THAT1510P08-U THAT Corporation, THAT1510P08-U Datasheet - Page 5

• Manufacturer Part Number: THAT1510P08-U
• Description: IC, PRE-AMP, MICROPHONE, 1510, DIP8
• Manufacturer: THAT Corporation

Specifications of THAT1510P08-U

• Supply Voltage Range: ± 5V To ± 20V
• Operating Temperature Range: -40°C To +85°C
• Audio Ic Case Style: DIP
• No. Of Pins: 8
• Operating Temperature Max: 85°C
• Operating Temperature Min: -40°C
• Package /: RoHS Compliant
• Control / Process Application: Differential Low Noise Preamplifiers, Moving-Coil Transducer Amplifiers
• Rohs Compliant: Yes

THAT 1510/1512 Low-Noise
High Performance Audio Preamplifier
These diodes reduce the likelihood that accidental
electrostatic discharge (ESD) or electrical over stress
(EOS) will damage the ICs. Other diodes across the
base-emitter junctions of the input transistors
prevent excessive reverse biasing of these junctions
(which would degrade the noise performance of the
input devices).
input pins are connected only to the bases of their
respective input devices. For proper operation, the
bases must be provided a source of dc bias that will
maintain the inputs within the IC's input common-
mode range. Figure 3 shows the simplest approach;
dc bias is supplied via R
will minimize pickup of unwanted noise and interfer-
ence, as well as generate relatively little noise due to
input current noise in the 1510/1512. However, at
high gains, their inherent voltage noise, plus the
1510/1512's input current noise drawn across these
resistors, adds significantly to the noise at the
1510/1512's output.
Figure 3, the dc level at the output of the 1510/1512
will vary with gain. In most applications, the output
should be ac-coupled to the next stage. For applica-
tions where R
4. In revisions 0 and 1 of this data sheet, we recommended using Schottky diodes (1N5819 types) at D
quently, we discovered that the leakage of these diodes could cause problems with DC fluctuations (hence noise) at the 1510/1512 output. Upon further investigation, we
concluded that conventional rectifier diodes like the 1N4004 (the glass-passivated GP version) provide adequate protection and d o not introduce unacceptable leakage.
Additionally, 1N4004 diodes are much cheaper and more readily available than the Schottky types.
Since publishing revision 4, we determined that the internal reverse-bias diodes between the pins +In/R
certain conditions. Small-signal diodes (D
Other than the protection diodes, the 1510/1512
Because R
G
G
-In
is variable (via a pot or switched
+In
is dc coupled in the circuit of
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1
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
and R
C2
470p
5
C1
470p
47p
and D
C3
2
. At 1 kΩ each, they
6
) avoid this problem by appearing in parallel with the internal diodes, diverting excess current around the 1510/1512.
Copyright © 2009, THAT Corporation
Figure 3. Basic 1510 / 1512 Circuit
1k
R1
1k
R2
Page 5 of 8
RG
resistors) to allow gain adjustment, R
ac-coupled as shown in Figure 4. By adding C
series with R
and ½ for the 1512). This constrains the output dc
offset to just over +/-5 mV, and prevents it from
varying with gain. With this low offset, ac coupling of
the output is usually unnecessary.
low-frequency response at the smallest values of R
For 60 dB gain, R
For
C
other maximum gains or minimum frequencies, scale
C
Phantom Power
microphones. THAT recommends the circuit of
Figure 5 when phantom power is included
and D
through the 1510/1512 inputs when the circuit
inputs (-In and +In) are shorted to ground while
phantom power is turned on. This causes C
C
often generating transient currents of several amps.
R
-In
+In
RG1
G
G
5
RG2
3
=3,300 μF (1510), or C
and R
accordingly.
to discharge through other circuit components,
C
Phantom power is required for many condenser
a
G
1
1
+15
-15
~ D
must be large enough not to interfere with
- D
G2
4
V-
V+
-3
4
and -In/R
should be at least 10 Ω to limit destructive
to protect the 1510/1512 inputs against overloads. Subse -
6
100n
100n
Ref
are used to limit the current that flows
C6
G
C9
dB
, dc gain is fixed (at unity for the 1510,
G1
Out
may be damaged by phantom power faults under
G
point
=10 Ω (1510) or R
THAT
1510/1512
U1
of
G
Document 600031 Rev 07
=6,800 μF (1512). For
approximately
Out
G
=5 Ω (1512).
G
should be
4
. R
4
5
and/or
3
, R
G
Hz,
in
G
4
.
,