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參數(shù)資料
| 型號： | LT1793IS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP PREC JFET LOWNOIS 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 3.4 V/µs |
| 增益帶寬積： | 4.2MHz |
| 電流 - 輸入偏壓： | 4pA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 4.2mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 20 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
7
LT1793
CC
HARA TERISTICS
UW
A
TYPICALPERFOR
CE
Short-Circuit Output Current
vs Temperature
TEMPERATURE (
°C)
–75
10
OUTPUT
CURRENT
(mA)
15
20
25
30
–25
50
25
100
1793 G19
35
40
–50
0
75
125
SINK
SOURCE
VS = ±15V
Supply Current vs Temperature
TEMPERATURE (
°C)
–75
3
SUPPLY
CURRENT
PER
AMPLIFIER
(mA)
4
–25
50
25
100
1793 G20
5
–50
0
75
125
VS = ±15V
VS = ±5V
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
LT1793 vs the Competition
With improved noise performance, the LT1793 in the
PDIP directly replaces such JFET op amps as the OPA111
and the AD645. The combination of low current and
voltage noise of the LT1793 allows it to surpass most dual
and single JFET op amps. The LT1793 can replace many
of the lowest noise bipolar amps that are used in amplify-
ing low level signals from high impedance transducers.
The best bipolar op amps (with higher current noise) will
eventually lose out to the LT1793 when transducer im-
pedance increases.
Figure 1. Comparison of LT1793, OP215, and AD822
Input Bias Current vs Common Mode Range
COMMON MODE RANGE (V)
–15
–100
INPUT
BIAS
CURRENT
(pA)
–60
–40
–20
0
20
40
–10
–5
05
1793 F01
10
60
80
100
–80
15
LT1793
AD822
CURRENT NOISE =
√2qIB
OP215
TEMPERATURE (
°C)
0
INPUT
BIAS
AND
OFFSET
CURRENTS
(A)
300p
100p
3n
1n
30n
10n
100
1793 G21
30p
10p
3p
1p
0.3p
25
50
75
125
VS = ±15V
VCM = –10 TO 13V
BIAS
CURRENT
OFFSET
CURRENT
Input Bias and Offset Currents
vs Chip Temperature
The extremely high input impedance (1013
) assures that
the input bias current is almost constant over the entire
common mode range. Figure 1 shows how the LT1793
stands up to the competition. Unlike the competition, as the
input voltage is swept across the entire common mode
range the input bias current of the LT1793 hardly changes.
As a result the current noise does not degrade. This makes
the LT1793 the best choice in applications where an
amplifier has to buffer signals from a high impedance
transducer.
Offset nulling will be compatible with these devices with the
wiper of the potentiometer tied to the negative supply
(Figure 2a). No appreciable change in offset voltage drift
2
3
1
5
VOS = ±13mV
50k
15V
– 15V
4
6
7
–
+
2
3
1
5
VOS = ±1.3mV
50k
10k
15V
– 15V
(b)
(a)
1793 F02
4
6
7
–
+
Figure 2
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