EM19110 Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM19110

10-BIT 5 MSPS A/D CONVERTER 10-BIT 5 MSPS A/D CONVERTER

ELAN Microelectronics 

TIMING DIAGRAM

Clock

Analog input

Data output

EM19110

10-BIT 5 MSPS A/D CONVERTER

N

N+1

N+2

N+3

N-3

N-2

N-1

N

N+4

N+1

Application Note

1. AVDD ,DVDD ,VSS

To reduce noise effects, separate the analog and digital systems close to the device. For both the digital and

analog VDD pins, use a ceramic capacitor of about 0.1uF set as close as possible to the pin to bypass to the

respective GND’s.

2. Signal input Vi

Compared with the flash type A/D converter, the input capacitance of the analog input is rather small. However

it is necessary to conduct the drive with an amplifier featuring sufficient band and drive capability. When

driving with an amplifier of low output impedance, parasite oscillation may occur. That may be prevented by

inserting a resistance of about 100( in series between the amplifier output and A/D input.

3. Clock input

The clock line wiring should be as short as possible also, to avoid any interference with other signals, separate

it from other circuits.

4. Reference voltage

Voltage between VRT to VRB is compatible with the dynamic range of the analog input. Bypassing VRT and

VRB pins to GND, by means of a capacitor about 0.1uF, stable characteristics are obtained. By shorting VRT

and VRTS, VRB and VRBS, the self bias function that generates VRT=4.0V and VRB=1.0V, is activated.

Also, the users can setup external reference voltage by just connecting VRT and VRB to desired DC voltage

under spec.

5. Clock timing

* This specification are subject to be changed without notice.

5.26.1997 4

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