Analog Devices EVAL-AD7386FMCZ, User Manual

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UG-1615 EVAL-AD7386FMCZ User Guide
Rev. A | Page 4 of 21
EVALUATION BOARD HARDWARE
AD7386 DESCRIPTION
The AD7386 is a 16-bit dual, simultaneous sampling, high
speed, low power, successive approximation ADC and features a
throughput rate of 4 MSPS. The analog input type is differential.
The
AD7386 can accept a wide common-mode input voltage
and is sampled and converted on the falling edge of CS.
The
AD7386 has an optional integrated, on-chip, oversampling
block to improve dynamic range and reduce noise at lower
bandwidths. An internal 2.5 V reference is included.
Alternatively, an external reference up to 3.3 V can be used.
The conversion process and data acquisition use standard control
inputs, allowing easy interfacing to microprocessors or digital
signal processors (DSPs). The
AD7386 is compatible with 1.8 V,
2.5 V, and 3.3 V interfaces, using the separate logic supply.
The
AD7386 is available in a 16-lead LFCSP with operation
specified from −40°C to +125°C.
POWER SUPPLIES
The EVAL-AD7386FMCZ operates from a 12 V power supply.
Ensure that all link positions are set according to the required
operating mode before applying power and signals to the
EVAL-AD7386FMCZ. See Table 2 for the complete list of link
options.
The EVAL-AD7386FMCZ is powered by the
EVAL-SDP-CH1Z
board by default. External power supplies can be applied to the
board. See Table 1 for a description of the connectors used and
Table 2 for the link configurations required.
Table 1. Optional External Power Supplies
Power Supply Connector Voltage Range (V) Description
12V P4-1 12 ± 10% Main board power supply for all internal voltage regulators
GND P4-2 0 Ground
VCC P5-1 3.3 ± 5% ADC analog power supply
GND P5-2 0 Ground
VLOGIC P5-3 2.3 ± 5% Digital serial peripheral input (SPI) power supply
AMP− P6-1 5 ± 5% Amplifier positive power supply
GND P6-2 0 Ground
AMP+ P6-3 −2.5 ± 5% Amplifier negative power supply
AD7386
A
IN
x0
V
LOGIC
V
CC
REFIO
GND
A
IN
x1
VCC
VLOGIC
GND
12V DC
INPUT
GND
AMP+
AMP–
GND
ON-BOARD
POWER SUPPLIES
ADP7104
+5V
AMP+
ADP7182
–2.5V
AMP+
ADP166
+2.3V
VLOGIC
ADP166
+3.3V
VCC
ADA4896-2
ADA4896-2
INPUT
SIGNALS
ADR4533
+3.3V
ADR4525
+2.5V
POWER
GOOD
SPI SPI
SERIAL
INTERFACE
TO PC
USB
DIGITAL
SIGNAL
PROCESSOR
EVAL-SDP-CH1Z
CONTROLLER
BOARD
12V
CS
SCLK
SDI
SDOA
SDOB/ALERT
21193-
003
Figure 3. EVAL-AD7386FMCZ Functional Block Diagram