AM4376 datasheet(114/261 Pages) TI

114 / 261 page

AM4376, AM4377, AM4378, AM4379

SPRS851B – JUNE 2014 – REVISED APRIL 2015

www.ti.com

5.9

ADC1: Analog-to-Digital Subsystem Electrical Parameters

The analog-to-digital converter (ADC) subsystem implements a basic general-purpose ADC1.

Table 5-6 summarizes the ADC1 subsystem electrical parameters.

Table 5-6. ADC1 Electrical Parameters

PARAMETER

CONDITION

MIN

NOM

MAX

UNIT

ANALOG INPUT

(0.5 * VDDA_ADC1) +

Bypass mode

VDDA_ADC1

0.25

ADC1_VREFP(1)

(0.5 * VDDA_ADC1) +

Gain mode

1.2(2)

VDDA_ADC1

0.25

(0.5 * VDDA_ADC1) -

Bypass mode

0.25

ADC1_VREFN(1)

(0.5 * VDDA_ADC1) -

Gain mode

0.5(2)

0.25

ADC1_VREFP + ADC1_VREFN

VDDA_ADC1

Bypass mode, Internal Voltage

VDDA_ADC1

Reference

Bypass mode, External Voltage

ADC1_VREFN

ADC1_VREFP

Reference

Full-scale Input Range

Gain mode, Internal Voltage

-(VDDA_ADC1 / Gain)

(VDDA_ADC1 / Gain)

Reference

Gain mode, External Voltage

-((ADC1_VREFP -

((ADC1_VREFP -

Reference

ADC1_VREFN) / Gain)

Preamp output

Gain mode (differential)

2.4

Internal Voltage Reference:

VDDA_ADC1 = 1.8 V

Differential Nonlinearity

External Voltage Reference:

-1

0.5

LSB

(DNL)

ADC1_VREFP - ADC1_VREFN =

1.8 V

GAIN_CTRLx[MSB:LSB] = 00b

GAIN_CTRLx[MSB:LSB] = 01b

Preamp Gain

GAIN_CTRLx[MSB:LSB] = 10b

GAIN_CTRLx[MSB:LSB] = 11b

Preamp Bandwidth

Gain mode

kHz

Bypass mode

Source impedance =

≤ 1k Ω

Internal Voltage Reference:

VDDA_ADC1 = 1.8 V

-2

±1

External Voltage Reference:

ADC1_VREFP - ADC1_VREFN =

1.8 V

Integral Nonlinearity (INL)

LSB

Gain mode

Internal Voltage Reference:

VDDA_ADC1 = 1.8 V

±1

External Voltage Reference:

ADC1_VREFP - ADC1_VREFN =

1.8 V

Internal Voltage Reference:

VDDA_ADC1 = 1.8 V

Gain Error

External Voltage Reference:

±2

LSB

ADC1_VREFP - ADC1_VREFN =

1.8 V

Internal Voltage Reference:

VDDA_ADC1 = 1.8 V

Offset Error

External Voltage Reference:

±2

LSB

ADC1_VREFP - ADC1_VREFN =

1.8 V

114

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