EVAL-AD7651CBZ Analog Devices Inc, EVAL-AD7651CBZ Datasheet - Page 24

• Manufacturer Part Number: EVAL-AD7651CBZ
• Description: BOARD EVALUATION FOR AD7651
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7651CBZ

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 100k
• Data Interface: Serial, Parallel
• Inputs Per Adc: 1 Differential
• Input Range: 0 ~ 2.5 V
• Power (typ) @ Conditions: 16mW @ 100kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7651
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7651
MICROPROCESSOR INTERFACING
The AD7651 is ideally suited for traditional dc measurement
applications supporting a microprocessor, and for ac signal
processing applications interfacing to a digital signal processor.
The AD7651 is designed to interface either with a parallel 8-bit
or 16-bit wide interface, or with a general-purpose serial port or
I/O ports on a microcontroller. A variety of external buffers can
be used with the AD7651 to prevent digital noise from coupling
into the ADC. The following section discusses the use of an
AD7651 with an ADSP-219x SPI equipped DSP.
SPI Interface (ADSP-219x)
Figure 37
the SPI equipped ADSP-219x. To accommodate the slower
speed of the DSP, the AD7651 acts as a slave device and data
must be read after conversion. This mode also allows the daisy-
chain feature. The convert command can be initiated in
response to an internal timer interrupt. The reading process can
be initiated in response to the end-of-conversion signal (BUSY
going LOW) using an interrupt line of the DSP. The serial inter-
face (SPI) on the ADSP-219x is configured for master mode—
shows an interface diagram between the AD7651 and
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(MSTR) = 1, Clock Polarity bit (CPOL) = 0, Clock Phase bit
(CPHA) = 1, and SPI Interrupt Enable (TIMOD) = 00—by
writing to the SPI control register (SPICLTx). To meet all timing
requirements, the SPI clock should be limited to 17 Mbps, which
allows it to read an ADC result in less than 1 µs. When a higher
sampling rate is desired, use of one of the parallel interface
modes is recommended.
DVDD
SER/PAR
EXT/INT
RD
INVSCLK
Figure 37. Interfacing the AD7651 to an SPI Interfac
AD7651*
* ADDITIONAL PINS OMITTED FOR CLARITY
SDOUT
CNVST
BUSY
SCLK
CS
PFx
SPIxSEL (PFx)
MISOx
SCKx
PFx or TFSx
ADSP-219x*
02964-0-021