ADS-939 MURATA-PS [Murata Power Solutions Inc.], ADS-939 Datasheet - Page 5

• Manufacturer Part Number: ADS-939
• Description: 16-Bit, 10MHz Sampling A/D Converters
• Manufacturer: MURATA-PS [Murata Power Solutions Inc.]

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
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
–1/2 FS – 1/2LSB
–FS + 1/2 LSB
0 to –5.5V
0 –1 1/2 LSB
–FS +1 LSB
RANGE
0 – 1/8 FS
0 – 1/4 FS
0 –1 LSB
–1/2 LSB
INPUT
–3/4 FS
–7/8 FS
–FS
INTERNAL S/H
UNIPOLAR
–0.000084
–0.000126
–0.687500
–1.375000
–2.749958
–2.750000
–4.125000
–4.812500
–5.499916
–5.499958
–5.500000
CONVERT
SCALE
OUTPUT
START
DATA
EOC
1111 1111 1111 1111
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
0000 0000 0000 0000
MSB
COMP. BINARY
OFFSET BINARY
Scale is approximately 25ns per division. fs = 10MHz
LSB "1" to "0"
LSB "0" to "1"
N-8
65ns
N
60ns
20ns typ.
50ns
N-7
LSB
www.murata-ps.com
5ns typ.
10ns typ.
N+1
20ns typ.
MSB
0000 0000 0000 0000
0001 1111 1111 1111
0011 1111 1111 1111
0111 1111 1111 1111
1000 000
1011 1111 1111 1111
1101 1111 1111 1111
1111 1111 1111 1110
1111 1111 1111 1111
COMP. OFF. BIN.
Figure 3. ADS-939 Timing Diagram
N-6
40ns
LSB "0" to "1"
LSB "1" to "0"
A
BINARY
= +25°C)
N+2
Table 2b. Output Coding
000 0000
N-5
35ns
LSB
N+3
COMP. TWO'S COMP.
MSB
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.
0111 1111 1111 1111
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
1000 0000 0000 0000
N-4
TWO'S COMP.
N+4
LSB "1" to "0"
LSB "0" to "1"
N-3
LSB
N+5
16-Bit, 10MHz Sampling A/D Converters
Technical enquiries email: [e-mail], tel:
N-2
COMP. TWO'S COMP.
1000 0000 0000 0000
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
0111 1111 1111 1111
MSB
TWO'S COMP.
N+6
LSB "0" to "1"
LSB "1" to "0"
N-1
N+7
LSB
N
MDA_ADS-939.A01 Page 5 of 7
+2.749916
+2.749874
+2.062500
+1.375000
–0.000084
–1.375000
–2.062500
–2.749916
–2.749958
–2.750000
RANGE
±2.75V
INPUT
0.000000
N+8
ADS-939
+FS –1 1/2 LSB
–FS + 1/2 LSB
[phone]
BIPOLAR
+FS –1 LSB
–FS +1 LSB
SCALE
+3/4 FS
+1/2 FS
–1/2 FS
–3/4 FS
–1 LSB
–FS
0