LTC1052CH Linear Technology, LTC1052CH Datasheet - Page 12

• 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
OUTPUT CLAMP
If the LTC1052 is driven into saturation, the nulling loop,
attempting to force the differential input voltage to zero,
will drive C
saturating drive is removed, the capacitors take a finite
time to recover—this is the overload recovery time. The
overload recovery is longest when the capacitors are
driven to the negative rail (refer to Overload Recovery in
the Typical Performance Characteristics section). The
overload recovery time in this case is typically 225ms. In
the opposite direction (i.e., C
rail), it is about ten times faster (25ms). The overload
recovery time for the LTC1052 is much faster than com-
petitive devices; however, if a faster overload recovery
time is necessary, the output clamp function can be used.
When the output clamp is connected to the negative input
it prevents the amplifier from saturating, thus keeping
C
clamp is a switch that turns on when the output gets to
12
TYPICAL APPLICATIO S
EXTA
– IN
+ IN
5V
1N914
5V Powered Ultraprecision Instrumentation Amplifier
43k
and C
13
18
17
EXTA
6
7
EXTB
0.0047µF
LTC1043
5V
11
12
2
3
4
and C
at their nominal voltages. The output
1µF
C1
1µF
C3
U
14
15
16
8
5
EXTB
GAIN =
CMRR = >120dB DC – 20kHz
BANDWIDTH = 10Hz
1µF
CIRCUITRY WITHIN DASHED LINES MAY BE DELETED IF OUTPUT
DOES NOT HAVE TO SWING ALL THE WAY TO GROUND
DRIFT = 50nV/°C
V
C2
U
OS
+
= 3µV
R2
R1
to a supply rail. After the
100
EXTA
R1
C4
1µF
+ 1
U
0.1µF
W
and C
≈ – 0.5V
3
2
100k
R2
+
–
LTC1052
4
0.22µF
5V
1
7
EXTB
8
6
0.1µF
at positive
U
10k
V
LTC1052/7652 • TA03
OUT
within approximately 1V of either supply rail. This switch
is in parallel with the amplifier’s feedback resistor. As the
output moves closer to the rail, the switch on
resistance decreases, reducing the closed loop gain. The
output swing is reduced when the clamp function is used.
How much current the output clamp leaks when off
is important because, when used, it is connected to the
amplifier’s negative input. Any current acts like input bias
current and will degrade accuracy. At the other extreme,
the maximum current the clamp conducts when on deter-
mines how much overdrive the clamp will take, and still
keep the amplifier from saturating. Both of these numbers
are guaranteed in the Electrical Characteristics section.
LOW SUPPLY OPERATION
The minimum supply voltage for proper operation of the
LTC1052 is typically 4.0V (±2.0V). In single supply
applications, PSRR is guaranteed down to 4.7V (±2.35V).
This assures proper operation down to the minimum TTL
specified voltage of 4.75V.
INPUT
10k*
10k
0.1µF
2
3
10k
Fast Precision Inverter
+
–
LTC1052
1
*1% METAL FILM
300pF
FULL POWER BANDWIDTH = 2MHz
SLEW RATE = 40V/µs
SETTLING (10V STEP) = 12µs TO 0.01%
BIAS CURRENT DC = 30pA
OFFSET DRIFT = 50nV/°C
OFFSET VOLTAGE = 5µV
– 5V
5V
7
4
1N4148
8
6
0.1µF
10k
2
3
1000pF
+
–
LT318A
10k*
–5V
8pF
5V
7
4
6
LTC1052/7652 • TA04
OUTPUT
1052fa