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ADC-207 Arkusz danych(PDF) 1 Page - List of Unclassifed Manufacturers

Numer części ADC-207
Szczegółowy opis  7- BIT 20MHZ CMOS FLASH A/D CONVERTERS
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ADC-207 Arkusz danych(HTML) 1 Page - List of Unclassifed Manufacturers

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IN N O VA T IO N a n d E X C ELL E N C E
®
®
INPUT/OUTPUT
CONNECTIONS
DIP
LCC
PINS
FUNCTION
PINS
1
CLOCK INPUT
1
2
DIGITAL GROUND
4
3
–REFERENCE
5
4
ANALOG INPUT
6
5
MIDPOINT
7
6
+REFERENCE
8
7
ANALOG GROUND
9
8
CS1
11
9
CS2
12
10
OVERFLOW
13
11
BIT 1 (MSB)
14
12
BIT 2
16
13
BIT 3
17
14
BIT 4
19
15
BIT 5
20
16
BIT 6
21
17
BIT 7 (LSB)
23
18
+5V SUPPLY
24
Figure 1. ADC-207 Functional Block Diagram (DIP Pinout)
FEATURES
• 7-bit flash A/D converter
• 20MHz sampling rate
• Low power (250mW)
• Single +5V supply
• 1.2 micron CMOS technology
• 7-bit latched 3-state output with overflow bit
• Surface-mount versions
• High-reliability version
• No missing codes
GENERAL DESCRIPTION
The ADC-207 is the industry’s first 7-bit flash converter using an
advanced high-speed VLSI 1.2 micron CMOS process. This
process offers some very distinctive advantages over other
processes, making the ADC-207 unique. The smaller
geometrics of the process achieve high speed, better linearity
and superior temperature performance.
Since the ADC-207 is a CMOS device, it also has very low
power consumption (250mW). The device draws power from
a single +5V supply and is conservatively rated for 20MHz
operation. The ADC-207 allows using sampling apertures as
small as 12ns, making it more closely approach an ideal
sampler. The small sampling apertures also let the device
operate at greater than 20MHz.
The ADC-207 has 128 comparators which are auto-balanced
on every conversion to cancel out any offsets due to
temperature and/or dynamic effects. The resistor ladder has a
midpoint tap for use with an external voltage source to improve
integral linearity beyond 7 bits. The ADC-207 also provides the
user with 3-state outputs for easy interfacing to other
components.
There are six models of the ADC-207 covering two operating
temperature ranges, 0 to +70°C and –55 to +125°C. Two high-
reliability "QL" models are also available.
D
G Q
D
G Q
D
G Q
D
G Q
D
G Q
D
G Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
ANALOG INPUT 4
+REFERENCE 6
DIGITAL GROUND 2
ANALOG GROUND 7
RANGE MIDPOINT 5
R/2
R
R
R
R
R/2
R/2
–REFERENCE 3
CS1 8
9
+5V SUPPLY 18
+VDD
1 CLOCK INPUT
CLOCK
GENERATOR
10 OVERFLOW
11 BIT 1 (MSB)
12 BIT 2
13 BIT 3
14 BIT 4
15 BIT 5
16 BIT 6
17 BIT 7 (LSB)
128-TO-7
ENCODER
CS2
D
G Q
D
G Q
D
G Q
D
G Q
∅1
∅2
∅2
∅1
ADC-207
7-Bit, 20MHz, CMOS
Flash A/D Converters
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


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