LTC1052CH Linear Technology, LTC1052CH Datasheet - Page 10

• Manufacturer Part Number: LTC1052CH
• Description: LOW NOISE CHOPPER STAB OA
• Manufacturer: Linear Technology
• Series: LTCMOS™r

Specifications of LTC1052CH

• Amplifier Type: Chopper (Zero-Drift)
• Number Of Circuits: 1
• Slew Rate: 4 V/µs
• Gain Bandwidth Product: 1.2MHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 0.5µV
• Current - Supply: 1.7mA
• Voltage - Supply, Single/dual (±): 4.75 V ~ 16 V, ±2.38 V ~ 8 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: TO-5-8
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -

APPLICATIO S I FOR ATIO
LTC1052/LTC7652
When all of these errors are considered, it may seem
impossible to take advantage of the extremely low drift
specifications of the LTC1052. To show that this is not the
case, examine the temperature test circuit of Figure 3. The
lead lengths of the resistors connected to the amplifier’s
inputs are identical. The thermal capacity and thermal
resistance each input sees is balanced because of the
symmetrical connection of resistors and their identical
size. Thermal EMF-induced shifts are equal in phase and
amplitude, thus cancellation occurs.
10
0.1µF
Figure 3. Offset Drift Test Circuit
100Ω
50k
U
Figure 4. Transient Response of Offset Drift Test Circuit with 100°C Temperature Step
10
10
0.1µF
U
0
0
2
3
–5V
–
+
OVEN SWITCHED
LTC1052
ON (25°C)
50k
1
0 MIN
5V
7
4
W
8
0.1µF
6
LTC1052/7652 • AI04
V
OS
• 1000
U
5 MIN
25°C TO 125°C
25°C TO 125°C
METAL CAN
PLASTIC
Figure 4 shows the response of this circuit under
temperature transient conditions. Metal film resistors and
an 8-pin DIP socket were used. Care was taken in the
construction to thermally balance the inputs to the
amplifier. The units were placed in an oven and allowed to
stabilize at 25°C. The recording was started and after
100 seconds the oven, preset to 125°C, was switched on.
The test was first performed on an 8-pin plastic package
and then was repeated for a TO-5 package plugged into the
same test board. It is significant that the change in V
even under these severe thermal transient conditions,
is quite good. As temperature stabilizes, note that the
steady-state change of V
±0.05µV/°C drift specification.
Very slight air currents can still affect even this
arrangement. Figure 5 shows strip charts of output noise
both with the circuit covered and with no cover in “still” air.
This data illustrates why it is often prudent to enclose the
LTC1052 and its attendant components inside some form
of thermal baffle.
OVEN STABILIZED
100 SECONDS/IN
AT 12 MIN
20 MIN
25 MIN
OS
±0.05µV/°C
±0.05µV/°C
is well within the maximum
1052fa
OS
,