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ADC10662/ADC10664 10-Bit 360 ns A/D Converter with Input Multiplexer and Sample/Hold
January 1995
ADC10662/ADC10664 10-Bit 360 ns
A/D Converter with Input Multiplexer and Sample/Hold
General Description
Using an innovative, patented multistep* conversion tech-
nique, the 10-bit ADC10662 and ADC10664 are 2- and 4-in-
put CMOS analog-to-digital converters offering sub-micro-
second conversion times yet dissipating a maximum of only
235 mW. The ADC10662 and ADC10664 perform a 10-bit
conversion in two lower-resolution ``flashes'', thus yielding a
fast A/D without the cost, power dissipation, and other
problems associated with true flash approaches. In addition
to standard static performance specifications (Linearity,
Full-Scale Error, etc.) dynamic performance (THD,
S/N) is guaranteed.
The analog input voltage to the ADC10662 and ADC10664
is sampled and held by an internal sampling circuit. Input
signals at frequencies from dc to over 250 kHz can there-
fore be digitized accurately without the need for an external
sample-and-hold circuit.
The ADC10662 and ADC10664 include a ``speed-up'' pin.
Connecting an external resistor between this pin and ground
reduces the typical conversion time to as little as 360 ns.
For ease of interface to microprocessors, the ADC10662
and ADC10664 have been designed to appear as a memory
location or I/O port without the need for external interface
logic.
Features
Y
Built-in sample-and-hold
Y
Single
a
5V supply
Y
2- or 4-input multiplexer options
Y
No external clock required
Key Specifications
Y
Conversion time to 10 bits 360 ns typical,
466 ns max over temperature
Y
Sampling Rate 1.5 MHz (min)
Y
Low power dissipation 235 mW (max)
Y
Total harmonic distortion (50 kHz)
b
60 dB (max)
Y
No missing codes over temperature
Applications
Y
Digital signal processor front ends
Y
Instrumentation
Y
Disk drives
Y
Mobile telecommunications
Ordering Information
ADC10662
ADC10664
Industrial
Package
Industrial
Package
(
b
40
§
C
s
T
A
s a
85
§
C)
ADC10662CIN
(
b
40
§
C
s
T
A
s a
85
§
C)
ADC10664CIN
N24A Molded DIP
N28B Molded DIP
ADC10662CIWM
M24B Small Outline
ADC10664CIWM
M28B Small Outline
*U.S. Patent Number 4918449
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/H/11192
RRD-B30M75/Printed in U. S. A.
Absolute Maximum Ratings
(Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
a
e
AV
CC
e
DV
CC
)
b
0.3V to
a
6V
Voltage at Any Input or Output
b
0.3V to V
a
a
0.3V
Input Current at Any Pin (Note 3)
Storage Temperature Range
b
65
§
Cto
a
150
§
C
Junction Temperature
150
§
C
Operating Ratings
(Notes 1, 2)
Temperature Range
T
MIN
s
T
A
s
T
MAX
5 mA
ADC10662CIN, ADC10662CIWM,
ADC10664CIN,
ADC10664CIWM
Package Input Current (Note 3)
20 mA
b
40
§
C
s
T
A
s a
85
§
C
Power Dissipation (Note 4)
875 mW
Supply Voltage Range
4.5V to 5.5V
ESD Susceptability (Note 5)
2000V
Soldering Information (Note 6)
N Package (10 Sec)
260
§
C
SO Package:
Vapor Phase (60 Sec)
215
§
C
Infrared (15 Sec)
220
§
C
Converter Characteristics
The following specifications apply for V
a
ea
5V, V
REF(
a
)
ea
5V, V
REF(
b
)
e
GND, and Speed Adjust pin connected to
ground through a 14.0 k
X
resistor (Mode 1) or an 8.26 k
X
resistor (Mode 2) unless otherwise specified. Boldface limits apply
for T
A
e
T
J
e
T
Min
to T
Max
; all other limits T
A
e
T
J
ea
25
§
C.
Symbol
Parameter
Conditions
Typical
Limit
Units
(Note 7)
(Note 8)
(Limit)
Resolution
10
Bits
Integral Linearity Error
g
0.5
g
1.0/
g
1.5 LSB
Offset Error
g
1
LSB (max)
Full-Scale Error
g
1
LSB (max)
Total Unadjusted Error
g
0.5
g
1.5/
g
2.0 LSB
Missing Codes
0
(max)
Power Supply Sensitivity
V
a
e
5V
g
5%, V
REF
e
4.5V
g
(/16
LSB
V
a
e
5V
g
10%, V
REF
e
4.5V
g
(/8
LSB
THD
Total Harmonic Distortion (Note 10)
f
IN
e
1 kHz, 4.85 V
P-P
b
68
dB
f
IN
e
50 kHz, 4.85 V
P-P
b
66
b
60
dB (max)
f
IN
e
100 kHz, 4.85 V
P-P
b
62
dB
f
IN
e
240 kHz, 4.85 V
P-P
b
58
dB
SNR Signal-to-Noise Ratio (Note 10)
f
IN
e
1 kHz, 4.85 V
P-P
61
dB
f
IN
e
50 kHz, 4.85 V
P-P
60
58
dB (min)
f
IN
e
100 kHz, 4.85 V
P-P
60
dB
ENOB Effective Number of Bits (Note 10)
f
IN
e
1 kHz, 4.85 V
P-P
9.6
Bits
f
IN
e
50 kHz, 4.85 V
P-P
9.5
9
Bits (min)
R
REF
Reference Resistance
650
400
X
(min)
900
X
(max)
V
REF(
a
)
V
REF(
a
)
Input Voltage
V
a
a
0.05 V (max)
V
REF(
b
)
V
REF(
b
)
Input Voltage
GND
b
0.05 V (min)
V
REF(
a
)
V
REF(
a
)
Input Voltage
V
REF(
b
)
V (min)
V
REF(
b
)
V
REF(
b
)
Input Voltage
V
REF(
a
)
V (max)
V
IN
Input Voltage
V
a
a
0.05 V (max)
V
IN
Input Voltage
GND
b
0.05 V (min)
OFF Channel Input Leakage Current
CS
e
V
a
,V
IN
e
V
a
0.01
3
m
A (max)
ON Channel Input Leakage Current CS
e
V
a
,V
IN
e
V
a
g
1
b
3
m
A (max)
2
DC Electrical Characteristics
The following specifications apply for V
a
ea
5V, V
REF(
a
)
e
5V V
REF(
b
)
e
GND, and Speed Adjust pin connected to ground
through a 14.0 k
X
resistor (Mode 1) or an 8.26 k
X
resistor (Mode 2) unless otherwise specified. Boldface limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
; all other limits T
A
e
T
J
ea
25
§
C.
Symbol
Parameter
Conditions
Typical
Limit
Units
(Note 7)
(Note 8)
(Limits)
V
IN(1)
Logical ``1'' Input Voltage
V
a
e
5.5V
2.0
V (min)
V
IN(0)
Logical ``0'' Input Voltage
V
a
e
4.5V
0.8
V (max)
I
IN(1)
Logical ``1'' Input Current
V
IN(1)
e
5V
0.005
3.0
m
A (max)
I
IN(0)
Logical ``0'' Input Current
V
IN(0)
0V
b
0.005
b
3.0
m
A (max)
V
OUT(1)
Logical ``1'' Output Voltage
V
a
e
4.5V, I
OUT
eb
360
m
A
2.4
V (min)
V
a
e
4.5V, I
OUT
eb
10
m
A
4.25
V (min)
V
OUT(0)
Logical ``0'' Output Voltage
V
a
e
4.5V, I
OUT
e
1.6 mA
0.4
V (max)
I
OUT
TRI-STATE
É
Output Current V
OUT
e
5V
0.1
50
m
A (max)
V
OUT
e
0V
b
0.1
b
50
m
A (max)
DI
CC
DV
CC
Supply Current
CS
e
S/H
e
RD
e
0
1.0
2
mA (max)
AI
CC
AV
CC
Supply Current
CS
e
S/H
e
RD
e
0
30
45
mA (max)
AC Electrical Characteristics
The following specifications apply for V
a
ea
5V, t
r
e
t
f
e
20 ns, V
REF(
a
)
e
5V, V
REF(
b
)
e
GND, and Speed Adjust pin
connected to ground through a 14.0 k
X
resistor (Mode 1) or an 8.26 k
X
resistor (Mode 2) unless otherwise specified. Boldface
limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
; all other limits T
A
e
T
J
ea
25
§
C.
Symbol
Parameter
Conditions
Typical
Limit
Units
(Note 7)
(Note 8)
(Limits)
t
CONV
Mode 1 Conversion
T
ime
CIN, CIWM Suffixes
from Rising Edge
of S
/H
360
466 ns (max)
to Falling Edge of INT
t
CRD
Mode 2 Conversion Time
CIN, CIWM Suffixes
470
610 ns (max)
t
ACC1
Access
Tim
e (Delay from Falling Mode 1; C
L
e
100 pF
30
50 ns (max)
Edge of RD to Output Valid)
t
ACC2
Access
Tim
e (Delay from Falling Mode 2;
CIN, CIWM Suffixes
475
616 ns (max)
Edge of RD to Output Valid)
C
L
e
100 pF
t
SH
Minimum Sample Time
Mode 1 (Figure1) ; (Note 9)
150 ns (max)
t
1H
,t
0H
TRI-STATE Control
(De
lay
R
L
e
1k, C
L
e
10 pF
from Rising Edge of RD
30
60 ns (max)
to High-Z State)
t
INTH
Delay from Rising
Edg
e of RD C
L
e
100 pF
25
50 ns (max)
to Rising Edge of INT
t
P
Delay from End of Conversion
50 ns (max)
to Next Conversion
3
AC Electrical Characteristics
(Continued)
The following specifications apply for V
a
ea
5V, t
r
e
t
f
e
20 ns, V
REF(
a
)
e
5V, V
REF(
b
)
e
GND, and Speed Adjust pin
connected to ground through a 14.0 k
X
resistor (Mode 1) or an 8.26 k
X
resistor (Mode 2) unless otherwise specified. Boldface
limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
; all other limits T
A
e
T
J
ea
25
§
C. (Continued)
Symbol Parameter Conditions
Typical Limit Units
(Note 7) (Note 8) (Limits)
t
MS
Multiplexer Control Setup Time 10 75 ns (max)
t
MH
Multiplexer Hold Time 10 40 ns (max)
C
VIN
Analog Input Capacitance 35 pF (max)
C
OUT
Logic Output Capacitance 5 pF (max)
C
IN
Logic Input Capacitance 5 pF (max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional. These ratings do not guarantee specific performance limits, however. For guaranteed specifications and test conditions, see the Electrical Characteris-
tics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under
the listed test conditons.
Note 2: All voltages are measured with respect to GND, unless otherwise specified.
Note 3: When the input voltage (V
IN
) at any pin exceeds the power supply rails (V
IN
k
GND or V
IN
l
V
a
) the absolute value of current at that pin should be limited
to 5 mA or less. The 20 mA package input current limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
i
JA
and the ambient temperature, T
A
. The maximum
allowable power dissipation at any temperature is P
D
e
(T
JMAX
b
T
A
)/
i
JA
or the number given in the Absolute Maximum Ratings, whichever is lower. In most
cases, the maximum derated power dissipation will be reached only during fault conditions. For these devices, T
JMAX
for a board-mounted device can be found
from the tables below:
ADC10662
ADC10664
Suffix
i
JA
(
§
C/W)
Suffix
i
JA
(
§
C/W)
CIN
60
CIN
53
CIWM
82
CIWM
78
Note 5: Human body model, 100 pF discharged through a 1.5 k
X
resistor.
Note 6: See AN-450 ``Surface Mounting Methods and Their Effect on Product Reliability'' or the section titled ``Surface Mount'' found in a current National
Semiconductor Linear Data Book for other methods of soldering surface mount devices.
Note 7: Typicals represent most likely parametric norm.
Note 8: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 9: Accuracy may degrade if t
SH
is shorter than the value specified. See curves of Accuracy vs t
SH
.
Note 10: THD, SNR, and ENOB are tested in Mode 1. Measuring these quantities in Mode 2 yields similar values.
4
Typical Performance Characteristics
Zero (Offset) Error
Linearity Error
Analog Supply Current
vs Reference Voltage
vs Reference Voltage
vs Temperature
Digital Supply Current
Conversion Time
Conversion Time
vs Temperature
vs Temperature
vs Temperature
Conversion Time vs
Conversion Time vs
Spectral Response with
Speed-Up Resistor
Speed-Up Resistor
100 kHz Sine Wave Input
Spectral Response with
100 kHz Sine Wave Input
TL/H/11192±1
5
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