EVAL-ADAQ23875FMCZ
User Guide
UG-1896
Rev. 0 | Page 3 of 26
EVALUATION BOARD HARDWARE
–VS
+VS
ADA4899-1
(OPTIONAL)
ADG774
(OPTIONAL)
ADA4899-1
(OPTIONAL)
IN–
IN+
+VS
–VS
+5
12V
WALL WART
USB PORT
EVAL-ADAQ23875FMCZ
VIN–
VIN+
POWER SUPPLY CIRCUITRY
(OPTIONAL)
LTM8049
ADP7183
ADP7118
+VS/PDB_AMP/MODE
(+6.5V)
+3.3V
+V
S
GND
–V
S
–VS
(–2V)
+VIO
(+2.5V)
+VDD
(+5V)
LTM3023
–2.5V
+7V
0.1µF
0.1µF
0.1µF
2
5Ω
15k
Ω
2
5Ω
10µF
82pF
82pF
GND
PDB_ADC
ADCIN+ ADCIN–
VDD
REFBUF
REFIN
2
2.048V
REFERENCE
0.5
VCMO
VS+
0.1µF
+12V
+3.3V
VIO
CNV+, CNV–
DA+/DA–, DB+/DB–
DCO+, DCO–
CLK+, CLK–
SERIAL LVDS
INTERFACE
16-BIT, 15MSPS ADC
POWER
SUPPLY
CIRCUITRY
160-PIN FMC
CONNECTOR
ADSP-BF527
EVAL-SDP-CH1Z
SPARTAN-6
FPGA
XC6SLX25
LVDS INTERFACE
550
Ω
550
Ω
0.1µF
0.1µF
1.3pF
1.3pF
VS–
MODE
PDB_AMP
1.1k
Ω
VCMO
1.1k
Ω
FDA
25385-
002
Figure 2. Simplified Evaluation Block Diagram
SETTING UP THE EVALUATION BOARD
Figure 2 shows the simplified evaluation board block diagram
of the EVAL-ADAQ23875FMCZ connected to the
SDP-H1
controller board. The board consists of one µModule (U1,
ADAQ23875
), a choice of a 4.096 V reference (U5,
LTC6655
)
or 2.048V reference (U3,
ADR4520
), on-board power supplies
to derive the necessary supply rails using the
LTM8049
(U6),
the
ADP7118
(U4), the
ADP7183
(U7), the
LT3023
(U8), and a
800 MHz clock distribution IC (U13). The user also has an
option to use the A2 and A3 amplifiers, such as the
ADA4899-1
and the
ADG774
(U2), when evaluating the
ADAQ23875
.
SDP-H1
CONTROLLER BOARD
The EVAL-ADAQ23875FMCZ evaluation board uses an SPI
interface and is connected to the high speed controller board
for the system demonstration platform (
SDP-H1
) controller board.
The
SDP-H1
board requires power from a 12 V wall adapter. The
SDP-H1
has a Xilinx® Spartan 6 and an
ADSP-BF527
processor
with connectivity to the PC through a USB 2.0 high speed port.
The controller boards allow the configuration and capture of
data on the daughter boards from the PC via a USB.
The
SDP-H1
has an FMC low pin count (LPC) connector with
full differential LVDS and singled-ended LVCMOS support. It
also features the 160-pin connector, found on the
SDP-B
, which
exposes the Blackfin® processor peripherals. This connector
provides a configurable serial, parallel I
2
C and SPI, and general-
purpose input/output (GPIO) communications lines to the
attached daughter boar for the functional description of the
on-board power supplies.
POWER SUPPLIES
By default, all necessary supply rails on the EVAL-
ADAQ23875FMCZ are powered by a 3.3 V rail coming from the
SDP-H1
board. The EVAL-ADAQ23875FMCZ can be powered
from an external 3.3 V supply applied using the JP9 solder link if
desired (see Table 2). The EVAL-ADAQ23875FMCZ positive
rails, 7 V (+VS), 5 V (VDD), and 2.5 V (VIO), are generated
from a combination of the power µModule, U6 (
LTM8049
), U4
(
ADP7118-2.5
), and a dual output LDO, U8 (
LT3023
). The EVAL-
ADAQ23875FMCZ negative rail, −2.0 V (−VS), is generated by a
combination of the power µModule, U6 (
LTM8049
), and U7
(
ADP7183
). Each supply rail includes necessary decoupling
capacitors placed closed to the device. A single ground plane is
used on this board to minimize the effect of high frequency
noise interference.
Table 1. On-Board Power Supplies
Power Supply (V)
Function
+7.5, −2.5
Supply rails using the
LTM8049
+7 (default)
VS+ rail using the
LT3023
−2 (default)
1
VS− rail using the
ADP7183
+2.5
VIO rail using the
ADP7118
+5
VDD rail using the
LT3023
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