AD4002 datasheet(22/39 Pages) AD

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AD4002/AD4006/AD4010

Data Sheet

Rev. A | Page 22 of 39

Table 10. RC Filter and Amplifier Selection for Various Input Bandwidths

Input Signal Bandwidth (kHz)

ADC

R (Ω)

C (F)

Recommended Amplifier

Precision ADC Driver Tool

<10

AD4002 (2 MSPS)

200

180 p

ADA4807-1

ADC Driver Tool Example

AD4006 (1 MSPS)

680

180 p

ADA4807-1

ADC Driver Tool Example

AD4010 (500 kSPS)

680

180 p

ADA4807-1

ADC Driver Tool Example

AD4002 (2 MSPS)

390

180 p

ADA4077-1

ADC Driver Tool Example

AD4006 (1 MSPS)

680

180 p

ADA4077-1

ADC Driver Tool Example

AD4010 (500 kSPS)

680

470 p

ADA4077-1

ADC Driver Tool Example

AD4002 (2 MSPS)

390

180 p

ADA4610-1

ADC Driver Tool Example

AD4006 (1 MSPS)

680

180 p

ADA4610-1

ADC Driver Tool Example

AD4010 (500 kSPS)

680

470 p

ADA4610-1

ADC Driver Tool Example

<100

AD4002 (2 MSPS)

200

180 p

ADA4807-1

ADC Driver Tool Example

AD4006 (1 MSPS)

200

360 p

ADA4807-1

ADC Driver Tool Example

AD4010 (500 kSPS)

200

360 p

ADA4807-1

ADC Driver Tool Example

≥100

AD4002 (2 MSPS)

120

180 p

ADA4897-1

ADC Driver Tool Example

AD4006 (1 MSPS)

200

180 p

ADA4897-1

ADC Driver Tool Example

AD4010 (500 kSPS)

120

180 p

ADA4897-1

ADC Driver Tool Example

Multiplexed

AD4002 (2 MSPS)

100

180 p

ADA4897-1

ADC Driver Tool Example

AD4006 (1 MSPS)

200

180 p

ADA4897-1

ADC Driver Tool Example

AD4010 (500 kSPS)

200

180 p

ADA4897-1

ADC Driver Tool Example

DRIVER AMPLIFIER CHOICE

Although the AD4002/AD4006/AD4010 are easy to drive, the

driver amplifier must meet the following requirements:



The noise generated by the driver amplifier must be kept

low enough to preserve the SNR and transition noise

performance of the AD4002/AD4006/AD4010. The noise

from the driver is filtered by the single-pole, low-pass filter

of the analog input circuit made by RIN and CIN, or by the

external filter, if one is used. Because the typical noise of the

AD4002/AD4006/AD4010 is 30.4 μV rms, the SNR

degradation due to the amplifier is the following:



 





















μV

30.4

μV

30.4

log

LOSS

SNR

where:

f−3 dB is the input bandwidth, in megahertz, of the AD4002/

AD4006/AD4010 (10 MHz) or the cutoff frequency of the

input filter, if one is used.

N is the noise gain of the amplifier (for example, 1 in buffer

configuration).

eN is the equivalent input noise voltage of the operational

amplifier, in nV/√Hz.



For ac applications, the driver must have a THD performance

commensurate with the AD4002/AD4006/AD4010.



For multichannel multiplexed applications, the driver

amplifier and the analog input circuit of the AD4002/

AD4006/AD4010 must settle for a full-scale step onto the

capacitor array at an 18-bit level (0.000384%, 3.84 ppm).

In amplifier data sheets, settling at 0.1% to 0.01% is more

commonly specified. Settling at 0.1% to 0.01% may differ

significantly from the settling time at an 18-bit level and

must be verified prior to driver selection.

The Precision ADC Driver Tool can be used to model the

settling behavior and to estimate the ac performance of the

AD4002/AD4006/AD4010 with a selected driver amplifier and

RC filter. Once the Precision ADC Driver Tool has modelled a

specific circuit, the circuit can be exported for simulation in

LTspice.

High Frequency Input Signals

The AD4002/AD4006/AD4010 ac performance over a wide

input frequency range using a 5 V reference voltage is shown

in Figure 17 and Figure 20. Unlike other traditional SAR ADCs, the

AD4002/AD4006/AD4010 maintain exceptional ac performance

for input frequencies up to the Nyquist frequency with minimal

performance degradation. Note that the input frequency is limited

to the Nyquist frequency of the sample rate in use.

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