ADS-939MM データシートの表示（PDF） - Murata Power Solutions
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ADS-939MM Datasheet PDF : 7 Pages
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ADS-939
16-Bit, 10MHz Sampling A/D Converters
Table 2b. Output Coding
COMP. BINARY
BINARY
COMP. TWO'S COMP. TWO'S COMP.
INPUT
RANGE UNIPOLAR
0 to –5.5V SCALE MSB
LSB
0 –1 LSB
0 –1 1/2 LSB
0 – 1/8 FS
0 – 1/4 FS
–1/2 FS – 1/2LSB
–1/2 LSB
–3/4 FS
–7/8 FS
–FS +1 LSB
–FS + 1/2 LSB
–FS
–0.000084
–0.000126
–0.687500
–1.375000
–2.749958
–2.750000
–4.125000
–4.812500
–5.499916
–5.499958
–5.500000
1111 1111 1111 1111
LSB "1" to "0"
1110 0000 0000 0000
1100 0000 0000 0000
1000 0000 0000 0000
0111 1111 1111 1111
0100 0000 0000 0000
0010 0000 0000 0000
0000 0000 0000 0001
LSB "0" to "1"
0000 0000 0000 0000
OFFSET BINARY
MSB
LSB
0000 0000 0000 0000
LSB "0" to "1"
0001 1111 1111 1111
0011 1111 1111 1111
0111 1111 1111 1111
1000 000 000 0000
1011 1111 1111 1111
1101 1111 1111 1111
1111 1111 1111 1110
LSB "1" to "0"
1111 1111 1111 1111
COMP. OFF. BIN.
MSB
LSB MSB
LSB
0111 1111 1111 1111
LSB "1" to "0"
0110 0000 0000 0000
0100 0000 0000 0000
0000 0000 0000 0000
1111 1111 1111 1111
1100 0000 0000 0000
1010 0000 0000 0000
1000 0000 0000 0001
LSB "0" to "1"
1000 0000 0000 0000
1000 0000 0000 0000
LSB "0" to "1"
1001 1111 1111 1111
1011 1111 1111 1111
1111 1111 1111 1111
0000 0000 0000 0000
0011 1111 1111 1111
0101 1111 1111 1111
0111 1111 1111 1110
LSB "1" to "0"
0111 1111 1111 1111
TWO'S COMP.
COMP. TWO'S COMP.
INPUT
RANGE
±2.75V
+2.749916
+2.749874
+2.062500
+1.375000
0.000000
–0.000084
–1.375000
–2.062500
–2.749916
–2.749958
–2.750000
BIPOLAR
SCALE
+FS –1 LSB
+FS –1 1/2 LSB
+3/4 FS
+1/2 FS
0
–1 LSB
–1/2 FS
–3/4 FS
–FS +1 LSB
–FS + 1/2 LSB
–FS
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.
Scale is approximately 25ns per division. fs = 10MHz
START
CONVERT
N
N+1
N+2 N+3 N+4 N+5
N+6 N+7
N+8
50ns
INTERNAL S/H
5ns typ.
65ns
35ns
EOC
10ns typ.
60ns
40ns
20ns typ.
OUTPUT
DATA
N-8
N-7
N-6
N-5
N-4
N-3
N-2
N-1
N
20ns typ.
Figure 3. ADS-939 Timing Diagram
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDA_ADS-939.A01 Page 5 of 7
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