Cirrus-logic CDB5374 Manual de usuario Pagina 16
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CDB5374
16 DS862DB1
2.2.2 Differential Amplifiers
The CS5374 amplifiers act as a low-noise gain stage for internal or external differential analog signals.
2.2.2.1 GUARD Output
The CDB5374 hydrophone amplifiers are not chopper stabilized (with 1/f noise typically buried below the
low-frequency ocean noise) to achieve very high input impedance. To minimize leakage from high-imped-
ance sensors connected to the CS5374 amplifier, a GUARD signal output can actively drive a sensor ca-
ble shield with the common mode voltage of the sensor signal.
2.2.2.2 Analog Outputs - OUT
The analog outputs of the CS5374 differential amplifiers are externally split into rough-charge and fine-
charge signals for input to the ∆Σ modulators. Analog signal traces out of the CS5374 amplifiers and into
the modulators are 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- trac-
es.
2.2.2.3 Anti-alias RC Filters
The CS5374 ∆Σ modulator is 4th order and high-frequency input signals can cause instability. Simple sin-
gle-pole anti-alias RC filters are required between the amplifier outputs and the modulator inputs to band-
width limit analog signals into the modulator.
Analog Signals Description
INA Sensor analog input
INB Test DAC analog input
OUT Analog outputs
GUARD Amplifier guard output
Digital Signals Description
MUX[0..1] Input mux selection (register bits)
GAIN[0..2] Gain range selection (register bits)
PWDN Power down mode enable (register bit)
Figure 2. RC Filter External Components
INR+
INF+
INF-
INR-
INR+
INF+
INF-
INR-
- 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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