ADC 6 Spécifications télécharger pdf (Page 67)

DCLK

1900

1710

time

660

635

1490

520

300

1210

Slope = 1.22V/ms

ADC12D1800RF

www.ti.com

SNAS518I –JULY 2011–REVISED JANUARY 2014

Figure 6-15. Supply and DCLK Ramping

6.4.7 RECOMMENDED SYSTEM CHIPS

TI recommends these other chips including temperature sensors, clocking devices, and amplifiers in order

to support the ADC12D1800RF in a system design.

6.4.7.1 Temperature Sensor

The ADC12D1800RF has an on-die temperature diode connected to pins Tdiode+/- which may be used to

monitor the die temperature. TI also provides a family of temperature sensors for this application which

monitor different numbers of external devices, see Table 6-11.

Table 6-11. Temperature Sensor Recommendation

Number of External Devices

Recommended Temperature Sensor

Monitored

1 LM95235

2 LM95213

4 LM95214

The temperature sensor (LM95235/13/14) is an 11-bit digital temperature sensor with a 2-wire System

Management Bus (SMBus) interface that can monitor the temperature of one, two, or four remote diodes

as well as its own temperature. It can be used to accurately monitor the temperature of up to one, two, or

four external devices such as the ADC12D1800RF, a FPGA, other system components, and the ambient

temperature.

The temperature sensor reports temperature in two different formats for +127.875°C/-128°C range and

0°/255°C range. It has a Sigma-Delta ADC core which provides the first level of noise immunity. For

improved performance in a noisy environment, the temperature sensor includes programmable digital

filters for Remote Diode temperature readings. When the digital filters are invoked, the resolution for the

Remote Diode readings increases to 0.03125°C. For maximum flexibility and best accuracy, the

temperature sensor includes offset registers that allow calibration for other types of diodes.

Diode fault detection circuitry in the temperature sensor can detect the absence or fault state of a remote

diode: whether D+ is shorted to the power supply, D- or ground, or floating.

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