I
2
C-Compatible, Wide Bandwidth,
Quad, 2:1 Multiplexer
ADG791A/ADG791G
FEATURES
Bandwidth: 325 MHz
Low insertion loss and on resistance: 2.6 Ω typical
On resistance flatness: 0.3 Ω typical
Single 3 V/5 V supply operation
3.3 V analog signal range (5 V supply, 75 Ω load)
Low quiescent supply current: 1 nA typical
Fast switching times: t
ON
= 186 ns, t
OFF
= 177 ns
I
2
C®-compatible interface
Compact 24-lead LFCSP
ESD protection
4 kV human body model (HBM)
200 V machine model (MM)
1 kV field-induced charged device model (FICDM)
V
DD
FUNCTIONAL BLOCK DIAGRAM
GND
V
DD
GND
ADG791A
S1A
D1
S1B
S2A
D2
S2B
S3A
D3
S3B
S4A
D4
S4B
I
2
C SERIAL
INTERFACE
S4B
S3B
S4A
S2B
S3A
S1B
S2A
S1A
ADG791G
D1
D2
D3
D4
I
2
C SERIAL
INTERFACE
GPO1
06033-001
APPLICATIONS
S-video RGB/YPbPr video switches
HDTVs
Projection TVs
DVD-R/RW
AV receivers
A0
A1
A2 SDA SCL
A0
A1
A2 SDA SCL
Figure 1.
GENERAL DESCRIPTION
The ADG791A/ADG791G are monolithic CMOS devices
comprising four 2:1 multiplexers/demultiplexers controllable
via a standard I
2
C serial interface. The CMOS process provides
ultralow power dissipation yet gives high switching speed and
low on resistance.
The on-resistance profile is very flat over the full analog input
range and wide bandwidth ensures excellent linearity and low
distortion. These features, combined with a wide input signal
range make the ADG791A/ADG791G the ideal switching
solution for a wide range of TV applications including S-video,
RGB, and YPbPr video switches.
The switches conduct equally well in both directions when on.
In the off condition, signal levels up to the supplies are blocked.
The ADG791A/ADG791G switches exhibit break-before-make
switching action. The ADG791G has one general-purpose logic
output pin controlled by the I
2
C interface that can also be used
to control other non-I
2
C-compatible devices such as video filters.
The integrated I
2
C interface provides a large degree of flexibility
in the system design. It has three configurable I
2
C address pins
that allow up to eight devices on the same bus. This allows the
user to expand the capability of the device by increasing the size
of the switching array.
The ADG791A/ADG791G operate from a single 3 V or 5 V
supply voltage and is available in a compact 4 mm × 4 mm
body, 24-lead LFCSP.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
Wide bandwidth: 325 MHz.
Ultralow power dissipation.
Extended input signal range.
Integrated I
2
C serial interface.
Compact 4 mm × 4 mm, 24-lead, Pb-free LFCSP.
ESD protection tested as per ESD association standards:
4 kV HBM (ANSI/ESD STM5.1-2001)
200 V MM (ANSI/ESD STM5.2-1999)
1 kV FICDM (ANSI/ESDSTM5.3.1-1999)
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
ADG791A/ADG791G
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
I
2
C Timing Specifications............................................................ 7
Timing Diagram ........................................................................... 8
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Pin Configurations and Function Descriptions ......................... 10
Typical Performance Characteristics ........................................... 11
Test Circuits..................................................................................... 14
Terminology .................................................................................... 16
Theory of Operation ...................................................................... 17
I
2
C Serial Interface ..................................................................... 17
I
2
C Address.................................................................................. 17
Write Operation.......................................................................... 17
LDSW Bit..................................................................................... 19
Power On/Software Reset.......................................................... 19
Read Operation........................................................................... 19
Evaluation Board ............................................................................ 20
Using the ADG791G Evaluation Board .................................. 20
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
REVISION HISTORY
7/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 24
ADG791A/ADG791G
SPECIFICATIONS
V
DD
= 5 V ± 10%, GND = 0 V, T
A
= −40°C to +85°C, unless otherwise noted.
Table 1.
Parameter
ANALOG SWITCH
Analog Signal Range
2
On Resistance, R
ON
On-Resistance Matching Between
Channels, ∆R
ON
On-Resistance Flatness, R
FLAT (ON)
LEAKAGE CURRENTS
Source OFF Leakage (I
S (OFF)
)
Drain OFF Leakage (I
D (OFF)
)
Channel ON Leakage (I
D (ON)
, I
S (ON)
)
DYNAMIC CHARACTERISTICS
3
t
ON
, t
ENABLE
t
OFF
, t
DISABLE
Break-Before-Make Time Delay, t
D
I
2
C to GPO Propagation Delay, t
H
, t
L
Off Isolation
Channel-to-Channel Crosstalk
Same Multiplexer
Different Multiplexer
−3 dB Bandwidth
THD + N
Charge Injection
C
S (OFF)
C
D (OFF)
C
D (ON)
, C
S (ON)
Power Supply Rejection Ratio, PSRR
Differential Gain Error
Differential Phase Error
LOGIC INPUTS
3
A0, A1, A2
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
INL
or I
INH
Input Capacitance, C
IN
SCL, SDA
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Leakage Current, I
IN
Input Hysteresis
Input Capacitance, C
IN
Conditions
V
S
= V
DD
, R
L
= 1 MΩ
V
S
= V
DD
, R
L
= 75 Ω
V
D
= 0 V, I
DS
= −10 mA, see Figure 22
V
D
= 0 V to 1 V, I
DS
= −10 mA, see Figure 22
V
D
= 0 V, I
DS
= −10 mA
V
D
= 1 V, I
DS
= −10 mA
V
D
= 0 V to 1 V, I
DS
= −10 mA
V
D
= 4 V/1 V, V
S
= 1 V/4 V, see Figure 23
V
D
= 4 V/1 V, V
S
= 1 V/4 V, see Figure 23
V
D
= V
S
= 4 V/1 V, see Figure 24
C
L
= 35 pF, R
L
= 50 Ω, V
S
= 2 V, see Figure 28
C
L
= 35 pF, R
L
= 50 Ω, V
S
= 2 V, see Figure 28
C
L
= 35 pF, R
L
= 50 Ω, V
S1
= V
S2
= 2 V, see Figure 29
(ADG791G only)
f
= 10 MHz, R
L
= 50 Ω, see Figure 26
f
= 10 MHz, R
L
= 50 Ω, see Figure 27
Min
0
0
2.6
Typ
1
Max
4
3.3
3.5
4
0.5
0.6
0.55
Unit
V
V
Ω
Ω
Ω
Ω
Ω
nA
nA
nA
250
240
130
−60
−55
−70
325
0.14
5
10
13
27
70
0.32
0.44
ns
ns
ns
ns
dB
dB
dB
MHz
%
pC
pF
pF
pF
dB
%
Degrees
0.15
0.3
±0.25
±0.25
±0.25
186
177
3
1
R
L
= 50 Ω, see Figure 25
R
L
= 100 Ω
C
L
= 1 nF, V
S
= 0 V, see Figure 30
f
= 20 kHz
CCIR330 test signal
CCIR330 test signal
2.0
V
IN
= 0 V to V
DD
0.005
3
0.7 × V
DD
−0.3
V
IN
= 0 V to V
DD
0.005
0.05 × V
DD
3
0.8
±1
V
V
μA
pF
V
V
μA
V
pF
V
DD
+ 0.3
+0.3 × V
DD
±1
Rev. 0 | Page 3 of 24
ADG791A/ADG791G
Parameter
LOGIC OUTPUTS
3
SDA Pin
Output Low Voltage, V
OL
Floating-State Leakage Current
Floating-State Output Capacitance
GPO1 Pin and GPO2 Pin
Output Low Voltage, V
OL
Output High Voltage, V
OH
POWER REQUIREMENTS
I
DD
Conditions
Min
Typ
1
Max
Unit
I
SINK
= 3 mA
I
SINK
= 6 mA
0.4
0.6
±1
10
0.4
2.0
0.001
1
0.2
0.7
V
V
μA
pF
V
V
μA
mA
mA
I
LOAD
= +2 mA
I
LOAD
= −2 mA
Digital inputs = 0 V or V
DD
, I
2
C interface inactive
I
2
C interface active, f
SCL
= 400 kHz
I
2
C interface active, f
SCL
= 3.4 MHz
1
2
All typical values are at T
A
= 25°C, unless otherwise stated.
Guaranteed by initial characterization, not subject to production test.
3
Guaranteed by design, not subject to production test.
Rev. 0 | Page 4 of 24
ADG791A/ADG791G
V
DD
= 3 V ± 10%, GND = 0 V, T
A
= −40°C to +85°C, unless otherwise noted.
Table 2.
Parameter
ANALOG SWITCH
Analog Signal Range
2
On Resistance, R
ON
On-Resistance Matching Between
Channels, ∆R
ON
On-Resistance Flatness, R
FLAT (ON)
LEAKAGE CURRENTS
Source Off Leakage (I
S (OFF)
)
Drain Off Leakage (I
D (OFF)
)
Channel On Leakage (I
D (ON)
, I
S (ON)
)
DYNAMIC CHARACTERISTICS
3
t
ON
, t
ENABLE
t
OFF
, t
DISABLE
Break-Before-Make Time Delay, t
D
I
2
C to GPO Propagation Delay, t
H
, t
L
(ADG791G only)
Off Isolation
Channel-to-Channel Crosstalk
Same Multiplexer
Different Multiplexer
−3 dB Bandwidth
THD + N
Charge Injection
C
S (OFF)
C
D (OFF)
C
D (ON)
, C
S (ON)
Power Supply Rejection Ratio, PSRR
Differential Gain Error
Differential Phase Error
LOGIC INPUTS
3
A0, A1, A2
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
INL
or I
INH
Input Capacitance, C
IN
SCL, SDA
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Leakage Current, I
IN
Input Hysteresis
Input Capacitance, C
IN
Conditions
V
S
= V
DD
, R
L
= 1 MΩ
V
S
= V
DD
, R
L
= 75 Ω
V
D
= 0 V, I
DS
= −10 mA, see Figure 22
V
D
= 0 V to 1 V, I
DS
= −10 mA, see Figure 22
V
D
= 0 V, I
DS
= −10 mA
V
D
= 1 V, I
DS
= −10 mA
V
D
= 0 V to 1 V, I
DS
= −10 mA
V
D
= 2 V/1 V, V
S
= 1 V/2 V, see Figure 23
V
D
= 2 V/1 V, V
S
= 1 V/2 V, see Figure 23
V
D
= V
S
= 2 V/1 V, see Figure 24
C
L
= 35 pF, R
L
= 50 Ω, V
S
= 2 V, see Figure 28
C
L
= 35 pF, R
L
= 50 Ω, V
S
= 2 V, see Figure 28
C
L
= 35 pF, R
L
= 50 Ω, V
S1
= V
S2
= 2 V, see Figure 29
Min
0
0
3
Typ
1
Max
2.2
1.7
4
6
0.6
1.1
2.8
Unit
V
V
Ω
Ω
Ω
Ω
Ω
nA
nA
nA
270
260
121
f
= 10 MHz, R
L
= 50 Ω, see Figure 26
f
= 10 MHz, R
L
= 50 Ω, see Figure 27
−60
−55
−70
310
0.14
2.5
10
13
27
70
0.28
0.28
ns
ns
ns
ns
dB
dB
dB
MHz
%
pC
pF
pF
pF
dB
%
Degrees
0.15
0.8
±0.25
±0.25
±0.25
198
195
3
1
R
L
= 50 Ω, see Figure 25
R
L
= 100 Ω
C
L
= 1 nF, V
S
= 0 V, see Figure 30
f
= 20 kHz
CCIR330 test signal
CCIR330 test signal
2.0
V
IN
= 0 V to V
DD
0.005
3
0.7 × V
DD
−0.3
V
IN
= 0 V to V
DD
0.005
0.05 × V
DD
3
0.8
±1
V
V
μA
pF
V
V
μA
V
pF
V
DD
+ 0.3
+0.3 × V
DD
±1
Rev. 0 | Page 5 of 24
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