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PDF ADS-939 Data sheet ( Hoja de datos )
| Número de pieza | ADS-939 | |
| Descripción | A/D Converters | |
| Fabricantes | Murata | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADS-939 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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ADS-939
16-Bit, 10MHz Sampling A/D Converters
PRELIMINARY DATA
FEATURES
N 16-bit resolution
N 10MHz sampling rate
N Functionally complete
N No missing codes over full military temperature range
N Edge-triggered
N ±5V, ±12V or ±15V supplies, 1.5 Watts
N Small, 40-pin, ceramic TDIP
N 82dB SNR, –86dB THD
N Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The ADS-939 is a 16-bit, 10MHz sampling A/D converter. This device
accurately samples full-scale input signals up to Nyquist frequencies with
no missing codes. The dynamic performance of the ADS-939 has been
optimized to achieve a signal-to-noise ratio (SNR) of 82dB and a total
harmonic distortion (THD) of –86dB.
Packaged in a 40-pin TDIP, the functionally complete ADS-939 contains a
fast-settling sample-hold amplifier, a subranging (two-pass) A/D converter,
an internal reference, timing/control logic, and error-correction circuitry.
Digital input and output levels are TTL. The ADS-939 only requires the
rising edge of the start convert pulse to operate.
Requiring ±5V supplies and either ±12v or ±15V supplies the ADS-939
dissipates 3.0 Watts. The device is offered with a bipolar (±2.75V) or a
unipolar (0 to –5.5V) analog input range. Models are available for use
in either commercial (0 to +70°C) or military (–55 to +125°C) operating
temperature ranges. A proprietary, auto-calibrating, error-correcting circuit
enables the device to achieve specified performance over the full military
temperature range. Typical applications include medical imaging, radar,
sonar, communications and instrumentation.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
1 +3.2V REF. OUT
2 UNIPOLAR
3 ANALOG INPUT
4 ANALOG GROUND
5 OFFSET ADJUST
6 GAIN ADJUST
7 DIGITAL GROUND
8 NC
9 NC
10 NC
11 NC
12 START CONVERT
13 BIT 16 (LSB)
14 BIT 15
15 BIT 14
16 BIT 13
17 BIT 12
18 BIT 11
19 BIT 10
20 BIT 9
PIN FUNCTION
40 +12V/+15V
39 –12V/–15V
38 +5V ANALOG SUPPLY
37 –5V SUPPLY
36 ANALOG GROUND
35 COMP. BITS
34 OUTPUT ENABLE
33 OVERFLOW
32 EOC
31 +5V DIGITAL SUPPLY
30 DIGITAL GROUND
29 BIT 1 (MSB)
28 BIT 1 (MSB)
27 BIT 2
26 BIT 3
25 BIT 4
24 BIT 5
23 BIT 6
22 BIT 7
21 BIT 8
POWER AND GROUNDING
+5V ANALOG SUPPLY
+5V DIGITAL SUPPLY
–5V SUPPLY
ANALOG GROUND
DIGITAL GROUND
–12/–15V ANALOG SUPPLY
+12/+15V ANALOG SUPPLY
38
31
37
4, 36
7, 30
39
40
For full details go to
www.murata-ps.com/rohs
GAIN ADJUST 6
GAIN
ADJUST
CKT.
POWER AND GROUNDING
+5V ANALOG SUPPLY 38
+5V DIGITAL SUPPLY 31
–5V SUPPLY
37
ANALOG GROUND 2, 4, 36
DIGITAL GROUND
7, 30
NO CONNECTION 39, 40
+3.2V REF. OUT 1
OFFSET ADJUST 5
UNIPOLAR 2
ANALOG INPUT 3
PRECISION
+3.2V REFERENCE
OFFSET
ADJUST
CKT.
S/H
START CONVERT 12
EOC 32
COMP. BITS 35
TIMING AND
CONTROL LOGIC
Figure 1. ADS-939 Functional Block Diagram
10 FSTAT1
11 FSTAT2
8 FIFO/DIR
9 FIFO/READ
29 BIT 1 (MSB)
28 BIT 1 (MSB)
27 BIT 2
26 BIT 3
25 BIT 4
24 BIT 5
23 BIT 6
22 BIT 7
21 BIT 8
20 BIT 9
19 BIT 10
18 BIT 11
17 BIT 12
16 BIT 13
15 BIT 14
14 BIT 15
13 BIT 16 (LSB)
34 OUTPUT ENABLE
33 OVERFLOW
www.murata-ps.com
MDA_ADS-939.A01 Page 1 of 7
Free Datasheet http://www.datasheet4u.com/
1 page  
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
50ns
N+2 N+3 N+4 N+5
N+6 N+7
N+8
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
20ns typ.
Figure 3. ADS-939 Timing Diagram
N
www.murata-ps.com
MDA_ADS-939.A01 Page 5 of 7
Free Datasheet http://www.datasheet4u.com/
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet ADS-939.PDF ] | |
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