UG-1042 Datasheet, PDF (4/24 Pages) Analog Devices – Fully featured evaluation board for 10-lead precision

UG-1042
Easy to Use AD4000 Series16-/18-Bit Precision SAR ADCs User Guide
The SDP-H1 has a FMC low pin count (LPC) connector with
full differential LVDS and singled ended LVCMOS support. It
also has the 120-pin connector, found on the SDP-B, which
exposes the Blackfin processors peripherals. This connector
provides a configurable serial, parallel I²C and SPI, and GPIO
communications lines to the attached daughter board.
SOLDER LINKS
The three-solder link options on the board are configured
depending on which generic of the ADC is on the specific
evaluation board as described in Table 3.
Table 2. Table of Jumper Detail with Factory Default Setting
Link Default Function Comment
SL1 A
+VS
Change to B if using bench
supplies
SL2 A
−VS
Change to B if using bench
supplies
SL5 A
+VS
Change to B if using bench
supplies
SL6 A
−VS
Change to B if using bench
supplies
SL7 A
VDD for
ADC
Change to B if using bench
supplies
SL8 A
−VS
Change to B if using bench
supplies
SL9 A
+VS
Change to B if using bench
supplies
LK2 A
VREF
Change to B if using the ADR3450
LK5 B
SDI
Change to A if using V_DRIVE
JP1 B
FSEL (U3) Change to A if using Ground
JP2 B
ADC
drivers
Change to A if using FDA
ADA4940-1
JP3 B
ADC
drivers
Change to A if using FDA
ADA4940-1
JP4 B
ADC
drivers
Change to A if using FDA
ADA4940-1
JP5 B
ADC
drivers
Change to A if using FDA
ADA4940-1
JP7 B
V_DRIVE
Change to A if using external
3.3 V for V_DRIVE
JP8 B
STOP (U20) Change to A if using CNV_FMC
from SDP-H1 connector
Table 3. Table of Jumpers Specific to 10-Lead Precision ADCs
Link Default Configuration
Generic
SL4 A
Differential input
AD4001, AD4003
SL4 B
Single-ended or
pseudo differential
AD4000
ANALOG INPUTS
The analog inputs to the evaluation board are SMA connectors,
J6 and J10. These inputs are buffered with dedicated amplifier
circuitry (U12 and U14), as shown in Figure 25. The circuit allows
different configurations, input range scaling, filtering, addition of a
dc component, and use of different op amp and supplies. The
analog input amplifiers are set as unity-gain buffers at the factory.
The default configuration sets both U12 and U14 at midscale,
generated from a buffered reference voltage divider (VCM).
The evaluation board is factory configured for providing either
a single-ended path or a fully differential path.
For dynamic performance, a fast Fourier transform (FFT) test
can be performed by applying a very low distortion ac source.
For low frequency testing, the audio precision source (such as the
SYS-2700 series) can be used directly because the outputs on these
are isolated. Set the outputs for balanced and floating ground.
Different precision sources can be used with additional filtering.
Because the evaluation board uses the amplifiers in unity-gain,
the noninverting input has a common-mode input with a 590 Ω
resistor divider, and it must be taken into account when directly
connecting a source.
Rev. B | Page 4 of 24