ADS5545 datasheet(42/54 Pages) TI

Part #	ADS5545

Description	11-BIT, 200 MSPS ADC

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Manufacturer	TI [Texas Instruments]

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Output Clock Position Programmability

Output Data Format

Out-of-Range Indicator (OVR)

POL − Positiveoverloadcode

0x7FFforstraightbinary

0x3FFfor2scomplement

NOL − Negativeoverloadcode

0x000forstraightbinary

0x400for2scomplement

Output Timing

ADS5517

SLWS203 – DECEMBER 2007

In both the LVDS and CMOS modes, the output clock can be moved around its default position. This can be

done using SEN pin 27 (as described in Table 5) or using the serial interface register bits <CLKOUT POSN>

(Table 9). Using this allows to trade-off the setup and hold times leading to reliable data capture. There also

exists an option to align the output clock edge with the data transition.

Note that programming the output clock position also affects the clock propagation delay times.

Two output data formats are supported – 2's complement and offset binary. They can be selected using the DFS

(pin 6) or the serial interface register bit <DF> (Table 10).

When the input voltage exceeds the full-scale range of the ADC, OVR (pin 3) goes high, and the output code is

clamped to the appropriate full-scale level for the duration of the overload. For a positive overdrive, the output

code is 0x7FF in offset binary output format, and 0x3FF in 2's complement output format. For a negative input

overdrive, the output code is 0x000 in offset binary output format and 0x400 in 2's complement output format.

Figure 45 shows the behavior of OVR during the overload. Note that OVR and the output code react to the

overload after a latency of 14 clock cycles.

Figure 45. OVR During Input Overvoltage

For the best performance at high sampling frequencies, ADS5517 uses a clock generator circuit to derive internal

timing for ADC. This results in optimal setup and hold times of the output data and 50% output clock duty cycle

for sampling frequencies from 80 MSPS to 200 MSPS. See Table 20 for timing information above 80 MSPS.

42

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