ADC-30634 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – 8-Bit, 20MSPS CMOS Flash A/D

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®
ADC-30634/ADC-30720
8-Bit, 20MSPS CMOS Flash A/D
(ADC-208 Compatible)
FEATURES
• 8-bit flash A/D converter
• 20MHz sampling rate
• 10MHz full-power bandwidth
• Sample-hold not required
• Low power CMOS
• +5Vdc operation
• 1.2 Micron CMOS
• 8-Bit latched outputs
• Surface-mount version
• No missing codes
GENERAL DESCRIPTION
The ADC-30634 and ADC-30720 utilizes an advanced VLSI
1.2 micron CMOS in providing 20MHz sampling rates at
8-bits. The flexibility of the design architecture and process
delivers latch-up free operation without external components
and operation over the full military range.
The ADC-30634 and ADC-30720 are mechanically and
electrically equivalent to the ADC-208LM and ADC-
208MM-QL, respectively, with the exception of the
OVERFLOW (pin 13) and ENABLE (pins 11 and 12) functions.
These functions are not offered on the ADC-30634 and
ADC30720.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
1
VDD
2
CLOCK INPUT
3
–REFERENCE
4
ANA/DIG GND (VSS)
5
ANALOG INPUT
6
REF MIDPOINT
7
ANALOG INPUT
8
ANA/DIG GND (VSS)
9
+REFERENCE
10 VDD
11 N.C.
12 N.C.
PIN FUNCTION
24 BIT 8 (LSB)
23 BIT 7
22 BIT 6
21 BIT 5
20 REF 1/4 FS
19 VDD
18 REF 3/4 FS
17 BIT 4
16 BIT 3
15 BIT 2
14 BIT 1 (MSB)
13 N.C.
ANALOG INPUT 5,7
+REFERENCE 9
R2
R
1Ω
¾ REFERENCE 18
R
MIDPOINT 6
REFERENCE
¼ REFERENCE 20
1Ω _R2
R2
1Ω
R2
02
01
– REFERENCE 3
R
R2
PINS 1, 10, 19 +5V
+VDD
PINS 4-8
DIGITAL GND
ANALOG GND
D
GQ
D
GQ
D
GQ
256 to
7 ENCODER
D
GQ
D
GQ
02
CLOCK
01 GENERATOR
2 CLOCK
DQ
G
DQ
G
DQ
G
DQ
G
DQ
G
DQ
G
DQ
G
14 BIT 1
15 BIT 2
16 BIT 3
17 BIT 4
21 _{BIT 5}
22 BIT 6
23 BIT 7
24 ^{BIT 8}
(LSB)
Figure 1. ADC-30634 and ADC-30720 Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E–mail: [e-mail] • Internet: www.datel.com