Specifications
DATA SHEET QF4A512
Rev D4, Dec 07 61 www.quickfiltertech.com
13. APPLICATION CIRCUITS
For more information please see Application note QFAN004 at http://www.quickfiltertech.com/html/app_notes.php
13.1 AC Coupled, Single-ended
Figure 14. Application Circuit – Single-ended, ac coupled
Table 20. Example resistor values for ac-coupled, single-ended
AC-coupled, singled-ended
Input level R1 - R8 value PGA setting
1V ptp 0k x2
3.3V ptp 6.5k x1
5V ptp 15k x1
10V ptp 40k x1
DRDY
C2
3.3uF
RESET
R3
0
CS
Input
(0 - 2V AC)
C14
0.1uF
0603
1V8
J3
BNC
1
2
R4
0
PGA x1
C7
3.3uF
3V3
R7
0
DOUT
R6
0
CH 1
C16
0.1uF
0603
C12
18 pF
0603
CH 4
C5
3.3uF
CH 3
TP1
1
C3
3.3uF
C9
0.1uF
0603
C10
0.1 uF
0603
CH 2
3V3
1V8
R2
0
C11
0.1 uF
0603
SCLK
R1
0
DIN
J2
BNC
1
2
AC Coupled
Single Ended
1V8
R8
0
R5
0
U1
QF4A512
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
23
22
24
25
26
27
28
29
30
31
32
A1N
A1P
A2N
A2P
A3N
A3P
A4N
A4P
DVDD18
DGND
DGND
CSN
DRDY/SEL
SDO
SDI
SCLK
RSTN
DGND
DVDD18
DVDD33
XVDD18
XOUT
XIN
XGND
PGND
PVDD18
AGND
AVDD18
AVDD18
AGND
AGND
AVDD33
C4
3.3uF
C8
3.3uF
C15
0.1uF
0603
1V8
C13
18 pF
0603
J4
BNC
1
2
C6
3.3uF
R9
1Meg
J1
BNC
1
2
X1
20.000 MHz
HCM49-20.000MABJT
1 2
C1
3.3uF
1V8
C17
0.1uF
0603