
Figure 1. ADS-919 Functional Block Diagram
REF
R
R
18 BIT 1 (MSB)
17 BIT 2
12 IT 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)
TIMING AND
CONTROL LOGIC
+10V REF. OUT 21
START CONVERT 16
EOC 15
D
DAC
FLASH
ADC
BUFFER
–
+
S/H
ANALOG INPUT 20
13
+5V SUPPLY
22
+12V/+15V SUPPLY
19, 23
ANALOG GROUND
14
DIGITAL GROUND
24
–12V/–15V SUPPLY
S
2
S
1
BLOCK DIAGRAM
The ADS-919 is a high-performance, 14-bit,
2MHz sampling A/D converter. This device
accurately samples full-scale input signals up to
Nyquist frequencies with no missing codes. The
ADS-919 features outstanding dynamic perfor-
mance including a THD of –74dB.
Housed in a small 24-pin DDIP or SMT (gull-
wing) package, the functionally complete ADS-919
contains a fast-settling sample-hold amplifier, a sub-
ranging (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-919 typically dissipates 1.8W (1.5W
for ±12V). The unit is offered with a unipolar
input (0 to +10V). Models are available for use in
either commercial (0 to +70°C) or HI-REL (–55 to
+125°C) operating temperature ranges. Applica-
tions include radar, sonar, spectrum analysis, and
graphic/medical imaging.
PRODUCT OVERVIEW
FEATURES
■
14-bit resolution
■
2MHz sampling rate
■
No missing codes
■
Functionally complete
■
Small 24-pin DDIP or SMT package
■
Low power, 1.8 Watts
■
Operates from ±15V or ±12V supplies &
+5V supply
■
Edge-triggered; No pipeline delays
■
Unipolar 0 to +10V input range
INPUT/OUTPUT CONNECTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
FUNCTION
BIT 14 (LSB)
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
PIN
24
23
22
21
20
19
18
17
16
15
14
13
FUNCTION
–12V/–15V SUPPLY
ANALOG GROUND
+12V/+15V SUPPLY
+10V REFERENCE OUT
ANALOG INPUT
ANALOG GROUND
BIT 1 (MSB)
BIT 2
START CONVERT
EOC
DIGITAL GROUND
+5V SUPPLY
ADS-919
14-Bit, 2MHz, Low-Power Sampling A/D Converters
DATEL
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA Tel: (508) 339-3000 www.datel.com e-mail: help@datel.com
01 Apr 2011 MDA_ADS-919.B02
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