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參數資料
| 型號： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊模擬到數字轉換器參考手冊 |
| 文件頁數： | 45/122頁 |
| 文件大小： | 940K |
| 代理商： | QADCRM |
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QADC
REFERENCE MANUAL
ANALOG SUBSYSTEM
MOTOROLA
6-3
ple time of four QCLKs must be allowed. This results in a savings of four QCLKs.
When using the bypass mode, the external circuit should be of low source impedance
(typically less than 10 k
). Also, the loading effects of the external circuitry by the
QADC need to be considered, since the benefits of the sample amplifier are not
present.
Figure 6-3 Bypass Mode Conversion Timing
6.2 Front-End Analog Multiplexer
The internal multiplexer selects one of the 16 analog input pins or one of three special
internal reference channels for conversion. The following are the three special chan-
nels:
V
RH
— Reference Voltage High
V
RL
— Reference Voltage Low
V
DDA
/2 — Mid-Analog Supply Voltage
The selected input is connected to one side of the DAC capacitor array. The other side
of the DAC array is connected to the comparator input. The multiplexer also includes
positive and negative stress protection circuitry, which prevents other channels from
affecting the current conversion when voltage levels are applied to the other channels.
Refer to
APPENDIX A ELECTRICAL CHARACTERISTICS
for specific voltage level
limits.
6.3 Digital to Analog Converter Array
The digital to analog converter (DAC) array consists of binary-weighted capacitors and
a resistor-divider chain. The array serves two purposes:
The array holds the sampled input voltage during conversion.
The resistor-capacitor array provides the mechanism for the successive approx-
imation A/D conversion.
Resolution begins with the most significant bit (MSB) and works down to the least
significant bit (LSB). The switching sequence is controlled by the digital logic.
SAMPLE
TIME
N CYCLES:
(2, 4, 8, 16)
RESOLUTION
TIME
10 CYCLES
SAMPLE
TIME
SUCCESSIVE APPROXIMATION RESOLUTION
SEQUENCE
QCLK
QADC BYP CONVERSION TIM
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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