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AD1895 Datasheet(PDF) 15 Page - Analog Devices |
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AD1895 Datasheet(HTML) 15 Page - Analog Devices |
15 / 24 page ![]() REV. B AD1895 –15– PRODUCT OVERVIEW (continued from page 1) The digital servo loop measures the time difference between input and output sample rates within 5 ps. This is necessary in order to select the correct polyphase filter coefficient. The digital servo loop has excellent jitter rejection for both input and output sample rates as well as the master clock. The jitter rejection begins at less than 1 Hz. This requires a long settling time whenever RESET is deasserted or when the input or output sample rate changes. To reduce the settling time, upon deassertion of RESET or a change in a sample rate, the digital servo loop enters the Fast Settling Mode. When the digital servo loop has adequately settled in the Fast Mode, it switches into the Normal or Slow Settling Mode and continues to settle until the time difference measurement between input and output sample rates is within 5 ps. During Fast Mode, the MUTE_OUT signal is asserted high. Normally, the MUTE_OUT is connected to the MUTE_IN pin. The MUTE_IN signal is used to softly mute the AD1895 upon assertion and softly unmute the AD1895 when it is deasserted. The sample rate converter of the AD1895 can be bypassed altogether using the Bypass Mode. In Bypass Mode, the AD1895’s serial input data is directly passed to the serial output port with- out any dithering. This is useful for passing through nonaudio data or when the input and output sample rates are synchronous to one another and the sample rate ratio is exactly 1 to 1. The AD1895 is a 3.3 V, 5 V input tolerant part and is available in a 28-lead SSOP SMD package. The AD1895 is 5 V input tolerant only when the VDD_IO supply pin is supplied with 5 V. FREQUENCY – kHz –180 2.5 5.0 7.5 10.0 12.5 15.0 17.5 –170 –160 –150 –140 –130 –120 –110 20.0 TPC 49. THD + N vs. Frequency Input, 48 kHz: 44.1 kHz, 0 dBFS FREQUENCY – kHz –180 2.5 5.0 7.5 10.0 12.5 15.0 17.5 –170 –160 –150 –140 –130 –120 –110 20.0 TPC 50. THD + N vs. Frequency Input, 44.1 kHz: 48 kHz, 0 dBFS FREQUENCY – kHz –180 2.5 5.0 7.5 10.0 12.5 15.0 17.5 –170 –160 –150 –140 –130 –120 –110 20.0 TPC 51. THD + N vs. Frequency Input, 48 kHz: 96 kHz, 0 dBFS FREQUENCY – kHz –180 2.5 5.0 7.5 10.0 12.5 15.0 17.5 –170 –160 –150 –140 –130 –120 –110 20.0 TPC 52. THD + N vs. Frequency Input, 96 kHz: 48 kHz, 0 dBFS |
Similar Part No. - AD1895_15 |
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Similar Description - AD1895_15 |
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