www.murata-ps.com
ADC-207
7-Bit, 20MHz, CMOS Flash A/D Converters
PRODUCT OVERVIEW
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 geo-
metrics 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.
FEATURES
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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
Æ2
Æ2
Æ1
CLOCK
GENERATOR
ANALOG INPUT 4
R/2
Æ1
1 CLOCK INPUT
10 OVERFLOW
DIP Pins
1
2
3
4
5
6
INPUT/OUTPUT CONNECTIONS
FUNCTION
CLOCK INPUT
DIGITAL GROUND
–REFERENCE
ANALOG INPUT
MIDPOINT
+REFERENCE
ANALOG GROUND
CS1
CS2
OVERFLOW
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7 (LSB)
+5V SUPPLY
LCC Pins
1
4
5
6
7
8
9
11
12
13
14
16
17
19
20
21
23
24
+REFERENCE 6
+5V SUPPLY 18
DIGITAL GROUND 2
R
+VDD
R
D
D Q
G
G Q
D Q
D
G Q
128-TO-7
ENCODER
G
D Q
G
D Q
D
R/2
G Q
G
D Q
G
D Q
D
R
G Q
G
D Q
G
D Q
G
11 BIT 1 (MSB)
ANALOG GROUND 7
R/2
12 BIT 2
7
8
9
10
11
RANGE MIDPOINT 5
13 BIT 3
14 BIT 4
12
13
14
15
16
R
15 BIT 5
–REFERENCE 3
D
G Q
16 BIT 6
17
18
17 BIT 7 (LSB)
CS1 8
CS2 9
Figure 1. ADC-207 Functional Block Diagram (DIP Pinout)
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: data.acquisition@murata-ps.com, tel:
+1 508 339 3000
MDA_ADC-207.B01
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MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
