AD6679 datasheet(35/81 Pages) AD

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Data Sheet

AD6679

Rev. B | Page 35 of 81

10M

100M

10G

INPUT FREQUENCY (Hz)

25fs

50fs

75fs

100fs

125fs

150fs

175fs

200fs

Figure 58. Estimated SNR Degradation for the AD6679 vs.

Input Frequency and Jitter

POWER-DOWN/STANDBY MODE

The AD6679 has a PDWN/STBY pin that configures the device

in power-down or standby mode. The default operation is the

power-down function. The PDWN/STBY pin is a logic high

pin. The power-down option can also be set via Register 0x03F

and Register 0x040.

TEMPERATURE DIODE

The AD6679 contains a diode-based temperature sensor for

measuring the temperature of the die. This diode can output a

voltage and serve as a coarse temperature sensor to monitor the

internal die temperature.

The temperature diode voltage can be output to the FD_A pin

using the SPI. Use Register 0x028, Bit 0, to enable or disable the

diode. Register 0x028 is a local register. Channel A must be

selected in the device index register (Register 0x008) to enable

the temperature diode readout. Configure the FD_A pin to

output the diode voltage by programming Register 0x040,

Bits[2:0]. See Table 41 for more information.

The voltage response of the temperature diode (with SPIVDD =

1.8 V) is shown in Figure 59.

TEMPERATURE (°C)

0.60

0.65

0.70

0.75

0.80

0.85

0.90

–55 –45 –35 –25 –15 –5

15 25 35 45 55 65 75 85 95 105 115 125

Figure 59. Temperature Diode Voltage vs. Temperature

AD6679 Datasheet(PDF) 35 Page - Analog Devices

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