ADUC812 datasheet(8/60 Pages) AD

Numer części	ADUC812

Szczegółowy opis	MicroConverter짰, Multichannel 12-Bit ADC with Embedded Flash MCU

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Producent	AD [Analog Devices]

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REV. E

ADuC812

–8–

Mnemonic

Type

Function

PSEN

OProgram Store Enable, Logic Output. This output is a control signal that enables the external program

memory to the bus during external fetch operations. It is active every six oscillator periods except during

external data memory accesses. This pin remains high during internal program execution.

PSEN can also be

used to enable serial download mode when pulled low through a resistor on power-up or RESET.

ALE

O

Address Latch Enable, Logic Output. This output is used to latch the low byte (and page byte for 24-bit

address space accesses) of the address into external memory during normal operation. It is activated every

six oscillator periods except during an external data memory access.

EA

IExternal Access Enable, Logic Input. When held high, this input enables the device to fetch code from

internal program memory locations 0000H to 1FFFH. When held low, this input enables the device to fetch

all instructions from external program memory.

P0.7–P0.0

I/O

Port 0 is an 8-bit open-drain bidirectional I/O port. Port 0 pins that have 1s written to them float and in

(A0–A7)

that state can be used as high impedance inputs. Port 0 is also the multiplexed low order address and data

bus during accesses to external program or data memory. In this application, it uses strong internal pull-ups

when emitting 1s.

TERMINOLOGY

ADC SPECIFICATIONS

Integral Nonlinearity

This is the maximum deviation of any code from a straight line

passing through the endpoints of the ADC transfer function.

The endpoints of the transfer function are zero scale, a point

1/2 LSB below the first code transition, and full scale, a point

1/2 LSB above the last code transition.

Differential Nonlinearity

This is the difference between the measured and the ideal 1 LSB

change between any two adjacent codes in the ADC.

Offset Error

This is the deviation of the first code transition (0000 . . . 000)

to (0000 ... 001) from the ideal, i.e., +1/2 LSB.

Full-Scale Error

This is the deviation of the last code transition from the ideal

AIN voltage (Full Scale – 1.5 LSB) after the offset error has

been adjusted out.

Signal-to-(Noise + Distortion) Ratio

This is the measured ratio of signal-to-(noise + distortion) at the

output of the ADC. The signal is the rms amplitude of the fun-

damental. Noise is the rms sum of all nonfundamental signals up

to half the sampling frequency (fS/2), excluding dc. The ratio is

dependent upon the number of quantization levels in the digiti-

zation process; the more levels, the smaller the quantization

noise. The theoretical signal-to-(noise + distortion) ratio for an

ideal N-bit converter with a sine wave input is given by:

Signal-to-(Noise + Distortion) = (6.02N + 1.76) dB

Thus for a 12-bit converter, this is 74 dB.

Total Harmonic Distortion

Total Harmonic Distortion is the ratio of the rms sum of the

harmonics to the fundamental.

DAC SPECIFICATIONS

Relative Accuracy

Relative accuracy or endpoint linearity is a measure of the

maximum deviation from a straight line passing through the

endpoints of the DAC transfer function. It is measured after

adjusting for zero-scale error and full-scale error.

Voltage Output Settling Time

This is the amount of time it takes for the output to settle to a

specified level for a full-scale input change.

Digital-to-Analog Glitch Impulse

This is the amount of charge injected into the analog output

when the inputs change state. It is specified as the area of the

glitch in nV sec.

PIN FUNCTION DESCRIPTIONS (continued)

Podobny numer części - ADUC812

Producent	Numer części	Arkusz danych	Szczegółowy opis
Analog Devices	ADUC812	543Kb / 31P	MicroConverter?? Multichannel 12-Bit ADC with Embedded FLASH MCU REV. 0
	ADUC812BS	543Kb / 31P	MicroConverter?? Multichannel 12-Bit ADC with Embedded FLASH MCU REV. 0
	ADUC812BSZ	1Mb / 57P	MicroConverter, Multichannel 12-Bit ADC with Embedded Flash MCU REV. F
	ADUC812BSZ-REEL	1Mb / 57P	MicroConverter, Multichannel 12-Bit ADC with Embedded Flash MCU REV. F
	ADUC812	1Mb / 57P	MicroConverter, Multichannel 12-Bit ADC with Embedded Flash MCU Rev. F

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Podobny opis - ADUC812

Producent	Numer części	Arkusz danych	Szczegółowy opis
Analog Devices	ADUC814BRUZ	852Kb / 72P	MicroConverter짰, Small Package 12-Bit ADC with Embedded Flash MCU REV. A
	ADUC814ARUZ	852Kb / 72P	MicroConverter짰, Small Package 12-Bit ADC with Embedded Flash MCU REV. A
	ADUC812	1Mb / 57P	MicroConverter, Multichannel 12-Bit ADC with Embedded Flash MCU Rev. F
	ADUC812	543Kb / 31P	MicroConverter?? Multichannel 12-Bit ADC with Embedded FLASH MCU REV. 0
	ADUC812BSZ	1Mb / 57P	MicroConverter, Multichannel 12-Bit ADC with Embedded Flash MCU REV. F
	ADUC832BSZ	48Kb / 3P	MicroConverter짰, Multi-Channel 12-bit ADCs and DACs with Embedded FLASH MCU REV. B.1 November/2002
	EVAL-ADUC831QSZ	1Mb / 76P	MicroConverter짰, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU REV. 0
	ADUC845	1Mb / 109P	MicroConverter짰 Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU Rev. D
	ADUC845	1Mb / 108P	MicroConverter짰 Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU REV. C
	ADUC814	846Kb / 72P	MicroConverter, Small Package 12-Bit ADC with Embedded Flash MCU REV. A

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