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ADC3908CSSS 数据表(PDF) 25 Page - Texas Instruments

部件名 ADC3908CSSS
功能描述  ADC3908Dx and ADC3908Sx 8-bit, 25 to 125MSPS Low Latency, Low Power, Small, Single and Dual Channel ADC with Integrated Input Buffers
PDF  47 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

ADC3908CSSS 数据表(HTML) 25 Page - Texas Instruments

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7.3 Feature Description
7.3.1 Analog Input
The analog inputs of ADC3908Dx and ADC3908Sx supports differential and single-ended configuration, with
support for AC coupling and DC coupling. Analog inputs are designed for an input common mode voltage of
1.25V which must be provided externally on each input pin. DC-coupled input signals must have a common
mode voltage that meets the device input common mode voltage range.
The ADC3908Dx and ADC3908Sx has buffered analog inputs which eases design by isolating the input from the
ADC sampling operation.
7.3.1.1 Single Ended Input
The ADC3908Dx and ADC3908Sx can be configured to operate in single ended mode using just the positive
signal input. This operating mode must be enabled via pin control (Interface configuration table). The single
ended signal is connected to the positive input of the ADC and negative input must be biased to VCM as shown
in Figure 7-3.
V
CM
INxP
INxM
0.475V
-0.475V
0V
0.475V
-0.475V
V
CM
R
V
CM
INxP
INxM
V
CM
Figure 7-3. Single ended analog input: AC coupled (left) and DC coupled (right)
7.3.1.2 Differential Input
The ADC3908Dx and ADC3908Sx supports differential mode with a swing of 1.9VPP as shown in Figure 7-4.
This operating mode must be enabled via pin control (Interface configuration table).
+
–
V
CM
+
–
INxP
INxM
V
CM
INxP
INxM
V
CM
R
R
Figure 7-4. Differential analog input: AC coupled (left) and DC coupled (right)
7.3.1.3 Analog Input Bandwidth
Figure 7-5 shows the analog full power input bandwidth. The -3dB bandwidth is approximately 150MHz.
www.ti.com
ADC3908D025, ADC3908D065, ADC3908D125
ADC3908S025, ADC3908S065, ADC3908S125
SBASAU9 – OCTOBER 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: ADC3908D025 ADC3908D065 ADC3908D125 ADC3908S025 ADC3908S065 ADC3908S125



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