DG189/190/191
Vishay Siliconix
High-Speed Drivers with Dual SPDT JFET Switches
FEATURES
BENEFITS
D Constant On-Resistance Over
Entire Analog Range
D Low Leakage
D Low Crosstalk
D Rad Hardness
D
D
D
D
D
APPLICATIONS
Low Distortion
Eliminates Large Signal Errors
High Precision
High Bandwidth Capability
Fault Protection
D
D
D
D
D
Audio Switching
Video Switching
Sample/Hold
Guidance and Control Systems
Aerospace
DESCRIPTION
The DG189/190/191 are precision dual single-pole,
double-throw (SPDT) analog switches designed to provide
accurate switching of video and audio signals. This series is
ideally suited for applications requiring a constant
on-resistance over the entire analog range.
The major difference in the devices is the on-resistance
(DG189—10 W , DG190—30 W , DG191—75 W). Reduced
errors are achieved through low leakage current (ID(on)
< 2 nA). Applications which benefit from the flat JFET
on-resistance include audio switching, video switching, and
data acquisition.
To achieve fast and accurate switch performance, each device
comprises four n-channel JFET transistors and a TTL
compatible bipolar driver. The driver is designed to achieve
break-before-make switching action, eliminating the
inadvertent shorting between channels and the crosstalk
which would result. In the on state, each switch conducts
current equally well in either direction. In the off condition, the
switches will block up to 20 V peak-to-peak, with feedthrough
of less than −60 dB at 10 MHz.
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
Dual-In-Line
Flat Package
D1
1
16
S1
NC
2
15
IN1
D3
3
14
S3
4
S4
S4
1
14
S3
D4
2
13
D3
V−
D2
3
12
D1
13
VR
S2
4
11
S1
5
12
VL
IN2
5
10
IN1
D4
6
9
V−*
6
11
V+
V+
7
8
NC
VR
7
10
IN2
VL
D2
8
9
S2
Top View
Refer to JAN38510 Information, Military Section
Top View
*Common to Substrate and Case
TRUTH TABLE
Logic
SW1, SW2
SW3, SW4
0
OFF
ON
1
ON
OFF
Logic “0” v 0.8 V
08
g
Logic “1” w 2 4 V
2.4
Document Number: 70034
S-51140—Rev. D, 20-Jun-05
www.vishay.com
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