AD9546SLASHPCBZ datasheet(29/205 Pages) AD

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Data Sheet

AD9546

Rev. 0 | Page 29 of 205

ANALOG LOOPBACK (ROUND TRIP DELAY) SPECIFICATIONS

The data in Table 29 reflects REFB configured for dc-coupled 1.2 V CMOS. The data for Path A captures the delay associated with the

path from the REFB receiver through the loopback selection mux to the M4 pin driver and the effect of operating the M4 driver with

nominal supply voltages of 1.8 V, 2.5 V, and 3.3 V. The data for Path B captures the delay associated with the reference divider. The data

for Path C captures the delay associated with the reference demodulator. See Figure 56 for a depiction of the three paths (A, B, and C).

In the upper propagation delay section of Table 29, the tabulated values include variation of supply voltage from nominal and

temperature variation.

In the lower propagation delay section of Table 29, the tabulated values include only variation of supply voltage from nominal. This data

is useful when the user has the means to correct for delay variation due to temperature by using the tabulated temperature coefficients to

apply an offset to round trip delay measurements.

The M4 output section of Table 29 specifies the output drive capability of the M4 pin driver when operating in analog loopback mode.

Table 29.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

PROPAGATION DELAY

See Figure 56 for path details

REFB TO M4 Accounting for Supply

Variation from Nominal and

Temperature Variation

Path A

VDDIOB = 1.8 V

2.09

2.54

3.00

VDDIOB = 2.5 V

1.79

2.09

2.45

VDDIOB = 3.3 V

1.63

1.91

2.22

Path B

VDDIOB = 1.8 V

R Divider > 1

2.95

3.57

4.20

R Divider = 1

2.76

3.33

3.90

Path C

4.14

5.11

6.06

VDDIOB = 1.8 V

REFB to M4 Accounting for Supply

Variation from Nominal

See Figure 56 for path details

Path A

VDDIOB = 1.8 V

2.41

2.54

2.66

Temperature Coefficient

4.12

ps/°C

VDDIOB = 2.5 V

1.98

2.09

2.20

Temperature Coefficient

2.92

ps/°C

VDDIOB = 3.3 V

1.81

1.91

2.02

Temperature Coefficient

2.33

ps/°C

Path B

VDDIOB = 1.8 V

R Divider > 1

3.32

3.57

3.80

Temperature Coefficient

4.82

ps/°C

R Divider = 1

3.12

3.33

3.52

Temperature Coefficient

4.73

ps/°C

Path C

4.75

5.11

5.45

VDDIOB = 1.8 V

Temperature Coefficient

7.60

ps/°C

M4 OUTPUT SPECIFICATION

Applies only for analog loopback operation;

5 pF capacitive load

Frequency range

125

MHz

Maximum limit applies for full output voltage swing

with VDDIOB = 1.8 V, 2.5 V, or 3.3 V; output voltage

swing degrades for frequencies above 125 MHz

Pulse Width High

Minimum duration of positive half cycle that supports

full output voltage swing; positive output voltage

swing degrades for frequencies above 125 MHz or for

pulse width < 3 ns

Pulse Width Low

Minimum duration of negative half cycle that supports

full output voltage swing; negative output voltage

swing degrades for frequencies above 125 MHz or for

pulse width < 3 ns

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