ANALOG DEVICES AD1317 Service Manual

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Ultrahigh Speed

a

FEATURES
Full Window Comparator

2.0 pF max Input Capacitance
9 V max Differential Input Voltage

2.5 ns Propagation Delays
Low Dispersion
Low Input Bias Current
Independent Latch Function
Input Inhibit Mode
80 dB CMRR

APPLICATIONS
High Speed Pin Electronic Receiver
High Speed Triggers
Threshold Detectors
Peak Detectors

PRODUCT DESCRIPTION

The AD1317 is an ultrahigh speed window comparator with a
latch. It uses a high speed monolithic process to provide high dc
accuracy without sacrificing input voltage range. The AD1317
guarantees a 2.8 ns maximum propagation delay.

On-chip connection of the common input eliminates the contri­butions of a second bonding pad and package pin to the input
capacitance, resulting in a maximum input capacitance of 2 pF.

The dispersion, or variation in propagation delay with input
overdrive levels and slew rates, is typically 350 ps for 5 V signals
and 200 ps for 1 V inputs.

The AD1317 employs a high precision differential input stage
with a common-mode range of 9 V. Its complementary digital

Window Comparator with Latch

AD1317

FUNCTIONAL BLOCK DIAGRAM

outputs are ECL compatible. The output stage is capable of

driving a 50 Ω line terminated to –2 V. The AD1317 also pro-

vides a latch function, allowing operation in a sample-hold
mode. The latch inputs can also be used to generate hysteresis.

The comparator input can be switched into a high impedance
state through the inhibit mode feature, electrically removing the
comparator from the circuit. The bias current in inhibit mode is
typically 50 pA.

The AD1317 is available in a small 16-lead, hermetically sealed
“gull-wing” surface mount package and operates over the com-

mercial temperature range, 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 specifications at +258C, free air. Outputs terminated into 50 V to –2 V,

AD1317–SPECIFICATIONS

Parameter Symbol Min Typ Max Units Comments

DC INPUT CHARACTERISTICS

Offset Voltage V
Offset Drift dV
VINA/B Bias Currents –2 V to +7 V

Active Ibca 10 33 µA

Inhibit Ibci 50 pA

VINA, VINB Bias Currents –2 V to +7 V

Active Ibsa 5 16.5 µA

Inhibit Ibsi 50 pA

VINA/B Resistance Rinc 4 MΩ
VINA, VINB Resistance Rins 8 MΩ

Capacitance VINA/B, VINA, VINB C
Voltage Range V
Differential Voltage V
Common-Mode Rejection Ratio CMRR 70 80 dB –2 V to +7 V

LATCH ENABLE INPUTS

Input Voltage, Any Input –2.0 5.0 Volts
Differential Voltage 0.4 4 Volts
Logic “1” Current I
Logic “0” Current I
Capacitance 4 pF

INPUT ENABLE CURRENTS

Input Voltage, Any Input –2.0 5.0 Volts
Differential Voltage 0.4 4 Volts
Logic “1” Current I
Logic “0” Current I
Capacitance 4 pF

DIGITAL OUTPUTS

Logic “l” Voltage V
Logic “0” Voltage V

SWITCHING PERFORMANCE See Figure 3

Propagation Delays

Input to Output t
Latch Enable to Output t
Active to Inhibit t
Inhibit to Active t

Propagation Delay T.C. 5 ps/°C

Dispersion See Note 4

5 V Signal See Figure 1

All Edges 450 600 ps
Rising Edge 350 ps
Falling Edge 350 ps

1 V Signal See Figure 2

All Edges 250 400 ps
Rising Edge 200 ps
Falling Edge 200 ps

LATCH TIMING

Input Pulse Width t
Setup Time t
Hold Time t

POWER SUPPLIES

to +VS Range 15.2 15.6 See Note 5

–V

S

Positive Supply +V
Negative Supply –V
Positive Supply Current I+ 50 70 mA
Negative Supply Current I– –100 –70 mA

PSRR 65 75 dB Measured at ±2.5% of +V

NOTES

1

P

ropagation Delay is measured from the input threshold crossing at the 50% point of a 0 V to 5 V input to the output Q and Q crossing.

2

Propagation Delay is measured from the input crossing of IE and IE to when the input bias currents drop to 10% of their nominal value.

3

Propagation Delay is measured from the input crossing of IE and IE to when the input bias currents rise to 90% of their nominal value.

4

Dispersion is measured with input slew rates of 0.5 V/ns and 2.5 V/ns for 5 V swings, 0.5 V/ns and 1 V/ns for 1 V swings.

5

The comparator input voltage range is specified for –2 V to +7 V for typical power supply values of -5.2 V and +10.0 V but can be offset for different input ranges such as –1 V to
+8 V with power supplies of –4.2 V and +11 V, as long as the required headroom of 3 V is maintained between both V

Specifications subject to change without notice.

OS

/dT 20 µV/°C

OS

IN

CM

DIFF

IH

IL

IH

IL

OH

OL

, t

PDR

LO

IN

IE

PW

S

H

S

S

with + VS = +10 V, –VS = 5.2 V unless otherwise noted)

AD1317KZ

–10 10 mV CMV = 0 V

–2 7 Volts See Note 5

–200 µA

–200 µA

–0.98 Volts

PDF

2.5 1.0 ns

1.5 0.4 ns
0ns

8.0 10.0 11.0 Volts
–7.2 –5.2 –4.2 Volts

1.5 2.0 pF

9 Volts

10 µA

20 µA

–1.50 Volts

1.8 2.8 ns See Note 1

2.0 2.5 ns See Note 1

2.5 ns See Note 2
15 ns See Note 3

and +VS and VL and +VS.

H

and –V

S

S

–2–

REV. A

AD1317

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

1

Power Supply Voltage

+V

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

S

–V

to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –9 V

S

Difference from +V

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

S

Inputs

VINA/B, VINA, VINB . . . . . . . +V

LEA, LEA, LEB, LEB . . . . . . . . . . +V

IE, IE . . . . . . . . . . . . . . . . . . . . . . +V

Outputs

2

– 13.5 V, –VS + 13.7 V

S

– 14 V, –VS + 12 V

S

– 14 V, –VS + 10.3 V

S

QA, QA, QB, QB . . . . . . . . . . GND – 0.5 V, GND + 3.5 V

Operating Temperature Range . . . . . . . . . . . . . 0°C to +70°C

Storage Temperature Range

After Soldering . . . . . . . . . . . . . . . . . . . . . –65°C to + 125°C

Lead Temperature Range (Soldering 20 sec)

NOTES

1

Stresses above those limits 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

Limits apply for shorted output.

3

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%.

3

. . . . . . .+300°C

ORDERING GUIDE

WINDOW COMPARATOR PIN ASSIGNMENT

Pin No. Description

1 VINA Noninverting Comparator A Input
2 VINA/B Window Comparator Common Input
3 VINB Inverting Comparator B Input
4 IE Input Enable
5 IE Input Enable
6–V

S

Negative Supply, –5.2V
7 GND Ground
8+V

S

Positive Supply, +10 V
9 LEB Latch Enable B
10 LEB Latch Enable B
11 QB Comparator B Output
12 QB Comparator B Output
13 QA Comparator A Output
14 QA Comparator A Output
15 LEA Latch Enable A
16 LEA Latch Enable A

Temperature Package

Model Range Description Option* Quantity

AD1317KZ 0°C to +70°C 16-Lead Z-16A 1-24

Gull Wing 25–99

100+

*Z = Ceramic Leaded Chip Carrier.

CONNECTION DIAGRAMS

Dimensions shown in inches and (mm).

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 AD1317 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.

–3–REV. A

AD1317

DEFINITION OF TERMS

Vos INPUT OFFSET VOLTAGE—The voltage that

must be applied between either VINA and VINA/B or
VINB and VINA/B to obtain zero voltage between
outputs QA and QA, or QB and QB, respectively.

dV

/dT OFFSET DRIFT—The ratio of the change in input

OS

offset voltages, over the operating temperature range,
to the change in temperature.

Ibca INPUT BIAS CURRENT (VINA/B, ACTIVE)—

The bias current of the window comparator’s com­mon input with inputs enabled.

Ibci INPUT BIAS CURRENT (VINA/B, INHIBIT)—

The bias current of the window comparator’s com­mon input with inputs inhibited.

Ibsa INPUT BIAS CURRENT (VINA or VINB,

ACTIVE)—The bias current of either single input
with inputs active.

Ibsi INPUT BIAS CURRENT (VINA or VINB,

INHIBIT)—The bias current of either single input
with inputs inhibited.

Rinc INPUT RESISTANCE (VINA/B)—The input

resistance looking into the window comparator’s
common input.

Rins INPUT RESISTANCE (VINA or VINB)—The

input resistance looking into either single input.

C

IN

INPUT CAPACITANCE (VINA/B)—The capaci­tance looking into the window comparator’s common
input.

V

CM

INPUT COMMON-MODE VOLTAGE RANGE—
The range of voltages on the input terminals for
which the offset and propagation delay specifications
apply.

V

DIFF

INPUT DIFFERENTIAL VOLTAGE RANGE—
The maximum difference between any input terminal
voltages.

CMRR COMMON-MODE REJECTION RATIO—The

ratio of common-mode input voltage range to the
peak-to-peak change in input offset voltage over this
range.

I

IH

LOGIC “1” INPUT CURRENT—The logic high
current flowing into (+) or out of (–) a logic input.

I

IL

LOGIC “0” INPUT CURRENT—The logic low
current flowing into (+) or out of (–) a logic input.

V

OH

LOGIC “1” OUTPUT VOLTAGE—The logic high
output voltage with a specified load.

V

OL

LOGIC “0” OUTPUT VOLTAGE—The logic low
output voltage with a specified load.

I

OH

LOGIC “1” OUTPUT CURRENT—The logic high
output source current.

I

OL

LOGIC “0” OUTPUT CURRENT—The logic low
output source current.

I+ POSITIVE SUPPLY CURRENT—The current

required from the +V

supply.

S

I– NEGATIVE SUPPLY CURRENT—The current

required from the –V

supply.

S

PSRR POWER SUPPLY REJECTION RATIO—The ratio

of power supply voltage change to the peak-to-peak
change in input offset voltage.

AD1317 SWITCHING TERMS (See Figure 3)

t

PDR

INPUT TO OUTPUT RISING EDGE DELAY—
The propagation delay measured from the time
VINA/B crosses either VINA or VINB, in a low to
hi

gh transition, to the time QA and QA or QB and

QB cross, respectively.

t

PDF

INPUT TO OUTPUT FALLING EDGE DELAY—
The propagation delay measured from the time
VINA/B crosses either VINA or VINB, in a high to
low transition, to the time QA and QA or QB and
QB cross, respectively.

t

S

MINIMUM LATCH SET-UP TIME—The minium
time before LE goes high with respect to LE that an
input signal change must be present in order to be
acquired and held at the outputs.

t

H

MINIMUM LATCH HOLD TIME—The minium
time after LE goes high with respect to LE that the
input signal must remain unchanged in order to be
acquired and held at the outputs.

t

PW

MINIMUM LATCH ENABLE PULSE WIDTH—
The minimum time that LE must be held high with
respect to LE in order to acquire and hold an input
change.

t

LO

LATCH ENABLE TO OUTPUT DELAY—The
time between when LE goes high with respect to LE
that QA and QA or QB and QB cross.

t

ID

INPUT STAGE DISABLE TIME—The time be­tween when IE goes high with respect to IE that the
input bias currents drop to 10% of their nominal
value.

t

IE

INPUT STAGE ENABLE TIME—The time be­tween when IE goes high with respect to IE that the
input bias currents rise to 90% of their nominal values.

–4–

REV. A