adc12d800rfrb National Semiconductor Corporation, adc12d800rfrb Datasheet - Page 8
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adc12d800rfrb
Manufacturer Part Number
adc12d800rfrb
Description
12-bit, 1.6/1.0 Gsps Rf Sampling Adc
Manufacturer
National Semiconductor Corporation
Datasheet
1.ADC12D800RFRB.pdf
(62 pages)
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Ball No.
C3/D3
C1/D2
E2/F3
C2
B1
Tdiode+/-
Rtrim+/-
Rext+/-
Name
V
V
CMO
BG
Equivalent Circuit
8
Description
Common Mode Voltage Output or Signal
Coupling Select. If AC-coupled operation at the
analog inputs is desired, this pin should be held
at logic-low level. This pin is capable of sourcing/
sinking up to 100 µA. For DC-coupled operation,
this pin should be left floating or terminated into
high-impedance. In DC-coupled Mode, this pin
provides an output voltage which is the optimal
common-mode voltage for the input signal and
should be used to set the common-mode voltage
of the driving buffer.
Bandgap Voltage Output or LVDS Common-
mode Voltage Select. This pin provides a
buffered version of the bandgap output voltage
and is capable of sourcing/sinking 100 uA and
driving a load of up to 80 pF. Alternately, this pin
may be used to select the LVDS digital output
common-mode voltage. If tied to logic-high, the
1.2V LVDS common-mode voltage is selected;
0.8V is the default.
External Reference Resistor terminals. A 3.3 kΩ
±0.1% resistor should be connected between
Rext+/-. The Rext resistor is used as a reference
to trim internal circuits which affect the linearity of
the converter; the value and precision of this
resistor should not be compromised.
Input Termination Trim Resistor terminals. A 3.3
kΩ ±0.1% resistor should be connected between
Rtrim+/-. The Rtrim resistor is used to establish
the calibrated 100Ω input impedance of VinI,
VinQ and CLK. These impedances may be fine
tuned by varying the value of the resistor by a
corresponding percentage; however, the tuning
range and performance is not guaranteed for
such an alternate value.
Temperature Sensor Diode Positive (Anode) and
Negative (Cathode) Terminals. This set of pins is
used for die temperature measurements. It has
not been fully characterized.
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