that1570 THAT Corporation, that1570 Datasheet - Page 9

• Manufacturer Part Number: that1570
• Description: Low-noise, Differential Audio Preamplifier Ic
• Manufacturer: THAT Corporation

THAT1570 Low-Noise
Differential Audio Preamplifier
Common-mode inputs are presented at the output,
along with the common-mode dc offset of -610 mV. If
these common-mode signals are not removed, they
may limit dynamic range of subsequent stages.
THAT1246 is a self-contained differential amplifier
which offers a convenient way to remove common
mode offset, convert to single-ended, and match the
headroom of the 1570 output to a single-ended drive.
A dual version of this part, the 1280, and low cost
versions (1250 single and 1290 dual) are also
IN+
IN-
If
a
Figure 8. 1570 Typical Phantom Power Application Circuit With Dual-Gang Pot for Gain Control, AC-Coupled R
PROTECTION
single-ended
C1
22p
C2
22p
RFI
220p
C3
PHANTOM POWER
6k81
R5
+48V
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
R6
6k81
output
+
+
47u
47u
C4
C5
Copyright © 2009, THAT Corporation; All rights reserved.
R4
10
PHANTOM POWER
R3
10
is
PROTECTION
+15V
-15V
FAULT
desired,
D3
S1DB
D4
S1DB
S1DB
S1DB
D1
D2
+15V
-15V
the
1k2
R2
Page 9 of 12
1k2
R1
PROTECTION
C6
100p
5%
C7
100p
5%
RFI
available. See Design Note 140, “Input and Output
Circuits for THAT Preamplifier ICs” for further ideas.
it possible to drive A/D converters through resistive
attenuators in low-cost applications. (However, in
order to provide common mode rejection and to
improve distortion performance, THAT recommends
active designs to drive high-performance A/D convert-
ers. In addition to DN140, look for forthcoming
application notes that offer more ideas on this
subject.
220p
C8
The 1570 will drive loads as low as 2 kΩ, making
3300u
8.66
R
C
GF
G
1N4148
1N4148
R
R
GV1
GV2
D6
D5
5k
5k
CW
CW
THAT
1570
IN1
R
R
IN2
G
G
Document 600132 Rev 01
1
2
R
2k5
R
2k5
+15V
-15V
R10
Vcc
Vee
10k
A
R11
B
10k
100n
100n
C10
OUT1
OUT2
C9
G
OUT+
OUT-