ADS-935 MURATA-PS [Murata Power Solutions Inc.], ADS-935 Datasheet - Page 6

• Manufacturer Part Number: ADS-935
• Description: 16-Bit, 5MHz 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
www.cd4power.com
–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
CONVERT
–0.000084
–0.000126
–0.687500
–1.375000
–2.749958
–2.750000
–4.125000
–4.812500
–5.499916
–5.499958
–5.500000
OUTPUT
SCALE
START
DATA
NOTES:
1. Scale is approximately 20ns per didsion.fs = 5MHz
2. This device has three pipeline delays. Four start convert pulses (clock cycles) must be applied for valid data from the
EOC
first conversion to appear at the output of the A/D.
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
LSB "1" to "0"
LSB "0" to "1"
Data N-4 Valid
50ns typ.
N
Hold
LSB
o d
20ns typ.
0 s y
0
0
0
1
0
0
1
0
50ns typ.
MSB
0 s y
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-935 Timing Diagram
LSB "0" to "1"
LSB "1" to "0"
BINARY
A
A
Data N-3 Valid
= +25°C)
Table 2b. Output Coding
N+1
000 0000
Conversion Time
20ns typ.
125ns typ.
LSB
o v r o T m
0 s y .
110ns typ.
0
0
Acquisition Time
A q s
COMP . TWO'S COMP .
p
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 111
1100 0000 0000 0000
1010 0000 0000 0000
1000 0000 0000 0001
1000 0000 0000 0000
Invalid
TWO'S COMP .
Data
p
75ns typ.
5 s y
LSB "1" to "0"
LSB "0" to "1"
N+2
Data N-2 Valid
150ns typ.
1 0 s y
e
20ns typ.
2 n t p
LSB
1
0
0
0
1
0
0
1
0
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
Invalid
TWO'S COMP .
Data
LSB "0" to "1"
LSB "1" to "0"
Data N-1 Valid
N+3
LSB
+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
+FS –1 1/2 LSB
–FS + 1/2 LSB
BIPOLAR
+FS –1 LSB
–FS +1 LSB
Page 6 of 8
SCALE
+3/4 FS
+1/2 FS
–1/2 FS
–3/4 FS
–1 LSB
–FS
0