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THAT1571 Datasheet Preview

THAT1571 Datasheet

High-Performance Digital Preamplifier Controller IC

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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




THAT

THAT1571 Datasheet Preview

THAT1571 Datasheet

High-Performance Digital Preamplifier Controller IC

No Preview Available !

Document 600133 Rev 08
Page 2 of 20
THAT5171 High-Performance
Digital Preamplifier Controller IC
Pin
Number
1
2
3
4
5
6
7
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
Thermal
Pad
Pin Name
NC
NC
RG1
IN1
IN2
RG2
NC
NC
VCC
AGND
VEE
DGND
VDD
TRC
RST'
CS'
SCLK
DIN
DOUT
DGND
VDD
BSY
GPO0
GPO1
GPO2
GPO3
NC
AGND
SCAP1
SCAP2
SOUT1
SOUT2
PAD
Pin Description
No Connect
No Connect
Attenuator Network Output 1 [Connects to preamplifier feedback 1 (RG1)]
Attenuator Network Input 1 [Connects to preamplifier output 1]
Attenuator Network Input 2 [Connects to preamplifier Output 2]
Attenuator Network Output 2 [Connects to preamplifier feedback Input 2 (RG2)]
No Connect
No Connect
Positive Analog Supply Voltage
Analog Ground Reference
Negative Analog Supply Voltage
Logic Ground Reference
Logic Positive Supply Voltage
R/C Timeout or External Clock Input
Reset Input (Active Low)
Chip Select Input (Active Low)
Serial Clock Input
Serial Data Input
Serial Data Output
Logic Ground Reference
Logic Positive Power Supply
Busy Output (Active High)
During Reset: SPI address bit 0 input; During run time: General Purpose Output 0
During Reset: SPI address bit 1 input; During run time: General Purpose Output 1
During Reset: SPI address bit 2 input; During run time: General Purpose Output 2
General Purpose Output 3
No Connect
Analog Ground Reference
DC Servo Capacitor Input 1
DC Servo Capacitor Input 2
DC Servo Output 1
DC Servo Output 2
Connected internally to Vee. Solder to PCB (optionally connect to Vee) for optimal
performance.
Table 1. Pin Assignments
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.


Part Number THAT1571
Description High-Performance Digital Preamplifier Controller IC
Maker THAT
Total Page 20 Pages
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