ADS7046 datasheet(19/44 Pages) TI1

Part #	ADS7046

Description	12-Bit, 3-MSPS, Single-Ended Input, Small-Size, Low-Power SAR ADC

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NFSC+1

PFSC

MC + 1

VREF ± 1 LSB

1 LSB

Single-Ended Analog Input

(AINP ± AINM)

MC

VIN

NFSC

2

VREF

1LSB

2

VREF

19

ADS7046

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SBAS785 – DECEMBER 2016

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8.3.4 ADC Transfer Function

The device supports a unipolar, single-ended analog input signal. The output is in straight binary format.

Figure 35 and Table 2 show the ideal transfer characteristics for the device.

The least significant bit for the device is given by:

1 LSB = VREF / 2

N

where:

•

VREF = Voltage applied between the AVDD and GND pins

•

N = 12

(1)

Figure 35. Ideal Transfer Characteristics

Table 2. Transfer Characteristics

INPUT VOLTAGE (AINP – AINM)

CODE

DESCRIPTION

IDEAL OUTPUT CODE

(Hex)

≤ 1 LSB

NFSC

Negative full-scale code

000

1 LSB to 2 LSB

NFSC + 1

—

001

VREF / 2 to VREF / 2 + 1 LSB

MC

Mid code

7FF

VREF / 2 + 1 LSB to VREF / 2 + 2 LSB

MC + 1

—

800

≥ VREF – 1 LSB

PFSC

Positive full-scale code

FFF

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