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參數(shù)資料
型號: LT6231CS8#TRPBF
廠商: Linear Technology
文件頁數(shù): 17/24頁
文件大小: 0K
描述: IC OP AMP DUAL LP 3.4MA 8-SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 通用
電路數(shù): 2
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 70 V/µs
增益帶寬積: 215MHz
電流 - 輸入偏壓: 5µA
電壓 - 輸入偏移: 50µV
電流 - 電源: 3.3mA
電流 - 輸出 / 通道: 30mA
電壓 - 電源,單路/雙路(±): 3 V ~ 12.6 V,±1.5 V ~ 6.3 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: 帶卷 (TR)
LT6230/LT6230-10
LT6231/LT6232
24
623012fc
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2003
LT 0111 REV C PRINTED IN USA
relaTeD parTs
Typical applicaTions
The LT6230 is applied as a transimpedance amplifier with
an I-to-V conversion gain of 1.5kΩ set by R1. The LT6230
is ideally suited to this application because of its low
input offset voltage and current, and its low noise. This is
because the 1.5k resistor has an inherent thermal noise
of 5nV/√Hz or 3.4pA/√Hz at room temperature, while the
LT6230 contributes only 1.1nV and 2.4pA /√Hz. So, with
respect to both voltage and current noises, the LT6230 is
actually quieter than the gain resistor.
The circuit uses an avalanche photodiode with the cathode
biased to approximately 200V. When light is incident on
the photodiode, it induces a current IPD which flows into
the amplifier circuit. The amplifier output falls negative
to maintain balance at its inputs. The transfer function
is therefore VOUT = –IPD 1.5k. C1 ensures stability and
good settling characteristics. Output offset was measured
at 280V, so low in part because R2 serves to cancel the
DC effects of bias current. Output noise was measured
at 1.1mVP-P on a 100MHz measurement bandwidth, with
C2 shunting R2’s thermal noise. As shown in the scope
photo, the rise time is 17ns, indicating a signal bandwidth
of 20MHz.
Low Power Avalanche Photodiode Transimpedance Amplifier
IS = 3.3mA
+
R1
1.5k
R2
1.5k
C2
0.1F
5V
–5V
ENABLE
LT6230
≈200V BIAS
ADVANCED PHOTONIX
012-70-62-541
WWW.ADVANCEDPHOTONIX.COM
623012 TA02a
C1
4.7pF
OUTPUT OFFSET = 500V TYPICAL
BANDWIDTH = 20MHz
OUTPUT NOISE = 1.1mVP-P (100MHz MEASUREMENT BW)
Photodiode Amplifier Time Domain Response
50ns/DIV
623012 TA02b
30mV
/DIV
PART NUMBER
DESCRIPTION
COMMENTS
LT1028
Single, Ultralow Noise 50MHz Op Amp
0.85nV/√Hz
LT1677
Single, Low Noise Rail-to-Rail Amplifier
3V Operation, 2.5mA, 4.5nV/√Hz, 60V Max VOS
LT1806/LT1807
Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier
2.5V Operation, 550V Max VOS, 3.5nV/√Hz
LT6200/LT6201
Single/Dual, Low Noise 165MHz
0.95nV√Hz, Rail-to-Rail Input and Output
LT6202/LT6203/LT6204
Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier
1.9nV/√Hz, 3mA Max, 100MHz Gain Bandwidth
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