ANALOG DEVICES AD8214 Service Manual
High Voltage
www.BDTIC.com/ADI
FEATURES
Input-to-output response: <100 ns
High input common-mode voltage range
Operating: 5 V to 65 V
Survival: 0 V to 68 V
Current output
Hysteresis: 10 mV
Integrated 2.4 V regulator
Wide operating temperature range: –40°C to +125°C
8-lead MSOP package
APPLICATIONS
Overcurrent protection
Motor controls
Transmission controls
Diesel injection controls
DC-to-DC converters
Power supplies
Batteries
Threshold Detector
FUNCTIONAL BLOCK DIAGRAM
1
V
S
2
+IN
8
–IN
2.4V
REGULATOR
3
V
REG
6
GND
Figure 1.
AD8214
5
OUT
06193-001
GENERAL DESCRIPTION
The AD8214 is a fast, high common-mode voltage threshold
detector, which operates with a single supply of 5 V to 65 V.
Internally the AD8214 features a fast comparator that is
optimized for high side operation. It also includes a stable
2.4 V series regulator, which is referenced with respect to the
supply voltage. The purpose of the regulator is to provide
power to the internal electronics, and set an input comparison
threshold below the supply voltage. The inputs of the AD8214
may be operated at, slightly above, or below the power supply.
The differential voltage range between the inputs of the
AD8214 is 500 mV.
The device features a current output. This current is <100 nA
when –IN > +IN and 1 mA when +IN > –IN. The input
voltages are referenced to the supply voltage, as is the
internal 2.4 V regulator. The input-to-output response time
is typically <100 ns.
As the output switches from low to high, a small hysteresis
(10 mV) is activated to minimize the effects of noise in the
system, and prevent any false state conditions.
The AD8214 is available in an 8-lead MSOP package. The
operating temperature range is –40°C to +125°C, making it
ideal for industrial, consumer, and automotive applications.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.
AD8214
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
10/06—Revision 0: Initial Version
Theory of Operation ...................................................................... 10
Comparator Offset and Hysteresis........................................... 11
Setting the Input Threshold Voltage........................................ 11
Input-Referred Dynamic Error ................................................ 11
Applications..................................................................................... 12
Typical Setup and Calculations ................................................ 12
High Side Overcurrent Detection ............................................ 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
Rev. 0 | Page 2 of 16
AD8214
www.BDTIC.com/ADI
SPECIFICATIONS
VS = 13.5 V, unless otherwise noted.
Table 1.
Parameter Conditions/Comments Min Typ Max Unit
VOLTAGE OFFSET
= 25°C, voltage at –IN decreasing
Offset Voltage (RTI)
T
A
Over Temperature (RTI) ±2.5 mV
Offset Drift 15 µV/°C
HYSTERESIS
T
= 25°C, voltage at –IN increasing
A
8 10 12 mV
INPUT
Input Impedance
Differential 2 MΩ
Common Mode VS = 5 V to 65 V 5 MΩ
Voltage Range
Differential Maximum voltage between +IN and –IN 500 mV
Common Mode
V
– 0.9 VS + 0.2 V
S
Input Bias Current +IN or –IN 12 20 nA
OUTPUT
Output Current R
R
Rise Time 20% to 80%, R
20% to 80%, R
Fall Time 20% to 80%, R
20% to 80%, R
= 3.3 kΩ, output high 0.8 1 1.2 mA
OUT
= 3.3 kΩ, output low 100 nA
OUT
= 3.3 kΩ, VOD = 5 mV, 50 mV step 90 ns
OUT
= 3.3 kΩ, V
OUT
= 3.3 kΩ, VOD = 5 mV, 50 mV step 110 ns
OUT
= 3.3 kΩ, V
OUT
= >20 mV, 50 mV step 75 ns
OD
= >10 mV, 50 mV step 100 ns
OD
REGULATOR
Nominal Value
T
= 25°C, voltage from V
A
T
= –40°C to +125°C
A
REG
to V
S
2.43 V
±5 %
DYNAMIC RESPONSE 50 mV to 250 mV step
Propagation Delay
1
5 mV ≤ VOD ≤ 15 mV, output low to high 90 ns
15 mV ≤ VOD ≤ 30 mV, output low to high 80 ns
V
INPUT-REFERRED DYNAMIC ERROR
2
≥ 30 mV, output low to high 75 ns
OD
15 mV
POWER SUPPLY
Operating Range
Maximum Voltage GND to V
Minimum Voltage GND to V
Output Voltage Range
3
With respect to V
S
S
REG
65 V
5 V
2 62.5 V
Supply Current Output low 240 µA
Output high 1.2 mA
TEMPERATURE RANGE FOR SPECIFIED PERFORMANCE −40 +125 °C
1
VOD represents the overdrive voltage, or the amount of voltage by which the threshold point has been exceeded.
2
See the section. Input-Referred Dynamic Error
3
The voltage at OUT must not be allowed to exceed the V
output current is 1 mA, the load resistor must not be more than (5 V – 2.4 V)/{1 mA × (1 + 20%)}, or 2.17 kΩ, to ensure the signal does not exceed 2.6 V. As the supply
increases, the output signal also can be increased, by the same amount.
voltage, which is always 2.4 V less than the supply. For example, when the supply voltage is 5 V and the
REG
±1
±3 mV
Rev. 0 | Page 3 of 16
AD8214
www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
T
= –40°C to +125°C
A
Table 2.
Parameter Rating
Supply Voltage 65 V
Continuous Input Voltage 68 V
Reverse Supply Voltage 0.3 V
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Output Short-Circuit Duration Indefinite
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. 0 | Page 4 of 16
AD8214
www.BDTIC.com/ADI
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1 6 8
1
2
3
Figure 2. Metallization Diagram
5
06193-007
Table 3. Pin Function Descriptions
Pin No. Mnemonic X Y Description
1 V
S
–196 +447 Supply Voltage.
2 +IN –198 –58 Noninverting Input.
3 V
REG
–196 –346 Regulator Voltage.
4 NC No Connect.
5 OUT +196 –348 Output.
6 GND +196 +447 Ground.
7 NC No Connect.
8 –IN –31 +449 Inverting Input.
V
S
AD8214
+IN
2
TOP VIEW
(Not to Scale)
3
V
REG
NC
4
NC = NO CONNECT
Figure 3. Pin Configuration
–IN
8
7
NC
6
GND
5
OUT
06193-002
Rev. 0 | Page 5 of 16
Loading...