MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 425

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

13.9.1.1 Amplifier Bypass Mode Conversion Timing
MPC555
USER’S MANUAL
If the amplifier bypass mode is enabled for a conversion by setting the amplifier bypass
(BYP) bit in the CCW, the timing changes to that shown in
sample time is eliminated, reducing the potential conversion time by two QCLKs. How-
ever, due to internal RC effects, a minimum final sample time of four QCLKs must be
allowed. This results in no savings of QCLKs. When using the bypass mode, the ex-
ternal circuit should be of low source impedance, typically less than 10 kΩ. Also, the
loading effects of the external circuitry by the QADC64 need to be considered, since
the benefits of the sample amplifier are not present.
QCLK
/
MPC556 QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE-64
QCLK
Because of internal RC time constants, a sample time of two QCKLs
in bypass mode for high frequency operation is not recommended.
2 CYCLES
SAMPLE
BUFFER
TIME
SAMPLE TIME
Figure 13-6 Bypass Mode Conversion Timing
N CYCLES:
(2, 4, 8, 16)
SAMPLE
SAMPLE
TIME
TIME
FINAL SAMPLE
N CYCLES:
(2, 4, 8, 16)
TIME
Figure 13-5 Conversion Timing
SUCCESSIVE APPROXIMATION RESOLUTION
Rev. 15 October 2000
SUCCESSIVE APPROXIMATION RESOLUTION
RESOLUTION
NOTE
SEQUENCE
10 CYCLES
TIME
SEQUENCE
RESOLUTION
10 CYCLES
TIME
Figure
13-6. The buffered
MOTOROLA
13-13