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PDF ADS-929 Data sheet ( Hoja de datos )
| Número de pieza | ADS-929 | |
| Descripción | Low-Power Sampling A/D Converters | |
| Fabricantes | Datel | |
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ADS-929
14-Bit, 2MHz, Low-Power Sampling A/D Converters
FEATURES
14-bit resolution
2MHz sampling rate
No missing codes
Functionally complete
Small 24-pin DDIP or SMT package
Low power, 1.7 Watts
Operates from ±15V or ±12V supplies
Edge-triggered; No pipeline delays
Bipolar ±5V input range (for unipolar 0 to +10V
input range see ADS-919 data sheet)
BLOCK DIAGRAM
PRODUCT OVERVIEW
The ADS-929 is a high-performance, 14-bit,
2MHz sampling A/D converter. This device samples
input signals up to Nyquist frequencies with no
missing codes. The ADS-929 features outstanding
dynamic performance including a THD of –79dB.
Housed in a small 24-pin DDIP or SMT (gull-
wing) package, the functionally complete ADS-929
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-929 typically dissipates 1.7W (1.4W for
±12V). 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.
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
+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-929 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 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
12 Aug 2015 MDA_ADS-929.D01 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-929
14-Bit, 2MHz, 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
INTERNAL S/H
EOC
N
200ns
typ.
10ns typ.
Hold
310ns typ.
30ns typ.
OUTPUT
DATA
Data (N – 1) Valid
N+1
Acquisition Time
190ns
±40ns
70ns ±10ns
Conversion Time
360ns ±20ns
35ns max.
75ns max.
Data N Valid
425ns min.
Invalid
Data
Notes: 1. fs = 2MHz.
2. The ADS-929 is an edge-triggered device. All internal operations
are triggered by the rising edge of the start convert pulse, which
may be as narrow as 20nsec. All production testing is performed
at a 2MHz sampling rate with 200nsec wide start pulses. For
lower sampling rates, wider start pulses may be used, however, a
minimum pulse width low of 20nsec must be maintained.
Figure 4. ADS-929 Timing Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
12 Aug 2015 MDA_ADS-929.D01 Page 5 of 9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ADS-929.PDF ] | |
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