LPC2921 datasheet(70/83 Pages) NXP

70 / 83 page

LPC2921_23_25_1

Preliminary data sheet

Rev. 01 — 15 June 2009

70 of 83

NXP Semiconductors

LPC2921/2923/2925

ARM9 microcontroller with CAN, LIN, and USB

9.6 Dynamic characteristics: ADC1/2

[1]

All parameters are guaranteed over the virtual junction temperature range by design. Pre-testing is performed at Tamb =85 °C ambient

temperature on wafer level. Cased products are tested at Tamb =25 °C (ﬁnal testing). Both pre-testing and ﬁnal testing use correlated

test conditions to cover the speciﬁed temperature and power supply voltage range.

[2]

Duty cycle clock should be as close as possible to 50 %.

10. Application information

10.1 Operating frequency selection

The LPC2921/2923/2925 is speciﬁed to operate at a maximum frequency of 125 MHz,

maximum temperature of 85

°C, and maximum core voltage of 1.89 V. Figure 25 and

Figure 26 show that the user can achieve higher operating frequencies for the

LPC2921/2923/2925 by controlling the temperature and the core voltage accordingly.

Table 39.

ADC dynamic characteristics

VDD(CORE) =VDD(OSC_PLL); VDD(IO) = 2.7 V to 3.6 V; VDDA(ADC3V3) = 3.0 V to 3.6 V; all voltages are measured with respect to

ground.[1]

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fi(ADC)

ADC input frequency

[2] 4

4.5

MHz

fs(max)

maximum sampling rate

fi(ADC) = 4.5 MHz;

fs =fi(ADC)/(n + 1) with

n = resolution

resolution 2 bit

1500

ksample/s

resolution 10 bit

400

ksample/s

tconv

conversion time

In number of ADC

clock cycles

cycles

In number of bits

bits

Fig 25. Core operating frequency versus temperature for different core voltages

temperature (

°C)

002aae194

125

115

135

145

core

frequency

(MHz)

105

VDD(CORE) = 1.95 V

VDD(CORE) = 1.8 V

VDD(CORE) = 1.65 V

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