adc12dl080civs National Semiconductor Corporation, adc12dl080civs Datasheet - Page 3

• Manufacturer Part Number: adc12dl080civs
• Description: Dual 12-bit, 80 Msps, A/d Converter For If Sampling
• Manufacturer: National Semiconductor Corporation

ANALOG I/O
DIGITAL I/O
Pin Descriptions and Equivalent Circuits
Pin No.
15
16
11
13
14
12
60
2
1
7
5
4
6
REFSEL/DCS
Symbol
V
V
V
V
V
V
V
V
V
V
V
CLK
IN
IN
IN
IN
RM
RM
RP
RP
RN
RN
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
input pin voltage centered on a common mode voltage, V
The negative input pins may be connected to V
single-ended operation, but a differential input signal is
required for best performance.
This pin is used in conjunction with REFSEL/DCS (pin 11) to
select the internal 1.0V reference, or as the external reference
input.
If V
REFSEL/DCS must be LOW or tied to V
If a voltage in the range of 0.8V to 1.2V is applied to this pin,
that voltage is used as the reference. V
bypassed to AGND with a 0.1 µF low ESL capacitor when an
external reference is used. The nominal external reference
voltage is 1.0V but values in the range of 0.8V to 1.2V may be
used. REFSEL/DCS must be HIGH or tied to V
See Table 3 in Section 2.2 for more information.
This pin is used in conjunction with V
reference source and turn the Duty Cycle Stabilizer (DCS) on
or off.
When REFSEL/DCS is LOW and V
1.0V reference is selected and DCS is On.
When REFSEL/DCS is HIGH, an external reference voltage in
the range of 0.8V to 1.2V should be applied to the V
DCS is On.
With this pin connected to V
See Table 3 in Section 2.2 for more information.
These are reference bypass pins. These pins should each be
bypassed to ground with a 0.1 µF capacitor. A 10 µF capacitor
should be placed between the V
between the V
These pins should not be loaded.
Digital clock input. The range of frequencies for this input is as
specified in the electrical tables with guaranteed performance
at 80 MHz. The inputs are sampled on the rising edge.
REF
is tied HIGH, the internal 1.0V reference is selected.
RP
B and V
RN
Description
B pins.
RM
A or V
RP
A and V
REF
REF
RM
REF
is HIGH, the internal
B, DCS is Off.
RM
(pin 7) to select the
RN
A or V
should be
A pins and
P-P
RM
CM
with each
RM
A or V
www.national.com
for
B.
REF
RM
input.
CM
B.
.