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AD7293 Datasheet(PDF) 73 Page - Analog Devices

Part # AD7293
Description  12-Bit Power Amplifier Current Controller with ADC, DACs, and Temperature and Current Sensors
PDF  79 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7293 Datasheet(HTML) 73 Page - Analog Devices

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Data Sheet
AD7293
Rev. D | Page 73 of 79
1
8
16
24
WRITE TO ADC SEQUENCE REGISTER
24
32
40
48
56
1
8
16
READ FROM ADC DATA REGISTER
CONVERSION COMMAND
PREVIOUS CONVERSION RESULT
CONVERSION RESULT FOR V IN0 D15:D0
CONVERT
VIN0
16
1
8
16
1
8
16
CONVERSION RESULT FOR V IN1 D15:D0
CONVERSION RESULT FOR V IN2 D15:D0
CONVERT
VIN1
CONVERT
VIN2
DIN
SCLK
DOUT
BUSY
CS
DIN
SCLK
DOUT
BUSY
CS
DIN
SCLK
DOUT
BUSY
CS
Figure 55. Continuous Conversion Command Mode Example
1
8
16
24
1
8
16
24
0
X
0
0
0
0
0
1
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
X
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
8
16
24
1
8
16
24
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
1
X
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
X
X
X
X
1
8
16
24
1
8
16
24
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
1
X
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
X
X
X
X
PAGE SELECT POINTER
SEQUENCE PAGE
NO OP
ADC SEQUENCE
REGISTER WRITE
VIN3 VIN2 VIN1 VIN0 SELECTED
NO OP
NO OP
CONVERSION COMMAND
RESULT REGISTER READ
NO OP
NO OP
NO OP
NO OP
CONVERSION COMMAND
RESULT REGISTER READ
NO OP
NO OP
VIN0 RESULT
VIN1 RESULT
DIN
SCLK
CS
DIN
DOUT
SCLK
CS
DOUT
DIN
SCLK
CS
DOUT
Figure 56. Command Mode Read Example (24-Bit Fixed Frame, CS Taken High After Each Conversion)
Conversion Timing
Table 113 shows the approximate conversion times for each type
of channel under nominal conditions. Note that the temperature
and current sensor channels, when enabled, are background
conversions that are added on in command mode because the
integration/sense times are greater than other ADC reads.
Table 113. Typical Conversion Time
Channel
Command Mode
Background Mode (µs)
VINx
0.7 µs
2.3
ISENSEx
Not applicable
4.2
TSENSEx
Not applicable
2.3
Monitor
4.0 µs
4.0
Current Sense and Temperature Sense Channel
Integration Time
The internal current sense and temperature sense amplifiers
function by integrating the input voltage for a fixed amount of
time depending on the gain required. At the end of the integration
period, a request is sent to the ADC for a conversion to be
performed. The ADC deals with these requests in the order in
which they arrive.



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