
28
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MAX19710
10-Bit, 7.5Msps, Full-Duplex
Analog Front-End
28
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The fastest method to perform sequential conversions
with the aux-ADC is by sending consecutive com-
mands setting AD10 = 1, AD0 = 1. With this sequence
the
CS/WAKE falling edge shifts data from the previous
conversion on to DOUT and the rising edge of
CS/WAKE loads the next conversion command at DIN.
Allow enough time for each conversion to complete
before sending the next conversion command. See
Figure 8 for single and continuous conversion examples.
Figure 8. Aux-ADC Conversions Timing
CS/WAKE
2. CONTINUOUS AUX-ADC CONVERSIONS
SCLK
00
01
1
11
1
00
1
11
1
00
1
11
16
1
10
11
12
13
14
15
16
1
10
11
12
13
14
15
16
1
DIN
DOUT
D1
D0
D0 HELD
D9
D1
D0
D0 HELD
D9
FIRST 10-BIT AUX-ADC
CONVERSION RESULT IS
SHIFTED OUT ON DOUT ON
THE FALLING EDGE OF SCLK
MSB FIRST
SECOND 10-BIT AUX-ADC
CONVERSION RESULT IS
SHIFTED OUT ON DOUT ON
THE FALLING EDGE OF SCLK
MSB FIRST
AD10 = 1, AD0 = 1,
PERFORM CONVERSION,
DOUT ENABLED
AD10 = 1, AD0 = 1,
PERFORM CONVERSION,
DOUT ENABLED
AD10 = 1, AD0 = 1,
PERFORM CONVERSION,
DOUT ENABLED
DOUT TRANSITIONS FROM
HIGH IMPEDANCE TO LOGIC-
HIGH INDICATING START OF
FIRST CONVERSION
DOUT TRANSITIONS HIGH
INDICATING START OF
SECOND CONVERSION
DOUT TRANSITIONS HIGH
INDICATING START OF
THIRD CONVERSION
DOUT TRANSITIONS LOW
INDICATING END OF FIRST
CONVERSION, DATA IS AVAILABLE
AND CAN BE SHIFTED OUT IF DOUT
IS ENABLED, AD0 CLEARED
DOUT TRANSITIONS LOW
INDICATING END OF SECOND
CONVERSION, DATA IS AVAILABLE
AND CAN BE SHIFTED OUT IF DOUT
IS ENABLED, AD0 CLEARED
DOUT TRANSITIONS LOW
INDICATING END OF THIRD
CONVERSION, DATA IS AVAILABLE
AND CAN BE SHIFTED OUT IF DOUT
IS ENABLED, AD0 CLEARED
AUX-ADC REGISTER
ADDRESS
tCSD
tCD
tCHZ
CS/WAKE
SCLK
1. SINGLE AUX-ADC CONVERSION WITH CONVERSION DATA READOUT AT A LATER TIME
1
00
1
0
1
0
1
DIN SET HIGH DURING SINGLE READ
11
16
1
16
1
16
1
16
10
D1
D0
D0 HELD
D9
11
DIN
DOUT
AD10 = 0, AD0 = 1,
PERFORM CONVERSION,
DOUT DISABLED
DOUT TRANSITIONS FROM
HIGH IMPEDANCE TO LOGIC-
HIGH INDICATING START OF
CONVERSION
DOUT TRANSITIONS LOW
INDICATING END OF CONVERSION,
DATA IS AVAILABLE AND CAN BE
SHIFTED OUT IF DOUT IS ENABLED,
AD0 CLEARED
0
IF AUX-ADC CONVERSION
DOES NOT NEED TO BE
READ IMMEDIATELY, THE SPI
INTERFACE IS FREE AND
CAN BE USED FOR OTHER
FUNCTIONS, SUCH AS
HOUSEKEEPING AUX-DAC
ADJUSTMENT, ETC.
AUX-ADC REGISTER
ADDRESS
CONVERSION RESULT DATA
BIT D0 IS HELD FOR THE SIX
LEAST SIGNIFICANT BITS
DOUT TRANSITIONS TO
HIGH IMPEDANCE
10-BIT AUX-ADC
CONVERSION RESULT IS
SHIFTED OUT ON DOUT ON
THE FALLING EDGE OF SCLK
MSB FIRST
AUX-ADC REGISTER
ADDRESS
AD10 = 1, AD0 = 0,
AUX-ADC IDLE
(NO CONVERSION),
DOUT ENABLED AND
CONVERSION DATA IS
SHIFTED OUT ON NEXT
CS/WAKE FALLING EDGE
FIRST FALLING EDGE OF
CS/WAKE AFTER DOUT IS
ENABLED STARTS SHIFTING THE
AUX-ADC CONVERSION DATA ON
THE FALLING EDGE OF SCLK
tDCS
tCONV