FEATURES
• 8-Bit flash A/D converter
• 20MHz sampling rate
• Complete support circuitry
• Low power, 1.5W
• 7MHz full power bandwidth
• Sample-hold not required
• Three-state outputs
• MIL-STD-883 versions
GENERAL DESCRIPTION
The ADC-228 combines analog front-end circuitry and a flash
A/D converter to digitize high-speed analog signals at a rate of
20 million samples per second. The ADC-228 contains an
8-bit, 20MHz, flash A/D, a wideband analog input buffer, a
precision voltage reference, temperature compensation
circuitry, reference trims, and a three-state output buffer in a
24-pin package.
The ADC-228 offers significant savings by combining all of the
circuitry in a single package. Valuable board real estate is
saved, and design time and manufacturing costs are reduced.
The ADC-228 is housed in a 24-pin ceramic DDIP package
and is available in the commercial, 0 to +70°C, or military,
–55 to +125°C, temperature ranges. A MIL-STD-883 version
is also available. Operation is from ±15V and +5V power
supplies.
INNOVATION and EX C ELL E N C E
® ® ADC-228
8-Bit, 20MHz, Complete
Flash A/D Converter
Figure 1. Functional Block Diagram
PIN FUNCTION PIN FUNCTION
1 +5V SUPPLY 24 BIT 8 (LSB)
2 GROUND 23 BIT 7
3 +5V REFERENCE OUT 22 BIT 6
4 GROUND 21 BIT 5
5 ANALOG INPUT 20 NO CONNECTION
6 GROUND 19 +15V SUPPLY
7 GROUND 18 CLOCK INPUT
8 NLINV 17 BIT 4
9 NMINV 16 BIT 3
10 –15V SUPPLY 15 BIT 2
11 CS1 14 BIT 1 (MSB)
12 CS1 13 NO CONNECTION
INPUT/OUTPUT CONNECTIONS
13 NO CONNECTION
20 NO CONNECTION
14 BIT 1 (MSB)
15 BIT 2
16 BIT 3
17 BIT 4
21 BIT 5
22 BIT 6
23 BIT 7
24 BIT 8 (LSB)
3 +5V REF. OUT
TRI-STATE
BUFFER
8-BIT
20MHz
FLASH
CONVERTER LINEARIZATION& TEMPERATURE
COMPENSATION
NETWORK
INPUT
BUFFER
CS1 11
CS1 12
NLINV 8
NMINV 9
CLOCK 18
ANALOG INPUT 5
+15V SUPPLY 19
GROUND 4
GROUND 7
GROUND 6
–15V SUPPLY 10
+5V SUPPLY 1
VOLTAGE
REFERENCE
NETWORK GROUND 2
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