THAT2252 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – IC RMS-Level Detector

T H AT Corporation
FEATURES
· True RMS Response
· Wide Dynamic Range: >80 dB
· High Crest Factor: 8 (1 dB error)
· Wide Bandwidth: to > 20 kHz
· Logarithmic Output Scaling
· Low Cost: $2.20 in ’000s
· Single In-Line Package
· Matches 2180 and 2181 Series
VCAs
IC RMS-Level Detector
THAT 2252
APPLICATIONS
· Meters
· Spectrum Analyzers
· Compressors
· Expanders
· Oscillators
· Psychoacoustic Modeling
· Noise Measurement
Description
The THAT 2252 integrated-circuit rms-level detec-
tor is designed to convert an ac input current into a
dc output voltage. The output is proportional to the
log of the true rms value of the input signal. The
parts are housed in a space-efficient plastic 8-pin
single-in-line (SIP) package, and require minimal
support circuitry. Based on dbx technology and fab-
ricated in a super low-noise process, the 2252 com-
bines wide dynamic range with frequency response
to beyond 20 kHz. The logarithmic output is espe-
cially convenient for audio applications requiring
decibel-linear scaling. The integration time is ad-
justable via an external R/C pair. With some exter-
nal circuitry, response to dc is also possible.
BIAS
CURRENT
COMP
1
1
3
4
2
BIAS
CURRENT
COMP
2
+
V
-
PIN 1
MODEL NO.
8
THAT
HJ
7
5
6
N
E
B ^TYP.
G
M
F
L
K
D
I
C
A
ITEM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
MILLIMETERS
20.32 MAX.
1.1 MIN.
0.5 ± 0.1
0.25
2.54
1.27 MAX.
0.51 MIN.
5.08 MAX.
2.8 ± 0.2
5.75 MAX.
1.5 MAX.
0.25 +0.10 -0.04
3.2 ± 0.5
1.1 MIN.
INCHES
0.8 MAX.
0.043 MIN.
0.02 ± 0.004
0.01
0.1
0.05 MAX.
0.02 MIN.
0.2 MAX.
0.11 ± 0.008
0.227 MAX.
0.058 MAX.
0.01 +0.004 -0.002
0.126 ± 0.02
0.043 MIN.
Figure 1. 2252 Equivalent Circuit Diagram
Figure 2. 2252 Physical Outline
dbx is a registered trademark of Carillon Electronics Corporation
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com