AD1895AYRSRL Analog Devices Inc, AD1895AYRSRL Datasheet - Page 15

• Manufacturer Part Number: AD1895AYRSRL
• Description: IC SAMP-RATEHP/CONV 24BIT 28SSOP
• Manufacturer: Analog Devices Inc
• Type: Sample Rate Converterr

Specifications of AD1895AYRSRL

• Rohs Status: RoHS non-compliant
• Applications: Automotive Audio, receivers, set-top boxes
• Voltage - Supply, Digital: 3.13 V ~ 3.46 V
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• For Use With: EVAL-AD1895EB - BOARD EVAL FOR AD1895
• Voltage - Supply, Analog: -
• Lead Free Status / RoHS Status: Not Compliant

PRODUCT OVERVIEW
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
REV. B
TPC 49. THD + N vs. Frequency Input, 48 kHz: 44.1 kHz,
0 dBFS
TPC 50. THD + N vs. Frequency Input, 44.1 kHz: 48 kHz,
0 dBFS
–110
–120
–130
–140
–150
–160
–170
–180
–110
–120
–130
–140
–150
–160
–170
–180
2.5
2.5
5.0
5.0
(continued from page 1)
FREQUENCY – kHz
FREQUENCY – kHz
7.5
7.5
10.0
10.0
12.5
12.5
15.0
15.0
17.5
17.5
20.0
20.0
–15–
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.
TPC 51. THD + N vs. Frequency Input, 48 kHz: 96 kHz,
0 dBFS
TPC 52. THD + N vs. Frequency Input, 96 kHz: 48 kHz,
0 dBFS
–110
–120
–130
–140
–150
–160
–170
–180
–110
–120
–130
–140
–150
–160
–170
–180
2.5
2.5
5.0
5.0
FREQUENCY – kHz
FREQUENCY – kHz
7.5
7.5
10.0
10.0
12.5
12.5
15.0
15.0
AD1895
17.5
17.5
20.0
20.0