Datasheet

ManualsBrandsANALOG DEVICES ManualsInterface ICsInterface IC - multiplexers, demultiplexers LFCSP 16 VQ

Low Voltage, 400 MHz, Quad 2:1

Mux with 3 ns Switching Time

ADG774A

Rev. B

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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: 1 nA typical

Fast switching times

= 6 ns

OFF

= 3 ns

TTL-/CMOS-compatible

Pb-free packages

16-lead QSSOP

16-lead 3 mm × 3 mm body LFCSP

FUNCTIONAL BLOCK DIAGRAM

1 OF 2

DECODER

ADG774A

S1A

S1B

S2A

S2B

S3A

S3B

S4A

S4B

2373-001

Figure 1.

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,

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

suitable for switching of high speed data signals.

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

range ensuring excellent linearity and low distortion. CMOS

construction ensures ultralow power dissipation.

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

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

shown in the truth table (see

Table 5).

These switches conduct equally well in both directions when

on. 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.

3. Low leakage over temperature.

4. Break-before-make switching prevents channel shorting

when 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.

Summary of content (16 pages)

PAGE 1
Low Voltage, 400 MHz, Quad 2:1 Mux with 3 ns Switching Time ADG774A FEATURES FUNCTIONAL BLOCK DIAGRAM 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.
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ADG774A TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................5 Functional Block Diagram .............................................................. 1 Pin Configurations and Function Descriptions ............................6 General Description .........................................................................
PAGE 3
ADG774A SPECIFICATIONS SINGLE SUPPLY VDD = 5 V ± 10%, GND = 0 V, all specifications TMIN to TMAX, unless otherwise noted. 1 Table 1. Parameter ANALOG SWITCH Analog Signal Range On Resistance, RON On Resistance Match Between Channels, ∆RON 25°C B Version TMIN to TMAX 0 to 2.5 2.2 3.5 0.15 4 0.5 On Resistance Flatness, RFLAT(ON) 0.3 0.
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ADG774A VDD = 3 V ± 10%, GND = 0 V, all specifications TMIN to TMAX, unless otherwise noted. 1 Table 2. Parameter ANALOG SWITCH Analog Signal Range On Resistance, RON On Resistance Match Between Channels, ∆RON 25°C B Version TMIN to TMAX 0 to 1.5 4 6 0.15 7 0.5 On Resistance Flatness, RFLAT(ON) 1.5 3 LEAKAGE CURRENTS Source Off Leakage, IS (OFF) Drain Off Leakage, ID (OFF) Channel On Leakage, ID, IS(ON) DIGITAL INPUTS Input High Voltage, VINH Input Low Voltage, VINL Input Current IINL or IINH ±0.
PAGE 5
ADG774A ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 3. Parameters VDD to GND Analog, Digital Inputs 1 Continuous Current, S or D Peak Current, S or D Operating Temperature Range Industrial (B Version) Storage Temperature Range Junction Temperature Thermal Impedance, θJA 16-Lead QSSOP 16-Lead LFCSP(3 mm × 3 mm) Lead Temperature Soldering Vapor Phase (60 sec) Infrared (15 sec) Reflow Soldering (Pb-free) Peak Temperature Time at Peak Temperature Rating −0.3 V to +6 V −0.3 V to VDD + 0.
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ADG774A EN S1B 3 14 S4A D1 2 D1 4 13 S4B S2A 3 S2A 5 12 D4 S2B 4 S2B 6 11 S3A D2 7 10 S3B GND 8 9 D3 13 EN 14 VDD ADG774A TOP VIEW (Not to Scale) D2 5 TOP VIEW (Not to Scale) 02373-002 ADG774A PIN 1 INDICATOR S1B 1 12 S4A 11 S4B 10 D4 9 S3A NOTES 1. THE EXPOSED PAD SHOULD BE TIED TO GND. Figure 2. QSOP Pin Configuration Figure 3. LFCSP Pin Configuration Table 4. Pin Function Descriptions QSOP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin No.
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ADG774A TYPICAL PERFORMANCE CHARACTERISTICS 20 20 VDD = 3V TA = 25°C 16 15 12 RON (Ω) RON (Ω) VDD = 5.0V VDD = 4.5V 10 8 +85°C +25°C 5 VDD = 5.5V 4 0 1 2 3 4 0 5 VS/VD (V) Figure 4. On Resistance as a Function of Drain (VD) or Source (VS) Voltage for VDD = 5 V ± 10% 1.5 2.0 2.5 3.0 0.025 VDD = 5.0V 0.020 VSS = 0V TEMP = 25°C VD = VDD – VS 0.015 16 0.010 CURRENT (nA) VDD = 3.0V 12 VDD = 2.7V ID (OFF) 0.005 0 –0.005 IS (OFF) –0.010 4 IS, ID (ON) –0.015 VDD = 3.3V 0.5 1.
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ADG774A 0.05 0 VDD = 5.0V VSS = 0V TEMP = 25°C VD = 3V/1V VS = 1V/3V 0.04 0.03 –20 IS, ID (ON) ATTENUATION (dB) CURRENT (nA) 0.02 ID (OFF) 0.01 0 –0.01 IS (OFF) –0.02 –40 –60 –80 –0.03 15 25 35 45 55 65 75 85 TEMPERATURE (°C) –100 0.01 02373-009 5 CURRENT (nA) 1000 100 1000 2.0 2.5 IS, ID (ON) 0.02 IS (OFF) 0.01 0 –0.01 100 Figure 13. Crosstalk vs. Frequency ON RESPONSE (dB) 0.03 10 0 VDD = 3.0V VSS = 0V TEMP = 25°C VD = 2V/1V VS = 1V/2V 0.
PAGE 9
ADG774A TEST CIRCUITS VDD 0.1µF ADG774A IDS V1 S1A 50Ω D VS IN 02373-019 RON = V1/IDS VIN VOUT D1 EN 50Ω GND Figure 16. On Resistance 02373-024 S VS NETWORK ANALYZER Figure 19. Bandwidth VDD 0.1µF ADG774A S A D NETWORK ANALYZER ID (OFF) S1A A VS 50Ω 50Ω 02373-020 VD VS IN VIN VOUT D1 EN 50Ω GND Figure 17. Off Leakage 02373-025 IS (OFF) Figure 20. Off Isolation VDD 0.
PAGE 10
ADG774A 5V 0.1µF VIN 3V VDD S 50% VOUT D VS RL 100Ω IN CL 35pF 50% 90% 90% VOUT tOFF tON 02373-022 GND EN Figure 22. Switching Times 5V 0.1µF VDD 3V S1A VS VOUT D1 S1B RL 100Ω VS CL 35pF VIN 50% 50% 0V VOUT DECODER 80% VS tD EN 80% tD 02373-023 GND Figure 23.
PAGE 11
ADG774A TERMINOLOGY VDD Most positive power supply potential. VD (VS) Analog voltage on the D and S terminals. GND Ground (0 V) reference. CS (OFF) Off switch source capacitance. S Source terminal. May be an input or output. CD (OFF) Off switch drain capacitance. D Drain terminal. May be an input or output. CD, CS (ON) On switch capacitance. IN Logic control input. tON Delay between applying the digital control input and the output switching on. See Figure 22. EN Logic control input.
PAGE 12
ADG774A APPLICATION CIRCUITS 10 BASE Tx+ 10 BASE Tx– Tx1 ADG774A 100 BASE Tx+ Tx2 100 BASE Tx– RJ45 10 BASE Tx+ Rx1 10 BASE Tx– TRANSFORMER 100 BASE Tx+ Rx2 100 BASE Tx– 02373-015 10 BASE Tx 100 BASE Tx Figure 25. Full Duplex Transceiver Tx1 Figure 26. Loop Back 100Ω 02373-017 Figure 27. Line Termination Rev. B | Page 12 of 16 02373-018 120Ω 02373-016 Rx1 Figure 28.
PAGE 13
ADG774A OUTLINE DIMENSIONS 0.197 0.193 0.189 9 16 0.158 0.154 0.150 1 8 0.244 0.236 0.228 PIN 1 0.069 0.053 0.065 0.049 0.010 0.025 0.004 BSC COPLANARITY 0.004 0.012 0.008 SEATING PLANE 0.010 0.006 8° 0° 0.050 0.016 COMPLIANT TO JEDEC STANDARDS MO-137-AB Figure 29. 16-Lead Shrink Small Outline Package [QSOP] (RQ-16) Dimensions shown in inches 3.00 BSC SQ 0.60 MAX 0.45 PIN 1 INDICATOR TOP VIEW 13 12 2.75 BSC SQ 0.80 MAX 0.65 TYP 12° MAX SEATING PLANE 16 1 EXPOSED PAD 0.50 BSC 0.
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ADG774A NOTES Rev.
PAGE 15
ADG774A NOTES Rev.