ANALOG DEVICES ADG774A Service Manual

Low Voltage, 400 MHz, Quad 2:1

www.BDTIC.com/ADI

FEATURES

Bandwidth: >400 MHz Low insertion loss and on resistance: 2.2 Ω typical On resistance flatness: 0.3 Ω typical Single 3 V/5 V supply operation Very low distortion: <0.3% Low quiescent supply current: Fast switching times

= 6 ns

= 3 ns

OFF

TTL-/CMOS-compatible Pb-free packages

16-lead QSSOP 16-lead 3 mm × 3 mm body LFCSP

GENERAL DESCRIPTION

The ADG774A is a monolithic CMOS device comprising four 2:1 multiplexer/demultiplexers with high impedance outputs. The CMOS process provides low power dissipation yet offers high switching speed and low on resistance. The on resistance variation is typically less than 0.5 Ω over the input signal range.

The bandwidth of the ADG774A is typically 400 MHz and this,

upled with low distortion (typically 0.3%), makes the part

co suitable for switching of high speed data signals.

1 nA typical

Mux with 3 ns Switching Time

ADG774A

FUNCTIONAL BLOCK DIAGRAM

S1A

S1B

S2A

S2B

S3A

S3B

S4A

S4B

These switches conduct equally well in both directions when o

n. In the off condition, signal levels up to the supplies are blocked. The ADG774A switches exhibit break-before-make switching action.

PRODUCT HIGHLIGHTS

1. Wide bandwidth data rates of >400 MHz.

2. Ultralow power dissipation.

ADG774A

1 OF 2

DECODER

Figure 1.

2373-001

The on resistance profile is very flat over the full analog input

nge ensuring excellent linearity and low distortion. CMOS

ra construction ensures ultralow power dissipation.

The ADG774A operates from a single 3.3 V/5 V supply and is

TL logic-compatible. The control logic for each switch is

T shown in the truth table (see Tab le 5 ).

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

3. Low leakage over temperature.

4. Break-before-make switching prevents channel shorting

hen the switches are configured as a multiplexer.

5. Crosstalk is typically −70 dB @ 10 MHz.

6. Off isolation is typically −65 dB @ 10 MHz.

7. Available in compact 3 mm × 3 mm LFCSP.

ADG774A

www.BDTIC.com/ADI

TABLE OF CONTENTS

Features.............................................................................................. 1

ESD Caution...................................................................................5

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Product Highlights ........................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Single Supply................................................................................. 3

Absolute Maximum Ratings............................................................ 5

REVISION HISTORY

8/06—Rev. A to Rev. B

Updated Format..................................................................Universal

Added LFCSP Model..........................................................Universal

Added Lead-Free Models ..................................................Universal

Changes to Table 3.............................................................................5

Updated Outline Dimensions....................................................... 13

Changes to Ordering Guide.......................................................... 13

Pin Configurations and Function Descriptions............................6

Typical Performance Characteristics..............................................7

Test Circuits........................................................................................9

Terminology.................................................................................... 11

Application Circuits ....................................................................... 12

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 13

4/03—Rev. 0 to Rev. A

hanges to TPCs 9–11......................................................................5

Updated Outline Dimensions..........................................................8

7/01—Revision 0: Initial Version

Rev. B | Page 2 of 16

ADG774A

www.BDTIC.com/ADI

SPECIFICATIONS

SINGLE SUPPLY

VDD = 5 V ± 10%, GND = 0 V, all specifications T

MIN

to T

, unless otherwise noted.

MAX

Table 1.

B Version

Parameter 25°C T

MIN

to T

Unit Test Conditions/Comments

MAX

ANALOG SWITCH

Analog Signal Range 0 to 2.5 V On Resistance, RON 2.2 Ω typ VD = 0 V to 1 V, IS = −10 mA

3.5 4 Ω max On Resistance Match Between Channels, ∆RON 0.15 Ω typ VD = 0 V to 1 V, IS = −10 mA

0.5 Ω max On Resistance Flatness, R

0.3 Ω typ VD = 0 V to 1 V, IS = −10 mA

FLAT(ON)

0.6 Ω max LEAKAGE CURRENTS

Source Off Leakage, IS (OFF) ±0.001 nA typ VD = 3 V/1 V, VS = 1 V/3 V, see Figure 17 ±0.1 ±0.25 nA max Drain Off Leakage, ID (OFF) ±0.001 nA typ VD = 3 V/1 V, VS = 1 V/3 V, see Figure 17 ±0.1 ±0.25 nA max

Channel On Leakage, ID, IS (ON) ±0.001 nA typ VD = VS = 3 V/1 V, see Figure 18 ±0.1 ±0.25 nA max DIGITAL INPUTS

Input High Voltage, V

Input Low Voltage, V

2.4 V min

INH

0.8 V max

INL

Input Current

or I

INL

0.001 μA typ VIN = V

INH

±0.1 μA max

Digital Input Capacitance, CIN 3 pF typ

DYNAMIC CHARACTERISTICS

tON, tON (EN)

6 ns typ C 12 ns max t

, t

(EN)

OFF

3 ns typ C 6 ns max

Break-Before-Make Time Delay, tD 3 ns typ CL = 35 pF, RL = 50 Ω, VS1 = VS2 = 2 V, see Figure 23 1 ns min Off Isolation −65 dB typ f = 10 MHz, RL = 50 Ω, see Figure 20 Channel-to-Channel Crosstalk −70 dB typ f = 10 MHz, RL = 50 Ω, see Figure 21 Bandwidth −3 dB 400 MHz typ RL = 50 Ω, see Figure 19 Distortion 0.3 % typ RL = 100 Ω Charge Injection 6 pC typ CL = 1 nF, see Figure 24, VS = 0 V CS (OFF) 5 pF typ CD (OFF) 7.5 pF typ CD, CS (ON) 12 pF typ

POWER REQUIREMENTS VDD = 5.5 V Digital inputs = 0 V or VDD

IDD 1 μA max

0.001 μA typ

Temperature range for B version is −40°C to +85°C.

Guaranteed by design, not subject to production test.

or V

INH

INL

= 35 pF, RL = 50 Ω, VS = 2 V, see Figure 22

Rev. B | Page 3 of 16

ADG774A

www.BDTIC.com/ADI

VDD = 3 V ± 10%, GND = 0 V, all specifications T

MIN

to T

, unless otherwise noted.

MAX

Table 2.

B Version Parameter 25°C T

MIN

to T

Unit Test Conditions/Comments

MAX

ANALOG SWITCH

Analog Signal Range 0 to 1.5 V On Resistance, RON 4 Ω typ VD = 0 V to 1 V; IS = −10 mA 6 7 Ω max On Resistance Match Between Channels, ∆RON

0.15 Ω typ VD = 0 V to 1 V, IS = −10 mA

0.5 Ω max On Resistance Flatness, R

1.5 Ω typ VD = 0 V to 1 V, IS = −10 mA

FLAT(ON)

3 Ω max

LEAKAGE CURRENTS

Source Off Leakage, IS (OFF) ±0.001 nA typ VD = 2 V/1 V, VS = 1 V/2 V, see Figure 17 ±0.1 ±0.25 nA max Drain Off Leakage, ID (OFF) ±0.001 nA typ VD = 2 V/1 V, VS = 1 V/2 V, see Figure 17 ±0.1 ±0.25 nA max Channel On Leakage, ID, IS(ON) ±0.001 nA typ VD = VS = 2 V/1 V, see Figure 18 ±0.1 ±0.25 nA max

DIGITAL INPUTS

Input High Voltage, V Input Low Voltage, V

2.0 V min

INH

0.4 V max

INL

Input Current

or I

INL

0.001 μA typ VIN = V

INH

INL

or V

INH

±0.1 μA max Digital Input Capacitance, CIN 3 pF typ

DYNAMIC CHARACTERISTICS

tON, tON (EN)

7 ns typ C

= 35 pF, RL = 50 Ω, VS = 1.5 V, see Figure 22

14 ns max t

, t

(EN)

OFF

4 ns typ C

= 35 pF, RL = 50 Ω, VS = 1.5 V, see Figure 22

8 ns max Break-Before-Make Time Delay, tD 3 ns typ CL = 35 pF, RL = 50 Ω, VS1 = VS2 = 1.5 V, see Figure 23 1 ns min Off Isolation −65 dB typ f = 10 MHz, RL = 50 Ω Channel-to-Channel Crosstalk −70 dB typ f = 10 MHz, RL = 50 Ω, see Figure 21 Bandwidth −3 dB 400 MHz typ RL = 50 Ω, see Figure 19 Distortion 1.5 % typ RL = 100 Ω Charge Injection 4 pC typ CL = 1 nF, see Figure 24, VS = 0 V CS (OFF) 5 pF typ CD (OFF) 7.5 pF typ

CD, CS (ON) 12 pF typ POWER REQUIREMENTS VDD = 3.3 V Digital inputs = 0 V or VDD

IDD 1 μA max

0.001 μA typ

Temperature range for B version is −40°C to +85°C.

Guaranteed by design, not subject to production test.

Rev. B | Page 4 of 16

ADG774A

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted.

Table 3.

Parameters Rating

VDD to GND −0.3 V to +6 V Analog, Digital Inputs

Continuous Current, S or D 100 mA Peak Current, S or D

Operating Temperature Range

Industrial (B Version) −40°C to +85°C Storage Temperature Range −65°C to +150°C Junction Temperature 150°C Thermal Impedance, θJA

16-Lead QSSOP 105.44°C/W 16-Lead LFCSP(3 mm × 3 mm) 48.7°C/W

Lead Temperature Soldering

Vapor Phase (60 sec) 215°C

Infrared (15 sec) 220°C Reflow Soldering (Pb-free)

Peak Temperature 260°C (+0°C/–5°C)

Time at Peak Temperature 10 sec to 40 sec

Overvoltages at IN, S, or D are clamped by internal diodes. Current should be

limited to the maximum ratings given.

Measured with the device soldered on a four-layer board.

−0.3 V to VDD + 0.3 V or 30 mA, whichever occurs first

300 mA (pulsed at 1 ms, 10% duty c

ycle max)

Stresses above those listed under Absolute Maximum Ratings ma

y 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. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Only one absolute maximum rating may be applied at any one time.

ESD CAUTION

Rev. B | Page 5 of 16

+ 11 hidden pages