ADC12DL080 datasheet(3/24 Pages) NSC

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Pin Descriptions and Equivalent Circuits

Pin No.

Symbol

Equivalent Circuit

Description

ANALOG I/O

INA+

INB+

Differential analog input pins. With a 1.0V reference voltage the

differential full-scale input signal level is 2.0 V

P-P with each

input pin voltage centered on a common mode voltage, V

CM.

The negative input pins may be connected to V

CM for

single-ended operation, but a differential input signal is

required for best performance.

INA−

INB−

REF

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

REF is tied HIGH, the internal 1.0V reference is selected.

REFSEL/DCS must be LOW or tied to V

RMAorVRMB.

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

REF should be

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

RMAorVRMB.

See Table 3 in Section 2.2 for more information.

REFSEL/DCS

This pin is used in conjunction with V

REF (pin 7) to select the

reference source and turn the Duty Cycle Stabilizer (DCS) on

or off.

When REFSEL/DCS is LOW and V

REF is HIGH, the internal

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

REF input.

DCS is On.

With this pin connected to V

RMAorVRMB, DCS is Off.

See Table 3 in Section 2.2 for more information.

RPA

RPB

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

RPA and VRNA pins and

between the V

RPB and VRNB pins.

These pins should not be loaded.

RMA

RMB

RNA

RNB

DIGITAL I/O

CLK

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.

ADC12DL080 Datasheet(PDF) 3 Page - National Semiconductor (TI)

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