adc12dl066civs National Semiconductor Corporation, adc12dl066civs Datasheet - Page 3

• Manufacturer Part Number: adc12dl066civs
• Description: Dual 12-bit, 66 Msps, 450 Mhz Input Bandwidth A/d Converter W/internal Reference
• Manufacturer: National Semiconductor Corporation

ANALOG I/O
DIGITAL I/O
Pin Descriptions and Equivalent Circuits
Pin No.
15
16
11
13
14
12
60
22
41
59
21
2
1
7
5
4
6
INT/EXT REF
Symbol
V
V
V
V
V
V
V
V
V
V
V
OEA
OEB
CLK
PD
OF
IN
IN
IN
IN
RM
RM
RN
RN
RP
RP
REF
A+
B+
A−
B−
A
B
A
B
A
B
Equivalent Circuit
3
Differential analog input pins. With a 1.0V reference voltage
the differential full-scale input signal level is 2.0 V
each input pin voltage centered on a common mode voltage,
V
single-ended operation, but a differential input signal is
required for best performance.
Reference input. This pin should be bypassed to AGND with
a 0.1 µF capacitor when an external reference is used. V
is 1.0V nominal and should be between 0.8V to 1.5V.
Reference source select pin. With a logic low at this pin the
internal 1.0V reference is selected and the V
not be driven. With a logic high on this pin an external
reference voltage should be applied to V
These pins are high impedance reference bypass pins only;
they are not reference output pins. Bypass per Section 1.2.
DO NOT LOAD these pins.
Digital clock input. The range of frequencies for this input is
as specified in the electrical tables with guaranteed
performance at 66 MHz. The input is sampled on the rising
edge of this input.
OEA and OEB are the output enable pins that, when low,
holds their respective data output pins in the active state.
When either of these pins is high, the corresponding outputs
are in a high impedance state.
PD is the Power Down input pin. When high, this input puts
the converter into the power down mode. When this pin is
low, the converter is in the active mode.
Output Format pin. A logic low on this pin causes output
data to be in offset binary format. A logic high on this pin
causes the output data to be in 2’s complement format.
CM
. The negative input pins may be connected to V
Description
REF
REF
input pin 7.
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pin need
P-P
CM
with
for
REF