Waveform Considerations

The MAX4000/MAX4001/MAX4002 family of log amps

respond to voltage, not power, even though input levels

are specified in dBm. It is important to realize that input

signals with identical RMS power but unique waveforms

results in different log amp outputs.

Differing signal waveforms result in either an upward or

downward shift in the logarithmic intercept. However,

the logarithmic slope remains the same.

Layout Considerations

As with any RF circuit, the layout of the MAX4000/

MAX4001/MAX4002 circuits affects performance. Use a

short 50

Ω line at the input with multiple ground vias

along the length of the line. The input capacitor and

resistor should both be placed as close to the IC as

ble to the IC with multiple vias connecting the capacitor

to the ground plane. It is recommended that good RF

components be chosen for the desired operating fre-

quency range. Electrically isolate RF input from

other pins (especially SET) to maximize perfor-

mance at high frequencies (especially at the high

power levels of the MAX4002).

UCSP Reliability

The UCSP represents a unique package that greatly

reduces board space compared to other packages.

UCSP reliability is integrally linked to the user’s assem-

bly methods, circuit board material, and usage environ-

ment. The user should closely review these areas when

considering use of a UCSP. This form factor may not

perform equally to a packaged product through tradi-

tional mechanical reliability tests. Performance through

operating life test and moisture resistance remains

uncompromised as it is primarily determined by the

wafer fabrication process. Mechanical stress perform-

ance is a greater consideration for a UCSP. UCSP sol-

der joint contact integrity must be considered since the

package is attached through direct solder contact to

the user’s PC board. Testing done to characterize the

UCSP reliability performance shows that it is capable of

performing reliably through environmental stresses.

Results of environmental stress tests and additional

usage data and recommendations are detailed in the

UCSP application note, which can be found on Maxim’s

website, www.maxim-ic.com.

Chip Information

TRANSISTOR COUNT: 358

PROCESS: Bipolar

2.5GHz 45dB RF-Detecting Controllers

16

______________________________________________________________________________________

Pin Configurations

1

2

3

4

8

7

6

5

OUT

N.C.

GND

CLPF

A

123

B

C

SET

SHDN

RFIN

MAX4000

MAX4001

MAX4002

µMAX

TOP VIEW

RFIN

SET

CLPF

OUT

GND

SHDN

MAX4000

MAX4001

MAX4002

UCSP

TOP VIEW

(BUMPS ON BOTTOM)