參數(shù)資料
型號(hào): ADS-B932
廠商: Electronic Theatre Controls, Inc.
元件分類(lèi): 串行ADC
英文描述: 16-Bit, 2MHz Sampling A/D Converters
中文描述: 16位,2MHz的采樣A / D轉(zhuǎn)換器
文件頁(yè)數(shù): 6/10頁(yè)
文件大?。?/td> 174K
代理商: ADS-B932
ADS-932
6
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 (T
A
= +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. FFT Analysis of ADS-932
Figure 3. ADS-932 Timing Diagram
This device has three pipeline delays. Four start convert pulses (clock cycles) must be applied for valid data
from the first conversion to appear at the output of the A/D.
The start convert positive pulse width must be between either 40 and 175nsec or 280 and 460nsec
(when sampling at 1MHz) to ensure proper operation. For sampling rates lower than 1MHz, the start pulse
can be wider than 460nsec, however a minimum pulse width low of 40nsec should be maintained. A 1MHz
clock with a 100nsec positive pulse width is used for all production testing.
START
CONVERT
INTERNAL S/H
N
N+1
Acquisition Time
225ns typ.
20ns typ.
EOC
75ns typ.
OUTPUT
DATA
Data N-4 Valid
Data N-2 Valid
Invalid
Data
Data N-3 Valid
20ns typ.
N+2
Data N-1 Valid
440ns typ.
60ns typ.
Invalid
Data
Notes:
100ns typ.
N+3
275ns typ.
45ns typ.
260ns typ.
Conversion Time
Hold
Scale is approximately 50ns per division. fs = 2MHz.
1.
2.
3.
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
–170
0
100
200
300
400
500
600
700
800
900
1000
Frequency (kHz)
(fs = 2MHz, fin = 975kHz, Vin = –0.5dB, 16,384-point FFT)
A
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