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AD1315 の電気的特性と機能

AD1315のメーカーはAnalog Devicesです、この部品の機能は「High Speed Active Load with Inhibit Mode」です。


製品の詳細 ( Datasheet PDF )

部品番号 AD1315
部品説明 High Speed Active Load with Inhibit Mode
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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AD1315 Datasheet, AD1315 PDF,ピン配置, 機能
a
FEATURES
+50 mA Voltage Programmable Current Range
1.5 ns Propagation Delay
Inhibit Mode Function
High Speed Differential Inputs for Maximum Flexibility
Hermetically Sealed Small Gull Wing Package
Compatible with AD1321, AD1324 Pin Drivers
APPLICATIONS
Automatic Test Equipment
Semiconductor Test System
Board Level Test System
High Speed Active Load
with Inhibit Mode
AD1315
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
The AD1315 is a complete, high speed, current switching load
designed for use in linear, digital or mixed signal test systems.
By combining a high speed monolithic process with a unique
surface mount package, this product attains superb electrical
performance while preserving optimum packaging densities in
an ultrasmall 16-lead, hermetically sealed gull wing package.
Featuring current programmability of up to +50 mA, the
AD1315 is designed to force the device under test to source or
sink the programmed IOHPROG and IOLPROG currents. The IOH
and IOL currents are determined by applying a corresponding
voltage (5 V = 50 mA) to the IOH and IOL pins. The voltage-
to-current conversion is performed within the AD1315 thus
allowing the current levels to be set by a standard voltage out
digital-to-analog converter.
The AD1315’s transition from IOH to IOL occurs when the
output voltage of the device under test slews above or below the
programmed threshold, or commutation voltage. The commuta-
tion voltage is programmable from 2 V to +7 V, covering the
large spectrum of logic devices while able to support the large
current specifications (48 mA) typically associated with line
drivers. To test I/O devices, the active load can be switched into
a high impedance state (Inhibit mode) electrically removing the
active load from the path through the Inhibit mode feature. The
active load leakage current in Inhibit is typically 20 nA.
The Inhibit input circuitry is implemented utilizing high speed
differential inputs with a common-mode voltage range of 7 volts
and a maximum differential voltage of 4 volts. This allows for
the direct interface to the precision of differential ECL timing or
the simplicity of switching the Active Load from a single ended
TTL or CMOS logic source. With switching speeds from IOH
or Io~ into Inhibit of less than 1.5 ns, the AD1315 can be
electrically removed from the signal path “on-the-fly.”
The AD1315 is available in a 16-lead, hermetically sealed gull
wing package and is specified to operate over the ambient com-
mercial temperature range from 0°C to +70°C.
REV. A
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: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997

1 Page





AD1315 pdf, ピン配列
ABSOLUTE MAXIMUM RATINGS1
Power Supply Voltage
+VS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +12 V
–VS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –11 V
Difference from +VS to –VS . . . . . . . . . . . . . . . . . . . . . 16 V
Inputs
Difference from INH to INH . . . . . . . . . . . . . . . . . . . . . 5 V
INH, INH . . . . . . . . . . . . . . . . . . +VS – 13.4 V, –VS + 11 V
VCOM, VDUT . . . . . . . . . . . . . . . +VS – 13.1 V, –VS + 13.2 V
IOL, IOH Program Voltage . . . . . . . . +VS – 15 V, –VS + 15 V
Operating Temperature Range . . . . . . . . . . . . . . . 0 to +70°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +125°C
Lead Temperature Range (Soldering 20 sec)2 . . . . . . . +300°C
Pin
No. Symbol
Function
1 IOLRTN Logic Low Current Return
2 VCOM
Communication Voltage
3 VDUT
Load/Dot Connection
4 –VS
Negative Supply
5 IOHRTN Logic High Current Return
6
IOLPROG
Logic Low Current Program Voltage
7 LID
Lid Connection (Internal)
8 GND
Ground
9
IOHPROG
Logic High Current Program Voltage
10 N/C
No Connection
11 N/C
No Connection
12 N/C
No Connection
13 +VS
14 INH
15 INH
Positive Supply
Inhibit
Inhibit
16 N/C
No Connection
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2To ensure lead coplanarity (± 0.002 inches) and solderability, handling with bare
hands should be avoided and the device should be stored in an environment at
24°C, ± 5°C (75°F, ± 10°F) with relative humidity not to exceed 65%.
AD1315
CONNECTION DIAGRAM
SUGGESTED PAD LOCATION
Dimensions shown in inches and (mm).
ORDERING GUIDE
Model
Temperature Package
Range
Description
Package
Option*
AD1315KZ 0 to +70°C
16-Lead Gull Wing Z-16B
*Z = Leaded Chip Carrier (Ceramic).
REV. A
–3–


3Pages


AD1315 電子部品, 半導体
AD1315
FUNCTIONAL DESCRIPTION
The AD1315 is a complete high speed active load designed for
use in general purpose instrumentation and digital functional
test equipment. The function of the active load is to provide
independently variable source and sink currents for the device to
be tested.
The equivalent circuit for the AD1315 is shown in Figure 11.
An active load performs the function of loading the output of
the device under test with a programmed IOH or IOL. These
currents are independently programmable. VCOM is the commu-
tation voltage point at which the load switches from source to
sink mode. The active load may also be inhibited, steering cur-
rent to the IOLRTN and IOHRTN pins, effectively disconnecting it
from the test pin.
The AD1315 accepts differential digital signals at its inhibit
inputs ensuring precise timing control and high noise immunity.
The wide inhibit input voltage range allows for ECL power
supplies of –5.2 V and 0 V, –3.2 V and +2 V, and 0 V and +5 V.
Where speed and timing accuracy are less important, TTL or
CMOS logic levels may be used to toggle the Inhibit inputs of
the AD1315. Single ended operation is possible by biasing one
of the inputs to approximately +1.3 V for TTL or VCC/2 for
CMOS. Care should be taken to observe the 4 V maximum
allowable input voltage.
The IOH and IOL programming inputs accept 0 V to +5 V analog
inputs, corresponding to 0 to 50 mA output currents. The VCOM
input, which sets the IOH/IOL switch point, may be set anywhere
within the input range of –2 V to +7 V.
Figure 11. Block Diagram
Figure 12. Allowable Current Range for IOH, IOL vs. VDUT
Ideally, the commutation point set at VCOM would provide in-
stantaneous current sink/source switching. Because of I/V
characteristics of the internal bridge diodes, this is not the case.
To guarantee full current switching at the DUT, at least a 1 volt
difference between VCOM and VDUT must be maintained in
steady state conditions. Because of the relatively fast edge rates
exhibited by typical logic device outputs, this should not be a
problem in normal ATE applications.
INHIBIT MODE LEAKAGE
The AD1315’s inhibit-mode leakage current changes with both
temperature and bias levels. There are two major contributing
effects: transistor reverse-bias collector-base leakage and reverse
leakage in the Schottky-diode bridge. Leakage variations with
VDUT arise primarily from transistor collector-base leakage,
while both effects contribute to leakage current temperature
variations. Inhibit-mode leakage is weakly dependent on VCOM
and decreases slightly as the difference between VDUT and VCOM
is reduced. Figure 8 shows typical AD1315 inhibit leakage cur-
rent as a function of VDUT and temperature.
THERMAL CONSIDERATIONS
The AD1315 is provided in a 0.550" ϫ 0.550", 16-lead (bottom
brazed) gull wing, surface mount package with a θJC of 10°C/W
(typ). Thermal resistance (case-to-ambient) vs. air flow for the
AD1315 in this package is shown in Figure 13. The data pre-
sented is for a ZIF socketed device. For PCB mounted devices
(w/30 mils clearance) the thermal resistance should be ~3 to 7%
lower with air flows below 320 lfm(1). Notice that the improve-
ment in thermal resistance vs. air flow starts to flatten out just
above 400 lfm(2).
NOTES
1Ifm is air flow in linear feet/minute.
2For convection cooled systems, the minimum recommended airflow is 400 lfm.
VDUT VOLTAGE RANGE
In Figure 12, VDUT range, IOH and IOL typical current maxi-
mums are plotted versus DUT voltage. In the IOH mode (VDUT
higher than VCOM), the load will sink 50 mA, until its output
starts to saturate at approximately –1.5 V. In the IOL mode
(VDUT lower than VCOM), the load will source 50 mA until its
output starts to saturate at approximately +5.5 V. At +7 V, the
source current will be close to zero.
Figure 13. Case-to-Ambient Thermal Resistance vs.
Air Flow
–6– REV. A

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共有リンク

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