UG-581 Datasheet, PDF (5/28 Pages) Analog Devices – Full-featured evaluation board

Evaluation Board User Guide
EVAL-AD7961FMCZ
Table 3. On-Board Power Supplies Description
Power Supply Voltage Range (V) Purpose
+VS
+5 V to +7 V
ADP7104 (U10) and ADP7102 (U18) generate the necessary +5 V and +7 V, respectively, from
+12 V coming from EVAL-SDP-CH1Z. The +7 V supply is recommended for on-board amplifier +VS.
The +5 V supply is provided to VDD1 (U1), ADP2300 (U2), ADR4540/ADR4550 (U5 and U8), and
ADP124 (U3 and U12). The user also has an option to use an external bench top supply +VS
through J3.
−VS
|+VS to −VS|
VDD1
−2 V to −5 V
12 V¹
5 V²
ADP2300 generates −2.5 V for amplifier −VS. The user also has an option to use an external bench
top supply −VS through J3.
Maximum range of supply for correct operation.
AD7961 Analog Supply Rail.
VDD2, VIO
1.8 V²
ADC Supply Rails.
1_{Dictated by ADA4899-1 supply operation.}
2_{Refer to the AD7961 data sheet}
SERIAL INTERFACE
The EVAL-AD7961FMCZ uses the serial interface connection
to the EVAL-SDP-CH1Z. The EVAL-AD7961FMCZ operates
only in echo-clocked serial interface mode. This mode requires
three LVDS pairs (D±, CLK±, and DCO±) between each
AD7961 and the digital host. The EVAL-SDP-CH1Z board
features include
• XILINX Spartan®-6 FPGA
• DDR2
• Micron MT47H32M16Hr-25E:G
−8 Mb × 16 bits × 4 Banks(512 Mb/64 Mb)
• SRAM
• ISSI IS61WV25616BLL-10BLI
–256 Kb × 16 bits (4 Mb/512 Kb)
• 1× 160-pin FMC-LPC connector (refer to the VITA 57
specification)
• Samtec ASP-134603-01
• Up to 1080 Mbps LVDS
• Single-ended LVCMOS
• Power
• Analog Devices, Inc., ADSP-BF527 Blackfin® processor
• Core performance up to 600 MHz
• 208-ball CSP-BGA package
• 24 MHz CLKIN oscillator
• 32 Mb flash memory
• Numonyx M29W320EB or
• Numonyx M25P32
• SDRAM memory
• Micron MT48LC16M16A2P-6A
−16 Mb × 16 bits (256 Mb/32 MB)
• 2 × 120-pin small foot print connectors
• Hirose FX8-120P-SV1(91),120-pin header
• Blackfin processor peripherals exposed
• SPI
• SPORT
• TWI/I²C
• GPIO
• PPI
• Asynchronous parallel
ANALOG INPUTS
This section provides information on the analog input options
and how these options can be configured as well as information
on how customers should connect their signal source.
The analog inputs applied to the EVAL-AD7961FMCZ board
are J1 and J2 SMA (push-on) connectors. These inputs are
buffered with dedicated discrete driver amplifier circuitry
(U15 and U16 or U14) as shown in Figure 1.
The circuit allows for different configurations, input range
scaling, filtering, the addition of a dc component, use of a
different op amp, and a differential amplifier and supplies.
The analog input amplifiers are set as unity gain buffers at the
factory. The driver amplifiers (U14, U15, and U16) positive rails
are driven from +7 V (from ADP7102, U18) and negative rail
from −2.5 V; the other reference buffers (U4 and U11) positive
rails are driven from +7 V and negative rails are grounded;
these could be changed to a different value as required.
The range of supplies possible is listed in Table 3. The default
configuration sets both U15 and U16 at mid-scale generated
from a buffered reference voltage (VCM) of the AD7961 (U1).
The evaluation board is factory configured for providing either
a single-ended path or a fully differential path as described in
Table 1.
For dynamic performance, an FFT test can be performed by
applying a very low distortion source.
For low frequency testing, the audio precision source can be
used directly because the outputs on these are isolated. Set the
outputs for balanced and floating. Different sources can be used
though most are single ended and use a fixed output resistance.
Since the evaluation board uses the amplifiers in unity gain,
the noninverting input has a common-mode input with a series
49.9 Ω resistor and it needs to be taken into account when
directly connecting a source (voltage divider).
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