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PDF ADS-946 Data sheet ( Hoja de datos )
| Número de pieza | ADS-946 | |
| Descripción | 8MHz Sampling A/D Converters | |
| Fabricantes | Datel | |
| Logotipo |  |
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ADS-946
14-Bit, 8MHz Sampling A/D Converters
FEATURES
14-bit resolution
8MHz guaranteed sampling rate
No missing codes over full HI-REL temperature
range
Ideal for both time and frequency-domain
applications
Excellent THD (–75dB) and SNR (77dB)
Edge-triggered; No pipeline delays
Small, 24-pin, ceramic DDIP or SMT
Requires only ±5V supplies
Low-power, 2 Watts
MIL-STD-883 screening available
BLOCK DIAGRAM
PRODUCT OVERVIEW
The low-cost ADS-946 is a 14-bit, 8MHz sam-
pling A/D converter. This device accurately samples
full-scale input signals up to Nyquist frequencies
with no missing codes. Excellent differential nonlin-
earity error (DNL), signal-to-noise ratio (SNR), and
total harmonic distortion (THD) make the ADS-946
the ideal choice for both time-domain (CCD/FPA
imaging, scanners, process control) and frequency-
domain (radar, telecommunications, spectrum
analysis) applications.
The functionally complete ADS-946 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-
946 only requires the rising edge of a start convert
pulse to operate.
Requiring only ±5V supplies, the ADS-946
typically dissipates just 2 Watts. The device is
offered with a bipolar input range of ±2V. Models
are available for use in either commercial (0 to
+70°C), industrial (–40 to +100°C), or HI-REL
(–55 to +125°C) operating temperature ranges. A
proprietary, auto-calibrating, error-correcting circuit
allows the device to achieve specified performance
over the full HI-REL temperature range.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 1 (MSB)
24 ANALOG GROUND
2 BIT 2
23 OFFSET ADJUST
3 BIT 3
22 +5V ANALOG SUPPLY
4 BIT 4
21 ANALOG INPUT
5 BIT 5
20 –5V SUPPLY
6 BIT 6
19 ANALOG GROUND
7 BIT 7
18 START CONVERT
8 BIT 8
17 EOC
9 BIT 9
16 BIT 14 (LSB)
10 BIT 10
15 BIT 13
11 BIT 11
14 DIGITAL GROUND
12 BIT 12
13 +5V DIGITAL SUPPLY
OFFSET ADJUST 23
ANALOG INPUT 21
POWER AND GROUNDING
+5V ANALOG SUPPLY 22
+5V DIGITAL SUPPLY 13
–5V SUPPLY
20
ANALOG GROUND 19, 24
DIGITAL GROUND
14
–
S/H
+
BUFFER
FLASH
ADC
1
REF
Σ
DAC
FLASH
ADC
AMP 2
16 BIT 14 (LSB)
15 BIT 13
12 BIT 12
11 BIT 11
10 BIT 10
9 BIT 9
8 BIT 8
7 BIT 7
6 BIT 6
5 BIT 5
4 BIT 4
3 BIT 3
2 BIT 2
1 BIT 1 (MSB)
START CONVERT 18
EOC 17
TIMING AND
CONTROL LOGIC
Figure 1. ADS-946 Functional Block Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
03 Sep 2015 MDA_ADS-946.C01 Page 1 of 9
1 page  
ADS-946
14-Bit, 8MHz Sampling A/D Converters
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 precau-
tionary 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 under-
neath 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.
START
CONVERT
INTERNAL S/H
EOC
N
20ns
typ.
10ns typ.
70ns typ.
Hold
N+1
Acquisition Time
55ns typ.
60ns max.
20ns typ.
Conversion Time
78ns min., 85ns typ., 90ns max.
25ns typ.
OUTPUT
DATA
Data N-1 Valid
95ns typ.
30ns typ.
Invalid Data
10ns typ.
Data N Valid
Notes:
1. Scale is approximately 5ns per division. Sampling rate = 8MHz.
2. The start convert positive pulse width must be between 10 and 50ns or between 80 and 110ns (when sampling at 8MHz)
to ensure proper operation. For sampling rates less than 8MHz, the start pulse can be wider than 110nsec, however a
minimum pulse width low of 15nsec should be maintained. An 8MHz clock with a 20nsec positive pulse width is used
for all production testing.
Figure 4. ADS-946 Timing Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
03 Sep 2015 MDA_ADS-946.C01 Page 5 of 9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ADS-946.PDF ] | |
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