LT1128 Linear Technology Corporation, LT1128 Datasheet - Page 12

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LT1128

Manufacturer Part Number
LT1128
Description
Ultra Low Noise Precision High Speed Op Amps
Manufacturer
Linear Technology Corporation
Datasheet

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LT1028/LT1128
Noise Testing – Current Noise
Current noise density (I
formula, and can be measured in the circuit shown:
If the Quan Tech Model 5173 is used, the noise reading is
input-referred, therefore the result should not be divided
by 31; the resistor noise should not be multiplied by 31.
100% Noise Testing
The 1kHz voltage and current noise is 100% tested on the
LT1028/LT1128 as part of automated testing; the approxi-
mate frequency response of the filters is shown. The limits
on the automated testing are established by extensive
correlation tests on units measured with the Quan Tech
Model 5173.
A
General
The LT1028/LT1128 series devices may be inserted di-
rectly into OP-07, OP-27, OP-37, LT1007 and LT1037
sockets with or without removal of external nulling com-
ponents. In addition, the LT1028/LT1128 may be fitted to
5534 sockets with the removal of external compensation
components.
Offset Voltage Adjustment
The input offset voltage of the LT1028/LT1128 and its drift
with temperature, are permanently trimmed at wafer test-
ing to a low level. However, if further adjustment of V
necessary, the use of a 1k nulling potentiometer will not
degrade drift with temperature. Trimming to a value other
A
12
PPLICATI
PPLICATI
I
n
=
[e
no
2
– (31 18.4nV/ Hz)
60
O
O
20k 31
U
U
10k
10k
S
S
n
+
I FOR ATIO
I FOR ATIO
) is defined by the following
LT1028
LT1128
U
U
1.8k
2
1028/1128 AI04
W
W
]
1/2
e
no
U
U
– OISE
OS
U
is
10Hz voltage noise density is sample tested on every lot.
Devices 100% tested at 10Hz are available on request for
an additional charge.
10Hz current noise is not tested on every lot but it can be
inferred from 100% testing at 1kHz. A look at the current
noise spectrum plot will substantiate this statement. The
only way 10Hz current noise can exceed the guaranteed
limits is if its 1/f corner is higher than 800Hz and/or its
white noise is high. If that is the case then the 1kHz test will
fail.
than zero creates a drift of (V
adjusted to 300 V, the change in drift will be 1 V/ C.
The adjustment range with a 1k pot is approximately
Offset Voltage and Drift
Thermocouple effects, caused by temperature gradients
across dissimilar metals at the contacts to the input
1.1mV.
–20
–30
–40
–50
–10
10
0
100
INPUT
Automated Tester Noise Filter
2
3
+
LT1028
LT1128
1
1k
FREQUENCY (Hz)
–15V
CURRENT
4
1k
8
NOISE
OS
7
/300) V/ C, e.g., if V
6
10k
VOLTAGE
NOISE
1028/1128 AI06
LT1028/1128 • AI05
15V
OUTPUT
100k
OS
is

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