AD7701(RevD) 데이터 시트보기 (PDF) - Analog Devices
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AD7701 Datasheet PDF : 16 Pages
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AD7701
IOL
1.6mA
TO
OUTPUT
PIN CL
100pF
+2.1V
I OH
200µA
Figure 1. Load Circuit for Access
Time and Bus Relinquish Time
CS
SDATA
t10
HI-Z
DATA
VALID
Figure 3. SSC Mode Data Hold
Time
CAL
SC1, SC2
t1
t2
SC1,SC2 VALID
CLKIN
t3
SLEEP
Figure 2a. Calibration Control Timing
Figure 2b. SLEEP Mode Timing
DRDY
CS
SDATA
t15
DATA
VALID
HI-Z
CS
SCLK
t12
t11
t13
HI-Z
SDATA
t14
DB15 DB14
t16
HI-Z
DB1 DB0
Figure 4a. SEC Mode Data Hold Time Figure 4b. SEC Mode Timing Diagram
CLKIN
CS
SCLK
SDATA
t7
t8
HI-Z
t4
t6
HI-Z
DB15
t5
DB14
t9
DB1
HI-Z
DB0
Figure 5. SSC Mode Timing Diagram
DRDY
CS
t17
SCLK
HI-Z
SDATA
t18
START
DB8
DB9
HIGH BYTE
t19
DB7 STOP 1 STOP 2
LOW BYTE
HI-Z
Figure 6. AC Mode Timing Diagram
TERMINOLOGY
LINEARITY ERROR
This is the maximum deviation of any code from a straight line
passing through the endpoints of the transfer function. The
endpoints of the transfer function are Zero-Scale (not to be
confused with Bipolar Zero), a point 0.5 LSB below the first
code transition (000 . . . 000 to 000 . . . 001) and Full-Scale, a
point 1.5 LSB above the last code transition (111 . . . 110 to
111 . . . 111). The error is expressed as a percentage of full
scale.
BIPOLAR ZERO ERROR
This is the deviation of the midscale transition (0111 . . . 111 to
1000 . . . 000) from the ideal (AGND – 0.5 LSB) when
operating in the bipolar mode. It is expressed in microvolts.
BIPOLAR NEGATIVE FULL-SCALE ERROR
This is the deviation of the first code transition from the ideal
(–VREF + 0.5 LSB), when operating in the bipolar mode. It is
expressed in microvolts.
DIFFERENTIAL LINEARITY ERROR
This is the difference between any code’s actual width and the
ideal (1 LSB) width. Differential Linearity Error is expressed in
LSBs. A differential linearity specification of ± 1 LSB or less
guarantees monotonicity.
POSITIVE FULL-SCALE ERROR
Positive Full-Scale Error is the deviation of the last code
transition (111 . . . 110 to 111 . . . 111) from the ideal (VREF
–3/2 LSBs). It applies to both positive and negative analog input
ranges and it is expressed in microvolts.
UNIPOLAR OFFSET ERROR
Unipolar Offset Error is the deviation of the first code transition
from the ideal (AGND + 0.5 LSB) when operating in the uni-
polar mode. It is expressed in microvolts.
POSITIVE FULL-SCALE OVERRANGE
Positive Full-Scale Overrange is the amount of overhead avail-
able to handle input voltages greater than +VREF ( for example,
noise peaks or excess voltages due to system gain errors in
system calibration routines) without introducing errors due to
overloading the analog modulator or overflowing the digital
filter. It is expressed in millivolts.
NEGATIVE FULL-SCALE OVERRANGE
This is the amount of overhead available to handle voltages
below –VREF without overloading the analog modulator or
overflowing the digital filter. Note that the analog input will
accept negative voltage peaks even in the unipolar mode. The
overhead is expressed in millivolts.
–6–
REV. D
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