®
ADS-117
®
12-Bit, 2MHz, Low-Power Sampling A/D Converters
PRODUCT OVERVIEW
DATEL's ADS-117 is a functionally complete,
12-bit, 2MHz, sampling A/D converter. Its standard, 24-pin, double-width DIP contains a fastsettling sample-hold amplifier, a 12-bit subranging
(two-step) A/D converter, a precision reference,
three-state output register and all the timing and
control logic necessary to operate from a single
start convert pulse. Digital input and output levels
are TTL.
FEATURES
Total harmonic distortion (THD) and signalto-noise ratio (including distortion) typically run
–78dB and 70dB, respectively, with full scale
inputs up to 100kHz. The ADS-117 requires ±15V
and +5V power supplies and typically consumes
1.6 Watts. Models are available for use in either
commercial (0 to +70°C) or military (–55 to
+125°C) operating temperature ranges and
extended commerical (–40 to +85°C).
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
12-bit resolution
PIN
FUNCTION
missing codes
No
1
BIT 12 (LSB)
24
–15V Supply
2
BIT 11
23
ANALOG GROUND
2MHz minimum throughput
3
BIT 10
22
+15V SUPPLY
Functionally complete
4
BIT 9
21
+10V REFERENCE
Small 24-pin DDIP
5
BIT 8
20
BIPOLAR
6
BIT 7
19
ANALOG INPUT
Low-power, 1.6 Watts
7
BIT 6
18
COMP BIN
Three-state output buffers
8
BIT 5
17
ENABLE (1-12)
9
BIT 4
16
START CONVERT
10
BIT 3
15
EOC
11
BIT 2
14
DIGITAL GROUND
12
BIT 1 (MSB)
13
+5V SUPPLY
Samples to Nyquist frequencies
BLOCK DIAGRAM
17 ENABLE (1-12)
DAC
12 BIT 1 (MSB)
REF
S/H
S1
REGISTER
–
+
10 BIT 3
9
BIT 4
8
BIT 5
7
BIT 6
6
BIT 7
5
BIT 8
4
BIT 9
3
BIT 10
2
BIT 11
1
BUFFER
BIPOLAR 20
ANALOG INPUT 19
3-STATE OUTPUT REGISTER
FLASH
ADC
DIGITAL CORRECTION LOGIC
S2
11 BIT 2
REGISTER
+10V REF. 21
BIT 12 (LSB)
•
e-mail: help@datel.com
COMP BIN 18
START CONVERT 16
TIMING AND
CONTROL LOGIC
EOC 15
13
14
22
23
24
+5V SUPPLY
DIGITAL GROUND
+15V SUPPLY
ANALOG GROUND
–15V SUPPLY
Figure 1. ADS-117 Functional Block Diagram
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
•
Tel: (508) 339-3000
•
www.datel.com
26 Sep 2012 MDA_ADS-117.C01 Page 1 of 7
