1, FA2

External Capacitor Input. Connecting a capacitor between FA1 and FA2 sets the highpass cutoff

frequency corner for detector A (see the Input Highpass Filter section).

VCC

RFINA+, RFINA-

GND

COUTH

CSETH

COR

SETD

OUTD

Supply Voltage. Bypass with capacitors as specified in the Typical Application Circuit. Place

capacitors as close to each VCC as possible (see the Power-Supply Connections section).

Differential RF Inputs for Detector A. Requires external DC-blocking capacitors.

Ground. Connect to the printed circuit (PC) board ground plane.

High-Comparator Output

Threshold Input on High Comparator

Comparator OR Logic Output. Output of COUTH ORed with COUTL.

Set-Point Input for Gain Detector

DC Output Voltage Representing PRFINA - PRFINB. This output provides a DC voltage

proportional to the difference of the input RF powers on RFINA and RFINB.

FV2, FV1

CSETL

COUTL

RFINB-, RFINB+

Video-Filter Capacitor Inputs for OUTD

Threshold Set Input on Low Comparator

Low-Comparator Output

Differential RF Inputs for Detector B. Requires external DC-blocking capacitors.

FB1, FB2

External Capacitor Input. Connecting a capacitor between FB1 and FB2 sets the highpass cutoff

frequency corner for detector B (see the Input Highpass Filter section).

OUTB

SETB

REF

SETA

Detector B Output. This output provides a voltage proportional to the log of the input power on

differential inputs RFINB+ and RFINB- (RFINB).

Set-Point Input for Detector B

2V Reference Output

Set-Point Input for Detector A

OUTA

Detector A Output. This output provides a voltage proportional to the log of the input power on

differential inputs RFINA+ and RFINA- (RFINA).

GND

Exposed Paddle. EP must connect to the PC board ground plane.

Detailed Description

The MAX2016 dual logarithmic amplifier is designed for

a multitude of applications including dual-channel RF

power measurements, AGC control, gain/loss detection,

and VSWR monitoring. This device measures RF signals

ranging from low frequency to 2.5GHz, and operates

from a single 2.7V to 5.25V (using series resistor, R6)

power supply. As with its single-channel counterpart

(MAX2015), the MAX2016 provides unparalleled perfor-

mance with a high 80dB dynamic range at 100MHz and

exceptional accuracy over the extended temperature

and supply voltage ranges.

The MAX2016 uses a pair of logarithmic amplifiers to

detect and compare the power levels of two RF input

signals. The device subtracts one power level from the

other to provide a DC output voltage that is proportional

to the power difference (gain). The MAX2016 can also

measure the return loss/VSWR of an RF signal by moni-

toring the incident and reflected power levels associat-

ed with any given load.

A window detector is easily implemented by using the

on-chip comparators, OR gate, and 2V reference. This

combination of circuitry provides an automatic indica-

tion of when the measured gain is outside a program-

mable range. Alarm monitoring can thus be imple-

mented for detecting high-VSWR states (such as open

or shorted loads).

RF Inputs (RFINA and RFINB)

The MAX2016 has two differential RF inputs. The input

to detector A (RFINA) uses the two input ports RFINA+

and RFINA-, and the input to detector B (RFINB) uses

the two input ports RFINB+ and RFINB-.

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