ADS-30639 Datel, Inc., ADS-30639 Datasheet - Page 4

• Manufacturer Part Number: ADS-30639
• Description: Dual, 14-bit, 6.4mhz Sampling A/D Converter
• Manufacturer: Datel, Inc.

THERMAL REQUIREMENTS
All DATEL sampling A/D converters are fully characterized and
specified over operating temperature (case) range of
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.
ADS-30639
–55 to +125°C. All room temperature (T
Tpwh
Tpwl
Tnctdv
Toetdv
Tseltdv
Tdctdv
Todtdz
Tctdv
rising edge
CONVERT
sample (n)
DATA ON
ENABLE
SELECT
taken on
Minimum convert pulse width high
Minimum convert pulse width low
New conversion to internal data valid (Internal)
Output enable to data valid
Select change to data valid
Internal data to data valid (Internal)
Output disable to high-impedence
Conversion to data valid
START
A & B
BUS
V
DD
= +5V, C
Tctdv
Tpwh
Channel
A Selected
A
L
= +25°C) production
=60pF
An-3
Original Specification
Figure 2. Timing Diagram
Channel
B Selected
Tpwl
Tseltdv
Bn-3
4
Tseltdv
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 AN8, "Heat Sinks for DIP Data Converters", or
contact DATEL directly, for additional information.
An-3
MSB
01 1111 1111 1111
01 1000 0000 0000
01 0000 0000 0000
00 0000 0000 0000
11 0000 0000 0000
10 1000 0000 0000
10 0000 0000 0001
10 0000 0000 0000
Channel
A Selected
Tctdv
TWO’S COMP
Min(ns)
Todtdz
An-2
45
45
20
20
30
16
8
8
Table 1. Output Coding
LSB
Max(ns)
INPUT VOLT.
Toetdv
+1.99976
+1.50000
+1.00000
–1.00000
–1.50000
–1.99976
–2.00000
20
40
40
18
45
38
0.00000
—
—
±2V
An-2
Typ(ns)
®
80
80
12
30
25
12
35
24
–FS+1LSB
+FS – 1LSB
BIPOLAR
–1/2FS
–3/4FS
+3/4FS
+1/2FS
SCALE
–FS
0
®