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AD9229BCP-50 Datasheet(PDF) 11 Page - Analog Devices

No. de pieza AD9229BCP-50
Descripción Electrónicos  Quad 12-Bit, 50/65 MSPS Serial LVDS 3V A/D Converter
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD9229BCP-50 Datasheet(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
AD9229
Rev. PrF | Page 11 of 15
Oct. 6, 2003
THEORY OF OPERATION
Analog Inputs
For best dynamic performance, the source impedances driving
VIN+ and VIN– should be matched such that common-mode
settling errors are symmetrical. These errors will be reduced by the
common-mode rejection of the A/D.
Voltage Reference
The AD9229 has a stable and accurate reference voltage on chip,
which sets the full-scale voltage at the analog input channels.
Internal reference mode is established by grounding the SENSE pin.
(Recommended decoupling capacitors shown below) The internal
reference can be bypassed by setting SENSE to AVDD and driving
VREF with an external 1V reference.
SENSE
ADC
CORE
SELECT
LOGIC
AD9229
VREF
VINB
VINA
REFB
REFT
0.1u F
10 uF
0.1uF
10 uF
0.1uF
0.1uF
0.5V
Internal Reference Mode Connection
Digital Outputs
The AD9229’s differential outputs conform to the ANSI-644 LVDS
standard. To set the LVDS bias current, place a resistor (RSET is
nominally equal to 3.6 kΩ) to ground at the LVDSBIAS pin. The
RSET resistor current (~ 1.2/RSET) is ratioed on-chip setting the
output current at each output equal to a nominal 3.5 mA. A 100 Ω
differential termination resistor placed at the LVDS receiver inputs
results in a nominal 350 mV swing at the receiver.
The AD9229’s LVDS outputs facilitate interfacing with LVDS
receivers in custom ASICs and FPGAs that have LVDS capability
for superior switching performance in noisy environments. Single
point-to-point net topologies are recommended with a 100 Ω
termination resistor as close to the receiver as possible. It is
recommended to keep the trace length no longer than 1–2 inches
and to keep differential output trace lengths as equal as possible.
The format of the output data is offset binary.
Timing
Data from each A/D is serialized and provided on a separate
channel.
Two output clocks are provided to assist in capturing data from the
AD9229. The data clock out (DCO) is used to clock the output
data and is equal to 6 times the sample clock frequency. ( 390MHz
for 65MHz input clock) Data is clocked out of the AD9229 on the
rising and falling edges of DCO. The FCO clock signals the start of
a new serial word, the rising edge of FCO occurs at the start of an
MSB.
PLL
The AD9229 contains an internal PLL that is used to generate
internal clocking signals, if the PLL is unlocked, the data outputs
are static.


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