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LM95213

100 pF

ADC12D1XXX

= I

100 pF

D1+

D2+

D-

FPGA

= I

ADC12D1800RF

SNAS518I –JULY 2011–REVISED JANUARY 2014

www.ti.com

In the following typical application, the LM95213 is used to monitor the temperature of an ADC12D1800RF

as well as an FPGA, see Figure 6-16. If this feature is unused, the Tdiode+/- pins may be left floating.

Figure 6-16. Typical Temperature Sensor Application

6.4.7.2 Clocking Device

The clock source can be a PLL/VCO device such as the LMX2531LQxxxx family of products. The specific

device should be selected according to the desired ADC sampling clock frequency. The

ADC12D1800RFRB uses the LMX2531LQ1778E, with the ADC clock source provided by the Aux PLL

output. Other devices which may be considered based on clock source, jitter cleaning, and distribution

purposes are the LMK01XXX, LMK02XXX, LMK03XXX and LMK04XXX product families.

6.4.7.3 Amplifiers for Analog Input

The following amplifiers can be used for ADC12D1800RF applications which require DC coupled input or

signal gain, neither of which can be provided with a transformer coupled input circuit:

Table 6-12. Amplifier Recommendation

Amplifier Bandwidth Brief features

LMH6552 1.5 GHz Configurable gain

LMH6553 900 MHz Output clamp and configurable gain

LMH6554 2.8 GHz Configurable gain

LMH6555 1.2 GHz Fixed gain

6.4.7.4 Balun Recommendations for Analog Input

The following baluns are recommended for the ADC12D1800RF for applications which require no gain.

When evaluating a balun for the application of driving an ADC, some important qualities to consider are

phase error and magnitude error.

Table 6-13. Balun Recommendations

Balun Bandwidth

Mini-Circuits TC1-1-13MA+ 4.5 - 3000 MHz

Anaren B0430J50100A00 400 - 3000 MHz

Mini-Circuits ADTL2-18 30 - 1800 MHz

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ADC 6 Spécifications Page 68