EVAL-AD7689EDZ Analog Devices Inc, EVAL-AD7689EDZ Datasheet - Page 9

• Manufacturer Part Number: EVAL-AD7689EDZ
• Description: BOARD EVAL AD7689
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7689EDZ

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 250k
• Data Interface: Serial
• Inputs Per Adc: 8 Single Ended
• Input Range: ±VREF
• Power (typ) @ Conditions: 12.5mW @ 250kSPS, 5 V
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7689
• Silicon Manufacturer: Analog Devices
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: AD7689
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Preliminary Technical Data
ADC CONFIGURATION
The ADC needs to be configured for input configuration,
reference, channel to be converted, temperature sensor, and on-
chip low pass (LP) filter (optional) for full bandwidth (BW) or
¼ BW. These next figures show the pull down configurations
available. Note the default value when the program is started is
indicated by the √; or CFG writing enabled, unipolar INn to
GND, CH0, full BW, and external reference. Note that after
updating the CFG, the first conversion (when using burst
mode) will be of the last configuration since the ADC has a 1-
depp delay for the CFG.
Figure 3 shows the default values.
Figure 4 details CFG Write Enabled/Disabled. When enabled,
the MSB of the CFG is set high. When disabled the MSB is set
low thus the remaining 13 bits are ignored.
Figure 5 details the inputs (IN0-IN7) configuration and channel
selection. Refer to the datasheet for more information about the
input configure-ations. Note that in the bipolar mode, the input,
IN+ and COM (or IN-) must be centered around VREF/2.
Figure 4. CGF Enable/Disable Selection
Figure 3. Default CFG
Rev. PrD | Page 9 of 26
Figure 6 details the bandwidth selection of the 1-pole low pass
filter, which can reduce the noise from the amplifier circuit, if
desired. Note that the throughout of the converter must also
reduce to ¼ of the maximum when setting to ¼ BW.
Figure 7 details the reference selection. Note that the TEMP
sensor can be used with an external reference. The Temp sensor
can be used to monitor the temperature of the ADC and the
output is straight binary and referenced to the ADC GND. The
displayed results should be in Volts format as opposed to Hex.
Figure 5. Input Configuration/Channel Selection
Figure 7. Reference Selection
Figure 6.BW Select
EVAL-AD76MUXEDZ