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ADN2813 Datasheet(PDF) 18 Page - Analog Devices

No. de Pieza. ADN2813
Descripción  Continuous Rate 10 Mb/s to 1.25 Gb/s Clock and Data Recovery IC with Integrated Limiting Amp
Descarga  28 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADN2813 Datasheet(HTML) 18 Page - Analog Devices

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ADN2813
Rev. 0 | Page 18 of 28
SQUELCH MODE
Two SQUELCH modes are available with the ADN2813.
SQUELCH DATAOUT and CLKOUT mode is selected when
CTRLC[1] = 0 (default mode). In this mode, when the
SQUELCH input, Pin 27, is driven to a TTL high state, both
the clock and data outputs are set to the zero state to suppress
downstream processing. If the SQUELCH function is not
required, Pin 27 should be tied to VEE.
SQUELCH DATAOUT or CLKOUT mode is selected when
CTRLC[1] is 1. In this mode, when the SQUELCH input is
driven to a high state, the DATAOUTN/DATA OUTP pins are
squelched. When the SQUELCH input is driven to a low state,
the CLKOUT pins are squelched. This is especially useful in
repeater applications, where the recovered clock may not be
needed.
I2C INTERFACE
The ADN2813 supports a 2-wire, I2C-compatible serial bus
driving multiple peripherals. Two inputs, serial data (SDA) and
serial clock (SCK), carry information between any devices
connected to the bus. Each slave device is recognized by a
unique address. The ADN2813 has two possible 7-bit slave
addresses for both read and write operations. The MSB of the
7-bit slave address is factory programmed to 1. B5 of the slave
address is set by Pin 19, SADDR5. Slave Address Bits [4:0] are
defaulted to all 0s. The slave address consists of the 7 MSBs of
an 8-bit word. The LSB of the word either sets a read or write
operation (see Figure 7). Logic 1 corresponds to a read
operation, while Logic 0 corresponds to a write operation.
To control the device on the bus, the following protocol must be
followed. First, the master initiates a data transfer by establish-
ing a start condition, defined by a high-to-low transition on
SDA while SCK remains high. This indicates that an address/
data stream follows. All peripherals respond to the start
condition and shift the next eight bits (the 7-bit address and
the R/W bit). The bits are transferred from MSB to LSB. The
peripheral that recognizes the transmitted address responds by
pulling the data line low during the ninth clock pulse. This is
known as an acknowledge bit. All other devices withdraw from
the bus at this point and maintain an idle condition. The idle
condition is where the device monitors the SDA and SCK lines
waiting for the start condition and correct transmitted address.
The R/W bit determines the direction of the data. Logic 0 on
the LSB of the first byte means that the master writes
information to the peripheral. Logic 1 on the LSB of the
first byte means that the master reads information from the
peripheral.
The ADN2813 acts as a standard slave device on the bus.
The data on the SDA pin is eight bits long, supporting the
7-bit addresses, plus the R/W bit. The ADN2813 has eight
subaddresses to enable the user-accessible internal registers
(see Table 6 through Table 10). It, therefore, interprets the first
byte as the device address and the second byte as the starting
subaddress. Auto-increment mode is supported, allowing data
to be read from or written to the starting subaddress and each
subsequent address without manually addressing the subsequent
subaddress. A data transfer is always terminated by a stop
condition. The user can also access any unique subaddress
register on a one-by-one basis without updating all registers.
Stop and start conditions can be detected at any stage of the
data transfer. If these conditions are asserted out of sequence
with normal read and write operations, they cause an immediate
jump to the idle condition. During a given SCK high period, the
user should issue one start condition, one stop condition, or a
single stop condition followed by a single start condition. If an
invalid subaddress is issued by the user, the ADN2813 does not
issue an acknowledge and returns to the idle condition. If the
user exceeds the highest subaddress while reading back in
auto-increment mode, then the highest subaddress register
contents continue to be output until the master device
issues a no acknowledge. This indicates the end of a read. In a
no acknowledge condition, the SDATA line is not pulled low
on the ninth pulse. See Figure 8 and Figure 9 for sample read
and write data transfers and Figure 10 for a more detailed
timing diagram.
REFERENCE CLOCK (OPTIONAL)
A reference clock is not required to perform clock and data
recovery with the ADN2813. However, support for an optional
reference clock is provided. The reference clock can be driven
differentially or single-ended. If the reference clock is not being
used, then REFCLKP should be tied to VCC, and REFCLKN
can be left floating or tied to VEE (the inputs are internally
terminated to VCC/2). See Figure 21 through Figure 23 for
sample configurations.
The REFCLK input buffer accepts any differential signal with a
peak-to-peak differential amplitude of greater than 100 mV (for
example, LVPECL or LVDS) or a standard single-ended, low
voltage TTL input, providing maximum system flexibility.
Phase noise and duty cycle of the reference clock are not
critical, and 100 ppm accuracy is sufficient.


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