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PDF ADS926 Data sheet ( Hoja de datos )
| Número de pieza | ADS926 | |
| Descripción | 14-Bit/ 500kHz/ Low-Power Sampling A/D Converters | |
| Fabricantes | ETC | |
| 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
• Low power, 1.75 Watts maximum
• Samples up to Nyquist frequencies
• Outstanding dynamic performance
• Bipolar ±5V input range
GENERAL DESCRIPTION
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 full-
scale 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.
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) or military (–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.
ADS-926
14-Bit, 500kHz, Low-Power
Sampling A/D Converters
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 14 (LSB)
2 BIT 13
3 BIT 12
4 BIT 11
5 BIT 10
6 BIT 9
7 BIT 8
8 BIT 7
9 BIT 6
10 BIT 5
11 BIT 4
12 BIT 3
24 –12V/–15V SUPPLY
23 ANALOG GROUND
22 +12V/+15V SUPPLY
21 +10V REFERENCE OUT
20 ANALOG INPUT
19 ANALOG GROUND
18 BIT 1 (MSB)
17 BIT 2
16 START CONVERT
15 EOC
14 DIGITAL GROUND
13 +5V SUPPLY
+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
13
+5V SUPPLY
14
DIGITAL GROUND
22
+12V/+15V SUPPLY
19, 23
ANALOG GROUND
Figure 1. ADS-926 Functional Block Diagram
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)
24
–12V/–15V SUPPLY
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
1 page  
®®
ADS-926
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.
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
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADS926.PDF ] | |
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