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PDF LTC6417 Data sheet ( Hoja de datos )
| Número de pieza | LTC6417 | |
| Descripción | 1.6GHz Low Noise High Linearity Differential Buffer/16-Bit ADC Driver | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
n 1.6GHz –3dB Small Signal Bandwidth
n Low Distortion Driving 50Ω Load, 2.4VP-P Out
–100dBc/–69dBc HD2/HD3 at 140MHz
–80dBc IM3 and 46dBm OIP3 at 140MHz
–100dBc/–66dBc HD2/HD3 at 380MHz
–68dBc IM3 and 39dBm OIP3 at 380MHz
n 1.5nV/√Hz Output Noise
n 4.3pA/√Hz Input Current Noise
n Programmable High Speed, Fast Recovery
Output Clamping
n 4.28VP-P Maximum Output Swing on a 50Ω
Differential Load
n DC-Coupled Signal Path
n Operates on Single 4.75V to 5.25V Supply
n Power: 615mW on 5V, Can Be Reduced to 370mW,
Shutdown Mode 120mW
n 3mm × 4mm 20-Lead QFN Package
Applications
n Differential ADC Driver
n CCD Buffer
n Cable Driver
n 50Ω Buffer
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC6417
1.6GHz Low Noise High Linearity
Differential Buffer/16-Bit ADC
Driver with Fast Clamp
Description
The LTC®6417 is a differential unity gain buffer that can
drive a 50Ω load with extremely low noise and excellent
linearity. It is well suited for driving high speed 14- and
16-bit pipeline ADCs with input signals from DC to beyond
600MHz. Differential input impedance is 18.5kΩ, allowing
1:4 and 1:8 transformers to be used at the input providing
additional system gain in 50Ω systems.
With no external biasing or gain setting components and
a flow-through pinout, the LTC6417 is very easy to use. It
can be DC-coupled and has a common mode output offset
of –60mV. The LTC6417 input pins are internally biased to
provide an output common mode voltage that is set by
the voltage on the VCM pin for AC-coupled applications.
Supply current is typically 123mA and the LTC6417 operates
on supply voltages ranging from 4.75V to 5.25V. Power
consumption can be reduced to 74mA via the PWRADJ
pin. The LTC6417 also has a hardware shutdown feature
which reduces current consumption to 24mA.
The LTC6417 features fast, adjustable output voltage clamp-
ing to help protect subsequent circuitry. The CLHI pin sets
the maximum swing, while a symmetric minimum swing
is set up internally. LTC6417 VOR pin will signal overrange
when the clamps limit output voltage.
The LTC6417 is packaged in a 20-lead 3mm × 4mm QFN
package. Pinout is optimized for placement directly adjacent
to Linear Technology’s high speed 14- and 16-bit ADCs.
Typical Application
LTC6417 Driving an LTC2209 16-Bit ADC at 140MHz IF
5V
3.3V
50Ω
+–
680pF
0.1µF
1,6,
11,16
2.2µF
T1
WBC4-14LB
43
2
••
61
0.01µF
100Ω
100Ω
0.01µF
8
9
V+ 5
PWRADJ
2
IINN+–SLHTCD6NV4CC1ML7VHOI ROO1UU4TT+–1198
GND 12 15 1k
3, 7,10,
17, 20, 21
C43
27pF
E1
51nH
R36
60.4Ω
C41
12pF
R12
60.4Ω
C44
27pF
E2
51nH
2.2µF
E3
75nH
C45
18pF
E5
51nH
R42
300Ω
10Ω
C40
12pF
C10
12pF
R53
120Ω
R43
300Ω
10Ω
E3
75nH
C46
18pF
AIN+
LTC2209
16
AIN–
VCM PGA = 0
CLOCK
(153.6MHz)
6417 TA01a
LTC6417 Driving LTC2209
16-Bit ADC 32K Point FFT,
fIN = 140MHz, –1dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
HD2 = –88dBc
HD3 = –94dBc
SFDR = 88dBc
SNR = 75.4dB
SEE FIGURE 1/TABLE 1
1:4 BALUN
fS = 153.6Msps
DEMO BOARD DC1685A
10 20 30 40 50 60 70 80
FREQUENCY (MHz)
6417 TA01b
6417f
1
1 page  
LTC6417
DC Electrical Characteristics The l denotes the specifications which apply over the full operating
PtdeeWmfiRpnAeeDrdaJatus=re(VIN+r,a+nS–gHeIDN,N–o)t.=hVe0OrVwUuTisDneIlFeFsspisseocdtiehfifecirnawetiidosneassna(oOrteeUdaT.t+VT–IANOC=UM2T5i–s°)C.d.eSfVein+ee=DdC5aVts,eG(sItNNcD+ir+=cuI0NiVt–,s)N/c2ho.eRVmOLaOUtATiCDcM., CisLOdAeDfi=ne6dpFa.sV(COMU=T+1.+2O5VU,TC–L)/H2I.
= V+,
VINDIFF
is
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RPWRADJ
PWRADJ Pin Input Resistance
PWRADJ = 2.5V to 5.0V
10.5
l 10
14.5
19
20
kΩ
kΩ
VOR Pin
VOR(HI)
Maximum Voltage on VOR Pin
VCL = 5.0V, VCM = 1.25V
3.25 3.35 3.55
l 3.2
3.6
V
V
IOR(DEFAULT)
IOR(MAX)
Default Pull-Down Current on VOR Pin VCL = 50V, VCM = 1.25V
Maximum Pull-Down Current Both
Clamps are Active
VINC–L
=
=
2.0V,
0.1V
VCM
=
1.25V,
IN+
=
2.4V,
–900
l –1150
l
–770
1
–650
–500
1.5
2
µA
µA
µA
µA
AC Electrical Characteristics The l denotes the specifications which apply over the full operating
(tVeOCmUMTp=+er1+a.tO2u5UrVeT,–rC)a/Ln2Hg.IeV,=INoVDt+hIF,eFPriwWsiRsdeeAfDsinpJee=dciVafiCscCa(,ItNiSo+Hn–Ds NaINr=e–)0a.VtVTOuAUnT=leD2sIFs5F°oiCst.hdeVer+wfi=nise5edVnauosntel(eOds.UsVToI+Nth–CeMOrwUisTisd–ee).fniSnoeeteeddDa,sCG(NtIeNDs+t=+c0iIrVNc,u–R)it/L2sO.cAVhDeO=mUT5aC0tMi0cΩi.s,CdeLOfiAnDed=
6pF.
as
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Differential AC Characteristics
–3dBBW
0.1dBBW
0.5dBBW
1/f
–3dB Bandwidth
±0.1dB Bandwidth
±0.5dB Bandwidth
1/f Noise Corner
200mVP-P,OUT Differential
200mVP-P,OUT Differential
200mVP-P,OUT Differential
1.6 GHz
0.18 GHz
0.45 GHz
25 kHz
SR Slew Rate
Differential
10 V/ns
tS1%
tOFF
tON
tPWRADJ,OFF
tPWRADJ,ON
tCL,OFF 10%
1% Settling Time
Shutdown Time
Enable Time
PWRADJ Off Time
PWRADJ On Time
Clamp Release Time
tCL,ON 10% Clamp Engage Time
2VP-P,OUT
SHDN = 0V to 5V
SHDN = 5V to 0V
PWRADJ = 5V to 0V
PWRADJ = 0V to 5V
CLHI
IN– =
= 1.5V, VCM = 1.25V,
1.25V to 0.875V
IN+
=
1.625V
to
1.25V,
CLHI
IN– =
= 1.5V, VCM = 1.25V,
1.25V to 0.875V
IN+
=
1.25V
to
1.625V,
0.8 ns
40 ns
15 ns
10 ns
5 ns
1 ns
5 ns
Common Mode AC Characteristics (VCM Pin)
–3dBBW
VCM Pin Small Signal –3dB BW
SRCM
Common Mode Slew Rate
Overrange AC Characteristics (VOR Pin)
–3dBBW
VOR Pin Small Signal –3dB BW
SRVOR
Overrange Slew Rate
AC Clamping Characteristics
VCM = 0.1VP-P, Measured Single-Ended at Output
Measured Single-Ended at Output
RVOVROR==01.1kV, PM-Pe,aCsLuHreId=S2inV,gIlNe-+E=nd2e.d4Va,tINO–ut=pu0t.1V,
Measured Single-Ended at Output
10 MHz
2 V/µs
200 MHz
40 V/µs
tOVDR
Overdrive Recovery Time
1.9VP-P,OUT
2 ns
6417f
5
5 Page 
Typical Performance Characteristics
OIP3 at 70MHz
vs VCM Over Temperature
55
50 –40°C
25°C
45
40
85°C
35 105°C
30
POUT = 5dBm/TONE
∆FREQ = 1MHz
25
0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65
VCM (V)
6417 G28
OIP3 at 100MHz
vs VCM Over Temperature
55
50 –40°C
25°C
45
40 105°C
35 85°C
30
POUT = 5dBm/TONE
∆FREQ = 1MHz
25
0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65
VCM (V)
6417 G31
OIP3 at 140MHz
vs VCM Over Temperature
55 POUT = 5dBm/TONE
∆FREQ = 1MHz
50
25°C
–40°C
45
40
85°C
35
105°C
30
25
0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65
VCM (V)
6417 G34
OIP3 at 70MHz vs VCM Over V+
55
POUT = 5dBm/TONE
∆FREQ = 1MHz
50
45
40
35
30
VV++
=
=
4.75V
5.0V
V+ = 5.25V
25
0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65
VCM (V)
6417 G29
OIP3 at 100MHz vs VCM Over V+
55
POUT = 5dBm/TONE
∆FREQ = 1MHz
50
45
40
35
30
V+ = 4.75V
VV++
=
=
5.0V
5.25V
25
0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65
VCM (V)
6417 G32
OIP3 at 140MHz vs VCM Over V+
55
POUT = 5dBm/TONE
∆FREQ = 1MHz
50
45
40
35
30
V+ = 4.75V
VV++
=
=
5.0V
5.25V
25
0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65
VCM (V)
6417 G35
LTC6417
OIP3 at 70MHz
vs PWRADJ Over Temperature
55
–40°C
50
45 25°C
40
35
85°C
105°C
30
POUT = 5dBm/TONE
∆FREQ = 1MHz
25
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
PWRADJ (V)
6417 G30
OIP3 at 100MHz
vs PWRADJ Over Temperature
55
–40°C
50
45 25°C
40
35
85°C
105°C
30
POUT = 5dBm/TONE
∆FREQ = 1MHz
25
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
PWRADJ (V)
6417 G33
OIP3 at 140MHz
vs PWRADJ Over Temperature
55
50 105°C
45
85°C
40
35
25°C
–40°C
30
POUT = 5dBm/TONE
∆FREQ = 1MHz
25
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
PWRADJ (V)
6417 G36
6417f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC6417.PDF ] | |
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