LINEAR TECHNOLOGY LT6411 Technical data
LT6411
650MHz Differential ADC
Driver/Dual Selectable
Gain Amplifi er
FEATURES
■
650MHz –3dB Small-Signal Bandwidth
■
600MHz –3dB Large-Signal Bandwidth
■
High Slew Rate: 3300V/µs
■
Easily Confi gured for Single-Ended to Differential
Conversion
■
200MHz ±0.1dB Bandwidth
■
User Selectable Gain of +1, +2 and –1
■
No External Resistors Required
■
46.5dBm Equivalent OIP3 at 30MHz When Driving an
ADC
■
IM3 with 2V
–87dBc at 30MHz, –83dBc at 70MHz
■
–77dB SFDR at 30MHz, 2V
■
6ns 0.1% Settling Time for 2V Step
■
Low Supply Current: 8mA per Ampifi er
■
Differential Gain of 0.02%, Differential Phase of 0.01°
■
50dB Channel Separation at 100MHz
■
Wide Supply Range: ±2.25V (4.5V) to ±6.3V (12.6V)
■
3mm × 3mm 16-Pin QFN Package
Composite, Differential Output:
P-P
Differential Output
P-P
DESCRIPTION
The LT®6411 is a dual amplifi er with individually selectable
gains of +1, +2 and –1. The amplifi ers have excellent distortion performance for driving ADCs as well as excellent
bandwidth and slew rate for video, data transmission and
other high speed applications. Single-ended to differential
conversion with a system gain of 2 is particularly straightforward by confi guring one amplifi er with a gain of +1
and the other amplifi er with a gain of –1. The LT6411 can
be used on split supplies as large as ±6V and on a single
supply as low as 4.5V.
Each amplifi er draws only 8mA of quiescent current when
enabled. When disabled, the output pins become high
impedance and each amplifi er draws less than 350µA.
The LT6411 is manufactured on Linear Technology’s
proprietary, low voltage, complimentary, bipolar process
and is available in the ultra-compact, 3mm × 3mm, 16pin
QFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS
■
Differential ADC Driver
■
Single-Ended to Differential Conversion
■
Differential Video Line Driver
TYPICAL APPLICATION
Differential ADC Driver
5V
V
CC
1.9V
1.9V
DC
30MHz
INPUT
DC
LT6411
DGND
EN
+
–
370Ω 370Ω
370Ω 370Ω
–
+
V
EE
24Ω
24Ω
A
IN
A
IN
–
LTC2249
14-BIT ADC
80Msps
+
6411 TA01a
30MHz 2-Tone 32768 Point FFT, LT6411
Driving an LTC®2249 14-Bit ADC
0
32768 POINT FFT
–10
TONE 1 AT 29.5MHz, –7dBFS
–20
TONE 2 AT 30.5MHz, –7dBFS
–30
IM3 = –87dBc
–40
–50
–60
–70
–80
–90
AMPLITUDE (dBFS)
–100
–110
–120
–130
–140
10
5
0
FREQUENCY (MHz)
25
20 40
15
30 35
6411 TA01b
6411f
1
LT6411
(Note 1)
Total Supply Voltage (VCC to VEE) ..........................12.6V
Input Current (Note 2) ..........................................±10mA
Output Current (Continuous) ...............................±70mA
EN to DGND Voltage (Note 2) ..................................5.5V
Output Short-Circuit Duration (Note 3) ............ Indefi nite
Operating Temperature Range (Note 4) ... –40°C to 85°C
Specifi ed Temperature Range (Note 5) ....–40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
Junction Temperature ........................................... 125°C
PACKAGE/ORDER INFORMATIONABSOLUTE MAXIMUM RATINGS
TOP VIEW
IN2+IN2–IN1–IN1
16
1
V
EE
2
V
EE
3
V
EE
4
NC
5678
OUT2
16-LEAD (3mm × 3mm) PLASTIC QFN
T
JMAX
EXPOSED PAD (PIN 17) IS V
UD PACKAGE
= 125°C, θJA = 68°C/W, θJC = 4.2°C/W
ORDER PART NUMBER UD PART MARKING*
+
15 14
13
12
DGND
11
17
CC
V
V
, MUST BE SOLDERED TO PCB
EE
EN
10
V
CC
9
VCC
EE
OUT1
LT6411CUD
LT6411IUD
LCGP
LCGP
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
*Temperature grade is identifi ed by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
The
temperature range, otherwise specifi cations are at T
= 25°C. VS = ±5V, AV = 2, RL = 150Ω, CL = 1.5pF, VEN = 0.4V, V
A
●
denotes the specifi cations which apply over the full operating
= 0V,
DGND
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
I
R
C
V
OS
IN
IN
IN
CMR
Input Referred Offset Voltage VIN = 0V, VOS = V
Input Current
Input Resistance VIN = ±1V
Input Capacitance f = 100kHz 1 pF
Maximum Input Common Mode Voltage
Minimum Input Common Mode Voltage
PSRR Power Supply Rejection Ratio V
I
PSRR
ERR Gain Error V
A
V
A
MATCH Gain Matching V
V
V
OUT
I
S
Input Current Power Supply Rejection VS (Total) = 4.5V to 12V (Note 6)
Maximum Output Voltage Swing RL = 1k
Supply Current, Per Amplifi er
Supply Current, Disabled, per Amplifi er V
I
EN
Enable Pin Current VEN = 0.4V
(Total) = 4.5V to 12V (Note 6)
S
= ±2V
OUT
= ±2V ±1 %
OUT
R
= 150Ω
L
R
= 150Ω
L
= 4V
EN
V
= Open
EN
+
= V
V
EN
OUT
/2
●
●
●
150 500 kΩ
●
56 62 dB
●
●
±3.70
±3.25
●
±3.10
3 ±10
±20
–17 ±50 µA
V
– 1
CC
+ 1
V
EE
1 ±4 µA/V
–1.2 ±5 %
±3.95
±3.6
mV
mV
81114mA
●
●
●
●
–200 –95
●
22
0.5
350
350
0.5 50
mA
µA
µA
µA
µA
6411f
V
V
V
V
V
2
LT6411
ELECTRICAL CHARACTERISTICS
The
temperature range, otherwise specifi cations are at T
= 25°C. VS = ±5V, AV = 2, RL = 150Ω, CL = 1.5pF, VEN = 0.4V, V
A
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
SC
SR Slew Rate ±1V on ±2V Output Step (Note 9) 1700 3300 V/µs
–3dB BW Small-Signal –3dB Bandwidth V
0.1dB BW Gain Flatness ±0.1dB Bandwidth V
FPBW Full Power Bandwidth 2V Differential V
t
s
, t
t
r
f
dG Differential Gain (Note 8) 0.02 %
dP Diffi erential Phase (Note 8) 0.01 Deg
Output Short-Circuit Current RL = 0Ω, VIN = ±1V
= 200mV
OUT
= 200mV
OUT
= 2V
OUT
Full Power Bandwidth 2V V
Full Power Bandwidth 4V V
OUT
OUT
= 2V
= 4V
All Hostile Crosstalk f = 10MHz, V
f = 100MHz, V
Settling Time 0.1% to V
Small-Signal Rise and Fall Time 10% to 90%, V
●
denotes the specifi cations which apply over the full operating
= 0V,
DGND
●
±50 ±105 mA
, Single Ended 650 MHz
P-P
, Single Ended 200 MHz
P-P
Differential, –3dB 600 MHz
P-P
(Note 7) 270 525 MHz
P-P
(Note 7) 263 MHz
P-P
OUT
FINAL
= 2V
P-P
= 2V
OUT
P-P
, V
= 2V 6 ns
STEP
= 200mV
OUT
P-P
–75
–50
550 ps
dB
dB
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C.
= 5V, VEE = 0V, AV = 2, No R
V
CC
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Noise/Harmonic Performance Input/Output Characteristics
1MHz Signal
HD Second/Third Harmonic Distortion 2V
IMD3
OIP3
Third-Order IMD 2V
1M
Output Third-Order Intercept Differential, f1 = 0.95MHz, f2 = 1.05MHz (Note 10) 49.5 dBm
1M
NF Noise Figure Single Ended 25.1 dB
e
n1M
Input Referred Noise Voltage Density 8 nV/√Hz
P1dB 1dB Compression Point (Note 10) 19.5 dBm
10MHz Signal
HD Second/Third Harmonic Distortion 2V
IMD3
OIP3
Third-Order IMD 2V
10M
Output Third-Order Intercept Differential, f1 = 9.5MHz, f2 = 10.5MHz (Note 10) 49 dBm
10M
NF Noise Figure Single Ended 24.7 dB
e
n10M
Input Referred Noise Voltage Density 7.7 nV/√Hz
P1dB 1dB Compression Point (Note 10) 19.5 dBm
, VEN = 0.4V, V
LOAD
= 0V, unless otherwise noted.
DGND
Differential
P-P
2V
Differential, RL = 200Ω Differential
P-P
Differential Composite, f1 = 0.95MHz,
P-P
f2 = 1.05MHz
2V
Differential Composite, f1 = 0.95MHz,
P-P
f2 = 1.05MHz, R
Differential
P-P
2V
Differential, RL = 200Ω Differential
P-P
Differential Composite, RL = 1k,
P-P
= 200Ω Differential
L
f1 = 9.5MHz, f2 = 10.5MHz
2V
Differential Composite, f1 = 9.5MHz,
P-P
f2 = 10.5MHz, R
= 200Ω Differential
L
–88
–87
dBc
dBc
–93 dBc
–91 dBc
–85
–76
dBc
dBc
–92 dBc
–89 dBc
6411f
3
LT6411
ELECTRICAL CHARACTERISTICS
The
temperature range, otherwise specifi cations are at T
= 25°C. VCC = 5V, VEE = 0V, AV = 2, No R
A
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
30MHz Signal
HD Second/Third Harmonic Distortion 2V
IMD3
OIP3
NF Noise Figure Single Ended 24.6 dB
e
n30M
P1dB 1dB Compression Point (Note 10) 19.5 dBm
70MHz Signal
HD Second/Third Harmonic Distortion 2V
IMD3
OIP3
NF Noise Figure Single Ended 24.7 dB
e
n70M
P1dB 1dB Compression Point (Note 10) 19.5 dBm
Third-Order IMD 2V
30M
Output Third-Order Intercept Differential, f1 = 29.5MHz, f2 = 30.5MHz (Note 10) 46.5 dBm
30M
Input Referred Noise Voltage Density 7.6 nV/√Hz
Third-Order IMD 2V
70M
Output Third-Order Intercept Differential, f1 = 69.5MHz, f2 = 70.5MHz (Note 10) 44.5 dBm
70M
Input Referred Noise Voltage Density 7.7 nV/√Hz
Differential
P-P
2V
Differential, RL = 200Ω Differential
P-P
Differential Composite, f1 = 29.5MHz,
P-P
Differential, f2 = 30.5MHz
Differential Composite, f1 = 29.5MHz,
2V
P-P
f2 = 30.5MHz, R
Differential
P-P
2V
Differential, RL = 200Ω Differential
P-P
Differential Composite, f1 = 69.5MHz,
P-P
Differential, f2 = 70.5MHz
2V
Differential Composite, f1 = 69.5MHz,
P-P
f2 = 70.5MHz, R
●
denotes the specifi cations which apply over the full operating
= 200Ω Differential
L
= 200Ω Differential
L
, VEN = 0.4V, V
LOAD
= 0V,
DGND
–77
–64
–87 dBc
–75 dBc
–63
–52
–83 dBc
–64 dBc
dBc
dBc
dBc
dBc
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This parameter is guaranteed to meet specifi ed performance
through design and characterization. It is not production tested.
Note 3: As long as output current and junction temperature are kept
below the Absolute Maximum Ratings, no damage to the part will occur.
Depending on the supply voltage, a heat sink may be required.
Note 4: The LT6411C is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 5: The LT6411C is guaranteed to meet specifi ed performance from
0°C to 70°C. The LT6411C is designed, characterized and expected to
meet specifi ed performance from –40°C and 85°C but is not tested or
QA sampled at these temperatures. The LT6411I is guaranteed to meet
specifi ed performance from –40°C to 85°C.
Note 6: The two supply voltage settings for power supply rejection
are shifted from the typical ±V
measurement is taken at V
headroom for the enable circuitry to function with EN, DGND and all inputs
connected to 0V. The second measurement is taken at V
points for ease of testing. The fi rst
S
= 3V, VEE = –1.5V to provide the required 3V
CC
= 8V, VEE = –4V.
CC
Note 7: Full power bandwidth is calculated from the slew rate:
FPBW = SR/(π • V
Note 8: Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R video
measurement set. The resolution of this equipment is better than 0.05%
and 0.05°. Ten identical amplifi er stages were cascaded giving an effective
resolution of better than 0.005% and 0.005°.
Note 9: Slew rate is 100% production tested on channel 1. Slew rate of
channel 2 is guaranteed through design and characterization.
Note 10: Since the LT6411 is a feedback amplifi er with low output
impedance, a resistive load is not required when driving an ADC.
Therefore, typical output power is very small. In order to compare the
LT6411 with typical g
LT6411 output voltage swing driving an ADC is converted to OIP3 and
P1dB as if it were driving a 50Ω load.
)
P-P
amplifi ers that require 50Ω output loading, the
m
6411f
4
TYPICAL PERFORMANCE CHARACTERISTICS
All measurements are per amplifi er with single-ended outputs unless otherwise noted.
LT6411
Supply Current per Amplifi er
vs Temperature
12
10
V
8
6
4
SUPPLY CURRENT (mA)
2
0
–35 5
–55 –15
EN
= 0.4V
V
EN
25
TEMPERATURE (°C)
Output Offset Voltage
vs Temperature
20
VS = ±5V
= 0V
V
IN
15
= 2
A
V
10
5
0
–5
OFFSET VOLTAGE (mV)
–10
–15
–20
–35 5
–55 –15
25
TEMPERATURE (°C)
VS = ±5V
= ∞
R
L
+
–
, V
= 0V
V
IN
IN
= 0V
85
45
45 125
105
65
6411 G01
85
105
65
6411 G04
125
Supply Current per Ampifi er
vs Supply Voltage
12
= –V
V
CC
EE
VEN, V
= 25°C
T
10
A
8
6
4
SUPPLY CURRENT (mA)
2
0
0123456
+
, V
DGND
, V
IN
TOTAL SUPPLY VOLTAGE (V)
Positive Input Bias Current
vs Input Voltage
20
VS = ±5V
= 2
A
V
0
–20
BIAS CURRENT (µA)
+
IN
–40
–60
–2.5
–1.5
TA = 125°C
TA = 25°C
TA = –55°C
–0.5
INPUT VOLTAGE (V)
–
= 0V
IN
7 8 9 10 11 12
0.5
1.5
6411 G02
6411 G05
2.5
Supply Current per Amplifi er
vs EN Pin Voltage
12
10
SUPPLY CURRENT (mA)
TA = –55°C
TA = 25°C
8
TA = 125°C
6
4
2
0
0 0.5 1.0 1.5 2.0
EN PIN VOLTAGE (V)
2.5 3.0 3.5 4.0
EN Pin Current vs EN Pin Voltage
0
VS = ±5V
= 0V
V
DGND
–20
–40
TA = 125°C
–60
TA = –55°C
TA = 25°C
2
1
EN PIN VOLTAGE (V)
34
EN PIN CURRENT (µA)
–100
–120
–140
–80
0
VS = ±5V
V
DGND
+
, V
V
IN
= 0V
IN
–
= 0V
6411 G03
5
6411 G06
Output Voltage vs Input Voltage
5
VS = ±5V
4
= 1k
R
L
A
= 1
V
3
2
1
0
–1
TA = –55°C
–2
OUTPUT VOLTAGE (V)
–3
–4
–5
–3.5 –1.5
–4.5
TA = 125°C
–2.5
–0.5
INPUT VOLTAGE (V)
0.5 4.5
1.5
TA = 25°C
2.5
3.5
6411 G07
Output Voltage Swing vs I
(Output High)
5
4
TA = –55°C
3
2
OUTPUT VOLTAGE (V)
1
0
10
30
0
40
20
SOURCE CURRENT (mA)
TA = 125°C
LOAD
VS = ±5V
= 2
A
V
= 2V
V
IN
TA = 25°C
6411 G08
Output Voltage Swing vs I
LOAD
(Output Low)
0
VS = ±5V
= 2
A
V
= –2V
V
IN
–1
TA = 25°C
–2
–3
TA = –55°C
OUTPUT VOLTAGE (V)
–4
–5
102030
10050 60 70 80 90
040
TA = 125°C
10050 60 70 80 90
SINK CURRENT (mA)
6411 G09
6411f
5
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