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a
FEATURES Four Delay Lines with the Ability to Independently Adjust All Edges Pin Compatible and Functionally Equivalent with the BT624 Reduced Power Dissipation 44-Lead PLCC Package with Internal Heat Spreader APPLICATIONS Automatic Test Equipment Semiconductor Test Systems Board Test Systems Clocked ECL Circuits
Four Channel ECL Delay Line AD53020
FUNCTIONAL BLOCK DIAGRAM
GND S0 S1 VWIDTH1 OUT1 OUT1 VDELAY1 VWIDTH2 IN2, IN2 OUT2 OUT2 DRVMODE VDELAY2 VWIDTH3 IN3, IN3 OUT3 OUT3
AD53020
IN1, IN1
PRODUCT DESCRIPTION
The AD53020 is a four-channel delay line designed for use in automatic test equipment and digital logic systems. High speed bipolar transistors and a 44-lead plastic PLCC package with internal heat spreader provide high frequency performance at a minimum of space, cost and power dissipation. Featuring full pin compatibility and functional equivalence to the BT624, the AD53020 offers independent analog control of positive and negative edges with five delay ranges. The AD53020 offers attractive performance with optimized power dissipation and linear delay vs. program voltage control. This device is also very stable over operating conditions and has very low jitter. Digital inputs are ECL compatible. They can either be provided independently for each channel (IN1, IN1 through IN4, IN4), or fanned out to all channels from Channel 2 (IN2, IN2). The choice of these two options is made by setting the DRVMODE input, with ECL Logic 0 providing four independent channels, and ECL Logic 1 enabling a logical OR function between each channel and the Channel Number 2. For maximum timing accuracy, differential signals are recommended for use with the digital inputs. However, single-ended operation is also supported and it is facilitated through the use of the VBB midpoint level generated on-chip. To make use of this feature, connect the VBB output to the inverting input of each channel. It is also advisable, when using the VBB output, to decouple this signal with a 0.1 F ceramic capacitor to ground. The outputs of the AD53020 are ECL compatible and should be terminated by 50 to -2.0 V at the inputs of the gates they drive.
VDELAY3 VWIDTH4 IN4, IN4 OUT4 OUT4 VEE VBB COMP1 COMP2 REXT1 REXT2 VDELAY4
The delay is programmed through the VDELAY and VWIDTH pins for each channel. The acceptable range is -1.3 V to -0.1 V, representing the longest and the shortest delays provided by the device. An 0.01 F ceramic capacitor to ground is recommended for each input. The bias current for each input is fixed by an internal current mirror. The value of the bias current is set by the external resistor at REXT1. A 1.3 k resistor to ground at this pin establishes 1 mA bias in each input. The nominal voltage at the REXT1 pin is -1.3 V. The VDELAY affects both the positive and negative edges in all modes. The VWIDTH is an additional delay adjustment that is active in Modes 2, 3 and 5. VWIDTH has no effect in Modes 0 and 1. For Modes 2 and 3, the effect of the VWIDTH adjustment is to increase or decrease the delay of the negative edge relative to the positive edge. In Mode 5, the total delay for both positive and negative edges is set by the combination of VDELAY and VWIDTH.
(continued on page 4)
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: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 1999
AD53020-SPECIFICATIONS AD53020-Test Conditions=(Unless otherwise=noted): Recommended Operating on Conditions with all OUT and OUT outputs terminated through 50 to -2.0 V, REXT1 1.3 k , REXT2 2.94 k . Typical values are based
nominal temperature, TA = +25 C, and nominal supply voltage, VEE = -5.2 V.
DC CHARACTERISTICS1
Parameter DIGITAL INPUT HIGH VOLTAGE IN, IN, DRVMODE, S0, S1 DIGITAL INPUT LOW VOLTAGE IN, IN, DRVMODE, S0 DIGITAL INPUT LOW VOLTAGE, S1 S1 THIRD STATE (EXTENDED DELAY) DIGITAL OUTPUT HIGH VOLTAGE DIGITAL OUTPUT LOW VOLTAGE DIGITAL INPUT BIAS CURRENT IN, IN, DRVMODE, S0, S1 POWER SUPPLY REJECTION RATIO VEE SUPPLY CURRENT Mode 0 Modes 1, 2 Modes 3, 5
2
Symbol VIH VIL VIL VOH VOL IIN PSRR IEE IEE IEE
T( C) 70 70 70 Full 70 70
Min -1.070 -1.950 VEE VEE -1.000 -1.950
Typ
Max 0.000 -1.450 -1.450 -3.2 -0.735 -1.600
Units V V V V V V A % Tpd/V
-100 to +100 Full Full Full Full 0.5 174 225 267 200 250 290
mA mA mA
NOTES 1The specified limits shown can be met only after thermal equilibrium has been established. Thermal equilibrium is established by applying power for at least two minutes while maintaining a transverse air flow of 400 linear feet per minute over the device either mounted in the test socket or on the printed circuit board. 2This parameter is fully characterized, but not production tested. Specifications subject to change without notice.
AC CHARACTERISTICS1
Parameter MINIMUM PROPAGATION DELAYS2 Mode S1 S0 VDELAY 0 0 0 -0.1 V 1 0 1 -0.1 V 2 1 0 -0.1 V 3 1 1 -0.1 V 5 VEE 1 -0.1 V DELAY ADJUSTMENT RANGES Mode S1 S0 0 0 0 1 0 1 2 1 0 3 1 1 5 VEE 1 MINIMUM PULSEWIDTH3 RISING EDGE DELAY VS. VWIDTH DELAY Change (Modes 2 and 3)3 DELAY VS. DUTY CYCLE
3, 4
Symbol
Min
Typ
Max
Units
Tpd Min Tpd Min Tpd Min Tpd Min Tpd Min
3.6 4.9 3.9 5.2 6.8
4.5 6.3 5.3 7.1 8.8
5.4 7.3 6.8 8.8 10.3
ns ns ns ns ns
Tpd Span Tpd Span Tpd Span Tpd Span Tpd Span
14.0 22.9 13.2 22.0 29.3
19.0 31.4 18.9 31.5 44.5 1.9 30 50
24.7 37.8 24.6 40.6 52.0
ns ns ns ns ns ns ps ps
VWIDTH RANGE OF ADJUSTMENT (VDELAY = -0.6 V, MODES 2 AND 3, DELAY RELATIVE TO VWIDTH = -0.7 V) VWIDTH = -0.1 V VWIDTH = -1.1 V VWIDTH = -1.3 V
+4.0
-5.5 +5.5 +6.5
-4.0
ns ns ns
-2-
REV. A
AD53020
Parameter RISING TO FALLING EDGE DELAY MATCHING (VDELAY = VFALL = -0.5 V)3 Modes 0, 1, 5 Modes 2, 3 PROPAGATION DELAY TEMPERATURE COEFFICIENT3, 5 OUTPUT RISE/FALL TIMES (20% to 80%)3 DELAY LINEARITY
3
Symbol
Min
Typ
Max
Units
0.1 1.0 0.05 550 MONOTONIC
ns ns % Tpd/C ps
NOTES 1 The specified limits shown can be met only after thermal equilibrium has been established. Thermal equilibrium is established by applying power for at least two minutes while maintaining a transverse air flow of 400 linear feet per minute over the device either mounted in the test socket or on the printed circuit board. 2 All minimum propagation delay time measurements refer to both rising and falling edges for Modes 0, 1, 5; these measurements refer to rising edges for Modes 2 and 3 only. DRVMODE is logically low. 3 This parameter is fully characterized, but not production tested. 4 Delay on leading and trailing edges are measured by setting VDELAY = VWIDTH = -0.7 V. The variations for each delay are measured by changing the input duty cycle from 5% to 95% at a constant frequency of 10 MHz. 5 Propagation delay temperature coefficient measured at VDELAY = VWIDTH = -0.7 V. Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS 1 Parameter VEE (Relative to GND) Voltage on Any Digital Pin Output Current Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature2 (Soldering, 5 sec) Symbol Min -6.0 VEE TA TS TJ TSOL -55 -65 Max 0 50 +70 +150 +150 Units V V mA C C C
ORDERING GUIDE
Model AD53020
Package Description 44-Lead Plastic Leaded Chip Carrier (PLCC)
PIN CONFIGURATION
GND4 GND3 GND2 VEE2 VEE3 VEE1
Package Option P-44A
IN3
IN3
IN4
NOTES 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 listed 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 of time may affect device reliability. 2 To ensure lead solderability, handling with bare hands should be avoided and the device should be stored in environments at 24C 5C (75F 10F) with relative humidity not to exceed 65%.
6 IN4 7 VEE4 8 VDELAY4 9 VWIDTH4 10 VDELAY3 11 VWIDTH3 12 VDELAY2 13 VWIDTH2 14 VDELAY1 15 VWIDTH1 16 VBB 17
5
4
3
2
1
44 43 42 41 40
PIN 1 IDENTIFIER
IN2
IN2
+260 C
39 IN1 38 IN1 37 GND1 36 COMP1
AD53020
TOP VIEW (Not to Scale)
35 REXT1 34 COMP2 33 REXT2 32 DRVMODE 31 S0 30 S1 29 GND1
18 19 20 21 22 23 24 25 26 27 28 OUT4 OUT3 OUT3 OUT4 OUT2 OUT1 GND4 GND3 GND2 OUT2 OUT1
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 AD53020 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
REV. A
-3-
AD53020
A second bias current reference is employed to set the bias current of the delay cells. This current is set by the external resistor at REXT2. A 2.94 k resistor sets the nominal bias current of 500 A. The nominal voltage at the REXT2 pin is -1.47 V. The current references require compensation capacitors of 0.1 F to VEE at each of the COMP1 and COMP2 pins. In addition, each VEE supply pin should also have its own decoupling capacitor of 0.1 F to ground. All decoupling capacitors should be located as close as possible to the AD53020 chip. The mode is set by the inputs S0 and S1. These pins use standard ECL levels, with the addition of a third level for the S1 Pin, which can also be connected to VEE. Refer to Table I for the description of the modes and their respective settings. For Modes 2 and 3, it is important to note that an internal flipflop is used to provide the independent control of rising and falling edges. The state of this flip-flop is indeterminate upon power-up. The state becomes fixed once the first full pulse is provided to each channel, consisting of a positive edge followed by a negative edge.
Table I. Truth Table for Mode Determination
S1 0 0 1 1 VEE VEE
S0 0 1 0 1 0 1
Mode 0 1 2 3 Not Valid 5
Typical Independent Adjustment of Span Positive and Negative Edges? 19 ns 31 ns 19 ns 31 ns 45 ns No No Yes Yes No
S0 and S1 accept logical ECL levels. In the case of S1 only, a third state is also accepted, at the negative supply, V EE.
Table II. Package Thermal Characteristics
Air Flow, FM 0 400
JA,
C/W
30.2 20.9
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
44-Lead PLCC (P-44A)
0.180 (4.57) 0.165 (4.19) 0.048 (1.21) 0.042 (1.07) 0.048 (1.21) 0.042 (1.07)
6 7 PIN 1 IDENTIFIER
0.056 (1.42) 0.042 (1.07)
40 39
0.025 (0.63) 0.015 (0.38) 0.050 (1.27) BSC
0.63 (16.00) 0.59 (14.99)
TOP VIEW
(PINS DOWN)
0.021 (0.53) 0.013 (0.33) 0.032 (0.81) 0.026 (0.66) 0.040 (1.01) 0.025 (0.64) 0.110 (2.79) 0.085 (2.16)
17 18
29 28
0.020 (0.50) R
0.656 (16.66) SQ 0.650 (16.51) 0.695 (17.65) SQ 0.685 (17.40)
-4-
REV. A
PRINTED IN U.S.A.
C3265a-0-2/99

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