TL441EP

LOGARITHMIC AMPLIFIER

SGLS268 − OCTOBER 2004

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D Controlled Baseline

− One Assembly/Test Site, One Fabrication

Site

D Extended Temperature Performance of

−55

°C to 125°C

D Enhanced Diminishing Manufacturing

Sources (DMS) Support

D Enhanced Product-Change Notification

D Qualification Pedigree†

D Excellent Dynamic Range

D Wide Bandwidth

D Built-In Temperature Compensation

D Log Linearity (30-dB Sections) ...1 dB Typ

D Wide Input Voltage Range

† Component qualification in accordance with JEDEC and industry

standards to ensure reliable operation over an extended

temperature range. This includes, but is not limited to, Highly

Accelerated Stress Test (HAST) or biased 85/85, temperature

cycle, autoclave or unbiased HAST, electromigration, bond

intermetallic life, and mold compound life. Such qualification

testing should not be viewed as justifying use of this component

beyond specified performance and environmental limits.

DESCRIPTION

This amplifier circuit contains four 30-dB logarithmic stages. Gain in each stage is such that the output of each

stage is proportional to the logarithm of the input voltage over the 30-dB input voltage range. Each half of the

circuit contains two of these 30-dB stages summed together in one differential output that is proportional to the

sum of the logarithms of the input voltages of the two stages. The four stages may be interconnected to obtain

a theoretical input voltage range of 120-dB. In practice, this permits the input voltage range typically to be greater

than 80-dB with log linearity of

±0.5-dB (see application data). Bandwidth is from dc to 40 MHz.

This circuit is useful in data compression and analog compensation. This logarithmic amplifier is used in log IF

circuitry as well as video and log amplifiers.

The TL441M is characterized for operation over the full military temperature range of −55

°C to 125°C.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

−55

°C to 125°C

SOP (NS)

Tape and reel

TL441MNSREP

TL441MEP

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines

are available at www.ti.com/sc/package.

Copyright

 2004, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CA2

VCC −

CA2′

A1

Y

Y

A2

VCC +

NC

CB2

CB2′

GND

B1

Z

Z

B2

NS PACKAGE

(TOP VIEW)

NC — No internal connection

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.