LTC2453_1 Datasheet, PDF (6/18 Pages) Linear Technology – Ultra-Tiny, Differential, 16-Bit ΔΣ ADC With I2C Interface

LTC2453
PIN FUNCTIONS
GND (Pin 1): Ground. Connect to a ground plane through
a low impedance connection.
REF^– (Pin 2), REF⁺ (Pin 3): Differential Reference Input.
The voltage on these pins can have any value between
GND and V_CC as long as the reference positive input, REF⁺,
remains more positive than the negative reference input,
REF^–, by at least 2.5V. The differential reference voltage
(V_REF = REF⁺ to REF^–) sets the full-scale range.
V_CC (Pin 4): Positive Supply Voltage. Bypass to GND
(Pin 1) with a 10μF capacitor in parallel with a low-se-
ries-inductance 0.1μF capacitor located as close to the
part as possible.
IN^– (Pin 5), IN⁺ (Pin 6): Differential Analog Input.
SCL (Pin 7): Serial Clock Input of the I²C Interface. The
LTC2453 can only act as a slave and the SCL pin only ac-
cepts 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 8): Bidirectional Serial Data Line of the I²C
Interface. The conversion result is output through the
SDA pin. The pin is high impedance unless the LTC2453
is in the data output mode. While the LTC2453 is in the
data output mode, SDA is an open drain pull down (which
requires an external 1.7k pull-up resistor to V_CC).
Exposed Pad (Pin 9, DFN Only): Ground. Must be soldered
to PCB ground.
BLOCK DIAGRAM
3 _REF+
4
V_CC
IN⁺
6
5 ^IN–
16-BIT Δ∑
A/D CONVERTER
–
16-BIT Δ∑
A/D CONVERTER
DECIMATING
SINC FILTER
REF^–
2
GND
1
I²C
INTERFACE
SCL
7
SDA ₈
INTERNAL
OSCILLATOR
2453 BD
2453fb
6