5173N24-U THAT, 5173N24-U Datasheet - Page 13

• 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
signal. (This is most likely the case when using the
preamp as a line input.) The output of Figure 10
("To ADC Input") will see that large common-mode
input signal, along with a 9 dB attenuated version of
the differential input signal. If sufficiently large, the
common-mode signal can cause the converter to clip
prematurely, modulating the differential audio with
the common-mode signal. While this may only occur
in extreme use conditions, it may well be of concern.
which removes the common-mode signal (depending
on the matching of resistors R9 & R10, R11 & R13,
and R14 & R16) before it reaches the A/D converter
input. This circuit also provides a low-impedance
drive for the converter, recommended by many con-
verter makers for best distortion performance. The
novel configuration (after Brit) minimizes the noise
contribution of the second (lower) inverter, since it's
noise appears in common mode and not differentially
at the output.
the system will be determined by the matching of
resistors R9~R16, with some contribution at high
frequencies from the matching of C17 and C18. At
high gains, the CMRR of the output stage will be
boosted by the gain of the 1570/5173 circuitry that
precedes it.
RFI Protection (and Common-Mode
Rejection)
tection in two sections. Small capacitors (C
are used from the positive and negative signal inputs
In such cases, consider the circuit of Figure 11,
Note that in this case, at low gains the CMRR of
The circuits of Fig 8 through 11 include RFI pro-
Figure 11. 5173 and 1570 high-performance application for output to an A/D convertor.
THAT
5173
U1
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
13 9 8 7
To: Host
MCU
Copyright © 2012, THAT Corporation; All rights reserved.
6
18 17 16 15
Control
10
Logic
14
23
11
22
Servo
-
+
Vee
Vcc
1
+
-
and C
24
1
12
21
Switches
Page 13 of 20
with FET
Resistor
Network
2
)
5
4
2
3
19
THAT
1570
20
U2
10
7
6
15
to chassis ground, along with a larger capacitor (C
across the two inputs. These components should be
located as close as possible to the input signal con-
nector, and are intended to prevent RF from entering
the chassis of the device.
to the amplifier, and is intended to prevent any RF
picked up inside the unit from reaching the amplifier
input, where it might be rectified and cause audio-
band interference. This network consists of a pair of
larger capacitors (C
capacitor (C
vented from entering the unit, and none is generated
inside the unit, then these capacitors may be omitted
or reduced in value.
some consideration for common-mode rejection.
Unbalanced capacitance from either input line (IN+
or IN-) to ground can unbalance common-mode sig-
nals, converting them to differential signals, which
will be amplified along with the desired (differential)
signal. The differential amplifier in the above circuits
offers gain only to differential signals: common-mode
signal gain is always 0dB. Therefore, its common-
mode rejection is equal to the differential gain.
verted to differential ones, this common-mode rejec-
tion will prevail. Because they are relatively small,
differences in the values of C
to cause imbalance than the larger capacitors at C
and C
tors C
to ensure matching between their values. Note that C
Vcc
A second RF protection network is located close
The design of these networks was arrived at after
So long as common-mode signals are not con-
13
12
7
6
. For this reason, we recommend that capaci-
and C
3
2
8
) across the two input lines. If RF is pre-
7
should be at least 5% types, in order
6
and C
7
) to ground and one more
Document 600166 Rev 01
1
and C
2
are less likely
OUT+
OUT-
3
6
3
)