LTC1992 datasheet(8/24 Pages) LINER

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LTC2369-18

236918fa

CHAIN (Pin 1): Chain Mode Selector Pin. When low, the

LTC2369-18 operates in normal mode and the RDL/SDI

input pin functions to enable or disable SDO. When high,

the LTC2369-18 operates in chain mode and the RDL/SDI

pin functions as SDI, the daisy-chain serial data input.

Logic levels are determined by OVDD.

VDD (Pin 2): 2.5V Power Supply. The range of VDD is

2.375V to 2.625V. Bypass VDD to GND with a 10μF ceramic

capacitor.

GND (Pins 3, 6, 10 and 16): Ground.

IN+ (Pin 4):

Analog Input. IN+ operates differential with

respect to IN– with an IN+-IN– range of 0V to VREF.

IN– (Pin 5):

Analog Ground Sense. IN– has an input range

of ±100mV with respect to GND and must be tied to the

ground plane or a remote ground sense.

REF (Pins 7, 8): Reference Inputs. The range of REF is 2.5V

to 5.1V. This pin is referred to the GND pin and should be

decoupled closely to the pin with a 47μF ceramic capacitor

(X5R, 0805 size).

CNV (Pin 9): Convert Input. A rising edge on this input

powers up the part and initiates a new conversion. Logic

levels are determined by OVDD.

BUSY (Pin 11): BUSY Indicator. Goes high at the start of

a new conversion and returns low when the conversion

has finished. Logic levels are determined by OVDD.

RDL/SDI (Pin 12): When CHAIN is low, the part is in nor-

mal mode and the pin is treated as a bus enabling input.

When CHAIN is high, the part is in chain mode and the

pin is treated as a serial data input pin where data from

another ADC in the daisy chain is input. Logic levels are

determined by OVDD.

SCK (Pin 13): Serial Data Clock Input. When SDO is enabled,

the conversion result or daisy-chain data from another

ADC is shifted out on the rising edges of this clock MSB

first. Logic levels are determined by OVDD.

SDO (Pin 14): Serial Data Output. The conversion result

or daisy-chain data is output on this pin on each rising

edge of SCK MSB first. The output data is in straight binary

format. Logic levels are determined by OVDD.

OVDD (Pin 15): I/O Interface Digital Power. The range of

OVDD is 1.71V to 5.25V. This supply is nominally set to

the same supply as the host interface (1.8V, 2.5V, 3.3V,

or 5V). Bypass OVDD to GND with a 0.1μF capacitor.

GND (Exposed Pad Pin 17, DFN Package Only): Ground.

Exposed pad must be soldered directly to the ground plane.

PIN FUNCTIONS

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