1512P08-U THAT Corporation, 1512P08-U Datasheet - Page 6

• Manufacturer Part Number: 1512P08-U
• Description: Audio Amplifiers High-Perform. Audio Preamp 0dB DIP-8
• Manufacturer: THAT Corporation

Specifications of 1512P08-U

• Product: General Purpose Audio Amplifiers
• Available Set Gain: 0 dB to 70 dB
• Common Mode Rejection Ratio (min): 60 dB
• Thd Plus Noise: 0.001 %
• Operating Supply Voltage: +/- 5 V to +/- 20 V
• Supply Current: 6 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Audio Load Resistance: 2 KOhms
• Input Bias Current (max): 14 uA
• Input Offset Voltage: +/- 13 V
• Input Signal Type: Differential
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential
• Supply Voltage (max): +/- 20 V
• Supply Voltage (min): +/- 5 V
• Output Type: Differential
• Package / Case: PDIP-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document 600031 Rev 07
currents. (Higher values further limit current flow,
but introduce additional source impedance and
noise.) D
significantly exceeding the supply rails. D
steer currents around the input stage in the
1510/1512, preventing damage.
made large to minimize high-pass filtering of the
signal based upon the sum of the values of R
well, keeping their reactance low relative to the exter-
nal microphone's source impedance will avoid
increasing the effects of low-frequency current noise
in the 1510/1512 input stage.
many pro audio products include, a zener diode
arrangement connected to the bridge rectifier instead
of the connection to V+ and V- as shown in Figure 5.
THAT does not recommend this approach, because
we find that R
(e.g., ≥ 51 Ω) in order to limit peak currents enough
to protect reasonably sized zener diodes (eg. 1/2 W).
Such large series input resistors will limit the noise
performance of the preamp. The ultimate floor is set
by the impedance of the microphone, but any
additional
performance.
Audio Engineering Society preprints "The 48 Volt
Phantom Menace," by Gary K. Hebert and Frank W.
The series combination of C
Other manufacturers have recommended, and
For further insights into this subject, see the
1
through D
series
3
and R
-In
+In
resistance
4
4
prevent the IC’s inputs from
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
must be made much larger
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
C2
470p
C1
470p
47p
C3
4
Figure 4. Basic 1510 / 1512 Circuit with Variable Gain
further
and C
Copyright © 2009, THAT Corporation
5
1k
R1
should be
5
degrades
1
+R
and D
1k
R2
2
. As
6
Page 6 of 8
RG
CG
Thomas, presented at the 110th AES Convention and
“The 48 Volt Phantom Menace Returns”, by Rosal-
fonso Bortoni and Wayne Kirkwood presented at the
127th AES Convention.
Impedance and Line Input Configurations
desirable (compared with that of Figures 3 and 4)
when input coupling capacitors (C
to block phantom power. At low frequencies where
the reactance of C
(compared to the common-mode input impedances),
the two capacitors interact with the common-mode
input impedance (seen looking to the right-side of
both
common-mode signals. Differences in the two capaci-
tors' values leads to different voltage dividers, spoil-
ing the low-frequency common-mode rejection of the
stage. Since C
types, precise matching is difficult and expensive to
achieve.
reduces the matching requirement by decreasing the
frequency at which the capacitive reactance becomes
significant inversely with the common-mode input
impedance.
Figure 5 accommodates this objective. In this circuit,
R
ing
-In
1
+In
RG1
RG2
and R
A higher common-mode input impedance is
The "T-bias" circuit (R
the
capacitors)
+15
-15
2
V-
V+
High
are connected to a third resistor R
low-frequency
100n
100n
Ref
C6
C9
4
and C
High Performance Audio Preamplifier IC
common-mode
Out
to
5
4
THAT
1510/1512
U1
are generally large, electrolytic
and C
form
THAT 1510/1512 Low-Noise
1
common
, R
Out
5
voltage
2
, and R
become significant
4
input
and C
mode
dividers
7
) shown in
5
impedance
) are used
7
, boost-
input
for