Analog Devices ADG794 Datasheet
Low Voltage, 300 MHz Quad 2:1 Mux Analog
FEATURES
Bandwidth: 300 MHz
Low insertion loss and on resistance: 5 Ω typical
On resistance flatness: 0.68 Ω typical
Single 3 V/5 V supply operation
Low quiescent supply current: 1 nA typical
Fast switching times:
, 7 ns
t
ON
t
, 5 ns
OFF
TTL/CMOS compatible
APPLICATIONS
RGB switches
HDTV
DVD-R
Audio/video switches
GENERAL DESCRIPTION
The ADG794 is a monolithic CMOS device comprising four
2:1 multiplexer/demultiplexers with high impedance outputs.
The CMOS process provides low power dissipation yet gives
high switching speed and low on resistance. The on resistance
variation is typically less than 1.2 Ω over the input signal range.
The bandwidth of the ADG794 is typically 300 MHz and this,
coupled with low distortion (typically 0.68%), makes the part
suitable for switching analog audio/video signals.
HDTV Audio/Video Switch
ADG794
FUNCTIONAL BLOCK DIAGRAM
S1A
S1B
S2A
S2B
S3A
S3B
S4A
S4B
These switches conduct equally well in both directions when on.
In the off condition, signal levels up to the supplies are blocked.
The ADG794 switches exhibit break-before-make switching
action.
The ADG794 is available in a 16-pin QSOP package.
PRODUCT HIGHLIGHTS
1. Wide bandwidth: 300 MHz.
ADG794
1 OF 2
DECODER
EN
Figure 1.
D1
D2
D3
D4
IN
05150-001
The ADG794 operates from a single 3.3 V/5 V supply and is
TTL logic compatible. The switches are controlled by the logic
EN
inputs IN and
as shown in Table 4. The EN pin allows the
user to disable all switches.
Rev. 0
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 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.
2. Ultralow power dissipation.
3. Crosstalk is typically −70 dB at 10 MHz.
4. Off isolation is typically −65 dB at 10 MHz.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
www.analog.com
ADG794
TABLE OF CONTENTS
Specifications..................................................................................... 3
Typical Perfor m a n c e Character i stics ..............................................8
Single Supply ................................................................................. 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Te r m in o l o g y ...................................................................................... 7
REVISION HISTORY
10/04—Revision 0: Initial Version
Typical Application .......................................................................8
Tes t Ci rc u it s ........................................................................................9
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 11
Rev. 0 | Page 2 of 12
ADG794
SPECIFICATIONS
SINGLE SUPPLY
VDD = 5 V ± 10%, GND = 0 V. All specifications T
Table 1.
Parameter 25°C T
ANALOG SWITCH
Analog Signal Range 0 to 2.5 V
On Resistance (RON) 5 Ω typ VD = 0 V to 1 V; IS = −10 mA; Figure 6
7 8 Ω max
On Resistance Match between Channels (∆RON) 0.4 Ω typ VD = 0 V to 1 V; IS = −10 mA
1.2 Ω max
On Resistance Flatness (R
) 0.7 Ω typ VD = 0 V to 1 V; IS = −10 mA
FLAT(ON)
1.35 Ω max
LEAKAGE CURRENTS
Source Off Leakage, IS (Off) ±0.001 nA typ VS = 3 V/1 V; VD = 1 V/3 V; Figure 7
Drain Off Leakage, ID (Off) ±0.001 nA typ VS = 3 V/1 V; VD = 1 V/3 V; Figure 7
Channel On Leakage, ID, IS (On) ±0.001 nA typ VD = VS = 3 V/1 V; Figure 8
DIGITAL INPUTS
Input High Voltage, V
Input Low Voltage, V
INH
INL
Input Current
I
or I
INL
INH
±0.1 µA max
Digital Input Capacitance, C
DYNAMIC CHARACTERISTICS
IN
2
tON, tON (EN)
14 ns max VS = 2 V; Figure 9
t
, t
(EN)
OFF
OFF
8 ns max VS = 2 V; Figure 9
Break-Before-Make Time Delay, t
D
1 ns min VS1 = VS2 = 2 V; Figure 10
Off Isolation −65 dB typ f = 10 MHz; RL = 50 Ω; Figure 12
Channel-to-Channel Crosstalk −70 dB typ f = 10 MHz; RL = 50 Ω; Figure 13
Bandwidth −3 dB 300 MHz typ RL = 50 Ω; Figure 11
Distortion 0.7 % typ RL = 100 Ω
Charge Injection 6 pC typ CL = 1 nF; VS = 0 V; Figure 14
CS (Off) 6 pF typ
CD (Off) 7.5 pF typ
CD, CS (On) 13.5 pF typ
POWER REQUIREMENTS VDD = 5.5 V; digital inputs = 0 V or V
I
DD
1 µA max
1
Temperature range for B Version is −40°C to +85°C.
2
Guaranteed by design, not subject to production test.
MIN
to T
, unless other wise no ted.
MAX
MIN
1
to T
MAX
B Version
Unit Test Conditions/Comments
2.4 V min
0.8 V max
0.001 µA typ VIN = V
INL
or V
3 pF typ
7 ns typ C
5 ns typ C
= 35 pF; RL = 50 Ω
L
= 35 pF; RL = 50 Ω
L
3 ns typ CL = 35 pF; RL = 50 Ω
0.001 µA typ
INH
DD
Rev. 0 | Page 3 of 12
ADG794
VDD = 3 V ± 10%, GND = 0 V. All specifications T
Table 2.
B Version
Parameter 25°C T
ANALOG SWITCH
Analog Signal Range 0 to 1.5 V
On Resistance (RON) 7 Ω typ VD = 0 V to 1 V; IS = −10 mA; Figure 6
9.5 11 Ω max
On Resistance Match between Channels (∆RON)
0.9 Ω max
On Resistance Flatness (R
) 2.6 Ω typ VD = 0 V to 1 V; IS = −10 mA
FLAT(ON)
5 Ω max
LEAKAGE CURRENTS
Source Off Leakage, IS (Off) ±0.001 nA typ VS = 2 V/1 V; VD = 1 V/2 V; Figure 7
Drain Off Leakage, ID (Off) ±0.001 nA typ VS = 2 V/1 V; VD = 1 V/2 V; Figure 7
Channel On Leakage, ID, IS (On) ±0.001 nA typ VD = VS = 2 V/1 V; Figure 8
DIGITAL INPUTS
Input High Voltage, V
Input Low Voltage, V
INH
INL
Input Current
I
or I
INL
INH
±0.1 µA max
Digital Input Capacitance, C
DYNAMIC CHARACTERISTICS
IN
2
tON, tON (EN)
16 ns max VS = 1.5 V; Figure 9
t
, t
(EN)
OFF
OFF
10 ns max VS = 1.5 V; Figure 9
Break-Before-Make Time Delay, t
D
1 ns min VS1 = VS2 = 1.5 V; Figure 10
Off Isolation −65 dB typ f = 10 MHz; RL = 50 Ω; Figure 12
Channel-to-Channel Crosstalk −70 dB typ f = 10 MHz; RL = 50 Ω; Figure 13
Bandwidth −3 dB 300 MHz typ RL = 50 Ω; Figure 11
Distortion 2.6 % typ RL = 100 Ω
Charge Injection 4 pC typ CL = 1 nF; VS = 0 V; Figure 14
CS (Off) 6 pF typ
CD (Off) 7.5 pF typ
CD, CS (On) 13.5 pF typ
POWER REQUIREMENTS VDD = 3.3 V; digital inputs = 0 V or V
I
DD
1 µA max
1
Temperature range for B Version is −40°C to +85°C.
2
Guaranteed by design, not subject to production test.
MIN
to T
, unless other wise no ted.
MAX
1
to T
MIN
Unit Test Conditions/Comments
MAX
0.3 Ω typ VD = 0 V to 1 V; IS = −10 mA
2.0 V min
0.4 V max
0.001 µA typ VIN = V
INL
or V
3 pF typ
8 ns typ C
6 ns typ C
= 35 pF; RL = 50 Ω
L
= 35 pF; RL = 50 Ω
L
3 ns typ CL = 35 pF; RL = 50 Ω
0.001 µA typ
INH
DD
Rev. 0 | Page 4 of 12
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