THAT1571 Datasheet PDF - THAT
Part Number | THAT1571 | |
Description | High-Performance Digital Preamplifier Controller IC | |
Manufacturers | THAT | |
Logo | ||
There is a preview and THAT1571 download ( pdf file ) link at the bottom of this page. Total 20 Pages |
Preview 1 page No Preview Available ! FEATURES
y Ideal mate for THAT1570 preamplifier
y Wide gain range:
– +13.6 to +68.6dB in 1dB steps, and
– +5.6dB
y Wide supply range: ±5V to ±17V
y Wide output swing:+27dBu (±17V sup.)
y Wide input swing: +22dBu (±17V sup.)
y Low THD+N: 0.0003% @ 22dB gain
y Integrated differential servo minimizes
output offset
y Zero-crossing detector minimizes
switching noise
y Flexible, addressable SPI interface
y Four general-purpose digital outputs
y Small 7mm x 7mm QFN32 package
High-Performance Digital
Preamplifier Controller IC
THAT 5171
APPLICATIONS
y Digitally controlled microphone
preamplifiers
y Digitally-controlled instrumentation
amplifiers
y Digitally-controlled differential
amplifiers
y Audio mixing consoles
y PC audio breakout boxes
y Audio distribution systems
y Digital audio snakes
y Portable audio recorders
Description
The THAT5171 is a digital gain controller for
low-noise, analog, differential, current-feedback
audio preamplifiers such as the THAT 1570.
When used in conjunction with an appropriate
analog gain block, the 5171 can set gain to
5.6dB, or any gain from 13.6dB to 68.6dB in 1dB
steps, while preserving low noise and distortion.
It operates from ±5V to ±17V supplies, support-
ing input signal levels as high as +22 dBu (at
5.6dB gain, and ±17V supplies) in combination
with the 1570 (without an external input pad).
The 5171 includes a differential servo and zero-
crossing detector to minimize dc offsets and
glitches (zipper noise) during gain adjustments.
The 5171 is controlled via an addressable
serial-peripheral interface (SPI) port. Four Gen-
eral Purpose Outputs (GPOs) can be controlled
via this interface. The GPOs may be connected to
input pads, analog switches, mute circuits, LEDs,
etc. The SPI bus supports read-back so that host
software can verify proper operation.
The 5171 was designed to mate perfectly with
the THAT 1570 Differential Audio Preamplifier
IC. Together, these two ICs provide a best-of-
class solution for digitally-controllable audio pre-
amplifier applications. However, for designers
who prefer a more customized solution, the 5171
may also be used to control a discrete preampli-
fier.
Fabricated in a high-voltage CMOS process,
the 5171 integrates an astonishing amount of cir-
cuitry within a very small package. It comes in a
small (7x7 mm) 32-pin QFN package, making it
suitable for small portable devices.
Figure 1. THAT 5171 Block Diagram
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2014, THAT Corporation Document 600133 Rev 08
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THAT5171 High-Performance
Digital Preamplifier Controller IC
Page 5 of 20
Document 600133 Rev 08
Theory of Operation
The THAT 5171 is a gain controller in the form of
a digitally controlled differential attenuator; it is not
an amplifier. It contains a set of precision resistors,
switched by a set of CMOS FET switches, configured
to create a variable, switched, differential attenuation
network. The network’s impedances are ideal for
controlling gain in low-voltage-noise, current-feed-
back instrumentation amplifiers, and are optimized
for low source impedance applications. For example,
when coupled with a low-noise gain stage like the
THAT 1570, it maintains 1.5nV/√Hz noise floor at
68.6dB gain in the complete circuit.
Using the 5171
The attenuator is intended primarily for use in
the feedback loop of differential current-feedback
gain stages, such as the THAT 1570. Designed spe-
cifically for use in high-performance microphone pre-
amplifiers, THAT’s engineers paid careful attention
to precision, stability, and control over the resistors
and their switches, in order to maintain excellent
audio performance over a wide range of gains and
signal levels.
U1
THAT5171
U2
THAT1570
Figure 2. Analog portion of 5171 connected to a 1570.
Figure 2 shows the analog portion of the 5171
connected to a 1570. Resistors RA, RB, and RG form a
differential attenuator (“U-pad”). The 1570’s differen-
tial output is applied to RA and RB. The output of the
attenuator, appearing across RG, is connected to the
inverting differential input of the dual current-
feedback amplifiers in the 1570 (the RG1 and RG2
pins). The voltage divider ratio thus controls the dif-
ferential gain of the circuit.
The 5171 changes the attenuator settings based
on the gain command provided via the SPI control
interface. At minimum gain, RG is ~7.93kΩ, while
RA = RB = ~3.56kΩ, which sets the circuit gain to
+5.6dB. To achieve other gains, all three resistors
are varied by CMOS switches in order to produce
1dB gain steps from +13.6 to +68.5dB. At all gains,
the impedance levels are chosen to minimize noise
and distortion within the circuit as a whole.
Table 2 lists the typical internal attenuator resis-
tor values for each gain setting.
Gain
Setting
5.6
13.6
14.6
15.6
16.6
17.6
18.6
19.6
20.6
21.6
22.6
23.6
24.6
25.6
26.6
27.6
28.6
29.6
30.6
31.6
32.6
33.6
34.6
35.6
36.6
37.6
38.6
39.6
40.6
41.6
42.6
43.6
44.6
45.6
46.6
47.6
48.6
49.6
50.6
51.6
52.6
53.6
54.6
55.6
56.6
57.6
58.6
59.6
60.6
61.6
62.6
63.6
64.6
65.6
66.6
67.6
68.6
Rg
(ohms)
7.9k
1.4k
1.4k
1.4k
1.4k
1.4k
1.4k
1.4k
1.4k
560
560
560
560
560
560
560
560
220
220
220
220
220
220
220
220
89
89
89
89
89
89
89
89
35
35
35
35
35
35
35
35
14
14
14
14
14
14
14
14
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
Ra, Rb
(ohms)
3.6k
2.7k
3.1k
3.5k
4.0k
4.6k
5.3k
6.0k
6.8k
3.1k
3.5k
3.9k
4.5k
5.0k
5.7k
6.4k
7.2k
3.2k
3.7k
4.1k
4.6k
5.2k
5.9k
6.6k
7.4k
3.3k
3.7k
4.2k
4.7k
5.3k
5.9k
6.7k
7.5k
3.3k
3.8k
4.2k
4.7k
5.3k
6.0k
6.7k
7.5k
3.4k
3.8k
4.2k
4.7k
5.3k
6.0k
6.7k
7.5k
3.4k
3.8k
4.2k
4.7k
5.3k
6.0k
6.7k
7.5k
“Gain”
Register
0
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Table 2. Internal attenuator resistor values.
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Copyright © 2014, THAT Corporation; All rights reserved.
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THAT1571 | The function is High-Performance Digital Preamplifier Controller IC. THAT | |
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