AD9070 查看數據表（PDF） - Analog Devices
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AD9070 Datasheet PDF : 16 Pages
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AD9070
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 VEE pins are connected to ground (Figure 12). Care must
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.
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.
5V
VIN
1Vp-p
0.1F
RT
500⍀
0.1F
10H
0.1F
GND
AIN
AD9070
AIN
(MSB) D9
VREF OUT
VREF IN
D9
510⍀
(OR 100⍀ TO +3V)
ENCODE
ENCODE
5V
(LSB) D0
ENCODE
ENCODE
REF
COMP VEE BYPASS
D0
510⍀
(OR 100⍀ TO +3V)
0.1F
0.1F
Figure 12. AD9070 in 5 V (PECL) Environment
REV. C
–11–
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