EVAL-AD7799EBZ Analog Devices Inc, EVAL-AD7799EBZ Datasheet - Page 21

• Manufacturer Part Number: EVAL-AD7799EBZ
• Description: BOARD EVALUATION FOR AD7799
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7799EBZ

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 470
• Data Interface: Serial
• Inputs Per Adc: 3 Differential
• Input Range: ±VREF/gain
• Power (typ) @ Conditions: 2.5mW @ 470SPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 105°C
• Utilized Ic / Part: AD7799
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Continuous Read
Rather than write to the communication register to access the
data each time a conversion is complete, the AD7798/AD7799
can be configured so that the conversions are placed on the
DOUT/ RDY line automatically. By writing 01011100 to the
communication register, the user need only apply the
appropriate number of SCLK cycles to the ADC, and the
16-/24-bit word is automatically placed on the DOUT/ RDY line
when a conversion is complete. The ADC should be configured
for continuous conversion mode.
When DOUT/ RDY goes low to indicate the end of a conversion,
sufficient SCLK cycles must be applied to the ADC, and the
data conversion is placed on the DOUT/ RDY line. When the
conversion is read, DOUT/ RDY returns high until the next
conversion is available. In this mode, the data can only be read
once. In addition, the user must ensure that the data-word is
DOUT/RDY
SCLK
DIN
CS
0x5C
Figure 18. Continuous Read
Rev. A | Page 21 of 28
DATA
read before the next conversion is complete. If the user does not
read the conversion before the completion of the next conversion,
or if insufficient serial clocks are applied to the AD7798/AD7799
to read the word, the serial output register is reset when the
next conversion is complete, and the new conversion is placed
in the output serial register.
To exit the continuous-read mode, the instruction 01011000
must be written to the communication register while the
DOUT/ RDY pin is low. While in continuous-read mode, the
ADC monitors activity on the DIN line in case the instruction
to exit the continuous-read mode occurs. Additionally, a reset
occurs if 32 consecutive 1s are seen on DIN. Therefore, DIN
should be held low in continuous-read mode until an
instruction is written to the device.
DATA
AD7798/AD7799
DATA