ADC1613D_11 datasheet(14/43 Pages) NXP

Part #	ADC1613D

Description	Dual 16-bit ADC; 65 Msps, 80 Msps, 105 Msps or 125 Msps; serial JESD204A interface

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Manufacturer	NXP [NXP Semiconductors]

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ADC1613D_SER

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

Product data sheet

Rev. 3 — 9 February 2011

14 of 43

NXP Semiconductors

ADC1613D series

Dual 16-bit ADC: serial JESD204A interface

11. Application information

11.1 Analog inputs

11.1.1 Input stage description

The analog input of the ADC1613D supports a differential or a single-ended input drive.

Optimal performance is achieved using differential inputs with the common-mode input

voltage (VI(cm)) on pins INP and INM set to 0.5VDDA.

The full-scale analog input voltage range is configurable between 1 V (p-p) and 2 V (p-p)

via a programmable internal reference (see Section 11.2 and Table 21).

Figure 6 shows the equivalent circuit of the sample-and-hold input stage, including

ElectroStatic Discharge (ESD) protection and circuit and package parasitics.

The sample phase occurs when the internal clock (derived from the clock signal on pin

CLKP/CLKM) is HIGH. The voltage is then held on the sampling capacitors. When the

clock signal goes LOW, the stage enters the hold phase and the voltage information is

transmitted to the ADC core.

11.1.2 Anti-kickback circuitry

Anti-kickback circuitry (Figure 7) is needed to counteract the effects of a charge injection

generated by the sampling capacitance.

The RC filter is also used to filter noise from the signal before it reaches the sampling

stage. The value of the capacitor should be chosen to maximize noise attenuation without

degrading the settling time excessively.

Fig 6.

Input sampling circuit

005aaa069

INAP

INBP

package

ESD

parasitics

switch

Ron = 15 Ω

4 pF

Cs

switch

Ron = 15 Ω

INAM

INBM

1, 14

2, 13

internal

clock

internal

clock

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ADC1613D Datasheet(PDF) 14 Page - NXP Semiconductors

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