P89LPC925 PHILIPS [NXP Semiconductors], P89LPC925 Datasheet - Page 18

• Manufacturer Part Number: P89LPC925
• Description: 8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9397 750 14471
Product data
8.9.1 General description
8.9 A/D converter
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
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.
5. The A/D consists of a 4-input multiplexer which feeds a sample-and-hold
INPUT
MUX
Rev. 03 — 15 December 2004
8-bit microcontrollers with accelerated two-clock 80C51 core
COMP
+
–
DAC1
P89LPC924/925
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
CCLK
SAR
8
CONTROL
LOGIC
002aaa791
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