ADS-118A ETC [List of Unclassifed Manufacturers], ADS-118A Datasheet

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ADS-118A

Manufacturer Part Number
ADS-118A
Description
12-Bit, 5MHz, Low-Power Sampling A/D Converters
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet
1.ADS-118A.pdf (8 pages)
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
FEATURES
GENERAL DESCRIPTION
DATEL's ADS-118 and ADS-118A are 12-bit, 5MHz, sampling
A/D converters packaged in space-saving 24-pin DDIP’s. The
ADS-118 offers an input range of ±1V and has three-state
outputs. The ADS-118A has an input range of ±1.25V and
features direct adjustment of offset error.
These functionally complete low-power devices (1.3 Watts)
contain an internal fast-settling sample/hold amplifier, a 12-bit
subranging A/D converter, a precise voltage reference, timing/
control logic, and error-correction circuitry. All timing and
control logic operates from the rising edge of a single start
convert pulse. Digital input and output levels are TTL. Models
are available for use in either commercial (0 to +70°C) or
military (–55 to +125°C) operating temperature ranges.
Applications include radar, transient signal analysis, process
control, medical/graphic imaging, and FFT spectrum analysis.
12-bit resolution
5MHz minimum sampling rate
Functionally complete
Small 24-pin DDIP
Requires only ±5V supplies
Low-power, 1.3 Watts
Outstanding dynamic performance
No missing codes over full military temperature range
Edge-triggered, no pipeline delay
Ideal for both time and frequency-domain applications
®
I N N O V A T I O N a n d E X C E L L E N C E
START CONVERT 16
OFFSET ADJUST 17
(ADS-118A only)
ANALOG INPUT 19
EOC 15
+5V ANALOG
SUPPLY
21
CONTROL LOGIC
–
+
S/H
TIMING AND
®
Figure 1. ADS-118/118A Functional Block Diagram
+5V DIGITAL
SUPPLY
13
AMP
BUFFER
REF
GROUND
DIGITAL
FLASH
FLASH
ADC
DAC
ADC
14
Tel: (508) 339-3000 Fax: (508) 339-6356
1
2
–5V SUPPLY
* ADS-118, Pin 17 is ENABLE
PIN
10
11
12
ADS-118A, Pin 17 is OFFSET ADJUST
1
2
3
4
5
6
7
8
9
20
FUNCTION
BIT 12 (LSB)
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)
ADS-118, ADS-118A
INPUT/OUTPUT CONNECTIONS
Sampling A/D Converters
12-Bit, 5MHz, Low-Power
GROUND
ANALOG
18, 23
For immediate assistance: (800) 233-2765
NO CONNECT
22, 24
PIN
24
23
22
21
20
19
18
17
16
15
14
13
*
FUNCTION
NO CONNECTION
ANALOG GROUND
NO CONNECTION
+5V ANALOG SUPPLY
–5V SUPPLY
ANALOG INPUT
ANALOG GROUND
ENABLE/OFFSET ADJ.
START CONVERT
EOC
DIGITAL GROUND
+5V DIGITAL SUPPLY
17 ENABLE
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9
8
7
6
5
4
3
2
1
(ADS-118A only)
BIT 4
BIT 5
BIT 6
BIT 7
BIT 9
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)

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ADS-118A Summary of contents

Page 1

... DATEL's ADS-118 and ADS-118A are 12-bit, 5MHz, sampling A/D converters packaged in space-saving 24-pin DDIP’s. The ADS-118 offers an input range of ±1V and has three-state outputs. The ADS-118A has an input range of ±1.25V and features direct adjustment of offset error. These functionally complete low-power devices (1.3 Watts) ...

Page 2

... Lead Temperature (10 seconds) +300 FUNCTIONAL SPECIFICATIONS (T = +25°C, ±V = ±5V, 5MHz sampling rate, and a minimum 3 minute warmup A DD ANALOG INPUT MIN. Input Voltage Range, ADS-118 — Input Resistance 475 Input Capacitance — DIGITAL INPUT Logic Levels Logic "1" +2.0 Logic "0" ...

Page 3

... The device must be continuously converting during this time. Input voltage ranges for ADS-118A is ±1.25V A 100ns wide start convert pulse is used for all production testing. For applications requiring less than an 5MHz sampling rate, wider start convert pulses can be used ...

Page 4

... LSB's (+0.99927V for ADS-118; +1.249085V for ADS-118A). Zero/Offset Adjust Procedure 1. Apply a train of pulses to the START CONVERT input (pin 16) so the converter is continuously converting. 2. Apply +244µV (ADS-118) or +305µV (ADS-118A) to the ANALOG INPUT (pin 19). +15V 20k 1.2M ...

Page 5

... CONVERT 10ns typ. INTERNAL S/H EOC OUTPUT DATA N-1 VALID DATA 130ns min. 150ns typ ADS-118 ADS-118A 18 Figure 3. Typical Connection Diagram N Acquisition Time Hold 85ns typ. 90ns max. 35ns min., 40ns typ., 50ns max. 30ns, ±5ns Conversion Time 140ns typ., 150ns max. ...

Page 6

... Figure 6. ADS-118 Histogram and Differential Nonlinearity 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. ...

Page 7

... Figure 7. ADS-118/118A Evaluation Board Schematic (ADS-B118) ...

Page 8

... ADS-118MC 0 to +70°C ADS-118MM –55 to +125°C ADS-118AMC 0 to +70°C ADS-118AMM –55 to +125°C Receptacles for PC board mounting can be ordered through AMP, Inc., Part # 3-331272-8 (Component Lead Socket), 24 required. For MIL-STD-883 product, or surface mount packaging, contact DATEL. ® ® DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights ...

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