CA3304, CA3304A
August 1997
4-Bit, 25 MSPS,
Flash A/D Converters
Description
The Intersil CA3304 is a CMOS parallel (FLASH) analog-to-
digital converter designed for applications demanding both
low-power consumption and high speed digitization. Digitiz-
ing at 25MHz, for example, requires only about 35mW.
The CA3304 operates over a wide, full-scale signal input
voltage range of 0.5V up to the supply voltage. Power
consumption is as low as 10mW, depending upon the clock
frequency selected.
The intrinsic high conversion rate makes the CA3304 types
ideally suited for digitizing high speed signals. The over鏗俹w
bit makes possible the connection of two or more CA3304s
in series to increase the resolution of the conversion system.
A series connection of two CA3304s may be used to pro-
duce a 5-bit, 25MHz converter. Operation of two CA3304s in
parallel doubles the conversion speed (i.e., increases the
sampling rate from 25MHz to 50MHz). A data change pin
indicates when the present output differs from the previous,
thus allowing compaction of data storage.
Sixteen paralleled auto-balanced voltage comparators mea-
sure the input voltage with respect to a known reference to
produce the parallel-bit outputs in the CA3304. Fifteen com-
parators are required to quantize all input voltage levels in this
4-bit converter, and the additional comparator is required for
the over鏗俹w bit.
Features
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CMOS/SOS Low Power with Video Speed (Typ) . . 25mW
Parallel Conversion Technique
Single Power Supply Voltage . . . . . . . . . . . . 3V to 7.5V
25MHz Sampling Rate (40ns Conversion Time) at 5V
Supply
4-Bit Latched Three-State Output with Over鏗俹w and
Data Change Outputs
1
/ LSB Maximum Nonlinearity (A Version)
8
Inherent Resistance to Latch-Up Due to SOS Process
Bipolar Input Range with Optional Second Supply
Wide Input Bandwidth (Typ) . . . . . . . . . . . . . . . . 25MHz
Applications
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High Speed A/D Conversion
Ultrasound Signature Analysis
Transient Signal Analysis
High Energy Physics Research
General-Purpose Hybrid ADCs
Optical Character Recognition
Radar Pulse Analysis
Motion Signature Analysis
Robot Vision
RSSI Circuits
Ordering Information
PART NUMBER LINEARITY (INL, DNL)
CA3304E
CA3304AE
CA3304M
CA3304AM
CA3304D
CA3304AD
鹵0.25
LSB
鹵0.125
LSB
鹵0.25
LSB
鹵0.125
LSB
鹵0.25
LSB
鹵0.125
LSB
SAMPLING RATE
25MHz (40ns)
25MHz (40ns)
25MHz (40ns)
25MHZ (40ns)
25MHz (40ns)
25MHz (40ns)
TEMP. RANGE (
o
C)
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-55 to 125
-55 to 125
PACKAGE
16 Ld PDIP
16 Ld PDIP
16 Ld SOIC (W)
16 Ld SOIC (W)
16 Ld SBDIP
16 Ld SBDIP
PKG. NO.
E16.3
E16.3
M16.3
M16.3
D16.3
D16.3
Pinout
CA3304 (SBDIP, PDIP, SOIC)
TOP VIEW
BIT 1 (LSB) 1
BIT 2 2
BIT 3 3
BIT 4 4
DATA CHANGE (DC) 5
OVERFLOW (OF) 6
CE2 7
V
SS
8
16 V
DD
15 CLK
14 V
AA
-
13 V
REF
-
12 V
REF
+
11 V
IN
10 V
AA
+
9 CE1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright 漏 Intersil Corporation 1999
File Number
1790.2
4-7
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