EVB-SHM12 ETC [List of Unclassifed Manufacturers], EVB-SHM12 Datasheet - Page 3

• Manufacturer Part Number: EVB-SHM12
• Description: Ultra-Fast, 12-Bit Linear Monolithic Sample-Hold Amplifiers
• Manufacturer: ETC [List of Unclassifed Manufacturers]

GROUNDING AND LAYOUT
Obtaining fully specified performance from the SHM-12 requires
careful attention to pc-board layout and power supply decoupling.
For optimal performance, tie all grounds directly to a large ana-
log ground plane beneath and around the package. Bypass all
power supplies to ground with 10µF tantalum capacitors in paral-
lel with 0.1µF ceramic capacitors.
®
ANALOG
INPUT
ANALOG
ANALOG
SAMPLE
OUTPUT
INPUT
HOLD
-0.8 V
-1.8 V
-0.8 V
-1.8 V
+1 V
-1 V
+1 V
-1 V
50
®
0.1µF
0.1µF
10µF
0.1µF
–5V
10
1
2
5
7
9
4
Figure 2. SHM-12 Simplified Connection Diagram
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
INPUT
SHM-12
Acquisition
SAMPLE
SAMPLE
±0.024%
15ns typ.
Pin 3 is not connected;
do not connect pins 6 and 8.
Time to
Figure 3. SHM-12 Control and Timing
Track-to-hold Settling
to ±0.024%
EXTERNAL HOLD
7ns typ.
SAMPLE / HOLD
SAMPLE / HOLD
+5V SUPPLY
+5V SUPPLY
+5V SUPPLY
+5V SUPPLY
CAPACITOR
GROUND
OUTPUT
3
Locate the bypass capacitors as close to the unit as possible.
For best performance, controlled impedance transmission line
techniques, such as microstrip, should be used. Mount all com-
ponents as close to the required pins as possible. It is strongly
recommended that the SHM-12 not be socket-mounted.
11
19
18
20
17
14, 16
13
12
15
Feedthrough -80dB
HOLD
HOLD
R
100
Load
C
HO LD
50
+5V
Refer to Table 1 for optional
HOLD capacitor value.
0.1µF
0.1µF
0.1µF
0.1µF
10µF
50
15ns typ.
SAMPLE
HOLD
ANALOG
OUTPUT
7ns typ.
SHM-12