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ADS-933 Schematic ( PDF Datasheet ) - Datel

Teilenummer ADS-933
Beschreibung 16-Bit / 3MHz Sampling A/D Converters
Hersteller Datel
Logo Datel Logo 




Gesamt 8 Seiten
ADS-933 Datasheet, Funktion
®®
INNOVATION and EXCELLENCE
PRELIMINARY PRODUCT DATA
ADS-933
16-Bit, 3MHz
Sampling A/D Converters
FEATURES
16-bit resolution
3MHz sampling rate
Functionally complete
No missing codes over full military temperature range
Edge-triggered
±5V supplies, 1.85 Watts
Small, 40-pin, ceramic TDIP
85dB SNR, –84dB THD
Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The low-cost ADS-933 is a 16-bit, 3MHz 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-933 has been optimized to
achieve a signal-to-noise ratio (SNR) of 85dB and a total
harmonic distortion (THD) of –84dB.
Packaged in a 40-pin TDIP, the functionally complete
ADS-933 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-933 only requires the
rising edge of the start convert pulse to operate.
Requiring only ±5V supplies, the ADS-933 dissipates 1.85
Watts. The device is offered with a bipolar (±2.75V) analog
input range and a unipolar 0 to –5.5V 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
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 FIFO/DIR
9 FIFO READ
10 FSTAT1
11 FSTAT2
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
40 NO CONNECTION
39 NO CONNECTION
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
GAIN ADJUST 6
GAIN
ADJUST
CKT.
POWER AND GROUNDING
+5V ANALOG SUPPLY 38
+5V DIGITAL SUPPLY 31
–5V SUPPLY
37
ANALOG GROUND
4, 36
DIGITAL GROUND
7, 30
NO CONNECTION 39, 40
+3.2V REF. OUT 1
OFFSET ADJUST 5
UNIPOLAR 2
ANALOG INPUT 3
OFFSET ADJUST 5
PRECISION
+3.2V REFERENCE
OFFSET
ADJUST
CKT.
S/H
START CONVERT 12
EOC 32
COMP. BITS 35
TIMING AND
CONTROL LOGIC
Figure 1. ADS-933 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
DATEL, Inc., Mansfield, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508) 339-6356 E-mail: [email protected] Internet: www.datel.com






ADS-933 Datasheet, Funktion
ADS-933
®®
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.
N N+1 N+2 N+3 N+4 N+5
START
CONVERT
50ns typ.
INTERNAL S/H
20ns typ.
Hold
Acquisition Time
170ns typ.
161ns typ.
53ns typ.
Conversion Time
178ns typ.
EOC
OUTPUT
DATA
20ns typ.
Data N-4 Valid
265ns typ.
Data N-3 Valid Data N-2 Valid Data N-1 Valid
68ns typ.
Invalid
Data
Data N Valid
Notes: 1. Scale is approximately 50ns per division. fs = 3MHz.
2. This device has three pipeline delays. Four start convert pulses (clock cycles) must be applied for valid data
from the first conversion to appear at the output of the A/D.
3. The start convert positive pulse width must be between either 20 and 60nsec or 200 and 310nsec
(when sampling at 3MHz) to ensure proper operation. For sampling rates lower than 3MHz, the start pulse
can be wider than 310nsec, however a minimum pulse width low of 20nsec should be maintained. A 3MHz
clock with a 50nsec positive pulse width is used for all production testing.
Figure 3. ADS-933 Timing Diagram
6

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