SMP04EPZ Analog Devices Inc, SMP04EPZ Datasheet - Page 12

• Manufacturer Part Number: SMP04EPZ
• Description: IC AMP SAMPLE HOLD CMOS 16DIP
• Manufacturer: Analog Devices Inc

Specifications of SMP04EPZ

• Amplifier Type: Sample and Hold
• Number Of Circuits: 4
• Slew Rate: 4 V/µs
• Current - Input Bias: 500nA
• Voltage - Input Offset: 2500µV
• Current - Supply: 4mA
• Current - Output / Channel: 1.2mA
• Voltage - Supply, Single/dual (±): 5 V ~ 12 V, ±2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• No. Of Amplifiers: 4
• Bandwidth: 85kHz
• Acquisition Time: 9µs
• Input Offset Voltage: 2.5mV
• Settling Time: 3.5µs
• Supply Voltage Range: 10.8V To 13.2V, ± 5V To ± 6V
• Amplifier Case Style: DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

SMP04
SAMPLE AND DIFFERENCE AMPLIFIER (Figure 23)
This circuit uses two sample-and-holds to measure the voltage
difference of a signal between two time points, t
sampled voltages are fed into the differential inputs of the AMP02
instrumentation amplifier. A single resistor R
this instrumentation amplifier. Using two channels of the
SMP04 in this application has the advantage of matched
sample-and-hold performance, since they are both on the same
chip.
0
0
+ INPUT
– INPUT
S/H
t
1
Figure 24. +12 V Single Supply Sampling Instrumentation Amplifier with Guard Drive
t
d
t
2
V
V
1
2
GUARD
DRIVE
V
S/H
S/H (DELAYED)
GUARD
GUARD
IN
(0V TO 8V)
Figure 23. Time Delta Sample-and-Difference Measurement
G
1/2 SMP04
sets the gain of
1
SMP04
SMP04
and t
1/4
1/4
SMP04
+12V
V
DD
+12V
1/4
2
. The
DGND
V
V
SS
SS
–12–
+12V
V
SINGLE SUPPLY, SAMPLING, INSTRUMENTATION
AMPLIFIER (Figure 24)
This application again uses two channels of the SMP04 and an
instrumentation amplifier to provide a sampled difference signal.
The sample-and-hold signals in this circuit are tied together to
sample at the same point in time. The other two parts of the
SMP04 are used as amplifiers by grounding their control lines
so they are always sampling. One section is used to drive a
guard to the common-mode voltage and the other to generate a
+6 V reference to serve as an offset for single supply operation.
SS
20k
20k
0.01 F
50k
50k
V
R
V
1
G
2
INSTRUMENTATION AMP
SMP04
1/4
–5V OR –12V
R
AMP02
G
+12V
AMP02
+12V
REFERENCE
+6V REFERENCE
GAIN =
0.1 F
V
G =
OUT
50k
50k
= G(V1–V2)
R
R
G
G
V
+1
+1
OUT
REV. D