Page 6
THAT 1510 / 1512 Microphone Preamplifier
Preliminary Information
+48V
+15
C6
R6
6k8
C4
-In
+In
100n
2
R3
-In
RG2
4R7
7
V+
8
D3
D1
47u
C1
R1
SB160
SB160
470p
Out
10k
6
R9
R5
RG
Out
2k7 6k8
Ref
5
C2
470p
D2
SB160
1
D4
SB160
RG1
3 +In
U1
THAT
1510/1512
V-
C5
47u
R4
4
4R7
C9
R2
10k
C3
47p
100n
+15
-15
-15
Figure 5. Preferred 1510 / 1512 Circuit with Multiple Phantom Power
that may occur when microphones are connected or
disconnected.
power supply rails. While this arrangement doesn't
keep the inputs inside the common mode range, it
has the advantage of working even when the power is
off. For further insights in to this subject, see The 48
Volt Phantom Menace, by Gary K. Hebert and Frank
W. Thomas, presented at the 110th AES Convention.
While figure 4 shows a protection scheme that re-
flects the current industry practice, a better solution
is shown in figure 5. Like figure 4, this circuit uses a
diode bridge (composed of very fast 1N5818s), but in
this case, the diodes are connected directly to the
Package Information
The THAT 1510 and 1512 are available in 8-pin
DIP and 16-pin SOIC packages. The package dimen-
sions are shown in Figures 6 and 7 while pinouts are
given in Table 1.
Figure 6. -P (8-pin DIP) version package outline
Figure 7. -S16 (16-pin SO) version package outline
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com
ETC [ ETC ]
