5173N24-U THAT, 5173N24-U Datasheet - Page 11

• Manufacturer Part Number: 5173N24-U
• Description: Microphone Preamplifiers 36V, 100mA
• Manufacturer: THAT

Specifications of 5173N24-U

• Rohs: yes
• Common Mode Rejection Ratio (min): - 9 dB
• Input Offset Voltage: - 1.75 mV to + 1.75 mV
• Maximum Operating Temperature: + 85 C
• Package / Case: QFN-24
• Input Voltage Range (max): 3.6 V, 17 V
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3 V to 3.6 V, 4.75 V to 17 V
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 2 uA, 7.6 mA
• Supply Voltage - Max: 3.6 V, 17 V
• Supply Voltage - Min: 3 V, 4.75 V
• Thd Plus Noise: 0.001 %
• Voltage Gain Db: 60 dB

THAT5173
Audio Preamplifier Digital Controller IC
tion to virtually any discrete current-feedback differ-
ential preamplifier, the applications discussed herein
are exclusively based on use with the companion
THAT1570 IC. The circuit of Figure 8 shows the
most basic application of the 5173 and 1570 to form
a complete low-noise digitally-controlled microphone
preamplifier.
Gain Ranges in Basic Configurations
varies from 0 to 60dB in 3dB steps. For single-ended
analog outputs, the circuit of Figure 8 can be fol-
lowed by a differential-to-single-ended converter, as
shown in Figure 9.
rails, the maximum (differential) input signal level is
+26.8dBu, and the maximum (differential) output
signal level is +26.6dBu.
(+60dB), the maximum input signal level is -33dBu,
and the maximum output signal level remains
+26.6dBu. All these figures increase by a little over
1dB if the circuit is run from ±17V supplies.
care to select a low-noise opamp, and pay attention
to the noise generated by the impedances. The com-
ponent values shown in Figure 9 will largely preserve
While the 5173 is perfectly suitable for applica-
The circuit of Figure 8 offers differential gain that
At minimum gain (0dB) and with ±15V supply
When converting to single-ended signals, take
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
THAT
5173
U1
Copyright © 2012, THAT Corporation; All rights reserved.
At maximum
13 9 8 7
To: Host
Figure 8. 5173 and 1570 basic application circuit.
MCU
6
18 17 16 15
Control
10
Logic
Applications
14
gain
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Servo
-
+
Vcc
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+
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the
combination.
phone preamplifier must drive an analog-to-digital
converter. Most high-performance A/D converters
have differential inputs, and cannot accept differen-
tial signals greater than ~+8dBu. For such applica-
tions, the output of the mic preamp must be
attenuated to prevent overload of the A/D converter.
The circuit of Figure 10 shows one typical circuit,
using a simple resistive attenuator (R
The impedance levels of the attenuator are chosen to
minimize their self-generated voltage noise, and to
stay within the load limits of the amplifier which
drives them. Figure 10 assumes that the maximum
differential input to the A/D converter is +8dBu. For
higher (or lower) maximum input levels, or for differ-
ent supply voltages to the 1570 and 5173, scale the
attenuator accordingly, keeping its total impedance
(R
contribution of the U-pad can compromise the theo-
retical noise performance of the 1570/5173 combina-
tion at minimum gain. Moreover, the non-zero
impedance drive to the converter may increase dis-
tortion
impact of this impedance depends on the ADC.
Figure 10 is that it offers no attenuation of common-
signals. The 1570 has unity common-mode gain
24
9
For many applications, the output of the micro-
Note that one drawback of the circuit shown in
1
+ R
12
dynamic
21
with FET
Switches
Network
Resistor
10
with
+ R
5
4
11
2
) the same. Please note that the noise
high-performance
3
range
19
THAT
20
1570
U2
7
10
6
15
Vcc
of
13
12
the
Document 600166 Rev 01
3
2
1570
converters.
9
through R
and
5173
The
11
).