ANALOG DEVICES AD1315 Service Manual

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High Speed Active Load

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

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 I
and IOL currents are determined by applying a corresponding
voltage (5 V = 50 mA) to the I
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-

OHPROG

and I

and IOL pins. The voltage-

OH

currents. The I

OLPROG

OH

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 com­mercial 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: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1997

(All measurements made in free air at +258C. +VS = +10 V, –VS = –5.2 V, unless

AD1315–SPECIFICATIONS

otherwise noted.)

AD1315KZ

Parameter Min Typ Max Units Comments

DIFFERENTIAL INPUT CHARACTERISTICS

INH to INH

Input Voltage, Any One Input –3.0 4.0 Volts
Differential Input Range 0.4 ECL 4.0 Volts
Bias Current –2.0 1.0 2.0 mA

Current Program Voltage Range

I

, 0 mA to +50 mA (Sink)

OH

I

, 0 mA to –50 mA (Source)

OL

Input Resistance 50 kΩ

I

, I

OHRTN

V

OCRTN

, V

COM

I

OH

Range –2.0 +7.0 Volts

DUT

, 0 mA to +50 mA 0.5 +7.0 Volts V

Range

2

IOL, 0 mA to –50 mA –2.0 +4.0 Volts V

OUTPUT CHARACTERISTICS

1

1

0 +5.0 Volts
0 +5.0 Volts

–2.0 +7.0 Volts

– V

DUT
COM

3

– V

COM

DUT

Active (Sink/Source) Mode

Transfer Function 10 mA/V See Figure 1
Accuracy See Figure 1

Linearity Error –0.12 +0.12 % FSR
Gain Error –2.0 +2.0 % FSR
Offset Error –1.0 +1.0 mA

Output Current TC 10 µA/°C

Inhibit Mode

Output Capacitance 3.0 pF
Inhibit Leakage –200 20 200 nA

(t

PD1
PD2

3

4

)

4

)

0.5 1.5 ns

1.5 3.0 ns

DYNAMIC PERFORMANCE

Propagation Delay See Figure 2

±I

to INHIBIT (t

MAX

INHIBIT to ±I

MAX

POWER SUPPLIES

to +VS Difference 15.2 15.4 Volts

–V

S

Supply Range

Positive Supply +9.5 +10 +10.5 Volts
Negative Supply –5.45 –5.2 –4.95 Volts

Current

Positive Supply
Negative Supply

Power Dissipation

7

PSRR

NOTES

1

I

OHPROG/IOLPROG

2

I

OHRTN/IOLRTN

3

V

DUT

4

Measured from the ECL crossing to the 10% change in the output current.

5

I

PROGRAM

6

Maximum power dissipation with +VS = +10 V, –VS = 5.2 V, I

7

For a 1% change in +VS or VS, the output current may change a maximum of 0.05% of Full Scale Range (FSR).

Specifications subject to change without notice.

should be connected to V

= –2 V to +7 V, C

= ±50 mA.

5

5

6

voltage range may be extended to –100 mV due to a possible 1 mA offset current.

= 10 pF, R

TOTAL

to minimize power dissipation.

COM

= 10 Ω. For inhibit leakage tests, V

DUT

PROGRAM

5

+70

5

–100

50 mA, V

+85 +100 mA
–85 –70 mA

1.3 1.54

= 0 V to +5.9 V, IOH = –4 mA, IOL = +4 mA, T

DUT

= V

DUT

= 0 V.

COM

0.05 %/%

CASE

= +36°C.

>1 V
>1 V

–2–

REV. A

AD1315

ABSOLUTE MAXIMUM RATINGS

1

Power Supply Voltage

+V

to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +12 V

S

–V

to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –11 V

S

Difference from +V

to –VS . . . . . . . . . . . . . . . . . . . . . 16 V

S

Inputs

Difference from INH to INH . . . . . . . . . . . . . . . . . . . . . 5 V

INH, INH . . . . . . . . . . . . . . . . . . +V

V

, V

COM

I

, IOH Program Voltage . . . . . . . . +VS – 15 V, –VS + 15 V

OL

. . . . . . . . . . . . . . . +VS – 13.1 V, –VS + 13.2 V

DUT

– 13.4 V, –VS + 11 V

S

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

1I
2V
3V
4–V
5I
6I

OLRTN

COM
DUT

S
OHRTN
OLPROG

Logic Low Current Return
Communication Voltage
Load/Dot Connection
Negative Supply
Logic High Current Return

Logic Low Current Program Voltage
7 LID Lid Connection (Internal)
8 GND Ground
9I

OHPROG

Logic High Current Program Voltage
10 N/C No Connection
11 N/C No Connection
12 N/C No Connection
13 +V

S

Positive Supply
14 INH Inhibit
15 INH Inhibit
16 N/C No Connection

1

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
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

2

To 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%.

CONNECTION DIAGRAM

SUGGESTED PAD LOCATION

Dimensions shown in inches and (mm).

ORDERING GUIDE

Temperature Package Package

Model Range Description Option*

AD1315KZ 0 to +70°C 16-Lead Gull Wing Z-16B

*Z = Leaded Chip Carrier (Ceramic).

REV. A

–3–