AD7701 查看數據表（PDF） - Analog Devices

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AD7701

LC2MOS 16-Bit A/D Converter

Analog Devices 

AD7701

IOL

1.6mA

TO

OUTPUT

PIN CL

100pF

+2.1V

IOH

200µA

Figure 1. Load Circuit for Access

Time and Bus Relinquish Time

CAL

SC1, SC2

t1

t2

SC1, SC2 VALID

Figure 2a. Calibration Control Timing

CLKIN

t3

SLEEP

Figure 2b. SLEEP Mode Timing

DRDY

CS

SDATA

t10

HI-Z

DATA

VALID

Figure 3. SSC Mode Data

Hold Time

CS

SDATA

t15

HI-Z

DATA

VALID

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

t4

t6

HI-Z

DB15

t5

DB14

HI-Z

t5

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

DEFINITION OF TERMS

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.

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

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.

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.

Positive Full-Scale Overrange

Positive full-scale overrange is the amount of overhead available

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.

REV. E

–7–

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