ADC12040EVAL National Semiconductor, ADC12040EVAL Datasheet - Page 16

• Manufacturer Part Number: ADC12040EVAL
• Description: BOARD EVALUATION FOR ADC12040
• Manufacturer: National Semiconductor

Specifications of ADC12040EVAL

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 40M
• Data Interface: Parallel
• Inputs Per Adc: 1 Differential
• Input Range: 2 Vpp
• Power (typ) @ Conditions: 340mW @ 40MSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: ADC12040
• Lead Free Status / RoHS Status: Not applicable / Not applicable

www.national.com
4.0 POWER SUPPLY CONSIDERATIONS
The power supply pins should be bypassed with a 10 µF ca-
pacitor and with a 0.1 µF ceramic chip capacitor within a
centimeter of each power pin. Leadless chip capacitors are
preferred because they have low series inductance.
As is the case with all high-speed converters, the ADC12040
is sensitive to power supply noise. Accordingly, the noise on
the analog supply pin should be kept below 150 mV
No pin should ever have a voltage on it that is in excess of the
supply voltages, not even on a transient basis. Be especially
careful of this during turn on and turn off of power.
FIGURE 6. Driving the Signal Inputs with a Transformer
FIGURE 5. Differential Drive Circuit of Figure 4
P-P
.
16
The V
operated from a supply in the range of 2.35V to V
5V). This can simplify interfacing to 3V devices and systems.
DO NOT operate the V
5.0 LAYOUT AND GROUNDING
Proper grounding and proper routing of all signals are essen-
tial to ensure accurate conversion. Maintaining separate ana-
log and digital areas of the board, with the ADC12040
between these areas, is required to achieve specified perfor-
mance.
The ground return for the data outputs (DR GND) carries the
ground current for the output drivers. The output current can
DR
pin provides power for the output drivers and may be
20014814
DR
pin at a voltage higher than V
20014815
D
(nominal
D
.