5171N32-U THAT Corporation, 5171N32-U Datasheet - Page 14

• Manufacturer Part Number: 5171N32-U
• Description: Microphone Preamplifiers High-Perform Digital Pre-Amp Controller
• Manufacturer: THAT Corporation

Specifications of 5171N32-U

• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3 V to 17 V
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 8.3 mA
• Supply Voltage (max): 17 V
• Supply Voltage (min): 3 V
• Thd Plus Noise: 0.0003 %
• Available Set Gain: 13.6 dB to 68.6 dB
• Input Offset Voltage: +/- 1.5 mV
• Maximum Operating Temperature: + 85 C
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document 600133 Rev 04
Using the GPOs to Control Preamplifier
Functions
be used to control any binary state functions, they
are primarily intended to be used to control analog
functions associated with a preamplifier. Figure 9 is
a block diagram showing THAT 5171 GPO outputs
controlling typical preamp functions such as an input
pad (GPO0), mic/line switching (GPO1), signal polar-
ity (GPO2), and phantom power (GPO3). There are
many ways to control each of these functions, each
with its own tradeoffs. See Design Note 140 (“Input
and Output Circuits for THAT Preamplifier ICs”) for
basic circuit ideas on how to implement this control
using relays. Look for a forthcoming Design Note to
offer recommendations for solid-state control over
these functions.
While the General Purpose Outputs (GPOs) can
FROM
GPO
+
+
_
_
NPN SETS ADDRESS
1k5
100k
TO LOGIC 0
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
V RELAY
Figure 10. Output drivers polarity sets 5171 address during reset.
Copyright © 2010, THAT Corporation; All rights reserved.
NPN
Figure 9. GPO outputs control preamp functions.
TYPICAL
LOAD
Page 14 of 20
FROM
GPO
Driving Relays from GPOs
functions will be relays. Relays will generally require
a buffer to provide current to drive their coils with-
out excessively loading the 5171.
buffer suitable to drive relays, and a discrete PNP
buffer suitable to drive LEDs from the GPO outputs.
(Of course, an NPN could be used to light an Led and
a PNP to drive a relay, though the available voltage at
the GPO pins may make it easier to drive a relay
from an NPN driver.) Because the GPO pins are used
as inputs for the device's SPI address during reset,
the choice of buffer has an influence on the address
which the 5171 will assume following reset.
Frequently, the switches which control analog
Figure 10 provides examples of a discrete NPN
PNP SETS ADDRESS
11k5
100k
TO LOGIC 1
Digital Preamplifier Controller IC
PNP
THAT5171 High-Performance
3V3
TYPICAL
LOAD