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PDF ADS-926 Data sheet ( Hoja de datos )
| Número de pieza | ADS-926 | |
| Descripción | Low-Power Sampling A/D Converters | |
| Fabricantes | Datel | |
| Logotipo |  |
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FEATURES
14-bit resolution
500kHz sampling rate
Functionally complete; No missing codes
Small 24-pin DDIP or SMT package
Operates from ±15V or ±12V supplies
+5V supply
Low power, 1.75 Watts maximum
Samples up to Nyquist frequencies
Outstanding dynamic performance
Bipolar ±5V input range (for unipolar 0 to 10V
input range see ADS-916)
For two’s complement output coding, please
order ADS-926-2 models
BLOCK DIAGRAM
ADS-926
14-Bit, 500kHz, Low-Power Sampling A/D Converters
PRODUCT OVERVIEW
The ADS-926 is a high-performance, 14-bit,
500kHz sampling A/D converter. This device
accurately samples full-scale input signals up to
Nyquist frequencies with no missing codes and
exhibits outstanding dynamic performance that
surpasses most 16-bit, 500kHz sampling A/D's.
THD and SNR, for example, are typically –90dB
and 80dB when converting fullscale input signals
up to 100kHz.
Housed in a small 24-pin DDIP or SMT (gull-
wing) package, the functionally complete ADS-926
contains a fast-settling sample-hold amplifier, a
subranging (two-pass) A/D converter, a precise
voltage reference, timing/control logic, and error-
correction circuitry. Digital input and output levels
are TTL. The ADS-926-2 series provide MSB at Pin
18 instead of MSB for two’s complement output
coding.
Requiring ±15V (or ±12V) and +5V supplies,
the ADS-926 dissipates only 1.75W (1.6W for
±12V), maximum. The unit is offered with a bipolar
input (–5V to +5V). 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.
Applications include radar, sonar, spectrum
analysis, and graphic/medical imaging. Contact
DATEL for information on devices screened to
MIL-STD-883.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 14 (LSB)
24 –12V/–15V SUPPLY
2 BIT 13
23 ANALOG GROUND
3 BIT 12
22 +12V/+15V SUPPLY
4 BIT 11
21 +10V REFERENCE OUT
5 BIT 10
20 ANALOG INPUT
6 BIT 9
19 ANALOG GROUND
7 BIT 8
18 BIT 1 (MSB)*
8 BIT 7
17 BIT 2
9 BIT 6
16 START CONVERT
10 BIT 5
15 EOC
11 BIT 4
14 DIGITAL GROUND
12 BIT 3
13 +5V SUPPLY
*MSB for ADS-926-2 models
+10V REF. OUT 21
ANALOG INPUT 20
S/H
–
+
REF
S2
FLASH
ADC
S1 BUFFER
DAC
START CONVERT 16
EOC 15
TIMING AND
CONTROL LOGIC
18 BIT 1 (MSB)
17 BIT 2
12 BIT 3
11 BIT 4
10 BIT 5
9 BIT 6
8 BIT 7
7 BIT 8
6 BIT 9
5 BIT 10
4 BIT 11
3 BIT 12
2 BIT 13
1 BIT 14 (LSB)
13
+5V SUPPLY
14
DIGITAL GROUND
22
+12V/+15V SUPPLY
19, 23
ANALOG GROUND
Figure 1. ADS-926 Functional Block Diagram
24
–12V/–15V SUPPLY
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
02 Oct 2015 MDA_ADS-926.C03.D1 Page 1 of 9
1 page  
THERMAL REQUIREMENTS
All DATEL sampling A/D converters are fully characterized and speci-
fied 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 specifica-
tion tables.
These devices do not normally require heat sinks; however, standard
precautionary design and layout procedures should be used to ensure
ADS-926
14-Bit, 500kHz, Low-Power Sampling A/D Converters
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.
START
CONVERT
10ns typ.
INTERNAL S/H
N
200ns
±25ns
Hold
610ns typ.
Acquisition Time
1390ns ±55ns
EOC
OUTPUT
DATA
10ns typ.
Conversion Time
480ns ±20ns
70ns ±10ns
Data (N – 1) Valid
Invalid
Data
35ns max.
115ns max.
Data N Valid (1885ns min.)
Notes: 1. fs = 500kHz.
2. The ADS-926 is a pulse-triggered device. Its internal operations
are triggered by both the rising and falling edges of the start
convert pulse. When sampling at 500kHz, the start pulse must be
between 175 and 225nsec wide. For lower sampling rates, wider
start pulses may be used, however, a 50nsec minimum pulse
width low must be maintained.
Figure 4. ADS-926 Timing Diagram
N+1
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
02 Oct 2015 MDA_ADS-926.C03.D1 Page 5 of 9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ADS-926.PDF ] | |
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