VREF + OVERDRIVE " />
參數(shù)資料
型號: LTC1052CSW#PBF
廠商: Linear Technology
文件頁數(shù): 21/24頁
文件大?。?/td> 0K
描述: IC OPAMP CHOP-STBL LONOIS16SOIC
標(biāo)準(zhǔn)包裝: 47
系列: LTCMOS™
放大器類型: 斷路器(零漂移)
電路數(shù): 1
轉(zhuǎn)換速率: 4 V/µs
增益帶寬積: 1.2MHz
電流 - 輸入偏壓: 1pA
電壓 - 輸入偏移: 0.5µV
電流 - 電源: 1.7mA
電壓 - 電源,單路/雙路(±): 4.75 V ~ 16 V,±2.38 V ~ 8 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SO
包裝: 管件
LTC1052/LTC7652
6
1052fa
50V
10V
5V
Response Time vs Overdrive
VREF + OVERDRIVE
20ms/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
UW
OUTPUT
–5V
5V
VREF – 1mV
INPUT
{
Electrical Characteristics Test Circuit (TC1)
DC to 10Hz and DC to 1HZ Noise Test Circuit (TC3)
THEORY OF OPERATIO
U
DC OPERATION
The shaded portion of the LTC1052 block diagram
(Figure 1a) entirely determines the amplifier’s DC
characteristics. During the auto zero portion of the cycle,
the gm1 inputs are shorted together and a feedback path is
closed around the input stage to null its offset. Switch S2
and capacitor CEXTA act as a sample-and-hold to store the
nulling voltage during the next step—the sampling cycle.
In the sampling cycle, the zeroed amplifier is used to
amplify the differential input voltage. Switch S2 connects
the amplified input voltage to CEXTB and the output gain
stage. CEXTB and S2 act as a sample-and-hold to store the
amplified input signal during the auto zero cycle.
By switching between these two states at a frequency
much higher than the signal frequency, a continuous
output results.
Notice that during the auto zero cycle the gm1 inputs are
not only shorted together, but are also shorted to the
inverting input. This forces nulling with the common mode
voltage present and accounts for the extremely high
CMRR of the LTC1052. In the same fashion, variations in
0.1F
R1
1k
R2
1M
3
2
7
6
8
4
1
V
V+
+
LTC1052
LTC1052/7652 TC01
OUTPUT
RL
TEST CIRCUITS
0.1F
6
R2
3
2
7
6
8
4
1
V
V+
+
LTC1052
LTC1052/7652 TC02
OUTPUT
(NOISE x 20,000)
34k
R1
C2
3
2
+
LT1001
34k
C3
R4
R3
BANDWIDTH
10Hz
1Hz
R1
16.2
R2
162k
R3
16.2k
162k
R4
16.2k
162k
C2
0.1F
1.0F
C3
1.0F
C4
1.0F
C4
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