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AD9213 Datasheet(PDF) 63 Page - Analog Devices |
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AD9213 Datasheet(HTML) 63 Page - Analog Devices |
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63 / 110 page  Data Sheet AD9213 Rev. A | Page 63 of 110 LATENCY END TO END TOTAL LATENCY Total latency in the AD9213 is dependent on the chip application mode and the JESD204B configuration. For any given combination of these parameters, the latency is deterministic, however, the value of this deterministic latency must be calculated as described in the Example Latency Calculations section. Table 28 shows the combined latency through the ADC and DSP for the different chip application modes supported by the AD9213. Table 29 shows the latency through the JESD204B block for each application mode based on the M/L ratio. For both tables, latency is typical and is in units of the encode clock. The latency through the JESD204B block does not depend on the output data type (real or complex). Therefore, data type is not included in Table 28 and Table 29. To determine the total latency, select the appropriate ADC + DSP latency from Table 28 and add it to the appropriate JESD204B latency from Table 29. EXAMPLE LATENCY CALCULATIONS An example configuration with latency calculation is shown below: • ADC application mode = full bandwidth • Real outputs • L = 16, M = 1, F = 1, S = 8 (JESD204B mode) • M/L = 0.0625 • Latency = 187 encode clock periods + 180 encode clock periods = 367 encode clock periods LMFC REFERENCED LATENCY Some FPGA vendors may require the end user to know LMFC referenced latency to make appropriate deterministic latency adjustments. If they are required, the latency values in Table 28 and Table 29 can be used for the analog input to LMFC and LMFC to data output latency values, respectively. Table 28. Typical Latency Through the ADC + DSP Blocks (Number of Sample Clocks)1 Chip Application Mode Enabled Filters ADC + DSP Latency (Clock Cycles) Full Bandwidth Not applicable 180 DCM1, Real HB1 520 DCM2 Complex HB1 518 Real HB2 + HB1 866 DCM3, Real TB2 + HB1 1273 DCM4 Complex HB2 + HB1 894 Real HB3 +HB2 + HB1 1655 DCM6 Complex TB2 + HB1 1282 Real TB2 + HB2 + HB1 2339 DCM8 Complex HB3 +HB2 + HB1 1662 Real HB4 + HB3 + HB2 + HB1 3200 DCM12 Complex TB2 + HB2 + HB1 2428 Real TB2 + HB3 + HB2 + HB1 4540 DCM16 Complex HB4 + HB3 + HB2 + HB1 3201 Real HB5 + HB4 + HB3 + HB2 + HB1 6268 DCM24 Complex TB2 + HB3 + HB2 + HB1 4733 Real TB2 + HB4 + HB3 + HB2 + HB1 8582 DCM32 Complex HB5 + HB4 + HB3 + HB2 + HB1 6273 Real HB6 + HB5 + HB4 + HB3 + HB2 + HB1 12,415 DCM48 Complex TB2 + HB4 + HB3 + HB2 + HB1 9337 Real TB2 + HB5 + HB4 + HB3 + HB2 + HB1 17030 |
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