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PDF THAT1570 Data sheet ( Hoja de datos )

Número de pieza THAT1570
Descripción Audio Preamplifier IC
Fabricantes THAT 
Logotipo THAT Logotipo



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FEATURES
y Low Noise:
1 nV/Hz input noise (60 dB gain)
y Low THD+N:
0.0003% 30 dB gain
0.0008% @ 40 dB gain
y Low Current: 7.5 mA typ
y Wide Bandwidth: 4.2MHz @40dB gain
y High Slew Rate: 53 V/μs
y Wide Signal Swing: >28.7dBu
(±18V supplies)
y Gain adjustable from 0 to >60 dB
y Differential output
y Small 4 x 4mm QFN16 package
y Mates with THAT5171
Digital Preamplifier Controller IC
Low-Noise, Differential
Audio Preamplifier IC
THAT1570
APPLICATIONS
y Microphone Preamplifiers
y Digitally-Controlled Microphone
Preamplifiers
y Differential Low-Noise Preamplifiers
y Differential Summing Amplifiers
y Differential Variable-Gain Amplifiers
y Moving-Coil Transducer Amplifiers
y Line Input Stages
y Audio
y Sonar
y Instrumentation
Description
The THAT1570 is a versatile, high performance
current-feedback amplifier suitable for differential
microphone preamp and bus summing applications.
The IC comes in a small QFN package, which saves
PCB space over discrete and other integrated
solutions.
Gain is adjusted via three external resistors (RA,
RB, and RG), making it possible to optimize noise over
a wide range of gains. The 1570 supports the tradi-
tional approach to gain control (viz., THAT's 1510 or
1512) by fixing RA and RB, and varying RG to control
gain. However, the 1570 also supports varying all
three resistors simultaneously with a dual-gang poten-
tiometer or a switched resistor network. This flexible
approach enables the designer to optimize noise over a
wider range of gains than is possible with fixed RA and
RB.
The 1570's differential output simplifies connec-
tion to differential input devices such as A/D convert-
ers. The part operates from as little as ±5V up
through ±18V supplies. Running on ±18V supplies,
at unity gain, the part accepts >+28dBu input signals.
The 1570 is designed to mate perfectly with
THAT’s 5171 Digital Preamplifier Controller IC. The
part-pair comprises an optimized, digitally controlled
audio preamplifier.
Designed from the ground up in THAT's comple-
mentary bipolar dielectric-isolation process and
including laser-trimmed Si-Chrome thin-film resistors,
the 1570 improves on existing integrated microphone
preamps by offering more versatile gain configuration,
lower noise at low gains, higher slew rate, and lower
distortion.
Figure 1. THAT1570 Block Diagram
Pin Name
N/C*
OUT2
OUT1
N/C*
N/C*
Rg1
IN1
N/C*
N/C*
IN2
N/C*
V-
V+
N/C*
Rg2
N/C*
V-
QFN Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Thermal Pad
Table 1. Pin Assignments
* N/C pins should be left open and not connect to
other traces on the PCB.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation. Document 600132 Rev 03

1 page




THAT1570 pdf
THAT1570 Low-Noise
Differential Audio Preamplifier
Page 5 of 12
Document 600132 Rev 03
source impedance can easily spoil the noise of the
device. The 1kΩ resistors used at R1 and R2 in
Figure 2 provide a low source impedance for the
1570 even when the input is open, and provide a
2 kΩ (differential) load for the microphone. Higher
source impedances will increase noise seen (and
heard!) with open inputs.
One disadvantage of the single-pot approach is
that noise at low gains is dominated by the noise of
resistors RA and RB. For the circuit of Figure 2, the
equivalent input noise at 6 dB gain (the minimum pot
setting) is ~21.3 nV/Hz, or -108.3 dBu. Much lower
noise (~ 11.8 nV/Hz) can be achieved if RA and RB
are reduced to ~2.5 kΩ, but to achieve 60 dB gain,
this requires RG to be = 5 Ω. (This analysis also
assumes RGV = 5 kΩ.)
An alternative offered by the 1570 (and not by
preamps with internal RA and RB) is that all three
resistors may be varied at once. See the circuit of
Figure 3, which uses a dual-gang potentiometer as
the variable element.
In Figure 3, high gain occurs by decreasing RG
while simultaneously increasing RA and RB. The
advantage of this approach is that RA and RB will
naturally be lower for low gains, without requiring
such a low value for RG to achieve high gains. In this
circuit, 60 dB gain occurs with RG= 8.66 Ω, and EIN
is 1.1 nV/Hz, or -133.9 dBu with a zero ohm input
termination. With a 150 Ω input termination, the
EIN, dominated by the 150 Ω resistor, is 1.92 nV/Hz
or ~ -129 dBu.
This circuit’s minimum gain is 3dB, where RGV is
fully CCW. At this gain, the input-referred noise is
~13 nV/Hz, or -112.5 dBu with a shorted input, and
is essentially no different with a 150 Ω input termina-
tion. This is about 4.2 dB better than the circuit of
Figure 2 at its minimum gain (6dB). Note also that at
the minimum +3 dB gain and ±18 V rails, the circuit
of Figure 3 can accept up to +25.7 dBu input signals
without clipping. This offers more headroom than
the circuit of figure 2.
Of course, other minimum and maximum gains
can be accommodated by varying the resistors at RA,
RB, RGV, and RGF.
For variable-gain applications where gain
accuracy is important, THAT recommends using
discrete, switched resistors for RA, RB and RG. With
switched resistors, it becomes even easier to vary all
three resistors to optimize noise.
As with the circuit of Figure 2, RG in Figure 3 is
dc coupled. This means that the differential output
offset voltage will vary with gain. Also, if the wiper of
either half of the gain pot loses contact with the
element, gain, and output offset, will change
abruptly. R3 and R4 help this situation by minimizing
the change in dc offset generated by the 1570’s input
bias current (drawn across the combination of R3 in
parallel with the series combination of RA and part of
RA
2k5
R3
10k
+15V
THAT
1570
IN+ C9
100n
RGV1 5k
R1
1k0 RGF
CW
IN1
V+
RG1 OUT1
8.66
CW RG2 OUT2
IN-
RGV2 5k
V-
IN2
RFI
PROTECTION
R2
1k0
C10
-15V 100n
R4
10k
RB
2k5
Figure 3. 1570 Typical Application Circuit Using Dual-Gang Pot for Gain Control
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation; All rights reserved.
OUT+
OUT-

5 Page





THAT1570 arduino
THAT1570 Low-Noise
Differential Audio Preamplifier
Page 11 of 12
Document 600132 Rev 03
Package and Soldering Information
Package Characteristics
Parameter
Symbol
Conditions
Min Typ Max
Package Style
See Fig. 9 for dimensions
16 Pin QFN
Thermal Resistance
θJA
Environmental Regulation Compliance
QFN package soldered to board
110
Complies with July 21, 2011 RoHS 2 requirements
Soldering Reflow Profile
JEDEC JESD22-A113-D (250 ºC)
Moisture Sensitivity Level
MSL Above-referenced JEDEC soldering profile
1
Units
ºC/W
BOTTOM VIEW
8
J
I
9 12
D
13
K
5 16
4
E
C
1
F
Exposed
Thermal Pad
B
G
A
H
ITEM
A
B
C
D
E
F
G
H
I
J
K
MILLIMETERS
4.00 ± 0.10
4.00 ± 0.10
0.90 ± 0.05
0.30 ± 0.05
0.65 ± 0.05
0.40 ± 0.05
0.00 ~ 0.05
0.20 ± 0.05
2.60 ± 0.05
2.60 ± 0.05
C' 0.3 x 45°
INCHES
0.157 ± 0.004
0.157 ± 0.004
0.035 ± 0.002
0.012 ± 0.002
0.026 ± 0.002
0.016 ± 0.002
0.000 ~ 0.020
0.008 ± 0.002
0.102 ± 0.002
0.102 ± 0.002
C‘ 0.012 x 45°
Figure 9. QFN-16 Surface Mount Package
Package
16 pin QFN
Order Number
1570N16-U
Table 2. Ordering information
2.10 mm
(0.083”)
1.65 mm
(0.065”)
1.05 mm
(0.041”)
0.45 mm
(0.018”)
0
Hole: 0.254 mm (0.010”)
Pad: 0.30 mm (0.012”)
Figure 10. QFN-16 Thermal Solder Pad
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2015, THAT Corporation; All rights reserved.

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