LTC2463 datasheet(7/20 Pages) LINER

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LTC2461/LTC2463

24613f

PIN FUNCTIONS

REFOUT (Pin 1): Reference Output Pin. Nominally 1.25V,

this voltage sets the fullscale input range of the ADC. For

noise and reference stability connect to a 0.1μF capacitor

tied to GND. This capacitor value must be less than or

equal to the capacitor tied to the reference compensation

pin (COMP). REFOUT cannot be overdriven by an external

reference. For applications that require an input range

greater than 0V to 1.25V, please refer to the LTC2451/

LTC2453.

COMP (Pin 2): Internal Reference Compensation Pin. For

low noise and reference stability, tie a 0.1μF capacitor to

GND.

A0 (Pin 3): Chip Address Control Pin. The A0 pin can be

tied to GND or VCC. If A0 is tied to GND, the LTC2461/

LTC2463 I2C address is 0010100. If A0 is tied to VCC, the

LTC2461/LTC2463 I2C address is 1010100.

GND (Pins 4, 7, 11): Ground. Connect directly to the

ground plane through a low impedance connection.

SCL (Pin 5): Serial Clock Input of the I2C Interface. The

LTC2461/LTC2463 can only act as a slave and the SCL pin

only accepts external serial clock. Data is shifted into the

SDA pin on the rising edges of SCL and output through

the SDA pin on the falling edges of SCL.

SDA (Pin 6): Bidirectional Serial Data Line of the I2C Inter-

face. The conversion result is output through the SDA pin.

The pin is high impedance unless the LTC2461/LTC2463

is in the data output mode. While the LTC2461/LTC2463

is in the data output mode, SDA is an open drain pull

down (which requires an external 1.7k pull-up resistor

to VCC).

REF– (Pin 8):

Negative Reference Input to the ADC. The

voltage on this pin sets the zero input to the ADC. This

pin should tie directly to ground or the ground sense of

the input sensor.

IN+ (LTC2463), IN (LTC2461) (Pin 9):

Positive input volt-

age for the LTC2463 differential device. ADC input for the

LTC2461 single-ended device.

IN– (LTC2463), GND (LTC2461) (Pin 10):

Negative input

voltage for the LTC2463 differential device. GND for the

LTC2461 single-ended device.

VCC (Pin 12): Positive Supply Voltage. Bypass to GND with

a 10μF capacitor in parallel with a low-series-inductance

0.1μF capacitor located as close to pin 12 as possible.

Exposed Pad (Pin 13 – DFN Package): Ground. Connect

directly to the ground plane through a low impedance

connection.

LTC2463 Datasheet(PDF) 7 Page - Linear Technology

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