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ADC12D040 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. ADC12D040
Description  Dual 12-Bit, 40 MSPS, 600 mW A/D Converter with Internal/External Reference and Sample-and-Hold
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC12D040 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Pin Descriptions and Equivalent Circuits
Pin No.
Symbol
Equivalent Circuit
Description
ANALOG I/O
15
2
V
INA+
V
INB+
Non-Inverting analog signal Inputs. With a 2.0V reference
voltage each input signal level is 2.0 V
P-P centered on VCM.
16
1
V
INA−
V
INB−
Inverting analog signal Input. With a 2.0V reference voltage
the input signal level is from 2.0 V
P-P centered on VCM. This
pin may be connected to V
CM for single-ended operation, but
a differential input signal is required for best performance.
7V
REF
Reference input. This pin should be bypassed to AGND with
a 0.1 µF monolithic capacitor. V
REF is 2.0V nominal and
should be between 1.0V to 2.4V.
11
INT/EXT REF
V
REF select pin. With a logic low at this pin the internal 2.0V
reference is selected. With a logic high on this pin an external
reference voltage should be applied to V
REF input pin 7.
13
5
V
RPA
V
RPB
These pins are high impedance reference bypass pins only.
Connect a 0.1 µF capacitor from each of these pins to AGND.
DO NOT connect anything else to these pins.
12
6
V
RNA
V
RNB
14
4
V
RMA
V
RMB
DIGITAL I/O
60
CLK
Digital clock input. The range of frequencies for this input is
100 kHz to 50 MHz (typical) with guaranteed performance at
40 MHz. The input is sampled on the rising edge of this input.
22
41
OEA
OEB
OEA and OEB are the output enable pins that, when low,
enables their respective TRI-STATE data output pins. When
either of these pins is high, the corresponding outputs are in a
high impedance state.
59
PD
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.
21
OF
Output Format pin. A logic low on this pin causes output data
to be in straight binary. A logic high on this pin causes the
output data to be in 2’s complement format.
www.national.com
4


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