THAT4305 Datasheet, PDF (3/20 Pages) List of Unclassifed Manufacturers – Pre-trimmed Analog Engine® IC

Document 600067 Rev 00
Parameter
Rectifier Balance
Timing Current
Filtering Time Constant
Output Tempco
Load Resistance
Capacitive Load
Electrical Characteristics (con’t)²
Symbol
Conditions
Min
Typ
Max
±7.5µA DC_IN
±1
±3
I_T
-
7.5
-
τ
3467 X C_TIME
∆E_O/∆T_CHIP
Ref T_CHIP = 27 ºC
-
+0.33
-
R_L
-250mV < V_OUTRMS< +250mV
2
C_L
150
Parameter
Package Characteristics
Symbol
Conditions
Min
Typ
Max
Surface Mount Package
Type
Thermal Resistance
θ_JC
Thermal Resistance
θ_JA
Environmental Regulation Compliance
Soldering Reflow Profile
See Fig. 23 for dimensions
16 Pin QSOP
SO package in ambient
105
SO package soldered to board
40
Complies with RoHS requirements
JEDEC JESD22-A113-D (250 ºC)
Page 3
Units
dB
µA
s
%/ºC
kΩ
pf
Units
ºC/W
ºC/W
VCA In
C5
100p
C2
10u
R4
6k8
R3
20k
+15V
11
Ec+ ⁹
Vcc
13
VCA In VCA Out
15
Gnd
Vee
Ec- ₈
6
12
R2
20k _C3
22p NPO
U2
Control Voltage
-15V U1A
THAT4305
RMS In ^C1
10u
VCA Out
U1B
THAT4305
R1
RMS In
5k1 ²
RMS Out
CT
5
+15V ⁴
C4
C_TIME
10u
RMS Out
R5
2k
10u
Figure 2. Simplified application circuit
Theory of Operation
The THAT 4305 Dynamics Processor combines
THAT Corporation's proven exponentially controlled
Blackmer™ Voltage-Controlled Amplifier (VCA) and
log-responding RMS-Level Detector building blocks
in a small package optimized for low cost designs.
The part is fabricated using a proprietary, fully com-
plementary, dielectric-isolation process. This pro-
cess produces very high-quality bipolar transistors
(both NPNs and PNPs) with unusually low collector-
substrate capacitances. The 4305 takes advantage of
these devices to deliver wide bandwidth and excel-
lent audio performance while consuming very low
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com