AN7820 Просмотр технического описания (PDF) - Fairchild Semiconductor

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AN7820

EVALUATION BOARD

Fairchild Semiconductor 

Figure 15: Three-Bit Reconstruction DAC Waveform Using Analog Input Ramp

Ramp Input

contain n conversions

Last 3-LSB codes

111

110

101

(B)

100

011

Theoretical

010

Actual

001

(A)

Missing Code

000

(MC)

LSB

Non- Monotonic DLE ≈ -1/2 LSB

(A) is the actual bit weight for the output code multiple of 011

(B) is the major transition noise. This noise level shown is greater than ± 1/2 LSB

Advantages:

Disadvantages:

1) Many tests (as stated above) can be extracted from this 1) The accuracy depends on human judgement and can be

one, simple test set-up.

very difficult if the person is not familiar with it.

2) The missing code and the transition noise can be more

accurately identified than with any other standard test

methods.

3) Set-up is quick and relatively accurate.

2) The exact code is not shown in the transfer curve, but in

a multiple of the last three bits of the LSB. To overcome

this problem, probe every bit using an oscilloscope or

install LEDs at each output (P3 connector) to signal the

state of each output bit.

AN7820/24

11

5/22/97

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