- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377717 > LT1994 (Linear Technology Corporation) 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF PDF資料下載
參數(shù)資料
| 型號： | LT1994 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| 中文描述： | 1.3GHz的低噪聲，低失真差分ADC驅(qū)動器為140MHz的中頻 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 232K |
| 代理商： | LT1994 |
LTC6401-20
11
640120f
two outputs have the same gain and thus symmetrical
swing. In general, the single-ended input impedance and
termination resistor R
T
are determined by the combination
of R
S
, R
G
and R
F
. For example, when R
S
is 50
Ω
, it is found
that the single-ended input impedance is 200
Ω
and R
T
is
66.5
Ω
in order to match to a 50
Ω
source impedance.
The LTC6401-20 is unconditionally stable. However, the
overall differential gain is affected by both source imped-
ance and load impedance as shown in Figure 4:
The noise performance of the LTC6401-20 also depends
upon the source impedance and termination. For example,
an input 1:4 balun transformer in Figure 2 improves SNR
by adding 6dB of gain at the inputs. A trade-off between
gain and noise is obvious when constant noise figure
circle and constant gain circle are plotted within the same
A
V
V
R
R
+
R
V
OUT
IN
S
L
L
=
=
+
2000
200 25
Figure 4. Calculate Differential Gain
input Smith Chart, based on which users can choose the
optimal source impedance for a given gain and noise
requirement.
Output Match and Filter
The LTC6401-20 can drive an ADC directly without
external output impedance matching. Alternatively, the
differential output impedance of 25
Ω
can be matched to
higher value impedance, e.g. 50
Ω
, by series resistors or
an LC network.
The internal low pass filter outputs at +OUTF/–OUTF
have a –3dB bandwidth of 590MHz. External capacitor
can reduce the low pass filter bandwidth as shown in
Figure 5. A bandpass filter is easily implemented with
only a few components as shown in Figure 6. Three
39pF capacitors and a 16nH inductor create a bandpass
filter with 165MHz center frequency, –3dB frequencies at
138MHz and 200MHz.
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50
Ω
Input
Impedance
Figure 5. LTC6401-20 Internal Filter Topology Modified for Low
Filter Bandwidth (Three External Capacitors)
640120 F03
IN+
OUT–
IN–
OUT+
100
Ω
R
T
66.5
Ω
0.1
μ
F
0.1
μ
F
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
R
S
50
Ω
R
S
50
Ω
V
IN
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
0.1
μ
F
R
T
66.5
Ω
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F04
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1/2 R
S
1/2 R
S
V
IN
V
OUT
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
1/2 R
L
1/2 R
L
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F05
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
8.2pF
8.2pF
12pF(87.5MHz)
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
Figure 6. LTC6401-20 Application Circuit for Bandpass
Filtering (Three External Capacitors, One External Inductor)
LTC2208
10
Ω
10
Ω
4.99
Ω
4.99
Ω
39pF
16nH
39pF
39pF
640120 F06
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC6400-20 | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6401-20 | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6401CUD-20PBF | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6401CUD-20TRPBF | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6401IUD-20PBF | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1994CDD | 制造商:Linear Technology 功能描述:SC-Amps/High Speed, 70MHz Low Noise/Distortion Differential Amplifer |
| LT1994CDD#PBF | 功能描述:IC DIFF AMP/DRIVER LN 8-DFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:RF/IF 差分 電路數(shù):1 輸出類型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應(yīng)商設(shè)備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| LT1994CDD#PBF | 制造商:Linear Technology 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Linear Technology 功能描述:IC, DIFFERENTIAL AMP, 70MHZ, 65V/ uS DFN8 |
| LT1994CDD#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 70MHZ, 65V/US, DFN-8, No. of Amplifiers:1, Input Offset Voltage: 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 70MHZ, 65V/US, DFN-8, No. of Amplifiers:1, Input Offset Voltage:2mV, Bandwidth:70MHz, Amplifier Case Style:DFN, No. of Pins:8, Supply Voltage Range:2.375V to 12.6V, Slew Rate:65V/s, Supply Current:14.8mA, MSL:- , RoHS Compliant: No |
| LT1994CDD#TRPBF | 功能描述:IC DIFF AMP/DRIVER LN 8-DFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。