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FEATURES 50 mA Voltage Programmable Current Range Three Selectable Gain Ranges 1.7 ns Propagation Delay Inhibit Mode Function High Speed Differential Inputs for Maximum Flexibility Ultrasmall 20-Lead PSOP Package with Built-In Heatsink APPLICATIONS Automatic Test Equipment Semiconductor Test Systems Board Test Systems
GAINA GAINB IOLPGM
High Speed Active Load with Inhibit Mode AD53041
FUNCTIONAL BLOCK DIAGRAM
VOLTAGE-TO-CURRENT CONVERTER
INH
IOLOUT IOLRTN IOHRTN IOHOUT
INH
IOHPGM
AD53041
VOLTAGE-TO-CURRENT CONVERTER
PRODUCT DESCRIPTION
VCOMIN OUT_SENSE VCOM BUFFER GAINA 0 0 1 1 GAINB 0 1 0 1 FULL-SCALE CURRENT 50mA 16mA 5mA NOT VALID VCOMOUT
The AD53041 is a complete, high speed, current switching load designed for use in linear, digital or mixed signal test systems. 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 20-lead, PSOP package with a built-in heatsink. Featuring current programmability of up to 50 mA, the AD53041 is designed to force the device under test to source or sink the programmed IOH and IOL currents. IOH and IOL currents are determined by applying a corresponding voltage (5 V = 50 mA, 16 mA, 5 mA) to the IOHPGM and IOLPGM pins. The voltage-to-current conversion is performed within the AD53041, thus allowing the current levels to be set by a standard voltage out digital-to-analog converter. The AD53041 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 commutation 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 100 nA. The Inhibit input circuitry is implemented using high speed differential inputs with a common-mode voltage range of -2 V to +3 V and a maximum differential voltage of 3 V. This allows for direct interface to precision differential ECL timing or the simplicity of switching active load from a single ended TTL or CMOS logic source. With switching speeds from IOH or IOL into Inhibit of less than 2.0 ns, the AD53041 can be electrically removed from the signal path "on the fly." 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.
The AD53041 is available in a 20-lead, PSOP package with a built-in-heatsink and is specified to operate over the ambient commercial temperature range from -25C to +85C.
INH VCC
AD53041
INH IOHPGM VCOMIN IOLPGM GAINA GAINB AGND IOLOUT 0.1 F 0.1 F
VEE
VCOMOUT OUT_SENSE 0.1 F IOHOUT IOLRTN IOHRTN 1
TO DUT
HSMS-2818 OR EQUIV.
GND
NOT SHOWN: THE AGND PINS ARE THE HIGH QUALITY GROUND REFERENCE FOR THE VOLTAGE-TO-CURRENT CONVERTERS. THE GND PINS PROVIDE RETURN PATHS FOR INTERNAL CURRENTS. VCC IS THE POSITIVE SUPPLY, VEE IS THE NEGATIVE SUPPLY. ALL GROUND PINS SHOULD BE CONNECTED TO THE SYSTEM ANALOG GROUND PLANE.
Figure 1. Typical Application Circuit
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 (c) Analog Devices, Inc., 1998
specifications apply at T = +85 AD53041-SPECIFICATIONS (Allground with a series RC consistingCof a51C. +V = +10.5 Va 0.13%,F-V = -5.2 V 3% unless otherwise specified. V is bypassed to resistor and capacitor,
J S S COMOUT
and is also connected directly to OUT_SENSE. All temperature coefficients are characterized over TJ = 75 C-95 C.)
Parameter INPUT CHARACTERISTICS INH, INH Input Voltage Bias Current GAINA, GAINB Input Voltage Bias Current IOHPGM, IOLPGM Voltage Range IOH, 0 to + Full Scale, Any Gain Range IOL, 0 to - Full Scale, Any Gain Range IOHPGM, IOLPGM Bias Current VCOM BUFFER Voltage Range Offset Offset Drift Nonlinearity Input Bias Current Output Resistance OUTPUT CHARACTERISTICS Full-Scale Current Range Range 0 Range 1 Range 2 Offset Error Range 0 Range 1 Range 2 Offset Drift Range 0 Range 1 Range 2 Gain Error Range 0 Range 1 Range 2 Gain Drift Range 0 Range 1 Range 2 Gain Ratio Drift Range 1 to Range 0 Range 2 to Range 0 Nonlinearity Common-Mode Error PSRR Min Typ Max Units Test Conditions
-2 -1 0 0 -0.1 -0.1 -300 -2
ECL
0 1
V mA V mA V V A V mV mV/C mV A
INH, INH = -2 V, 0 V
TTL/CMOS 5 2 5.2 5.2 300 7
GAINA, GAINB = 5 V V(IOHOUT) = -2 V, 7 V V(IOLOUT) = -2 V, 7 V V(IOHPGM) = +5 V, V(IOLPGM) = 0 V 50 mA Output Current VCOM = 0 V VCOM = 0 V VCOM = -2 V to 7 V VCOM = -2 V to 7 V VCOM = 0 V, IOUT = 50 mA See Functional Block Diagram
5 0.1 5 <1
-50
50
50 16 5 -1 -0.3 -0.3 1 1 1 <1 <5 <8 1 0.5 0.3 0.01 0.01 0.05 0.05 0.1 1 0.3 0.3
mA mA mA mA mA mA A/C A/C A/C % FSR % FSR % FSR A/C A/C A/C %/C %/C % FSR %FSR %FSR/V V(IOHPGM) = V(IOLPGM) = 100 mV, V(IOHOUT) = 2 V, V(IOLOUT) = 2 V V(IOHPGM) = V(IOLPGM) = 100 mV, V(IOHOUT) = V(IOLOUT) = 0 V
Range 0 Range 0 Range 0, V(IOHPGM) = V(IOLPGM) = 100 mV, Either Supply Over Operating Range IOH = 50 mA IOL = 50 mA
OUTPUT VOLTAGE RANGE IOHOUT, IOHRTN IOLOUT, IOLRTN
-2.5 -2.5
7.5 7.5
V V
-2-
REV. A
AD53041
Parameter LEAKAGE CURRENTS IOH Inhibit-Mode Leakage IOL Inhibit-Mode Leakage IOH Off-State Leakage IOL Off-State Leakage DYNAMIC PERFORMANCE Propagation Delays IMAX to Inhibit Part-to-Part Skew Inhibit to IMAX Part-to-Part Skew Propagation Delay Drift Capacitance POWER SUPPLIES -VS to +VS Range Positive Supply Range Negative Supply Range Positive Supply Current 15.2 10.2 -5.4 Min -1 -1 -3 -3 Typ Max 1 1 3 3 Units A A A A Test Conditions Range 0, Bridge Diode Leakage Not Included V(IOHOUT) = -2.5 V to 7.5 V, Inhibited V(IOLOUT) = -2.5 V to 7.5 V, Inhibited V(IOHOUT) = -2.5 V to 7.5 V, V(IOHPGM) = -0.2 V V(IOLOUT) = -2.5 V to 7.5 V, V(IOLPGM) = -0.2 V
1.4 1 1.9 1 10 3 15.7 10.5 -5.2 16.2 10.8 -5.0 160 60 160 10 60 2.1 2.3
ns ns ns ns ps/C pF V V V mA mA mA mA W
Range 0, IMAX, RLOAD = 50 Range 0, IMAX, RLOAD = 50 IMAX to Inhibit, Inhibit to IMAX IOHOUT or IOLOUT Without Diodes
10 Negative Supply Current
Power Dissipation
NOTES Typical values are not tested or guaranteed. Specifications subject to change without notice.
Range 0, V(IOHPGM) = V(IOLPGM) = 5.0 V, Active Range 0, V(IOHPGM) = V(IOLPGM) = 200 mV, Active Range 0, V(IOHPGM) = V(IOLPGM) = 5.0 V, Active Range 0, V(IOHPGM) = V(IOLPGM) = 200 mV, Active IOH = 50 mA, IOL = -50 mA, Active, V(IOHOUT) = 7 V, V(IOLOUT) = -2 V
Table I. Active Load Truth Table (Including External Diode Bridge per Figure 1; Scale Factors per Functional Block Diagram)
V(DUT) < VCOM > VCOM X
INH 0 0 1
INH 1 1 0
OUTPUT STATES (IFS Is Full-Scale Current Set by GAINA, GAINB) IOH IOL I(VDUT) [V(IOHPGM) / 5 V] x IFS [V(IOHPGM) / 5 V] x IFS 0 [V(IOLPGM) / 5 V] x IFS [V(IOLPGM) / 5 V] x IFS 0 IOL IOH 0
VDUT
tpdAH tpdIH
Vact- Vact+
PROPAGATION DELAY LOAD AND TEST CONDITIONS
PARAMETER DESCRIPTION IOL Inh Act IOL Act Inh IOH Inh Act IOH Act Inh IOL 50mA 50mA 50mA 50mA IOH 50mA 50mA 50mA 50mA VDUT 0V 0V 5V 5V MEASURE POINT 0.50V 2.00V 4.50V 3.00V
tpdIL tpdAL
VDUT ECL+ ECL-
tpdAH tpdIL tpdAH tpdIH
Figure 2. Inhibit Propagation Delay Measurement
REV. A
-3-
AD53041
ABSOLUTE MAXIMUM RATINGS 1 PIN CONFIGURATION
DIMPLE ON BOTTOM OF PACKAGE AGND 1 IOLPGM 2 IOLOUT 3 IOLRTN 4 VCOMIN 5 20 GAINB 19 GAINA
Power Supply Voltage +VS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +12 V -VS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 V +VS to -VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +17 V GND to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 V Inputs INH, INH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6 V, -3 V INH to INH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 V GAINA, GAINB . . . . . . . . . . . . . . . . . . . . . . . . +6 V, -3 V GAINA to GAINB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V VCOMIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8 V, -3 V IOHPGM, IOLPGM . . . . . . . . . . . . . . . . . . . . . . . . . +6 V, -1 V Outputs IOHOUT, IOHRTN . . . . . . . . . . . . . . . . . . . . . . . . +9 V, -2.5 V IOLOUT, IOLRTN . . . . . . . . . . . . . . . . . . . . . . . . . +8 V, -3.5 V VCOMOUT Short Circuit Duration . . . . . . . . . Not Protected2 Environmental Operating Temperature (Junction) . . . . . . . . . . . . . . +175C Storage Temperature . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 sec)3 . . . . . . . . . . +260C
NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause per manent 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. Absolute maximum limits apply individually, not in combination. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 Short circuit to ground or to either supply will result in the destruction of the device. 3 To ensure lead coplanarity ( 0.002 inches) and solderability, handling with bare hands should be avoided and the device should be stored in environments at 24 C 5C (75F 10F) with relative humidity not to exceed 65%.
17 VCC
AD53041
TOP VIEW VCOMOUT 6 (Not to Scale) 15 INH IOHRTN 7 IOHOUT 8 DGND 9 DGND 10 14 VEE 13 DGND 12 AGND 11 IOHPGM
16 INH
NOTES: AGND IS THE HIGH-QUALITY GROUND REFERENCE FOR IOLPGM AND IOHPGM. DGND IS THE SUPPLY GROUND.
PACKAGE THERMAL CHARACTERISTICS
Air Flow, FM 0 50 400 4 4 4
JC,
C/W
JA,
C/W
50 49 34
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
20-Lead Thermally Enhanced Power Small Outline Package (PSOP) (RP-20)
0.5118 (13.00) 0.4961 (12.60)
20 11
ORDERING GUIDE
Shipment Method, Quantity per Shipping Package Container Option RP-20
Model
Package Description
0.2992 (7.60) 0.2914 (7.40)
1
HEAT SINK
10
0.1890 (4.80) 0.4193 (10.65) 0.1791 (4.55) 0.3937 (10.00)
AD53041KRP 20-Lead Power SOIC Tube, 38 Pieces
PIN 1 0.3340 (8.61) 0.3287 (8.35) 0.1043 (2.65) 0.0926 (2.35) 8 0 0.0118 (0.30) 0.0500 (1.27) 0.0040 (0.10) BSC STANDOFF 0.0201 (0.51) SEATING 0.0500 (1.27) 0.0130 (0.33) PLANE 0.0057 (0.40) 0.0295 (0.75) x 45 0.0098 (0.25)
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 AD53041 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.
WARNING!
ESD SENSITIVE DEVICE
-4-
REV. A
PRINTED IN U.S.A.
C3004a-0-11/98
18 DGND

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