TL441CN Datasheet, PDF (1/20 Pages) Texas Instruments – LOGARITHMIC AMPLIFIER

TL441
LOGARITHMIC AMPLIFIER
SLVS328 – OCTOBER 2000
D Excellent Dynamic Range
D Wide Bandwidth
N PACKAGE
(TOP VIEW)
D Built-In Temperature Compensation
D Log Linearity (30-dB Sections) . . . 1 dB Typ
D Wide Input Voltage Range
C_A2 1
V_{CC –} 2
C_A2′ 3
A1 4
16 NC
15 C_B2
14 C_B2′
13 GND
description
Y5
12 B1
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
Y6
A2 7
V_{CC +} 8
11 Z
10 Z
9 B2
logarithm of the input voltage over the 30-dB input
voltage range. Each half of the circuit contains two
NC — No internal connection
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 TL441 is characterized for operation over 0°C to 70°C.
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.
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 2000, Texas Instruments Incorporated
1