Analog Inputs; Changes To Table 2 - Analog Devices EVAL-ADAQ4001FMCZ User Manual

User Guide
EVALUATION BOARD HARDWARE

ANALOG INPUTS

The analog inputs of the EVAL-ADAQ4001PMDZ
ADAQ4003PMDZ, J1 and J2, are Subminiature Version B (SMB)
connectors. These inputs are fed to the ADA4898-1. J1 and J2 are
buffered with dedicated amplifier circuitry, U4 and U7, as shown in
Figure 26. The circuit enables different configurations, input range
scaling, filtering, amplifiers and supplies, and the addition of a
dc component. The analog input amplifiers are set as unity-gain
buffers at the factory.
Table 2. Jumper Details with Factory Default Setting
Link Default
JP1 Not populated
JP2 B1 and B2, A1 and A2
JP3 B1 and B2, A1 and A2
JP4 Pin A to Pin COM
JP5 Pin A to Pin COM
JP6 Pin A to Pin COM
JP6 Pin A to Pin COM
JP7 Pin B to Pin COM
JP8 Pin B to Pin COM
JP9 Pin B to Pin COM
JP10 Pin B to Pin COM
JP11 Pin A to Pin COM
JP12 Pin A to Pin COM
JP13 Pin A to Pin COM
JP14 Pin A to Pin COM
JP15 Pin A to Pin COM
analog.com
and EVAL-
Function
Gain options
µModule input
µModule input
Synchronize the switching frequency to CNV
Op amp or in-amp
Op amp or in-amp
Single-ended or differential input
Op amp or in-amp
Amplifier or in-amp
Gain setting pin (LSB)
Gain setting pin (MSB)
Power
Differential amplifier power mode
Differential amplifier power down
Reference buffer power down
Differential amplifier power down
The analog inputs are fully differential by default. If a single-ended
bipolar input is desired, such as ±10 V, the EVAL-ADAQ4001PMDZ
or EVAL-ADAQ4003PMDZ can be configured for single-ended to
differential conversion by changing JP6 to Pin B to Pin COM and by
applying the single-ended input at Connector J1 (see
For dynamic performance, a fast Fourier transform (FFT) test can
be performed by applying a low distortion ac source. For low fre-
quency testing, the audio precision source, such as the SYS-2700
series, can be used directly with the evaluation boards. Different
precision sources can be used with additional filtering.
Comment
Fully differential or single-ended configuration.
The ADAQ4001 or ADAQ4003
ADAQ4001 or the ADAQ4003 data sheet for other gains.
The ADAQ4001 or ADAQ4003 has a gain of 0.454 (22 V range). See the
ADAQ4001 or the ADAQ4003 data sheet for other gains.
To set the switching frequency to 1.2 MHz, pull the SYNC/FREQ pin of
the ADP5070 low or Pin B to Pin COM.
Connect the J1 input to the ADA4898-1 op amp.
Connect the J2 input to the ADA4898-1 op amp.
Differential input by default. Connect Pin B to COM for a single-ended
input and connect JP7 to Pin B to Pin COM.
Connect the ADA4898-1 op amp to the ADAQ4001 µModule or
ADAQ4003 µModule.
Connect Pin A to Pin COM to the output of the AD8251.
Refer to the AD8251 data sheet for the truth table logic levels for
transparent gain mode.
Refer to the AD8251 data sheet for the truth table logic levels for
transparent gain mode.
Differential amplifier positive supply. Tied to ground.
Differential amplifier positive supply. Tied to ground.
Normal mode. See the ADAQ4001 or the ADAQ4003 data sheet.
Powered up. See the ADAQ4001 or the ADAQ4003 data sheet.
Powered up. See the ADAQ4001 or the ADAQ4003 data sheet.
UG-1533
Table 2).
has a gain of 0.454 (22 V range). See the
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