that5171 THAT Corporation, that5171 Datasheet - Page 9

• Manufacturer Part Number: that5171
• Description: High-performance Digital Preamplifier Controller Ic
• Manufacturer: THAT Corporation

THAT5171 High-Performance
Digital Preamplifier Controller IC
(or lower) maximum input levels, or for different
supply voltages to the 1570 and 5171, scale the
attenuator accordingly, keeping its total impedance
(R
the A/D converter input (across R11) is -120.5dBu (in
a 20kHz bandwidth). This compromises the the-
oretical noise floor of the 1570/5171 (at minimum
9
+ R
10
+ R
11
) the same. In this circuit, the noise at
THAT
5171
THAT
5171
U1
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
U1
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
Figure 5. 5171/1570 low-cost application for output to an A/D convertor.
19 18 17 16
To: Host
19 18 17 16
To: Host
MCU
Figure 4. 5171/1570 typical application with single-ended output.
MCU
Copyright © 2009, THAT Corporation; All rights reserved.
15
26 25 24 23
15
Control
26 25 24 23
14
Logic
Control
14
Logic
22
22
32
13
32
31
13
Servo
21
31
+
-
Vcc
Vee
+
-
Servo
21
+
-
Vcc
Vee
29
+
-
20
Page 9 of 20
30
29
12
20
10
30
with FET
Switches
Network
Resistor
12
10
with FET
Switches
Network
Resistor
6
5
gain) by about 0.65dB. However, the non-zero imped-
ance drive to the converter may increase distortion
with high-performance converters. The impact of this
impedance depends on the ADC.
Figure 5 is that it offers no common-mode rejection.
The 1570 has unity common-mode gain regardless of
3
6
4
5
11
THAT
1570
Note that one drawback of the circuit shown in
3
U2
9
10
7
6
15
4
11
Vcc
THAT
1570
U2
9
7
10
6
15
Vcc
13
12
13
12
3
2
3
2
Document 600133 Rev 02
SUBSEQUENT
CIRCUITRY
ANALOG
TO