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PDF THAT1512 Data sheet ( Hoja de datos )
| Número de pieza | THAT1512 | |
| Descripción | Low Noise/ High Performance Microphone Preamplifier IC | |
| Fabricantes | ETC | |
| Logotipo |  |
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T H AT Corporation
FEATURES
· Excellent noise performance
through the entire gain range
· Exceptionally low THD+N over the
full audio bandwidth
· Low power consumption: 7mA typ.
· Wide bandwidth: 3MHz typ. @
G=1000 (THAT 1510)
· High Slew Rate: 28 V/ms @ G=10
and CL=50pF (THAT 1510)
· Wide Output Swing: ±13V typ. on
±15V supplies
· Gain adjustable from 1 to >1000
with a single external resistor
· Drop-in compatible with SSM-2017
(THAT 1510)
Low Noise, High Performance
Microphone Preamplifier IC
THAT 1510, 1512
APPLICATIONS
· Mixing Consoles
· Public Address Systems
· Analog and Digital Snakes
· Breakout Boxes for
Digital Systems
· Sonar
· Paging and Intercom systems
· Instrumentation
Description
The THAT 1510 and 1512 are high perfor-
mance audio preamplifiers suitable for micro-
phone preamp and bus summing applications.
The ICs are pin compatible with the Analog De-
vices SSM2017 in both the 8-pin DIP and
16-pin SOIC packages.
The THAT1512 follows a different gain
equation than the 1510, but exhibits signifi-
cantly lower noise at lower gain settings and is
recommended for new designs.
Designed from the ground up in THAT's
complementary bipolar, dielectric isolation
process, the THAT 1510 and 1512 improve on
existing integrated microphone preamps by of-
fering lower noise at low gains, better distor-
tion characteristics, lower power consumption,
higher slew rate and bandwidth, and increased
output voltage swing. The parts are fully pro-
tected against ESD on all critical pins, and reli-
ability is further enhanced by their reduced
power requirements.
In short, the THAT 1510 and 1512 provide
superior performance in a popular format at an
affordable price.
V+
-In
+In
RG1
RG2
V-
+1
+1
5k
5k
5k
(10k)
5k
-
+
5k
(10k)
5k
Figure 1. THAT 1510 / 1512 Equivalent Circuit Diagram
(THAT 1512 values shown in parentheses)
Pin Name
DIP
SO16
RG1
1
2
-In 2
4
+In 3
5
Out
V- 4
7
Ref 5
10
Out 6
11
V+ 7 13
RG2
8
15
Ref Table 1. 1510 / 1512 pin assignments
Gain Equation
G
=
1+
10kW
RG
G
=
0.5 +
5 kW
RG
DIP-8 SO16
1510P 1510S
1512P 1512S
Table 2. Ordering Information
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com
1 page  
600031 Rev. 7/23/02
Preliminary Information
Page 5
+48V
R6
6k8
In-
C4 R3
C1
470p
47u 51R
R1
1k
D3
1N5818
R5
6k8
C2
In+ 470p
C5 R4
D4
1N5818
47u
C3
47p
51R
R2
1k
D1
1N757
D5
1N5818
D6
1N5818
D2
1N757
+15
C6
2 -In
8 RG2
RG
100n
7
V+
Out
6
Out
Ref
1 RG1 V-
3 +In 4
5 U1
THAT 1510
C9
100n
-15
Figure 4. Typical 1510 / 1512 Circuit with Phantom Power
tempco of the internal resistors (±20 ppm/°C typi-
cal).
Noise Performance
Thoughtful design results in these devices having
significantly lower noise at low gains than similar IC
microphone preamps. At zero dB gain, equivalent in-
put noise of the THAT 1510 is 55 nV/ÖHz, nearly
6 dB better than competitive IC designs. The un-
usual topology of the THAT 1512 results in an equiv-
alent input noise of 34 nV/ÖHz at zero dB gain, which
makes it comparable to some of the better discrete
designs currently available. At 1 kHz, the equivalent
input noise for both devices is 1 nV/ÖHz at 60 dB
gain.
Inputs
Protection diodes are employed at all pins except
V+ and V- of the THAT 1510/1512. These diodes re-
duce the likelihood of accidental ESD/EOS damage to
the IC. Other diodes across the base-emitter junc-
tions of the input transistors prevent reverse bias of
these junctions and consequent degradation of their
noise performance.
The inputs of the THAT 1510 and1512's are float-
ing, so a dc bias connection is required to maintain
the inputs within the IC's input common-mode range.
Four different schemes are shown in Figures 2, 3, 4,
and 5. Note that the values of R1 and R2 in these fig-
ures should be kept small to minimize pickup of un-
wanted noise and interference. A value of 1 kW is
often used, since some microphones require a differ-
ential input impedance of this magnitude. Unfortu-
nately, one would usually desire a significantly higher
common mode input impedance to minimize the
common mode degradation caused by unbalanced
source impedances. Figure 5 shows a technique
which allows higher common mode input impedance
while maintaining a lower differential source imped-
ance.
Reference Terminal
The "Ref" pin provides the reference for the out-
put signal, and is normally connected to analog
ground. If necessary, the "Ref" pin can be used for
offset correction or DC level shifting. A non-zero ref-
erence source resistance will reduce the IC's com-
mon-mode rejection (CMR) by the ratio of
10 kW/RREF.
Phantom Power
Phantom power is required for condensor micro-
phones. A phantom power circuit is shown in Fig-
ure 4. Diodes D1 through D6 are necessary to
protect the THAT 1510/1512 from transient voltages
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com
5 Page | ||
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