AD7610BCPZ1 AD [Analog Devices], AD7610BCPZ1 Datasheet - Page 29

• Manufacturer Part Number: AD7610BCPZ1
• Description: 16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
• Manufacturer: AD [Analog Devices]

MICROPROCESSOR INTERFACING
The AD7610 is ideally suited for traditional dc measurement appli-
cations supporting a microprocessor, and ac signal processing
applications interfacing to a digital signal processor. The AD7610 is
designed to interface with a parallel 8-bit or 16-bit wide inter-
face, or with a general-purpose serial port or I/O ports on a micro-
controller. A variety of external buffers can be used with the
AD7610 to prevent digital noise from coupling into the ADC.
SPI Interface
The AD7610 is compatible with SPI and QSPI digital hosts
and DSPs such as Blackfin® ADSP-BF53x and ADSP-218x/
ADSP-219x. Figure 46 shows an interface diagram between the
AD7610 and the SPI-equipped ADSP-219x. To accommodate
the slower speed of the DSP, the AD7610 acts as a slave device, and
data must be read after conversion. This mode also allows the
daisy-chain feature. The convert command could be initiated
in response to an internal timer interrupt.
CNVST
SCCLK
BUSY
SCCS
SCIN
WARP = 0 OR 1
IMPULSE = 0 OR 1
X
t
t
33
31
t
31
START
1
BIP = 0 OR 1
TEN = 0 OR 1
t
34
BIPOLAR
2
HW/SW = 0
SER/PAR = 1
3
TEN
Figure 45. Serial Configuration Port Timing
4
t
PD
35
t
PD = 0
INVSCLK = 0
37
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t
5
36
X
6
X
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 peripheral interface (SPI) on the ADSP-219x
is configured for master mode (MSTR) = 1, clock polarity bit
(CPOL) = 0, clock phase bit (CPHA) = 1, and SPI interrupt enable
(TIMOD) = 0 by writing to the SPI control register (SPICLTx).
It should be noted that to meet all timing requirements, the SPI
clock should be limited to 17 Mbps allowing it to read an ADC
result in less than 1 μs. When a higher sampling rate is desired,
use one of the parallel interface modes.
OB/2C
7
DVDD
8
*ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 46. Interfacing the AD7610 to SPI Interface
SER/PAR
EXT/INT
RD
INVSCLK
9
AD7610*
SDOUT
CNVST
BUSY
SCLK
t
CS
8
X
PFx
SPIxSEL (PFx)
MISOx
SCKx
PFx OR TFSx
ADSP-219x*
AD7610