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參數(shù)資料
| 型號(hào)： | LTC6401IUD-26#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DIFF 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | ADC 驅(qū)動(dòng)器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
LTC6401-26
11
640126f
The LTC6401-26 is unconditionally stable, i.e. differential
stability factor Kf>1 and stability measure B1>0. However,
the overall differential gain is affected by both source
impedance and load impedance as shown in Figure 4:
A
V
VR
R
V
OUT
IN
S
L
==
++
1000
50 25
The noise performance of the LTC6401-26 also depends
upon the source impedance and termination. A trade-off
between gain and noise is obvious when constant noise
gure circle and constant gain circle are plotted within
the same input Smith Chart, based on which users can
choose the optimal source impedance for a given gain
and noise requirement.
Output Impedance Match and Filter
The LTC6401-26 can drive an ADC directly without external
output impedance matching. Alternatively, the differential
output impedance of 25Ω can be made larger, e.g. 50Ω,
by series resistors or LC network.
Figure 4. Calculate Differential Gain
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50Ω Input
Impedance
The internal low pass lter outputs at +OUTF/–OUTF have
a –3dB bandwidth of 590MHz. External capacitors can
reduce the low pass lter bandwidth as shown in Figure
5. A bandpass lter is easily implemented with only a
few components as shown in Figure 6. Three 39pF ca-
pacitors and 16nH inductor create a bandpass lter with
165MHz center frequency, –3dB frequencies at 138MHz
and 200MHz.
Output Common Mode Adjustment
The LTC6401-26’s output common mode voltage is set
by the VOCM pin, which is a high impedance input. The
output common mode voltage is capable of tracking VOCM
in a range from 1V to 1.6V. Bandwidth of VOCM control is
typically 15MHz, which is dominated by a low pass lter
connected to the VOCM pin and is aimed to reduce com-
mon mode noise generation at the outputs. The internal
common mode feedback loop has a –3dB bandwidth of
400MHz, allowing fast rejection of any common mode
output voltage disturbance. The VOCM pin should be tied
to a DC bias voltage with a 0.1μF bypass capacitor. When
interfacing with 3V A/D converters such as the LTC22xx
families, the VOCM pin can be connected to the VCM pin
of the ADC.
Driving A/D Converters
The LTC6401-26 has been specically designed to interface
directly with high speed A/D converters. Figure 7 shows the
LTC6401-26 with single-ended input driving the LTC2208,
which is a 16-bit, 130Msps ADC. Two external 5Ω resistors
help eliminate potential resonance associated with bond
wires of either the ADC input or the driver output. VOCM
Figure 5. LTC6401-26 Internal Filter Topology Modied for Low
Filter Bandwidth (Three External Capacitors)
640126 F03
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25
Ω
RT
150
Ω
0.1
μF
0.1
μF
12.5
Ω
500
Ω
LTC6401-26
25
Ω
RS
50
Ω
VIN
500
Ω
12.5
Ω
50
Ω
50
Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
0.1
μF
37.4
Ω
640126 F04
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25
Ω
12.5
Ω
500
Ω
LTC6401-26
25
Ω
1/2 RS
VIN
VOUT
500
Ω
12.5
Ω
50
Ω
50
Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1/2 RL
640126 F05
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25
Ω
12.5
Ω
500
Ω
LTC6401-26
25
Ω
500
Ω
12.5
Ω
50
Ω
50
Ω
2.7pF
13
14
15
16
7
5
6
8
8pF
12pF
FILTERED OUTPUT
(87.5MHz)
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參數(shù)描述 |
|---|---|
| LTC6401IUD-8#PBF | 功能描述:IC ADC DRIVER DIFF 16-QFN RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6401IUD-8#TRPBF | 功能描述:IC ADC DRIVER DIFF 16-QFN RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6401IUD-8-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| LTC6401IUD-8-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| LTC6403-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:200MHz, Low Noise, Low Power Fully Differential Input/Output Amplifi er/Driver |
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