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ADC3683 Datasheet(PDF) 49 Page - Texas Instruments

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No. de pieza ADC3683
Descripción Electrónicos  ADC3683-SP Space Grade 18-Bit 1 to 65MSPS, Low Noise, Ultra-low Power Dual Channel ADC
PDF  70 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

ADC3683 Datasheet(HTML) 49 Page - Texas Instruments

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DC/DC
Regulator
5V-12V
LDO
GND
GND
AVDD
IOVDD
FB
FB
FB
47uF
47uF
10uF 10uF
0.1uF
10uF 10uF
0.1uF
2.1V
1.8V
FB = Ferrite bead filter
GND
GND
Figure 8-8. Example: LDO Linear Regulator Approach
DC/DC
Regulator
5V-12V
GND
GND
AVDD
IOVDD
EMI FILTER
FB
FB
10uF 10uF
0.1uF
10uF 10uF
0.1uF
1.8V
GND
10uF 10uF 10uF
Ripple filter notch frequency to match switching frequency of the DC/DC regulator
FB = Ferrite bead filter
Figure 8-9. Example Switcher-Only Approach
8.5 Layout
8.5.1 Layout Guidelines
There are several critical signals which require specific care during board design:
1. Analog input and clock signals
• Traces should be as short as possible and vias should be avoided where possible to minimize impedance
discontinuities.
• Traces should be routed using loosely coupled 100Ω differential traces.
• Differential trace lengths should be matched as close as possible to minimize phase imbalance and HD2
degradation.
2. Digital output interface
• Traces should be routed using tightly coupled 100Ω differential traces.
3. Voltage reference
• The bypass capacitor should be placed as close to the device pins as possible and connected between
VREF and REFGND – on top layer avoiding vias.
• Depending on configuration an additional bypass capacitor between REFBUF and REFGND may be
recommended and should also be placed as close to pins as possible on top layer.
4. Power and ground connections
• Provide low resistance connection paths to all power and ground pins.
• Use power and ground planes instead of traces.
• Avoid narrow, isolated paths which increase the connection resistance.
• Use a signal/ground/power circuit board stackup to maximize coupling between the ground and power
plane.
www.ti.com
ADC3683-SP
SBASAB5 – MARCH 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: ADC3683-SP



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