LTC2984 datasheet(10/78 Pages) AD

10 / 78 page

LTC2984

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For more information www.linear.com/LTC2984

PIN FUNCTIONS

GND (Pins 1, 3, 5, 7, 9, 12, 15, 44): Ground. Connect

each of these pins to a common ground plane through a

lowimpedanceconnection.Alleightpinsmustbegrounded

for proper operation.

VDD (Pins 2, 4, 6, 8, 45): Analog Power Supply. Tie all

five pins together and bypass as close as possible to the

device, to ground with a 0.1µF capacitor.

VREF_BYP( Pin 11): Internal Reference Power. This is an

internal supply pin, do not load this pin with external

circuitry. Decouple with a 0.1µF capacitor to GND.

VREFOUT (Pin 13): Reference Output Voltage. Short to

VREFP. A minimum 1µF capacitor to ground is required.

Do not load this pin with external circuitry.

VREFP (Pin 14): Positive Reference Input. Tie to VREFOUT.

CH1 to CH20 (Pin 16 to Pin 35): Analog Inputs. May be

programmed for single-ended, differential, or ratiometric

operation. The voltage on these pins can have any value

between GND – 50mV and VDD – 0.3V. Unused pins can

be grounded or left floating.

COM (Pin 36): Analog Input. The common negative input

for all single-ended configurations. The voltage on this

pin can have any value between GND – 50mV and VDD –

0.3V. This pin is typically tied to ground for temperature

measurements.

INTERRUPT (Pin 37): This pin outputs a LOW when the

device is busy either during start-up or while a conversion

cycle is in progress. This pin goes HIGH at the conclusion

of the start-up state or conversion cycle.

SCK (Pin 38): Serial Clock Pin. Data is shifted out of the

device on the falling edge of SCK and latched by the device

on the rising edge.

SDO(Pin39):SerialDataOut.Duringthedataoutputstate,

this pin is used as the serial data output. When the chip

selectpinisHIGH,theSDOpinisinahighimpedancestate.

SDI(Pin40):SerialDataInput.Usedtoprogramthedevice.

Data is latched on the rising edge of SCK.

CS (Pin 41): Active Low Chip Select. A low on this pin

enables the digital input/output. A HIGH on this pin

places SDO in a high impedance state. A falling edge on

CS marks the beginning of a SPI transaction and a rising

edge marks the end.

RESET (Pin 42): Active Low Reset. While this pin is LOW,

the device is forced into the reset state. Once this pin is

returned HIGH, the device initiates its start-up sequence.

LDO (Pin 43): 2.5V LDO Output. Bypass with a 10µF

capacitor to GND. This is an internal supply pin, do not

load this pin with external circuitry.

Q3, Q2, Q1 (Pins 46, 47, 48): External Bypass Pins for

–200mV integrated Charge Pump. Tie a 10µF X7R capaci-

tor between Q1 and Q2 close to each pin. Tie a 10µF X5R

capacitor from Q3 to Ground. These are internal supply

pins, do not make additional connections.

LTC2984 Datasheet(PDF) 10 Page - Analog Devices

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