ADC1412D Datasheet, PDF(19/40 Page) NXP Semiconductors – Dual 14-bit ADC; 65 Msps, 80 Msps, 105 Msps or 125 Msps; CMOS or LVDS DDR digital outputs

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ADC1412D Datasheet, PDF (19/40 Pages) NXP Semiconductors – Dual 14-bit ADC; 65 Msps, 80 Msps, 105 Msps or 125 Msps; CMOS or LVDS DDR digital outputs

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NXP Semiconductors

ADC1412D series

CMOS or LVDS DDR digital outputs

VREF

REFERENCE

AMP

BUFFER

EXT_ref

BANDGAP

REFERENCE

REFAT/

REFBT

REFAB/

REFBB

SENSE

SELECTION

LOGIC

ADC CORE

Fig 12. Reference equivalent schematic

005aaa164

If bit INTREF_EN is set to 0, the reference voltage is determined either internally or

externally as detailed in Table 12.

Table 12. Reference selection

Selection

SPI bit

INTREF_EN

internal

(Figure 13)

internal

(Figure 14)

external

(Figure 15)

internal via SPI 1

(Figure 16)

SENSE pin VREF pin

Full-scale (p-p)

AGND

330 pF capacitor to

AGND

pin VREF connected to pin SENSE and

via a 330 pF capacitor to AGND

VDDA

external voltage between

0.5 V and 1 V[1]

pin VREF connected to pin SENSE and

via 330 pF capacitor to AGND

1 V to 2 V

[1] The voltage on pin VREF is doubled internally to generate the internal reference voltage.

ADC1412D_SER

Preliminary data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 03 â 6 August 2010

19 of 40

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