that4315 THAT Corporation, that4315 Datasheet - Page 3

• Manufacturer Part Number: that4315
• Description: Pre-trimmed Low-voltage Low-power Analog Engine
• Manufacturer: THAT Corporation

Document 600065 Rev 04
THAT Corporation’s proven Voltage-Controlled Am-
plifier (VCA) and an RMS-Level Detector in a pack-
age optimized for low cost circuits. The part is
integrated using a proprietary, fully complementary,
dielectric-isolation process. This process produces
very high-quality bipolar transistors (both NPNs and
PNPs) with unusually low collector-substrate capaci-
tances. The 4315 takes advantage of these devices to
deliver wide bandwidth and excellent audio perfor-
mance while consuming very low current and oper-
ating over a wide range of power supply voltages.
and RMS Detector building blocks, the interested
Parameter
Timing Current
Filtering Time Constant
Output Tempco
Load Resistance
Capacitive Load
Vcc/2 Reference Divider
Reference Voltage
Voltage Divider Impedance
Performance as a Compander (through an encode-decode cycle)
Dynamic Range
Distortion
Frequency response
Parameter
Surface Mount Package
Type
Thermal Resistance
Thermal Resistance
Soldering Reflow Profile
The THAT 4315 Dynamics Processor combines
For details of the theory of operation of the VCA
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
-20 dB re: Max Signal
DE
Electrical Characteristics (con’t)
Symbol
Symbol
R
O
THD
V
q
q
A
/DT
R
C
I
REF
t
, R
JC
JA
T
L
L
CHIP
B
Package Characteristics
Copyright © 2009, THAT Corporation
(Max signal level) - (No Signal Output Noise)
Theory of Operation
See page 12 for pinout and dimensions
-250mV < V
SO package soldered to board
No Signal, No load on pin 7,
SO package in ambient
Ref T
20 Hz ~ 20 kHz
T
OUTRMS
V
V
CHIP
Conditions
Conditions
CC
f = 1 kHz
CC
CHIP
= +15 V
= +5 V
= 27 ºC
< +250mV, re:Vref
= 27 ºC
reader is referred to THAT Corporation’s data
sheets on the 2180-Series VCAs and the 2252 RMS
Level Detector. Theory of the interconnection of ex-
ponentially-controlled VCAs and log-responding level
detectors is covered in THAT Corporation’s applica-
tion note AN101A, The Mathematics of Log-Based
Dynamic Processors.
The VCA — in Brief
poration’s
log-antilog gain cell topology — The Blackmer VCA™
— as used in THAT 2180-Series IC VCAs. VCA sym-
metry is trimmed during wafer probe for minimum
distortion. No external adjustment is allowed.
The VCA in THAT 4315 is based on THAT Cor-
highly
Min
Min
2.4
2
-
-
-
-
3467 X C
16 Pin QSOP
2
JEDEC JESD22-A113-D (250 ºC)
successful
V
+0.33
± 1.5
TBD
TBD
0.15
Typ
120
Typ
7.5
2.5
CC
20
/2
TIME
Max
Max
150
2.6
-
-
-
-
complementary
%/ºC
ºC/W
ºC/W
Units
Units
Page 3
mA
kW
kW
dB
dB
pf
%
V
V
s