参数资料
型号: ADC081S101
厂商: National Semiconductor Corporation
元件分类: 串行ADC
英文描述: 1MSPS, 12-/10-/8-Bit A/D Converters in SOT-23
中文描述: 1MSPS,12/10/8位的A / D转换器采用SOT - 23
文件页数: 10/13页
文件大小: 621K
代理商: ADC081S101
Applications Information
(Continued)
3.0 ADC081S051 TRANSFER FUNCTION
The output format of the ADC081S051 is straight binary. Code transitions occur midway between successive integer LSB values.
The LSB width for theADC081S051 is V
A
/256. The ideal transfer characteristic is shown in Figure 5. The transition from an output
code of 0000 0000 to a code of 0000 0001 is at 1/2 LSB, or a voltage of V
A
/512. Other code transitions occur at steps of one LSB.
4.0 TYPICAL APPLICATION CIRCUIT
A typical application of the ADC081S051 is shown in Figure
6. Power is provided in this example by the National Semi-
conductor LP2950 low-dropout voltage regulator, available in
a variety of fixed and adjustable output voltages. The power
supply pin is bypassed with a capacitor network located
close to the ADC081S051. Because the reference for the
ADC081S051 is the supply voltage, any noise on the supply
will degrade device noise performance. To keep noise off the
supply, use a dedicated linear regulator for this device, or
provide sufficient decoupling from other circuitry to keep
noise off the ADC081S051 supply pin. Because of the
ADC081S051’s low power requirements, it is also possible to
use a precision reference as a power supply to maximize
performance. The four-wire interface is also shown con-
nected to a microprocessor or DSP.
20145511
FIGURE 5. Ideal Transfer Characteristic
20145513
FIGURE 6. Typical Application Circuit
A
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