Analog Devices EVAL-ADAQ4003FMCZ, Руководство пользователя

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UG-1533 EVAL-ADAQ4003FMCZ Evaluation Board User Guide
Rev. 0 | Page 6 of 31
ANALOG INPUTS
The analog inputs of the EV-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 34. 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.
The analog inputs are fully differential by default. If a single-ended
bipolar input is desired, such as ±10 V, the EV-ADAQ4003PMDZ
can be configured for single-ended to differential conversion
by changing JP6 to Position 2 and Position 3 and by applying the
single-ended input at Connector J1 (see Table 2).
For dynamic performance, a fast Fourier transform (FFT) test
can be performed by applying a low distortion ac source. For
low frequency testing, the audio precision source, such as the
SYS-2700 series, can be used directly with the evaluation board.
Different precision sources can be used with additional filtering.
Table 2. Jumper Details with Factory Default Setting
Link Default Function Comment
JP1 Not populated Gain options Fully differential or single-ended configuration.
JP2 B1 and B2, A1 and A2 µModule input
The ADAQ4003 has a gain of 0.454 (20 V range). See the
ADAQ4003 data sheet for other gains.
JP3 B1 and B2, A1 and A2 µModule input The ADAQ4003 has a gain of 0.454 (20 V range). See the
ADAQ4003 data sheet for other gains.
JP4 Pin A to Pin COM Synchronize the switching frequency to CNV To set the switching frequency to 1.2 MHz, pull the
SYNC/FREQ pin of the
ADP5070 low or Pin B to Pin COM.
JP5 Pin A to Pin COM Op amp or in-amp Connect the J1 input to the ADA4898-1 op amp.
JP6 Pin A to Pin COM Op amp or in-amp Connect the J2 input to the ADA4898-1 op amp.
JP6 Pin A to Pin COM Single-ended or differential input Differential input by default. Connect Pin B to COM for a
single-ended input and connect JP7 to Pin B to Pin COM.
JP7 Pin B to Pin COM Op amp or in-amp Connect the ADA4898-1 op amp to the ADAQ4003
µModule.
JP8 Pin B to Pin COM Amplifier or in-amp Connect Pin A to Pin COM to the output of the AD8251 .
JP9 Pin B to Pin COM Gain setting pin (LSB)
Refer to the AD8251 data sheet for the truth table logic
levels for transparent gain mode.
JP10 Pin B to Pin COM Gain setting pin (MSB) Refer to the AD8251 data sheet for the truth table logic
levels for transparent gain mode.
JP11 Pin A to Pin COM Power Differential amplifier positive supply. Tied to ground.
JP12 Pin A to Pin COM Differential amplifier power mode Differential amplifier positive supply. Tied to ground.
JP13 Pin A to Pin COM Differential amplifier power down Full power mode. See the ADAQ4003 data sheet.
JP14 Pin A to Pin COM Reference buffer power down Powered up. See the ADAQ4003 data sheet.
JP15 Pin A to Pin COM Differential amplifier power down Powered up. See the ADAQ4003 data sheet.