ADS-929SLASH883 datasheet(5/8 Pages) ETC

5 / 8 page

ADS-929

THERMAL REQUIREMENTS

All DATEL sampling A/D converters are fully characterized and

specified over operating temperature (case) ranges of

0 to +70°C and –55 to +125°C. All room-temperature

(TA = +25°C) production testing is performed without the use of

heat sinks or forced-air cooling. Thermal impedance figures for

each device are listed in their respective specification tables.

These devices do not normally require heat sinks, however,

standard precautionary design and layout procedures should

be used to ensure devices do not overheat. The ground and

power planes beneath the package, as well as all pcb signal

runs to and from the device, should be as heavy as possible to

help conduct heat away from the package.

Electrically-insulating, thermally-conductive "pads" may be

installed underneath the package. Devices should be soldered

to boards rather than "socketed", and of course, minimal air

flow over the surface can greatly help reduce the package

temperature.

In more severe ambient conditions, the package/junction

temperature of a given device can be reduced dramatically

(typically 35%) by using one of DATEL's HS Series heat sinks.

See Ordering Information for the assigned part number. See

page 1-183 of the DATEL Data Acquisition Components

Catalog for more information on the HS Series. Request

DATEL Application Note AN-8, "Heat Sinks for DIP Data

Converters", or contact DATEL directly, for additional

information.

Figure 4. ADS-929 Timing Diagram

START

CONVERT

OUTPUT

DATA

N + 1

Data (N – 1) Valid

200ns

typ.

INTERNAL S/H

Acquisition Time

10ns typ.

Data N Valid

EOC

30ns typ.

Conversion Time

75ns max.

70ns ±10ns

35ns max.

425ns min.

Invalid

Data

360ns ±20ns

Hold

190ns

±40ns

310ns typ.

Notes: 1. fs = 2MHz.

2. The ADS-929 is an edge-triggered device. All internal operations

are triggered by the rising edge of the start convert pulse, which

may be as narrow as 20nsec. All production testing is performed

at a 2MHz sampling rate with 200nsec wide start pulses. For

lower sampling rates, wider start pulses may be used, however, a

minimum pulse width low of 20nsec must be maintained.

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