THAT1510 Datasheet, PDF (6/6 Pages) List of Unclassifed Manufacturers – Low Noise, High Performance Microphone Preamplifier IC

Page 6
THAT 1510 / 1512 Microphone Preamplifier
Preliminary Information
+48V
R6
6k8
-In
C4 _R3
C1
470p
47u ^4R7
D3
SB160
R9 R5
2k7 6k8
C2
D4
+In ^470p
C5 _R4
SB160
47u ^4R7
C3
47p
+15
+15
C6
D1
SB160
D2
SB160
-15
2
100n
-In
R1
8 _RG2
10k
RG
7
V+
6 ^Out
Out
1
RG1
Ref
V- 5
U1
3 +In
4
THAT
1510/1512
R2
C9
10k
100n
-15
Figure 5. Preferred 1510 / 1512 Circuit with Multiple Phantom Power
that may occur when microphones are connected or
disconnected.
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
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.
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: [phone]; Fax: [phone]; Web: www.thatcorp.com