AD9070/PCB Analog Devices Inc, AD9070/PCB Datasheet - Page 11

• Manufacturer Part Number: AD9070/PCB
• Description: BOARD EVAL FOR AD9070
• Manufacturer: Analog Devices Inc

Specifications of AD9070/PCB

• Rohs Status: RoHS non-compliant

5 V Operation
The AD9070 may be operated above ground, with a single 5 V
power supply. All power supply ground pins are connected to
5 V, and V
be taken in connecting signals and determining bypass rails.
The reference voltage (REF OUT) is still generated with respect
to the positive rail, which is now 5 V. It is nominally 2.5 V, but
its voltage with respect to ground will vary directly with changes
in the power supply voltage (for example, if the power supply
goes to 5.1 V, the reference becomes 2.6 V). The reference
input is likewise processed with respect to 5 V. This dictates
that these pins be bypassed to 5 V as well. However, the COMP
and REF BYPASS pins must continue to be bypassed to the
most negative supply, which is now ground. The AIN input
must still be connected or bypassed to the ground reference of
the input signal.
1Vp-p
ENCODE
ENCODE
V
IN
0.1 F
0.1 F
R
EE
T
pins are connected to ground (Figure 12). Care must
500
10 H
0.1 F
5V
0.1 F
AIN
AIN
VREF IN
ENCODE
ENCODE
VREF OUT
COMP
AD9070
GND
V
5V
EE
(MSB) D9
(LSB) D0
BYPASS
REF
0.1 F
510
(OR 100
510
(OR 100
D9
D0
TO +3V)
TO +3V)
Package Options
The AD9070 is available in two packages. The BR package is a
standard 28-lead Small Outline IC (SOIC). The DIP package is
a ceramic Dual-in-Line Hybrid. The SOIC is offered in a commer-
cial grade, and specified over the industrial (–40°C to +85°C)
temperature range. The DIP is a full MIL-PRF-38534 QML
version that operates from (–55°C to +125°C).
The SOIC version includes the on-chip voltage reference, whereas
the DIP does not. The DIP, however, provides the Overrange
(OR) output, and includes reference and power supply bypass-
ing, along with an internal compensation capacitor.
Equivalent performance may be obtained with either part though,
due to the internal bypassing, the DIP is not as sensitive to
board layout and parasitics.
AD9070