Cirrus-logic CDB5374 Manuale Utente Scaricare il pdf (Pagina 33)

CDB5374

DS862DB1 33

arated into 4-wire INR+, INF+, INF-, INR- quad groups, and are routed with INF+ and INF- as a traditional

differential pair and INR+ and INR- as guard traces outside the respective INF+ and INF- traces.

2.5.3 Bypass Capacitors

Each device power supply pin includes 0.1 µF bypass capacitors placed as close as possible to the pin

on the back side of the PCB. Each power supply net includes at least 100 µF bulk capacitance as a charge

well for transient current loads.

Figure 5. Quad Group Routing

INR+

INF+

INF-

INR-

INR+

INF+

INF-

INR-

Figure 6. Bypass Capacitor Placement

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Features 1
General Description 1
REVISION HISTORY 2
TABLE OF CONTENTS 3
LIST OF FIGURES 4
LIST OF TABLES 4
1. INITIAL SETUP 5
1.1 Kit Contents 5
1.2 Hardware Setup 5
1.2.1 Default Jumper Settings 6
DS862DB1 9 9
10 DS862DB1 10
1.4 Self-testing CDB5374 11
1.4.1 Noise test 11
1.4.2 Distortion Test 12
DS862DB1 13 13
2.2 Analog Hardware 14
2.2.1 Analog Inputs 14
2.2.1.4 Input Protection 15
2.2.1.5 Input RC Filters 15
2.2.1.6 Common Mode Bias 15
2.2.2.1 GUARD Output 16
2.2.2.2 Analog Outputs - OUT 16
2.2.2.3 Anti-alias RC Filters 16
2.2.3.2 Offset Enable - OFST 17
2.2.4 Delta-Sigma Test DAC 18
2.2.5.2 Common Mode Bias 19
2.3 Digital Hardware 20
2.3.1 Digital Filter 20
DS862DB1 21 21
2.3.2 Interface CPLD 22
DS862DB1 23 23
24 DS862DB1 24
DS862DB1 25 25
2.3.5 Phase Locked Loop 26
Specification Value 27
8.192, 16.384, 32.768 MHz 27
2.3.6.1 CLK, SYNC 28
2.3.6.2 I 29
C - SCL, SDA, Bypass 29
2.3.8 External Connector 30
2.4 Power Supplies 30
DS862DB1 31 31
2.5 PCB Layout 32
2.5.1 Layer Stack 32
2.5.2 Differential Pairs 32
2.5.3 Bypass Capacitors 33
2.5.4 Dual Row Headers 34
3. SOFTWARE DESCRIPTION 35
3.1 Menu Bar 35
3.2 About Panel 36
3.3 Setup Panel 37
3.3.1 USB Port 38
3.3.2 Digital Filter 39
3.3.3 Analog Front End 40
3.3.4 Test Bit Stream 40
3.3.5 Gain/Offset 41
3.3.6 Data Capture 42
3.3.7 External Macros 43
• M1 = . /macros/m1.mac 43
• M2 = . /macros/m2.mac 43
3.4 Analysis Panel 44
3.4.1 Test Select 45
3.4.2 Statistics 46
3.4.3 Plot Enable 46
DS862DB1 47 47
3.5 Control Panel 48
3.5.1 DF Registers 49
3.5.2 DF Commands 49
3.5.3 SPI 49
3.5.4 Macros 50
3.5.5 GPIO 50
3.5.6 Customize 51
3.5.7 External Macros 51
4. BILL OF MATERIALS 52
CIRRUS LOGIC 53
CDB5374-Z_Rev_A.bom 53
5. LAYER PLOTS 54
DS862DB1 55 55
56 DS862DB1 56
DS862DB1 57 57
58 DS862DB1 58
DS862DB1 59 59
60 DS862DB1 60
DS862DB1 61 61
6. SCHEMATICS 62
DS862DB1 63 63
64 DS862DB1 64
DS862DB1 65 65
66 DS862DB1 66
DS862DB1 67 67
68 DS862DB1 68
DS862DB1 69 69
70 DS862DB1 70
DS862DB1 71 71
72 DS862DB1 72
DS862DB1 73 73
74 DS862DB1 74
DS862DB1 75 75
76 DS862DB1 76
DS862DB1 77 77
78 DS862DB1 78

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Cirrus-logic CDB5374 Manuale Utente Pagina 33

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