adc1204006 National Semiconductor Corporation, adc1204006 Datasheet - Page 4

• Manufacturer Part Number: adc1204006
• Description: 12-bit, 40 Msps, 340 Mw A/d Converter With Internal Sample-and-hold
• Manufacturer: National Semiconductor Corporation

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ANALOG POWER
DIGITAL POWER
Pin Descriptions and Equivalent Circuits
Pin No.
5, 6, 29
4, 7, 28
14–19,
22–27
9, 12
13
21
20
DR GND
D0–D11
Symbol
AGND
DGND
V
V
V
DR
A
D
Equivalent Circuit
4
Digital data output pins that make up the 12-bit conversion
results. D0 is the LSB, while D11 is the MSB of the offset
binary output word. Output levels are TTL/CMOS compatible.
Positive analog supply pins. These pins should be connected
to a quiet +5V voltage source and bypassed to ground with
0.1 µF monolithic capacitors located within 1 cm of these
power pins, and with a 10 µF capacitor.
The ground return for the analog supply.
Positive digital supply pin. This pin should be connected to
the same quiet +5V source as is V
with a 0.1 µF monolithic capacitor in parallel with a 10 µF
capacitor, both located within 1 cm of the power pin.
The ground return for the digital supply.
Positive digital supply pin for the ADC12040’s output drivers.
This pin should be bypassed to ground with a 0.1 µF
monolithic capacitor. If the supply for this pin is different from
the supply used for V
with a 10 µF tantalum capacitor. V
voltage on V
1 cm of the supply pin.
The ground return for the digital supply for the ADC12040’s
output drivers. This pin should be connected to the system
ground, but not be connected in close proximity to the
ADC12040’s DGND or AGND pins. See Section 5 (Layout
and Grounding) for more details.
(Continued)
D
. All bypass capacitors should be located within
A
and V
Description
D
, it should also be bypassed
DR
A
and bypassed to ground
should never exceed the