IN1

IN2

MICROPROCESSOR

DSP

SCLK

CS

DIN

DOUT

GND

ADC104S101

LP2950

5V

1 PF

TANT

0.1 PF

0.1 PF

1 PF

IN3

IN4

|

0V

0.5LSB

ANALOG INPUT

111...111

111...110

111...000

011...111

000...010

000...001

000...000

ADC104S101

www.ti.com

SNAS284F – FEBRUARY 2005 – REVISED MARCH 2013

ADC104S101 TRANSFER FUNCTION

The output format of the ADC104S101 is straight binary. Code transitions occur midway between successive

Figure 50. The transition from an output code of 00 0000 0000 to a code of 00 0000 0001 is at 1/2 LSB, or a

Figure 50. Ideal Transfer Characteristic

TYPICAL APPLICATION CIRCUIT

A typical application of the ADC104S101 is shown in Figure 51. Power is provided in this example by the Texas

Instruments 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 ADC104S101.

Because the reference for the ADC104S101 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 ADC104S101 supply pin. Because of the

ADC104S101'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 connected to a microprocessor or DSP.

Figure 51. Typical Application Circuit

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