P89LPC924 datasheet(18/49 Pages) PHILIPS

部件名	P89LPC924

功能描述	8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter

PDF	49 Pages

Scroll/Zoom	100%

制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

标志

18 / 49 page

Philips Semiconductors

P89LPC924/925

8-bit microcontrollers with accelerated two-clock 80C51 core

Product data

Rev. 03 — 15 December 2004

18 of 49

9397 750 14471

8.9 A/D converter

8.9.1

General description

The P89LPC924/925 has an 8-bit, 4-channel multiplexed successive approximation

analog-to-digital converter module. A block diagram of the A/D converter is shown in

Figure 5. The A/D consists of a 4-input multiplexer which feeds a sample-and-hold

circuit providing an input signal to one of two comparator inputs. The control logic in

combination with the successive approximation register (SAR) drives a

digital-to-analog converter which provides the other input to the comparator. The

output of the comparator is fed to the SAR.

Fig 5.

ADC block diagram.

–

COMP

DAC1

SAR

INPUT

MUX

CONTROL

LOGIC

CCLK

002aaa791

P89LPC924 数据表(PDF) 18 Page - NXP Semiconductors