THAT1510 Datasheet, PDF (4/6 Pages) List of Unclassifed Manufacturers – Low Noise, High Performance Microphone Preamplifier IC

Page 4
THAT 1510 / 1512 Microphone Preamplifier
Preliminary Information
+15
C6
-In
2
100n
C1
470p
8 ^{-In 7}
R1
RG2 _V+
1k
RG
Out ^{6 Out}
C2
+In ^470p
Ref
1 _{RG1 V- 5} U1
3 _{+In 4}
THAT
1510/1512
C3
R2
47p
1k
C9
100n
-15
Figure 2. Basic 1510 / 1512 Circuit
Applications
Gain Setting
A single external resistor between the RG1 and
RG2 pins is all that is needed to set the gain of the
THAT 1510 / 1512, according to the formulae
for the 1510:
G
=
1
+
10kW
RG
or
RG
=
10 kW
G-1
for the 1512:
G
=
0.5 +
5 kW
RG
or
RG
=
5 kW
G - 0.5
For unity gain operation on the 1510, RG1 and
RG2 may be left open. RG should be set to 10kW in
the 1512. To avoid excess noise and ensure tempera-
ture stability, non-inductive wirewound or metal-film
resistors are recommended for RG.
Total gain accuracy will depend on both the toler-
ance on RG, and on the gain equation accuracy of the
THAT 1510/1512. Total gain drift will result from
the mismatch between the tempco of RG and the
-In
+In
+15
C6
2
100n
C1
470p
R1
1k
8 ^{-In 7}
RG2 _V+
U1
THAT 1510/1512
Out
C2
470p
RG
Out
Ref
6
1 _{RG1 V- 5}
3 _{+In 4}
C8
R3
R2
C3 _1k
47p
C9
100n
-15
100n
U2
2
6
3
353
510k
Figure 3. 1510 / 1512 Circuit with Output Offset Correction
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com