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THAT1570 Datasheet Preview

THAT1570 Datasheet

Audio Preamplifier IC

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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




THAT

THAT1570 Datasheet Preview

THAT1570 Datasheet

Audio Preamplifier IC

No Preview Available !

Document 600132 Rev 03
Page 2 of 12
THAT1570 Low-Noise
Differential Audio Preamplifier IC
SPECIFICATIONS1
Absolute Maximum Ratings2,3
Supply Voltage (V+) - (V-)
Maximum Input Voltage (VIMax)
Storage Temperature Range (TSTG)
40 V
V+ to V-
-40 to +125 ºC
Operating Temperature Range (TOP)
Output Short-Circuit Duration (tSH)
Junction Temperature (TJMAX)
-40 to +85 ºC
Continuous
+125 ºC
Parameter
Power Supply
Supply Voltage
Supply Current
Electrical Characteristics2,4,5
Symbol
Conditions
Min Typ Max
V+; -(V-)
I+; -(I-)
Referenced to GND
No Signal
5 18
7.5 10
Units
V
mA
Input Characteristics
Input Bias Current
Input Offset Current
IB No signal; either input connected to GND 6.4 22
IB-OFF
No signal;
-2.2 +2.2
Differential Input Offset Voltage
VOS No signal, Inputs connected to GND
0 dB gain
-5.25 +5.25
+60 dB gain
-255 +255
Input Common Mode Voltage Range VIN_CM
Common Mode
(V-) + 4 (V+) - 4
Input Impedance
ZIN_DIFF
Maximum Differential Input Level
ZIN_CM
VIN-BAL
Differential
20 dB gain
40 dB gain
60 dB gain
Common Mode
All gains
RG =
58||1
58||3.5
57||28.7
29.4||1.4
26.8
μA
μA
mV
μV
V
MΩ||pF
MΩ||pF
MΩ||pF
MΩ||pF
dBu
Output Characteristics
Total Differential Output Offset
G = gain
-(5+0.25*G) (5+0.25*G)
Common Mode Output Voltage
VOSCM No signal; IN1, IN2 connected to GND
-610
Maximum Single Output Voltage
Differential Short Circuit Current
Maximum Capacitive Load
VOUT-SINGLE
RL= 2 kΩ
ISC RL = 0 Ω; Cold start
RL = 0 Ω; Continuous
CL MAX
Over entire temperature range
Stable operation 50% overshoot
(V-) + 2.4
± 42
± 28
400
(V+) - 1.4
100
Maximum Differential Output Level VOUT
RL= 2 kΩ
26.6
mV
mV
V
mA
mA
pF
pF
dBu
1. All specifications are subject to change without notice.
2. Unless otherwise noted, TA = 25ºC, V+ = +15V, V- = -15V.
3. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only; the functional operation of
the device at these or any other conditions above those indicated in the operational sections of this specification is not impli ed. Exposure to absolute maximum rating condi-
tions for extended periods may affect device reliability.
4. 0 dBu = 0.775 Vrms
5. Unless otherwise noted, RA = RB = 2.21 kΩ; CL = 10 pF
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.


Part Number THAT1570
Description Audio Preamplifier IC
Maker THAT
Total Page 12 Pages
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