Detailed Board Description - Analog Devices ADA2200-EVALZ User Manual

UG-702

DETAILED BOARD DESCRIPTION

The ADA2200-EVALZ consists of the
demodulator, powered by the
(LDO) regulator. Power is applied through the mini-B USB jack
by connecting the supplied cable to a powered USB port, or by
using the +5V and GND test points adjacent to the USB port.
An on-board oscillator circuit uses a ceramic resonator (ECS,
Inc. ZTB400P [Y1]) to clock the
oscillator circuit centers the band-pass filter at 1/64 of its clock
frequency, or 6.25 kHz. A different clock source and frequency
can be supplied through the CLKIN input, by placing the
jumper P13 between Position 1 and Position 2.
The input signal terminals are labeled IN+ and IN−. By default,
the ADA2200 is configured to be driven by a fully differential
source. The ADA2200 can be driven single-ended by applying
the signal between IN+ and ground, and connecting IN− to
VOCM through the P6 jumper (as shown in Table 1). Note that
the signal range for all the inputs and outputs is 0 V to 3.3 V;
exceeding this range on any input can damage the ADA2200.
There are two output signal terminals on the board. Probing
P11 or P12 with a scope displays the direct output signal from
the ADA2200. The P11 and P12 connectors are arranged to accept
a differential oscilloscope probe, but regular clips can also be
used. Connecting a voltmeter between P7 and P8 allows the
user to measure the dc signal after a 10 Hz, low-pass, RC filter.
The output terminals RCK and SYNCO can be used to
synchronize to the input and output signals, respectively. For
details on how to generate coherent signals or achieve
ADA2200 synchronous
ADP151 3.3 V low dropout
ADA2200 at 400 kHz. This
synchronization, refer to the Input Signal Synchronization
section and Output Signal Synchronization section. A summary
of the signals available on the board is shown on Table 2.
Note that the board includes pads for soldering side, launch,
SMA connectors (see Table 4 and the Johnson 142-0701-851
row). These connectors are commonly available for purchase
from electronic distributors.
Table 2. Terminal Description
Designator
P1
P2
P3
P4
P7
P8
P9
P10
P11
P12
+5V
GNDx
VOCM
TP6
TP7, TP8
TP9
TP10
TP12
Rev. 0 | Page 4 of 10
ADA2200-EVALZ User Guide
Signal Description
+5V Mini-B USB power connector
IN+ Noninverting input
IN− Inverting input
CLKIN External clock input
OUT+ Noninverted filtered output
OUT− Inverted filtered output
RCK Reference clock output
SYNCO Output synchronization pulse
OUTP Noninverted demodulated output
OUTN Inverted demodulated output
+5V Mini-B USB power connector
GND Multiple ground test points
VOCM Output common-mode voltage I/O
Boot from EEPROM signal (digital)
BOOT
ISUPPLY 10 Ω current shunt for 3.3 V supply
A0 EEPROM address selection
SCL EEPROM clock
SDA EEPROM data