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参数资料
| 型号： | AB-176 |
| 英文描述： | AB-176 - EXCHANGING FILES ON THE CUSTOMER SERVICE ELECTRONIC BULLETIN BOARD |
| 中文描述： | 抗体- 176 -交换了对客户服务电子公告板锉 |
| 文件页数： | 4/5页 |
| 文件大小： | 37K |
| 代理商： | AB-176 |
4
FIGURE 1. Digital Inversion of All Bits.
ADC
MSB
LSB
Inversion of all bits except the MSB
BOB to CTC and CTC to BOB
BTC to COB and COB to BTC
Manipulation of BOB into CTC and BTC into COB requires
inverting all bits except the MSB. This is also a difficult
transformation to accomplish, since it would require a digi-
tal inverter for every bit except the most significant bit (see
Figure 4).
n
= Number of bits in a particular digital system.
LSB
= Least Significant Bit — The digital bit with the least
analog “weight”.
MSB
= Most Significant Bit — The digital bit with the
greatest analog “weight”.
Increment
= To increase a digital “count”, or to count up, as in a
code changing from 0000 to 0001.
Decrement
= To decrease a digital “count”, or to count down, as
in a code changing from 0001 to 0000.
USB
= Unipolar Straight Binary coding.
CSB
= Complementary Straight Binary coding.
BOB
= Bipolar Offset Binary coding.
COB
= Complementary Offset Binary coding.
BTC
= Binary Two’s Complement coding.
CTC
= Complementary Two’s Complement coding.
FSR
= Full Scale Range — The dynamic range of an
analog signal.
BPZ
= Bipolar Zero — An analog voltage of 0V.
V
LSB
= Least Significant Bit Voltage — The value of voltage
represented by one LSB. For digital-to-analog
converters which provide a current output mode of
operation, V
LSB
actually refers to a voltage after a
current-to-voltage conversion. Throughout the text, it
is presumed that this current to voltage conversion
has taken place.
V
LSB
= FSR/2
n
(Equation 1)
DEFINITIONS
FIGURE 2. Analog Signal Inversion.
R
V
IN
R
V
O
–V
IN
=
R/2
Inversion of the MSB
BOB to BTC and BTC to BOB
COB to CTC and CTC to COB
Manipulating the BOB scheme into BTC and manipulating
COB into CTC requires much less hardware. To go from
BOB to BTC, or COB to CTC (or vice versa) it is only
necessary to invert the MSB (see Figure 3).
Burr-Brown’s PCM78, a 16-bit ADC developed for digital
audio applications allows BOB or BTC output schemes by
providing a “BOB/BTC select” input. Open circuit or ground-
ing of this pin provides for BTC and BOB respectively by
controlling an internal inverter for the most significant bit.
FIGURE 3. Inversion of the MSB.
ADC
MSB
LSB
FIGURE 4. Inversion of All Bits Except the MSB.
ADC
MSB
LSB
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