LTC2471CDD datasheet(9/20 Pages) LINER

Part #	LTC2471CDD

Description	Selectable 250sps/1ksps, 16-Bit I2C ?誇 ADCs with 10ppm/째C Max Precision Reference

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Manufacturer	LINER [Linear Technology]

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LTC2471/LTC2473

9

24713f

Ease of Use

The LTC2471/LTC2473 data output has no latency, ﬁlter

settling delay, or redundant results associated with the

conversion cycle. There is a one-to-one correspondence

between the conversion and the output data. Therefore,

multiplexing multiple analog input voltages requires no

special actions.

The LTC2471/LTC2473 include a proprietary input sampling

scheme that reduces the average input current by several

orders of magnitude when compared to traditional delta-

sigma architectures. This allows external ﬁlter networks

to interface directly to the LTC2471/LTC2473. Since the

average input sampling current is 50nA, an external RC

lowpass ﬁlter using 1kΩ and 0.1μF results in <1LSB

additional error. Additionally, there is negligible leakage

current between IN+ and IN– (for the LTC2473).

Input Voltage Range (LTC2471)

Ignoring offset and full-scale errors, the LTC2471 will

theoretically output an “all zero” digital result when the

input is at ground (a zero scale input) and an “all one”

digital result when the input is at VREF or higher (VREFOUT

= 1.25V). In an underrange condition (for all input voltages

below zero scale) the converter will generate the output

code 0. In an overrange condition (for all input voltages

greater than VREF) the converter will generate the output

code 65535.

Input Voltage Range (LTC2473)

As detailed in the Output Data Format section, the output

code is given as INT(32767.5 • (VIN+–VIN–)/VREF+32767.5.

For (VIN+ – VIN–) ≥ VREF, the output code is clamped at

65535 (all ones). For (VIN+ – VIN–) ≤ –VREF, the output

code is clamped at 0 (all zeroes).

APPLICATIONS INFORMATION

I2C INTERFACE

The LTC2471/LTC2473 communicate through an I2C in-

terface. The I2C interface is a 2-wire open-drain interface

supporting multiple devices and masters on a single bus.

The connected devices can only pull the data line (SDA)

LOW and can never drive it HIGH. SDA must be externally

connected to the supply through a pull-up resistor. When

the data line is free, it is HIGH. Data on the I2C bus can be

transferred at rates up to 100kbits/s in the Standard-Mode

and up to 400kbits/s in the Fast-Mode.

Upon entering the DATA INPUT/OUTPUT state, SDA outputs

the sign (D15) of the conversion result. During this state,

the ADC shifts the conversion result serially through the

SDA output pin under the control of the SCL input pin.

There is no latency in generating this data and the result

corresponds to the last completed conversion. A new bit

of data appears at the SDA pin following each falling edge

detected at the SCL input pin and appears from MSB to LSB.

The user can reliably latch this data on every rising edge

of the external serial clock signal driving the SCL pin.

Each device on the I2C bus is recognized by a unique

address stored in that device and can operate either as

a transmitter or receiver, depending on the function of

the device. In addition to transmitters and receivers,

devices can also be considered as masters or slaves when

performing data transfers. A master is the device which

initiates a data transfer on the bus and generates the

clock signals to permit that transfer. Devices addressed

by the master are considered a slave. The address of the

LTC2471/LTC2473 is 0010100 (if A0 is tied to GND) or

1010100 (if A0 is tied to VCC).

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