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Details, datasheet, quote on part number:AD790S
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Datasheet text preview:
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FEATURES 45 ns max Propagation Delay Single 5 V or Dual 15 V Supply Operation CMOS or TTL Compatible Output 250 V max Input Offset Voltage 500 V max Input Hysteresis Voltage 15 V max Differential Input Voltage Onboard Latch 60 mW Power Dissipation Available in 8-Pin Plastic and Hermetic Cerdip Packages Available in Tape and Reel in Accordance with EIA-481A Standard APPLICATIONS Zero-Crossing Detectors Overvoltage Detectors Pulse-Width Modulators Precision Rectifiers Discrete A/D Converters Delta-Sigma Modulator A/Ds
+VS +IN IN VS 1
Fast, Precision Comparator AD790
CONNECTION DIAGRAMS 8-Pin Plastic Mini-DIP (N) and Cerdip (Q) Packages
8
AD790
2 3 4
VLOGIC OUTPUT GROUND LATCH
+
7 6 5
8-Pin SOIC (R) Package
1 2 GROUND LATCH VS IN
OUTPUT VLOGIC +VS +IN
AD790
8 7
4
+
3
6 5
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
The AD790 is a fast (45 ns), precise voltage comparator, with a number of features that make it exceptionally versatile and easy to use. The AD790 may operate from either a single 5 V supply or a dual ± 15 V supply. In the single-supply mode, the AD790's inputs may be referred to ground, a feature not found in other comparators. In the dual-supply mode it has the unique ability of handling a maximum differential voltage of 15 V across its input terminals, easing their interfacing to large amplitude and dynamic signals. This device is fabricated using Analog Devices' Complementary Bipolar (CB) process--which gives the AD790's combination of fast response time and outstanding input voltage resolution (1 mV max). To preserve its speed and accuracy, the AD790 incorporates a "low glitch" output stage that does not exhibit the large current spikes normally found in TTL or CMOS output stages. Its controlled switching reduces power supply disturbances that can feed back to the input and cause undesired oscillations. The AD790 also has a latching function which makes it suitable for applications requiring synchronous operation. The AD790 is available in five performance grades. The AD790J and the AD790K are rated over the commercial temperature range of 0°C to 70°C. The AD790A and AD790B are rated over the industrial temperature range of 40°C to +85°C. The AD790S is rated over the military temperature range of 55°C to +125°C. REV. C
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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
1. The AD790's combination of speed, precision, versatility and low cost makes it suitable as a general purpose comparator in analog signal processing and data acquisition systems. 2. Built-in hysteresis and a low-glitch output stage minimize the chance of unwanted oscillations, making the AD790 easier to use than standard open-loop comparators. 3. The hysteresis combined with a wide input voltage range enables the AD790 to respond to both slow, low level (e.g., 10 mV) signals and fast, large amplitude (e.g., 10 V) signals. 4. A wide variety of supply voltages is acceptable for operation of the AD790, ranging from single 5 V to dual +5 V/12 V, ± 5 V, or +5 V/± 15 V supplies. 5. The AD790's power dissipation is the lowest of any comparator in its speed range. 6. The AD790's output swing is symmetric between VLOGIC and ground, thus providing a predictable output under a wide range of input and output conditions.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002
AD790SPECIFICATIONS
DUAL SUPPLY
Parameter RESPONSE CHARACTERISTIC Propagation Delay, tPD OUTPUT CHARACTERISTICS Output HIGH Voltage, VOH
(Operation @ 25 C and +VS = 15 V, VS = 15 V, VLOGIC = 5 V unless otherwise noted.)
Conditions 100 mV Step 5 mV Overdrive TMIN to TMAX 1.6 mA Source 6.4 mA Source TMIN to TMAX 1.6 mA Sink 6.4 mA Sink TMIN to TMAX Min AD790J/A Typ Max 40 45 45/50 Min AD790K/B Typ Max 40 45 45/50 AD790S Min Typ Max 40 45 60 Unit ns ns
Output LOW Voltage, VOL
4.65 4.3 4.45 4.3/ 4.3 0.35 0.44
4.3 4.3 0.5 0.5/ 0.5 1.0 1.5 0.6 5 6.5 0.25 0.3
4.65 4.45 0.35 0.44
4.3 4.3 0.5 0.5 0.25 0.5 0.5 3.5 4.5 0.15 0.2
4.65 4.45 0.35 0.44
0.5 0.5 1.0 1.5 0.65 5 7 0.25 0.4
V V V V V mV mV mV µA µA µA µA dB dB
INPUT CHARACTERISTICS Offset Voltage1 Hysteresis2 Bias Current Offset Current TMIN to TMAX Power Supply Rejection Ratio DC Input Voltage Range Differential Voltage Common Mode Common Mode Rejection Ratio VS ± 2 0 % TMIN to TMAX VS ± 15 V VS 10 V
0.2 0.4 2.5 0.04
0.05 0.3 0.4 1.8 0.02
0.2 0.3 0.4 2.5 0.04
90 88 VS +VS2 V 95 90 20 2 25 5 35 10 0.8
88 85
100 93
80 76 VS +VS2 V VS
90 85
VS 88 85 105 100 20 2 25 5 1.6
VS V +VS2 V V 95 88 20 2 25 5 35 10 0.8 5 8 dB dB M pF ns ns V V µA µA
80 76
Input Impedance LATCH CHARACTERISTICS Latch Hold Time, tH Latch Setup Time, tS LOW Input Level, VIL HIGH Input Level, VIH Latch Input Current SUPPLY CHARACTERISTICS Diff Supply Voltage3 Logic Supply Quiescent Current +VS VS VLOGIC Power Dissipation TEMPERATURE RANGE Rated Performance
TMIN to TMAX TMIN to TMA X TMIN to TMAX VLOGIC = 5 V TMIN to TMAX TMIN to TMAX +VS = 15 V VS = 15 V VLOGIC = 5 V
35 10 0.8 1.6 3.5 5
1.6 2.3 5 7
2.3
2.3
4.5 4.0 8 4 2
33 7 10 5 3.3 242
4.5 4.0 8 4 2
33 7 10 5 3.3 242
4.7 4.2 8 4 2
33 7 10 5 3.3 242
V V mA mA mA mW °C
TMIN to TMAX
0 to 70/40 to +85
0 to 70/40 to +85
55 to +125
NOTES 1 Defined as the average of the input voltages at the low to high and high to low transition points. Refer to Figure 6. 2 Defined as half the magnitude between the input voltages at the low to high and high to low transition points. Refer to Figure 6. 3 +VS must be no lower than (V LOGIC 0.5 V) in any supply operating conditions, except during power up. All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final test. Specifications subject to change without notice.
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REV. C
AD790 SINGLE SUPPLY
Parameter RESPONSE CHARACTERISTIC Propagation Delay, tPD OUTPUT CHARACTERISTICS Output HIGH Voltage, VOH
(Operation @ 25 C and +VS = VLOGIC = 5 V, VS = 0 V unless otherwise noted.)1
Conditions 100 mV Step 5 mV Overdrive TMIN to TMAX 1.6 mA Source 6.4 mA Source TMIN to TMAX 1.6 mA Sink 6.4 mA Sink TMIN to TMAX Min AD790J/A Typ Max 45 50 50/60 Min AD790K/B Typ Max 45 50 50/60 AD790S Min Typ Max 45 50 65 Unit ns ns
4.3 4.3
4.65 4.45 0.35 0.44
4.3 4.3 0.5 0.5 1.5 2.0 0.75 5 7 0.25 0.3
4.65 4.45 0.35 0.44
4.3 4.3 0.5 0.5 0.6 0.85 0.65 3.5 5 0.15 0.2
4.65 4.45 0.35 0.44
Output LOW Voltage, VOL
0.5 0.5 1.5 2.0 1.0 5 8 0.25 0.4
V V V V V mV mV mV µA µA µA µA dB dB
INPUT CHARACTERISTICS Offset Voltage2 Hysteresis3 Bias Current Offset Current TMIN to TMAX Power Supply Rejection Ratio DC Input Voltage Range Differential Voltage Common Mode Input Impedance LATCH CHARACTERISTICS Latch Hold Time, tH Latch Setup Time, tS LOW Input Level, VIL HIGH Input Level, VIH Latch Input Current SUPPLY CHARACTERISTICS Supply Voltage4 Quiescent Current Power Dissipation TEMPERATURE RANGE Rated Performance 4.5 VVS5.5 V TMIN to TMAX TMIN to TMAX TMIN to TMAX Either Input TMIN to TMAX 0.3
0.45 0.5 2.7 0.04
0.35 0.3 0.5 2.0 0.02
0.45 0.3 0.7 2.7 0.04
80 90 76/76 88 VS +VS2 V
86 82
100 93
80 76 VS +VS2 V 0
90 85
0 20 2 25 5 TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX 4.5 10 1.6 2.3
0 20 2 25 5 1.6
20 2 25 5
VS V +VS2 V V M pF 35 10 0.8 5 8 7 12 60 ns ns V V µA µA V mA mW °C
35 10 0.8 5 7 7 12 60 4.5
35 10 0.8 1.6 3.5 5 7 12 60 4.7
2.3
2.3
10
10
TMIN to TMAX
0 to 70/40 to +85
0 to 70/40 to +85
55 to +125
NOTES 1 Pin 1 tied to Pin 8, and Pin 4 tied to Pin 6. 2 Defined as the average of the input voltages at the low to high and high to low transition points. Refer to Figure 6. 3 Defined as half the magnitude between the input voltages at the low to high and high to low transition points. Refer to Figure 6. 4 VS must not be connected above ground. All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final test. Specifications subject to change without notice.
REV. C
3
AD790
ABSOLUTE MAXIMUM RATINGS 1, 2 ORDERING GUIDE
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . 500 mW Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . ± 16.5 V Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range (N, R) . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to +125°C (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to +150°C Lead Temperature Range (Soldering 60 sec) . . . . . . . . 300°C Logic Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
NOTES 1 Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 Thermal characteristics: plastic N-8 package: JA = 90°C/watt; ceramic Q-8 package: JA = 110°C/watt, JC = 30°C/watt. SOIC (R-8) package: JA = 160°C watt; JC = 42°C/watt.
Model AD790JN AD790JR AD790JR-REEL AD790JR-REEL7 AD790KN* AD790AQ AD790BQ* AD790SQ
Temperature Range 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 40°C to +85°C 40°C to +85°C 55°C to +125°C
Package Package Description Option Plastic DIP SOIC Reel SOIC Plastic DIP Cerdip Cerdip Cerdip N-8 SO-8 R-8 N-8 Q-8 Q-8 Q-8
*Not for new designs; obsolete April 2002.
For military processed devices, please refer to the standard Microcircuit Drawing (SMD) available at www.dscc.dla.mil/programs/milspec/default.asp SMD Part Number 5962-9150501MPA*
*Not for new designs; obsolete April 2002.
ADI Equivalent AD790 SQ/883
+ 15V 0.1µF + 5V 0.1µF
LATCH (OPTIONAL)
+ 5V 0.1µF
LATCH (OPTIONAL)
510 1 +IN 2 8 5
510 1
7 6 4 OUTPUT
AD790
IN 3
+IN
2
8 5
AD790
IN 3 4 6
7
OUTPUT
0.1µF 15V
Figure 1. Basic Dual Supply Configuration (N, Q Package Pinout)
Figure 2. Basic Single Supply Configuration (N, Q Package Pinout)
0.1µF
+15V
+5V
0.1µF
100mV 2 130 25 3
1 8 5
1k TEK 7904 SCOPE
AD790
6 4
7
0.1µF
1.3V PULSE GENERATOR 1.7V
MPS 571
0.1µF 15V
HP8112
HP2835
50 400 650 5mV 5V 10 10k
5V VOLTAGE SOURCE
Figure 3. Response Time Test Circuit (N, Q Package Pinout)
4
REV. C
Typical Performace CharacteristicsAD790
TPC 1. Propagation Delay vs. Overdrive
TPC 2. Propagation Delay vs. Load Capacitance
TPC 3. Propagation Delay vs. Fanout (LSTTL and CMOS)
0.8
OUTPUT LOW VOLTAGE Volts
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 TEMP = +25°C
0
2
4
6
8
10
I SINK mA
TPC 4. Propagation Delay vs. Source Resistance
TPC 5. Propagation Delay vs. Temperature
TPC 6. Output Low Voltage vs. Sink Current
tH
5.0
OUTPUT LOW VOLTAGE Volts
INPUT
0
4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 0 2 4 6 ISOURCE mA 8 10
tPD VOH OUTPUT VOL tS VIH LATCH VIL
TEMP = +25°C
TPC 7. Output High Voltage vs. Source Current
TPC 8. Total Supply Current vs. Temperature
tS = SETUP TIME tH = HOLD TIME tPD = COMPARATOR RESPONSE TIME
Figure 4. Latch Timing
REV. C
5
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