Analog Devices AD8612ARU, AD8611ARM, AD8611AR Datasheet
Ultrafast 4 ns
TOP VIEW
(Not to Scale)
14
13
12
11
10
9
8
1
2
3
4
5
6
7
QA
GND
LE A
Vⴚ
IN Aⴚ
IN A+
QB
QB
GND
LE B
V+
IN Bⴚ
IN B+
QA
AD8612
ⴙIN
ⴚIN
Vⴚ
OUT
GND
LATCH
OUT
1
45
8
AD8611
Vⴙ
Vⴙ
ⴙIN
Vⴚ
ⴚIN
OUT
OUT
GND
LATCH
AD8611
a
FEATURES
4 ns Propagation Delay at 5 V
Single Supply Operation: 3 V to 5 V
100 MHz Input
Latch Function
APPLICATIONS
High-Speed Timing
Clock Recovery and Clock Distribution
Line Receivers
Digital Communications
Phase Detectors
High-Speed Sampling
Read Channel Detection
PCMCIA Cards
Zero Crossing Detector
High-Speed A/D Converter
Upgrade for LT1394 and LT1016 Designs
GENERAL DESCRIPTION
The AD8611/AD8612 are single and dual 4 ns comparators with
latch function and complementary output.
Fast 4 ns propagation delay makes the AD8611/AD8612 a good
choice for timing circuits and line receivers. Propagation delays
for rising and falling signals are closely matched and track over
temperature. This matched delay makes the AD8611/AD8612 a
good choice for clock recovery, since the duty cycle of the output
will match the duty cycle of the input.
The AD8611 has the same pinout as the LT1016 and LT1394,
with lower supply current and a wider common-mode input range,
which includes the negative supply rail.
The AD8611/AD8612 is specified over the industrial (–40°C to
+85°C) temperature range. The AD8611 is available in both 8-lead
MSOP and narrow SO-8 surface mount packages. The AD8612
is available in 14-lead TSSOP surface-mount package.
Single Supply Comparators
AD8611/AD8612
PIN CONFIGURATIONS
8-Lead Narrow Body SO
(SO-8)
8-Lead MSOP
(RM-8)
14-Lead TSSOP
(RU-14)
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2000
AD8611/AD8612–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
(@ V+ = 5.0 V, V– = V
= 0 V, TA = 25ⴗC unless otherwise noted)
GND
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
–40°C ≤ T
Offset Voltage Drift ∆V
Input Bias Current I
Input Offset Current I
Input Common-Mode Voltage Range V
/∆T4µV/°C
OS
B
I
B
OS
CM
VCM = 0 V –6 –4 µA
–40°C ≤ TA ≤ +85°C –7 –4.5 µA
VCM = 0 V ± 4 µA
Common-Mode Rejection Ratio CMRR 0 V ≤ V
Large Signal Voltage Gain A
Input Capacitance C
VO
IN
RL = 10 kΩ 3,000 V/V
≤ +85°C8mV
A
0.0 3.0 V
≤ 3.0 V 55 85 dB
CM
17 mV
3.0 pF
LATCH ENABLE INPUT
Logic “1” Voltage Threshold V
Logic “0” Voltage Threshold V
Logic “1” Current I
Logic “0” Current I
IH
IL
IH
IL
VLH = 3.0 V –1.0 –0.3 µA
VLL = 0.3 V –5 –2.7 µA
2.0 1.65 V
1.60 0.8 V
Latch Enable
Pulsewidth t
Setup Time t
Hold Time t
PW(E)
S
H
3ns
0.5 ns
0.5 ns
DIGITAL OUTPUTS
Logic “1” Voltage V
Logic “1” Voltage V
Logic “0” Voltage V
OH
OH
OL
IOH = 50 µA, ∆VIN > 250 mV 3.0 3.35 V
IOH = 3.2 mA, ∆VIN > 250 mV 2.4 3.4 V
IOL = 3.2 mA, ∆VIN > 250 mV 0.25 0.4 V
DYNAMIC PERFORMANCE
Input Frequency f
Propagation Delay t
Propagation Delay t
MAX
P
P
400 mV p-p sine wave 100 MHz
200 mV Step with 100 mV Overdrive
–40°C ≤ T
≤ +85°C5ns
A
1
4.0 5.5 ns
100 mV Step with 5 mV Overdrive 5 ns
Differential Propagation Delay
(Rising Propagation Delay vs.
Falling Propagation Delay) ∆t
P
100 mV Step with 100 mV Overdrive
1
0.5 2.0 ns
Rise Time 20% to 80% 2.5 ns
Fall Time 80% to 20% 1.1 ns
POWER SUPPLY
Power Supply Rejection Ratio PSRR 4.5 V ≤ V+ ≤ 5.5 V 55 73 dB
V+ Supply Current
Ground Supply Current
V– Supply Current
2
2
2
I+ 5.7 10 mA
≤ +85°C10mA
A
∞
≤ +85°C7mA
A
3.5 7 mA
I
GND
–40°C ≤ T
VO = 0 V, RL =
–40°C ≤ T
I– 2.2 4 mA
–40°C ≤ TA ≤ +85°C5mA
NOTES
1
Guaranteed by design.
2
Per comparator.
Specifications subject to change without notice.
–2–
REV. 0
AD8611/AD8612
WARNING!
ESD SENSITIVE DEVICE
ELECTRICAL SPECIFICATIONS
(@ V+ = 3.0 V, V– = V
= 0 V, TA = 25ⴗC unless otherwise noted)
GND
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
Input Bias Current I
Input Common-Mode Voltage Range V
OS
B
I
B
CM
VCM = 0 V –6 –4.0 µA
–40°C ≤ TA ≤ +85°C –7 –4.5 µA
0 1.0 V
17 mV
Common-Mode Rejection Ratio CMRR 0 V ≤ VCM ≤ 1.0 V 55 dB
OUTPUT CHARACTERISTICS
Output High Voltage V
Output Low Voltage V
OH
OL
IOH = –3.2 mA, VIN > 250 mV 1.2
IOL = +3.2 mA, VIN > 250 mV 0.3 V
1
V
POWER SUPPLY
Power Supply Rejection Ratio PSRR 2.7 V ≤ V+ ≤ 6 V 46 dB
Supply Currents V
V+ Supply Current
Ground Supply Current
V– Supply Current
2
2
2
I+ 4.5 6.5 mA
I
GND
I– 2 3.5 mA
= 0 V, RL =
O
–40°C ≤ T
–40°C ≤ T
∞
≤ +85°C10mA
A
≤ +85°C 5.5 mA
A
2.5 3.5 mA
–40°C ≤ TA ≤ +85°C 4.8 mA
DYNAMIC PERFORMANCE
Propagation Delay t
NOTES
1
Output high voltage without pull-up resistor. It may be useful to have a pull-up resistor to V+ for 3 V operation.
2
Per comparator.
3
Guaranteed by design.
Specifications subject to change without notice.
P
100 mV Step with 20 mV Overdrive
3
4.5 6.5 ns
ABSOLUTE MAXIMUM RATINGS
Total Analog Supply Voltage . . . . . . . . . . . . . . . . . . . . . 7.0 V
Digital Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 V
Input Voltage
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 4 V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±5 V
Output Short-Circuit Duration to GND . . . . . . . . . Indefinite
Storage Temperature Range
R, RU, RM Packages . . . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Junction Temperature Range
R, RU, RM Packages . . . . . . . . . . . . . . . . –65°C to +150°C
Package Type
8-Lead SO (R) 158 43 °C/W
8-Lead MSOP (RM) 240 43 °C/W
14-Lead TSSOP (RU) 240 43 °C/W
NOTES
1
The analog input voltage is equal to ± 4 V or the analog supply voltage, whichever
is less.
2
θJA is specified for the worst-case conditions, i.e., θ
for P-DIP and θ
TSSOP packages.
is specified for device soldered in circuit board for SOIC and
JA
2
JA
JC
is specified for device in socket
JA
Lead Temperature Range (Soldering, 10 sec) . . . . . . . 300°C
ORDERING GUIDE
Temperature Package Package Branding
Model Range Description Option Information
AD8611ARM –40°C to +85°C 8-Lead Micro SOIC RM-8 G1A
AD8611AR –40°C to +85°C 8-Lead Small Outline IC SO-8
AD8612ARU –40°C to +85°C 14-Lead Thin Shrink Small Outline RU-14
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD8611/AD8612 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.
–3–REV. 0
Unit
AD8611/AD8612
8
V+ = 5V
7
OVERDRIVE > 10mV
6
5
4
3
2
PROPAGATION DELAY – ns
1
0
ⴚ50
ⴚ25
PDⴚ
PD+
0
25 50 75
TEMPERATURE – ⴗC
100
Figure 1. Propagation Delay Over Temperature
PROPAGATION DELAY – ns
18
16
14
12
10
8
6
4
2
0
PDⴚ
PD+
0
10 15 20
OVERDRIVE – mV
V+ = 5V
= 25ⴗC
T
A
255
Figure 2. Propagation Delay vs. Overdrive
18
V+ = 5V
= 25ⴗC
T
A
OVERDRIVE = 5mV
14
PDⴚ
PD+
1.0 1.5 2.0
2.50.5
PROPAGATION DELAY – ns
12
8
6
2
0
0
SOURCE RESISTANCE – k⍀
Figure 4. Propagation Delay vs. Source Resistance
8
7
6
5
4
3
2
PROPAGATION DELAY – ns
1
0
263
PD+
PDⴚ
SUPPLY VOLTAGE – V
TA = 25ⴗC
STEP = 100 mV
OVERDRIVE > 10 mV
45
Figure 5. Propagation Delay vs. Supply Voltage
8
V+ = 5V
T
7
A
OVERDRIVE > 10mV
6
5
4
3
2
PROPAGATION DELAY – ns
1
0
0
= 25ⴗC
40 60
CAPACITANCE – pF
PDⴚ
PD+
8020
Figure 3. Propagation Delay vs. Load Capacitance
35
TA = 25ⴗC
STEP = 100 mV
30
OVERDRIVE = 50 mV
25
20
15
10
PROPAGATION DELAY – ns
5
0
263
PDⴚ
COMMON-MODE VOLTAGE – V
45
PD+
Figure 6. Propagation Delay vs. Common-Mode Voltage
–4–
REV. 0
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