Analog Devices ADA2200-EVALZ, Руководство пользователя

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UG-702 ADA2200-EVALZ User Guide
DETAILED BOARD DESCRIPTION
The ADA2200-EVALZ consists of the ADA2200 synchronous
demodulator, powered by the ADP151 3.3 V low dropout
(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
ADA2200 at 400 kHz. This
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
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 Signal Description
P1 +5V Mini-B USB power connector
P2 IN+ Noninverting input
P3 IN− Inverting input
P4 CLKIN External clock input
P7 OUT+ Noninverted filtered output
P8 OUT− Inverted filtered output
P9 RCK Reference clock output
P10 SYNCO Output synchronization pulse
P11 OUTP Noninverted demodulated output
P12 OUTN Inverted demodulated output
+5V +5V Mini-B USB power connector
GNDx GND Multiple ground test points
VOCM VOCM Output common-mode voltage I/O
TP6
BOOT
Boot from EEPROM signal (digital)
TP7, TP8 ISUPPLY 10 Ω current shunt for 3.3 V supply
TP9 A0 EEPROM address selection
TP10 SCL EEPROM clock
TP12 SDA EEPROM data
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