EVAL-AD7994CB Analog Devices Inc, EVAL-AD7994CB Datasheet - Page 23
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EVAL-AD7994CB
Manufacturer Part Number
EVAL-AD7994CB
Description
BOARD EVALUATION FOR AD7994
Manufacturer
Analog Devices Inc
Specifications of EVAL-AD7994CB
Number Of Adc's
1
Number Of Bits
12
Sampling Rate (per Second)
188k
Data Interface
Serial
Inputs Per Adc
4 Single Ended
Input Range
0 ~ 5.5 V
Power (typ) @ Conditions
7.7mW @ 188kSPS, 5.5 V
Voltage Supply Source
Single
Operating Temperature
-40°C ~ 125°C
Utilized Ic / Part
AD7994
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
SERIAL INTERFACE
Control of the AD7993/AD7994 is carried out via the I
compatible serial bus. The AD7993/AD7994 is connected to
this bus as a slave device under the control of a master device,
for example, the processor.
SERIAL BUS ADDRESS
Like all I
7-bit serial address. The 3 MSB of this address for the AD7993/
AD7994 are set to 010. The AD7993/AD7994 come in two
versions, the AD7993-0/AD7994-0 and AD7993-1AD7994-1.
The two versions have three different I
which are selected by either tying the address select pin, AS, to
AGND or V
different addresses for the two versions, up to five AD7993/
AD7994 devices can be connected to a single serial bus, or the
addresses can be set to avoid conflicts with other devices on the
bus. See Table 6.
The serial bus protocol operates as follows:
The master initiates data transfer by establishing a start
condition, defined as a high-to-low transition on the serial data
line SDA while the serial clock line, SCL, remains high. This
indicates that an address/data stream will follow. All slave
peripherals connected to the serial bus respond to the start
condition and shift in the next eight bits, consisting of a 7-bit
address (MSB first) plus an R/ W bit that determines the
direction of the data transfer, that is, whether data is written to
or read from the slave device.
The peripheral whose address corresponds to the transmitted
address responds by pulling the data line low during the low
period before the ninth clock pulse, known as the acknowledge
bit. All other devices on the bus now remain idle while the
selected device waits for data to be read from or written to it. If
the R/ W bit is a 0, the master writes to the slave device. If the
R/ W bit is a 1, the master reads from the slave device.
2
C-compatible devices, the AD7993/AD7994 have a
DD
, or by letting the pin float (see Table 6). By giving
2
C addresses available,
2
C-
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Data is sent over the serial bus in sequences of nine clock
pulses, eight bits of data followed by an acknowledge bit from
the receiver of data. Transitions on the data line must occur
during the low period of the clock signal and remain stable
during the high period because a low-to-high transition when
the clock is high may be interpreted as a stop signal.
When all data bytes have been read or written, stop conditions
are established. In write mode, the master pulls the data line
high during the 10th clock pulse to assert a stop condition. In
read mode, the master device pulls the data line high during the
low period before the ninth clock pulse. This is known as No
Acknowledge. The master then takes the data line low during
the low period before the 10th clock pulse, then high during the
10th clock pulse to assert a stop condition.
Any number of bytes of data may be transferred over the serial
bus in one operation, but it is not possible to mix read and write
in one operation, because the type of operation is determined at
the beginning and cannot subsequently be changed without
starting a new operation.
AD7993/AD7994