EVAL-AD7679CB Analog Devices Inc, EVAL-AD7679CB Datasheet - Page 21

• Manufacturer Part Number: EVAL-AD7679CB
• Description: BOARD EVAL FOR AD7679
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7679CB

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 570k
• Data Interface: Serial, Parallel
• Inputs Per Adc: 1 Differential
• Input Range: ±VREF
• Power (typ) @ Conditions: 89mW @ 500kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7679
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MASTER SERIAL INTERFACE
Internal Clock
The AD7679 is configured to generate and provide the serial
data clock SCLK when the EXT/ INT pin is held low. The
AD7679 also generates a SYNC signal to indicate to the host
when the serial data is valid. The serial clock SCLK and the
SYNC signal can be inverted if desired. Depending on the
RDC/SDIN input, the data can be read after each conversion or
during the following conversion.
the detailed timing diagrams of these two modes.
Usually, because the AD7679 is used with a fast throughput, the
mode master read during conversion is the most recommended
serial mode.
SDOUT
CS, RD
CNVST
BUSY
SYNC
SCLK
t
Figure 38
3
t
t
15
16
t
14
t
29
Figure 38. Master Serial Data Timing for Reading (Read after Convert)
and
EXT/INT = 0
Figure 39
X
t
22
t
20
D17
show
1
t
t
19
18
Rev. A | Page 21 of 28
RDC/SDIN = 0
D16
t
t
21
2
23
t
28
3
In Read during Conversion mode, the serial clock and data
toggle at appropriate instants, minimizing potential
feedthrough between digital activity and critical conversion
decisions.
In Read after Conversion mode, it should be noted that unlike
in other modes, the BUSY signal returns low after the 18 data
bits are pulsed out and not at the end of the conversion phase,
which results in a longer BUSY width.
To accommodate slow digital hosts, the serial clock can be
slowed down by using DIVSCLK.
INVSCLK = INVSYNC = 0
16
D2
17
D1
t
24
t
18
30
D0
03085-0-040
t
t
t
26
27
25
AD7679