MCF51QM32VFM(2012) View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MCF51QM32VFM
(Rev.:2012)

Embedded - Microcontrollers, Integrated Circuits (ICs)

Freescale Semiconductor 

Analog

Table 23. 16-bit ADC operating conditions (continued)

Symbol

Crate

Crate

Description

ADC conversion

rate

ADC conversion

rate

Conditions

≤ 13 bit modes

No ADC hardware

averaging

Continuous

conversions enabled,

subsequent conversion

time

16 bit modes

No ADC hardware

averaging

Continuous

conversions enabled,

subsequent conversion

time

Min.

20.000

37.037

Typ.1

Max.

Unit

—

818.330

Ksps

—

461.467

Ksps

Notes

5

5

1. Typical values assume VDDA = 3.0 V, Temp = 25°C, fADCK = 1.0 MHz unless otherwise stated. Typical values are for

reference only and are not tested in production.

2. DC potential difference.

3. This resistance is external to MCU. The analog source resistance should be kept as low as possible in order to achieve the

best results. The results in this datasheet were derived from a system which has <8 Ω analog source resistance. The RAS/

CAS time constant should be kept to <1ns.

4. To use the maximum ADC conversion clock frequency, the ADHSC bit should be set and the ADLPC bit should be clear.

5. For guidelines and examples of conversion rate calculation, download the ADC calculator tool: http://cache.freescale.com/

files/soft_dev_tools/software/app_software/converters/ADC_CALCULATOR_CNV.zip?fpsp=1

ZAS

RAS

SIMPLIFIED

INPUT PIN EQUIVALENT

CIRCUIT

Pad

leakage

due to

input

protection

ZADIN

SIMPLIFIED

CHANNEL SELECT

CIRCUIT

RADIN

ADC SAR

ENGINE

VADIN

VAS

CAS

INPUT PIN

INPUT PIN

INPUT PIN

RADIN

RADIN

RADIN

CADIN

Figure 9. ADC input impedance equivalency diagram

MCF51QM128 Data Sheet, Rev. 6, 01/2012.

38

Freescale Semiconductor, Inc.

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