AD9260-EB Analog Devices, Inc., AD9260-EB Datasheet - Page 29
AD9260-EB
Manufacturer Part Number
AD9260-EB
Description
High-speed Oversampling Cmos Adc With 16-bit Resolution At A 2.5 Mhz Output Word Rate
Manufacturer
Analog Devices, Inc.
Datasheet
1.AD9260-EB.pdf
(44 pages)
- Current page: 29 of 44
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The actual reference voltages used by the internal circuitry of
the AD9260 appear on the CAPT and CAPB pins. If VREF is
configured for 2.5 V, thus providing a 4 V full-scale input span,
the voltages appear at CAPT and CAPB are 3.0 V and 1.0 V
respectively. For proper operation when using the internal or an
external reference, it is necessary to add a capacitor network to
decouple the CAPT and CAPB pins. Figure 67 shows the
recommended decoupling network. This capacitive network
performs the following three functions: (1) along with the
reference amplifier, A2, it provides a low source impedance over
a large frequency range to drive the A/D internal circuitry; (2) it
provides the necessary compensation for A2; and (3) it
Rev. C | Page 29 of 44
bandlimits the noise contribution from the reference. The turn-
on time of the reference voltage appearing between CAPT and
CAPB is approximately 15 ms and should be evaluated in any
power-down mode of operation.
0.1µF
Figure 67. Recommended Reference Decoupling Network
+
10µF
V
SENSE
REFCOM
REF
AD9260
CAPB
CAPT
0.1µF
+
10µF
0.1µF
0.1µF
AD9260
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