THAT2252 THAT, THAT2252 Datasheet

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THAT2252

Manufacturer Part Number
THAT2252
Description
IC RMS-Level Detector
Manufacturer
THAT
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
THAT2252
Manufacturer:
THATCORP
Quantity:
20 000
T H A T
CURRENT
1
3
4
2
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-
COMP
BIAS
The THAT 2252 integrated-circuit rms-level detec-
1
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
Figure 1. 2252 Equivalent Circuit Diagram
FEATURES
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
C o r p o r a t i o n
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
dbx is a registered trademark of Carillon Electronics Corporation
V
CURRENT
+
-
COMP
BIAS
2
Description
6
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.
8
7
5
Meters
Spectrum Analyzers
Compressors
Expanders
Oscillators
Psychoacoustic Modeling
Noise Measurement
APPLICATIONS
PIN 1
Figure 2. 2252 Physical Outline
IC RMS-Level Detector
ITEM
N
B
C
D
E
G
H
K
M
N
A
F
J
L
THAT
I
B
D
C
A
TYP.
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.
MILLIMETERS
1.5 MAX.
0.25 +0.10 -0.04
3.2 ± 0.5
1.1 MIN.
E
THAT 2252
MODEL NO.
H
F
G
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.
J
M
L
K
I

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THAT2252 Summary of contents

Page 1

... Figure 1. 2252 Equivalent Circuit Diagram dbx is a registered trademark of Carillon Electronics Corporation THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com IC RMS-Level Detector APPLICATIONS Meters Spectrum Analyzers Compressors Expanders Oscillators ...

Page 2

... V A minimum ripple at V with out in RMS THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com SPECIFICATIONS 1 +18 V Power Dissipation (PD) -18 V Operating Temperature Range (TOP Storage Temperature Range (TST) ...

Page 3

... Q1 4 THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Theory of Operation reverses the positive input currents so that they add to the negative input currents in Q4. The cur- rent in Q4, therefore, is equal to the absolute value of the input current ...

Page 4

... V- Rf Figure 4. Typical Application Circuit ( 15V) THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com the bias current I in the input current I charge the capacitor C square of the short-term increase in input current. ...

Page 5

... Figure 6. 2252 DC Output Vs. AC Input Level THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Output Buffering and Level Shifting The voltage at pin 6 is buffered by OA3, and level shifted down by the bias voltage V3. Level shifting ...

Page 6

... OA2 and prevents the current in Q4 and Q5 from re- versing. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Rf is responsible for the flattening of the low-level response shown in Figure 6 (Page is the negative back current provided enforces a lower limit to the resolvable input current ...

Page 7

... The appli- THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Applications cation circuits in Figure 4 (page 4) and Figure 11 (page 6) are typical. ...

Page 8

... T PC board ground and voltage supply system for THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com good results. The application circuits show resistor in series with the positive supply pin (pin 8), and capacitor bypassing this pin to ground ...

Page 9

... THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com SYM 50k V+ IN Cin 20u Figure 11 ...

Page 10

... USA [(814)-362-5536]. Figure 13 shows a typical circuit. For good results, R1 should be lo- THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com cated physically close to the 2252 to optimize temperature tracking. Unusual Applications ...

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