® ® ADS-119
12-Bit, 10MHz, Low-Power
Sampling A/D Converters
Figure 1. ADS-119 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
FEATURES
• 12-bit resolution
• 10MHz minimum sampling rate
• Functionally complete
• Small 24-pin DDIP or SMT package
• Requires only ±5V supplies
• Low-power, 1.8 Watts
• Outstanding dynamic performance
• Edge-triggered
• No missing codes over temperature
• Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The ADS-119 is a high-performance, 12-bit, 10MHz sampling
A/D converter. The device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-119 features
excellent dynamic performance including a typical SNR of
69dB.
Packaged in a metal-sealed, ceramic, 24-pin DDIP, the
functionally complete ADS-119 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. All timing and control logic operates from
the rising edge of a single start convert pulse. Digital input and
output levels are TTL.
Requiring only ±5V supplies, the ADS-119 typically dissipates
1.8 Watts. The unit offers a bipolar input range of ±1.5V.
Models are available for use in either commercial (0 to +70°C)
or military (–55 to +125°C) operating temperature ranges.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
1 BIT 12 (LSB) 24 NO CONNECT
2 BIT 11 23 ANALOG GROUND
3 BIT 10 22 NO CONNECT
4 BIT 9 21 +5V ANALOG SUPPLY
5 BIT 8 20 –5V SUPPLY
6 BIT 7 19 ANALOG INPUT
7 BIT 6 18 ANALOG GROUND
8 BIT 5 17 OFFSET ADJUST
9 BIT 4 16 START CONVERT
10 BIT 3 15 DATA VALID
11 BIT 2 14 DIGITAL GROUND
12 BIT 1 13 +5V DIGITAL SUPPLY
Typical applications include signal analysis, medical/graphic
imaging, process control, ATE, radar, and sonar.
REF
DAC
RE
GI
ST
ER
RE
GI
ST
ER
OU
TP
UT
R
EG
IS
TE
R
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
7 BIT 6
6 BIT 7
5 BIT 9
4 BIT 9
3 BIT 10
2 BIT 11
1 BIT 12 (LSB)
TIMING AND
CONTROL LOGIC
OFFSET ADJUST 17
ANALOG INPUT 19
START CONVERT 16
DATA VALID 15
–
+
S/H
BUFFER
DI
GI
TA
L C
OR
RE
CT
IO
N
LO
GI
C
FLASH
ADC
1
FLASH
ADC
2
Σ
AMP
21
+5V ANALOG
SUPPLY
20
–5V SUPPLY
18, 23
ANALOG
GROUND
13
+5V DIGITAL
SUPPLY
14
DIGITAL
GROUND
22, 24
NO CONNECT