SMP08 Analog Devices, Inc., SMP08 Datasheet - Page 6

• Manufacturer Part Number: SMP08
• Description: Octal Sample-and-hold With Multiplexed Input
• Manufacturer: Analog Devices, Inc.

SMP08
APPLICATIONS INFORMATION
The SMP08, a multiplexed octal S/H, minimizes board space in
systems requiring cycled calibration or an array of control volt-
ages. When used in conjunction with a low cost 16-bit D/A, the
SMP08 can easily be integrated into microprocessor based sys-
tems. Since the SMP08 features break-before-make switching
and an internal decoder, no external logic is required. The
SMP08 has an internally regulated TTL supply so that TTL/
CMOS compatibility is maintained over the full supply range.
See Figure 18 for channel decode address information.
POWER SUPPLIES
The SMP08 is capable of operating with either single or dual
supplies, over a voltage range of 7 volts to 15 volts. Based on the
supply voltages chosen, V
output voltage range, which is:
Note that several specifications, including acquisition time, off-
set and output voltage compliance, will degrade for supply volt-
ages of less than 7 V.
If split supplies are used, the negative supply should be bypassed
with a 0.1 F capacitor in parallel with a 10 F to ground. The
internal hold capacitors are connected to this supply pin and any
noise will appear at the outputs.
In single supply applications, it is extremely important that the
V
hold capacitors are internally tied to the V
ground noise or disturbance will directly couple to the output of
the sample-and-hold, degrading the signal-to-noise perfor-
mance. The analog and digital ground traces on the circuit
board should be physically separated to reduce digital switching
noise from entering the analog circuitry.
POWER SUPPLY SEQUENCING
V
nals. The SMP08 has been designed to be immune to latchup,
but standard precautions should still be taken.
SS
DD
(negative supply) pin is connected to a clean ground. The
should be applied to the SMP08 before the logic input sig-
(V
SS
+0.06 V)
DD
and V
V
OUT/IN
R2
10k
SS
establish the input and
R2
10k
(V
SS
DD
(negative) rail. Any
–2 V)
R2
10k
6.5k
R2
10k
R3
Figure 17. Burn-In Circuit
1
2
3
4
5
6
7
8
–6–
SMP08
1k
R4
OUTPUT BUFFERS (Pins 1, 2, 4, 5, 12, 13, 14, 15)
The buffer offset specification is 10 mV; this is less than 1/2 LSB
of an 8-bit DAC with 10 V full scale. The hold step (magni-
tude of step caused in the output voltage when switching from
sample-to-hold mode, also referred to as the pedestal error or
sample-to-hold offset), is about 2.5 mV with little variation
over the full output voltage range, T
droop rate of a held channel is 2 mV/s typical and 20 mV/s
maximum.
The buffers are designed to drive loads connected to ground.
The outputs can source more than 20 mA, over the full voltage
range, but have limited current sinking capability near V
split supply operation, symmetrical output swings can be ob-
tained by restricting the output range to 2 V from either supply.
On-chip SMP08 buffers eliminate potential stability problems
associated with external buffers; outputs are stable with ca-
pacitive loads up to 500 pF. However, since the SMP08’s
buffer outputs are not short-circuit protected, care should be
taken to avoid shorting any output to the supplies or ground.
SIGNAL INPUT (Pin 3)
The signal input should be driven from a low impedance volt-
age source such as the output of an op amp. The op amp
should have a high slew rate and fast settling time if the
SMP08’s acquisition time characteristics are to be maintained.
As with all CMOS devices, all input voltages should be kept
within range of the supply rails (V
possibility of latchup. If single supply operation is desired, op
amps such as the OP183 or AD820 that have input and output
voltage compliances including ground, can be used to drive the
inputs. Split supplies, such as 7.5 V, can be used with the
SMP08.
APPLICATION TIPS
All unused digital inputs should be connected to logic LOW
and unused analog inputs connected to analog ground. For
connector-driven analog inputs that may become temporarily
disconnected, a resistor to V
be used with a value ranging from 200 k to 1 M .
+15V
V
16
15
14
13
12
11
10
10
9
CC
R1
10k
10µF
+
C1
R2
1µF
C2
D1
10k
R2
10k
R2
DD
10k
R2
, V
SS
SS
A
< V
or analog ground should
= +25 C to +85 C. The
IN
< V
DD
) to avoid the
REV. D
SS
. In