Datasheet LTC2453 (Analog Devices) - 6

LTC2453
PIN FUNCTIONS GND (Pin 1):
Ground. Connect to a ground plane through
SCL (Pin 7):
Serial Clock Input of the I2C Interface. The a low impedance connection. LTC2453 can only act as a slave and the SCL pin only ac-
REF– (Pin 2), REF+ (Pin 3):
Differential Reference Input. cepts external serial clock. Data is shifted into the SDA pin The voltage on these pins can have any value between on the rising edges of SCL and output through the SDA GND and V pin on the falling edges of SCL. CC as long as the reference positive input, REF+, remains more positive than the negative reference input,
SDA (Pin 8):
Bidirectional Serial Data Line of the I2C REF–, by at least 2.5V. The differential reference voltage Interface. The conversion result is output through the (VREF = REF+ to REF–) sets the full-scale range. SDA pin. The pin is high impedance unless the LTC2453
V
is in the data output mode. While the LTC2453 is in the
CC (Pin 4):
Positive Supply Voltage. Bypass to GND (Pin 1) with a 10µF capacitor in parallel with a low-series- data output mode, SDA is an open drain pull down (which inductance 0.1µF capacitor located as close to the part as requires an external 1.7k pull-up resistor to VCC). possible.
Exposed Pad (Pin 9, DFN Only):
Ground. Must be soldered
IN– (Pin 5), IN+ (Pin 6):
Differential Analog Input. to PCB ground.
BLOCK DIAGRAM
3 4 REF+ VCC SCL IN+ 16-BIT ∆∑ 6 I2C 7 A/D CONVERTER SDA INTERFACE 8 DECIMATING – SINC FILTER IN– 16-BIT ∆∑ 5 A/D CONVERTER INTERNAL OSCILLATOR REF– GND 2 1 2453 BD 2453fc 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Analog Inputs And References Power Requirements I2C Inputs And Outputs I2C Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Application Package Description Revision History Related Parts