LT6558CGN#TR [Linear]
LT6558 - 550MHz, 2200V/µs Gain of 1, Single Supply Triple Video Amplifier with Input Bias Control; Package: SSOP; Pins: 16; Temperature Range: 0°C to 70°C;
| 型号： | LT6558CGN#TR |
| 厂家： | 
Linear |
| 描述： | LT6558 - 550MHz, 2200V/µs Gain of 1, Single Supply Triple Video Amplifier with Input Bias Control; Package: SSOP; Pins: 16; Temperature Range: 0°C to 70°C 放大器 功率放大器 |
| 文件： | 总12页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT6558
550MHz, 2200V/µs Gain of 1,
Single Supply Triple Video
Amplifier with Input Bias Control
FEATURES
DESCRIPTION
The LT®6558 is a high speed triple video amplifier with an
internal fixed gain of 1 and a programmable DC input bias
■
–3dB Small-Signal Bandwidth: 550MHz
■
–3dB 2V Large-Signal Bandwidth: 400MHz
P-P
■
Slew Rate: 2200V/µs
voltage. This amplifier features a 400MHz 2V signal
P-P
■
Fixed Gain of 1, No External Resistors Required
bandwidth,2200V/µsslewrateandauniqueabilitytodrive
heavy output loads to 0.8V of the supply rails, making the
LT6558idealforasingle5Vsupply,widebandvideoapplica-
tion.Withjustoneresistor,theinputsofallthreeamplifiers
canbeprogrammedtoacommonvoltagelevel,simplifying
and reducing the need for external circuitry in AC-coupled
applications. Without the programming resistor, the input
biascircuitbecomesinactive,allowingtheuseofanexternal
clamp circuit or direct coupled input.
■
AC Coupling with Programmable DC Input Bias
■
Output Swings to 0.8V of Supply Rails
■
Full Video Swing with 5V Single Supply
■
Differential Gain: 0.02%
■
Differential Phase: 0.02°
■
Enable/Shutdown Pin
■
High Output Current: ±±0mA
■
Supply Range: 3V to 7.5V
■
Operating Temperature Range: –40°C to 85°C
TheLT6558hasseparatepowersupplyandgroundpinsfor
each amplifier to improve channel separation and to ease
power supply bypassing. The LT6558 provides uncom-
promised performance in many high speed applications
where a low voltage, single supply is required.
■
Available in 16-Lead SSOP and 5mm × 3mm DFN
Packages
APPLICATIONS
■
LCD Video Projectors
The LT6558 is available in 16-lead SSOP and 5mm × 3mm
DFN packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
RGB HD Video Amplifiers
■
Coaxial Cable Drivers
Low Supply ADC Drivers
■
TYPICAL APPLICATION
AC-Coupled Triple Video Driver
BCV
EN
Fast Large-Signal Transient Response
LT6558
+
158Ω
5V
220µF
V
GND
5
22µF
22µF
22µF
V
V
= 5V
= 2V
S
IN
IN R
P-P
IN R
IN G
IN B
+
–
OUT R
R
L
= 150Ω
4
3
R *
L
+
5V
GND R
IN G
V
R
220µF
+
–
2
1
0
OUT G
+
R *
L
GND G
IN B
5V
V
G
220µF
–10 –8 –6 –4 –2
0
2
4
6
8
10
+
–
OUT B
+
TIME (ns)
6558 TA01b
R *
L
5V
GND B
V
B
6558 TA01a
*50Ω OR GREATER FOR R
L
6558f
1
LT6558
ABSOLUTE MAXIMUM RATINGS (Note 1)
+
Total Supply Voltage (V to GND)...........................7.5V
Junction Temperature
S
Input Current........................................................±10mA
Output Current (Note 2).......................................±±0mA
Output Short-Circuit Duration (Note 2) ............ Indefinite
Operating Temperature Range (Note 3) ... –40°C to 85°C
Specified Temperature Range (Note 4) .... –40°C to 85°C
SSOP ................................................................ 150°C
DFN................................................................... 125°C
Storage Temperature Range
SSOP ................................................. –65°C to 150°C
DFN.................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................ 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
EN
GND
1
2
3
4
5
6
7
8
16 BCV
+
17
EN
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
BCV
15
V
+
G=+1
V
G=+1
G=+1
IN R
14 OUT R
+
IN R
OUT R
+
GND R
IN G
13 V R
G=+1
G=+1
GND R
IN G
V R
12 OUT G
+
OUT G
+
GND G
IN B
11 V G
GND G
IN B
V G
G=+1
10 OUT B
+
OUT B
+
GND B
9
V B
GND B
V
B
DHC PACKAGE
GN PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
16-LEAD PLASTIC SSOP
T
= 125°C, θ = 40°C/W
JA
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
JMAX
T
= 150°C, θ = 110°C/W
JA
JMAX
ORDER PART NUMBER
GN PART MARKING
ORDER PART NUMBER
LT6558CDHC
LT6558IDHC
DHC PART MARKING*
6558
6558
LT6558CGN
LT6558IGN
6558
6558I
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 specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The
otherwise noted.
●
denotes the specifications which apply over the full operating
= open, unless
temperature range, otherwise specifications are at T = 25°C. V = 5V, R = 150Ω to V /2, V = 0.4V, R
A
S
L
S
EN
BCV
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
V
V
V
= 2.5V
12
15
45
55
mV
mV
OS
IN
IN
IN
●
●
●
I
IN
Input Current
= 2.5V
35
45
70
100
µA
µA
R
Input Resistance
Input Capacitance
= 2V to 3V, BCV (Pin 16) Open
200
150
450
400
kΩ
kΩ
IN
C
f = 1MHz
1.4
pF
IN
6558f
2
LT6558
ELECTRICAL CHARACTERISTICS The
otherwise noted.
●
denotes the specifications which apply over the full operating
= open, unless
temperature range, otherwise specifications are at T = 25°C. V = 5V, R = 150Ω to V /2, V = 0.4V, R
A
S
L
S
EN
BCV
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
A ERR
Gain Error
V
= 1.5V to 3.5V
±0.7
±0.±
±2.0
±2.5
%
%
V
IN
●
●
●
●
●
●
●
●
●
●
A MATCH
V
Gain Match Between Channels
Input Voltage Bias
V
IN
= 1.5V to 3.5V
±0.02
±0.05
±1.5
±2.5
%
%
V
IN(DC)
R
= 158Ω
2.0
1.5
2.5
2.8
3
3.5
V
V
BCV
PSRR
Power Supply Rejection Ratio
Output Voltage Swing Low
Output Voltage Swing High
Supply Current per Amplifier
Total Supply Current (Disabled)
Enable Pin Current
V = 4V to 6V, V = 1.25V
S
42
38
50
47
dB
dB
IN
V
V
0.8
0.±
0.±
1.0
V
V
OL
4.1
4.0
4.2
4.1
V
V
OH
+
I
V
EN
= 0.4V, R = ∞, Includes I of V
22.5
25.0
24
28
mA
mA
S
L
S
(Pin 15)
V
= Open, R = ∞
10
10
450
1000
µA
µA
EN
EN
L
I
I
V
= 0.4V
–250
–300
–125
–150
µA
µA
EN
Short-Circuit Current
±60
±40
±±0
±80
mA
mA
SC
SR
Slew Rate
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
= 1.25V to 3.75V (Note 5)
1200
2200
400
550
100
350
V/µs
MHz
MHz
MHz
MHz
–3dB BW
–3dB Bandwidth
= 2V
P-P
= 0.2V
P-P
0.1dB BW
FPBW
Gain Flatness ±0.1dB Bandwidth
Full Power Bandwidth
= 2V
P-P
= 2V (Note 6)
1±0
P-P
XTalk
All Hostile Crosstalk
f = 10MHz, V
= 2V
OUT
–80
–55
dB
dB
OUT
P-P
f = 100MHz, V
= 2V
P-P
t
S
Settling Time
To 1%, V
= 1.5V to 3.5V
OUT
4
7
ns
ns
To 0.1%
t , t
Rise Time, Fall Time
Differential Gain
10% to ±0%, V
NTSC Signal
NTSC Signal
= 1.5V to 3.5V
875
0.02
0.02
–75
–7±
ps
%
r
f
OUT
ΔG
ΔΦ
Differential Phase
Deg
dBc
dBc
HD2
HD3
2nd Harmonic Distortion
3rd Harmonic Distortion
f = 10MHz, V = 2V
OUT
P-P
P-P
f = 10MHz, V
= 2V
OUT
meet specified performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures.The LT6558I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 5: Slew rate is 100% production tested on the R channel and
measured on the rising edge of the output signal. The slew rate of the
falling edge and of the G and B channels is guaranteed through design and
characterization.
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: A heat sink may be required to keep the junction temperature
below the Absolute Maximum Rating.
Note 3: The LT6558C is guaranteed functional over the temperature range
of –40°C and 85°C.
Note 6: Large-signal bandwidth is calculated from slew rate:
FPBW = SR/(π • V
)
P-P
Note 4: The LT6558C is guaranteed to meet specified performance from
0°C to 70°C. The LT6558C is designed, characterized and expected to
6558f
3
LT6558
TYPICAL PERFORMANCE CHARACTERISTICS
Gain Error Distribution
Gain Error Matching Distribution
Voltage Gain vs Temperature
1.03
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
V
= 5V
OUT
= 150Ω
V
V
= 5V
S
V
= 5V
OUT
= 150Ω
S
S
∆V
= 2V
= 2V
∆V
= 2V
OUT
P-P
1.02
1.01
R
L
R
= 150Ω
R
L
LOAD
1.00
0.99
0.98
0.97
0.96
0.95
–50 –25
0
25
50
75 100 125
–0.5
–1.0
–0.9
–0.8
–0.7
–0.6
–0.3 –0.2 –0.1
0
0.1
0.2
0.3
TEMPERATURE (°C)
GAIN ERROR, INDIVIDUAL CHANNEL (%)
GAIN ERROR, BETWEEN CHANNELS (%)
6558 G03
6558 G01
6558 G02
Supply Current per Amplifier
vs Supply Voltage
Supply Current per Amplifier
vs Temperature
Supply Current per Amplifier
vs EN Voltage
40
30
20
10
0
40
35
30
25
20
15
10
5
40
35
30
25
20
15
10
5
V
V
= 5V
OUT
V
= V /2
S
S
V
V
V
= 5V
OUT
S
= V /2
S
= V /2
OUT
S
= 0V
EN
T
= 125°C
= 25°C
A
T
A
T
= –55°C
A
0
0
0
1
2
3
4
5
0
1
2
3
4
5
6
7
–50 –25
0
25
50
75 100 125
ENABLE PIN VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
6558 G06
6558 G04
6558 G05
Input Bias Current
vs Input Voltage
EN Pin Current vs EN Pin Voltage
Offset Voltage vs Temperature
400
300
0
–20
40
35
30
25
20
15
10
5
V = 5V
S
V
= 5V
V
V
= 5V
IN
S
S
= 2.5V
200
T
= 25°C
–40
A
T
= 125°C
A
T
= 25°C
T = 125°C
A
100
A
–60
0
–80
T
= –55°C
A
–100
–200
–300
–400
–100
–120
–140
–160
T = –55°C
A
0
0
1
2
3
4
5
0
1
2
3
4
5
–50 –25
0
25
50
75 100 125
INPUT VOLTAGE (V)
ENABLE PIN VOLTAGE (V)
TEMPERATURE (°C)
6558 G09
6558 G07
6558 G08
6558f
4
LT6558
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing
vs Load Current (Output High)
Output Voltage Swing
vs Load Current (Output Low)
Output Voltage vs Input Voltage
5
4
3
2
1
0
2.5
2.0
1.5
5.0
4.5
4.0
V
= 5V
LOAD
V
V
= 5V
= 0V
V
V
= 5V
IN
S
S
IN
S
T
= 125°C
A
R
= 150Ω TO V /2
= 4.5V
S
T
= 125°C
A
T
A
= 25°C
A
T
= –55°C
A
T
= –55°C
T
= 25°C
A
T
= 25°C
T
= –55°C
A
A
1.0
0.5
0
3.5
3.0
2.5
T
= 125°C
A
0
1
2
3
4
5
0
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
6558 G10
6558 G12
6558 G11
Input Bias Voltage vs Resistance
at BCV Pin
Bias Control Voltage
vs Temperature
Input Bias Voltage vs Temperature
3.5
3.0
2.5
2.0
1.5
1.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
80
70
60
50
V
= 5V
V = 5V
S
V
= 5V
BCV
S
S
R
BCV
= 158Ω
R
= 158Ω
40
30
20
120 140 160 180 200 220 240 260
–50 –25
0
25
50
75
100 125
–50 –25
0
25
50
75
100 125
BVC-RESISTANCE (Ω)
TEMPERATURE (°C)
TEMPERATURE (°C)
6558 G13
6558 G14
6558 G15
Frequency Response of Three
Amplifiers
Frequency Response
Gain Flatness vs Frequency
0.5
0.4
0.3
0.2
5
4
5
4
V
V
= 5V
OUT
= 150Ω
V
= 5V
S
OUT
= 150Ω
L
V
= 5V
= 150Ω
S
L
S
= 2V
V
= 2V
P-P
R
P-P
R
R
L
3
3
V
= 200mV
OUT
P-P
2
2
1
1
0.1
0
0
0
V
= 2V
–1
–2
–3
–4
–5
–1
–2
–3
–4
–5
–0.1
–0.2
–0.3
–0.4
–0.5
OUT
P-P
IN-R
IN-G
IN-B
IN-R
IN-G
IN-B
1
10
100
1000
1
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
6558 G16
6558 G17
6558 G18
6558f
5
LT6558
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Response with
Capacitive Loads
Crosstalk Between Amplifiers
vs Frequency
Large-Signal Group Delay
5
4
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
–30
–40
V
V
= 5V
OUT
= 150Ω
V
V
= 5V
S
OUT
R = 150Ω
L
V
V
= 5V
OUT
= 150Ω
S
S
= 200mV
= 2V
P-P
= 2V
P-P
P-P
C
= 8.2pF
L
R
R
L
L
3
–50
C
= 4.7pF
L
2
WORST CASE
CHANNEL TO CHANNEL
–60
1
0
–70
C
= 0pF
L
–1
–2
–3
–4
–5
–80
R
= 158Ω
BCV
TYPICAL
CHANNEL TO CHANNEL
–90
–100
–110
R TO G
B TO G
1
10
100
1000
1
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
6558 G19
6558 G21
6558 G20
Power Supply Rejection Ratio vs
Frequency
Input Impedance vs Frequency
Output Impedance vs Frequency
60
1000000
100000
10000
1000
100
1000000
100000
10000
1000
V
S
= 5V
V
= 5V
V = 5V
S
S
R
= OPEN
BCV
50
40
DISABLE
30
20
R
= 158Ω
BCV
10
10
0
1
ENABLE
1
0.1
0.01
100
0.01
0.1
10
100
1000
0.001
0.01
0.1
1
10
100
0.1
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
6558 G24
6558 G22
6558 G23
Distortion vs Frequency
Distortion vs Frequency
0
10
20
30
40
50
60
70
80
90
0
10
V
V
= 5V
OUT
= 150Ω
V
V
= 5V
OUT
R = 150Ω
L
S
S
= 1V
= 2V
P-P
P-P
R
20
L
30
40
50
60
70
HD2
HD3
80
HD2
HD3
90
100
110
120
100
110
120
0.01
0.1
1
10
100
0.01
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
6558 G25
6558 G26
6558f
6
LT6558
TYPICAL PERFORMANCE CHARACTERISTICS
Enable/Disable Response
Input Noise Spectral Density
6
5
1000
100
10
1000
100
10
V
V
= 5V
IN
V
S
EN(DISABLE)
= 2.5V
V
V
= 5V
S
OUT
4
3
2
1
= 2V
+i
P-P
n
R
= 150Ω
L
e
V
OUT
n
0
V
EN(ENABLE)
–1
1
0
0.01
0.1
1
10
100
0
0.4
0.8
1.2
1.6
2.0
2.4 2.6
FREQUENCY (kHz)
TIME (µs)
6558 G27
6558 G28
Large-Signal Transient Response
Small-Signal Transient Response
5
4
3
2.65
2.60
2.55
2.50
2.45
V
V
= 5V
= 2V
V
V
= 5V
S
IN
S
= 100mV
P-P
IN
= 150Ω
P-P
R
= 150Ω
R
L
L
2
1
0
0
2
4
6
8
10 12 14 16 18 20
0
2
4
6
8
10 12 14 16 18 20
TIME (ns)
TIME (ns)
6558 G30
6558 G29
PIN FUNCTIONS
EN (Pin 1): Enable Control Pin. The part is enabled when
this pin is pulled low. An internal pull-up resistor of 40k
will turn the part off if this pin is unconnected.
IN G (Pin 5): Green Channel Input. This pin has a nomi-
nal impedance of 450kΩ with input bias circuit inactive,
Pin 16 open.
GND (Pin 2): Ground Reference for Enable Pin (Pin 1)
and Bias Control Voltage Pin (Pin 16). This pin must be
connected externally to ground.
GND G (Pin 6): Ground of Green Channel Amplifier. This
pin is not internally connected to other ground pins and
must be connected externally to ground.
IN R (Pin 3): Red Channel Input. This pin has a nominal
impedance of 450kΩ with input bias circuit inactive,
Pin 16 open.
IN B (Pin 7): Blue Channel Input. This pin has a nominal
impedance of 450kΩ with input bias circuit inactive,
Pin 16 open.
GND R (Pin 4): Ground of Red Channel Amplifier. This pin
is not internally connected to other ground pins and must
be connected externally to ground.
GND B (Pin 8): Ground of Blue Channel Amplifier. This
pin is not internally connected to other ground pins and
must be connected externally to ground.
6558f
7
LT6558
PIN FUNCTIONS
+
V B (Pin 9): Positive Supply Voltage of Blue Channel
the supply voltage bus with proper bypassing. For best
performance, see Power Supply Considerations.
Amplifier. This pin is not internally connected to other
supply voltage pins and must be externally connected to
the supply voltage bus with proper bypassing. For best
performance, see Power Supply Considerations.
OUT R (Pin 14): Red Channel Output.
+
V (Pin 15): Positive Supply Voltage of Control Circuitry.
Thispinisnotinternallyconnectedtoothersupplyvoltage
pins and must be externally connected to supply voltage
bus with proper bypassing. For best performance, see
Power Supply Considerations.
OUT B (Pin 10): Blue Channel Output.
+
V G (Pin 11): Positive Supply Voltage of Green Channel
Amplifier. This pin is not internally connected to other
supply voltage pins and must be externally connected to
the supply voltage bus with proper bypassing. For best
performance, see Power Supply Considerations.
BCV (Pin 16): Bias Control Voltage. A resistor connected
between Pin 16 and Pin 2 (GND) will generate a DC voltage
bias at the inputs of the three amplifiers for AC coupling
application, see Programmable Input Bias.
OUT G (Pin 12): Green Channel Output.
+
V R (Pin 13): Positive Supply Voltage of Red Channel
Exposed Pad (Pin 17, DFN Package): Ground. This pad
must be soldered to PCB and is internally connected to
GND (Pin 2).
Amplifier. This pin is not internally connected to other
supply voltage pins and must be externally connected to
APPLICATIONS INFORMATION
Power Supply Considerations
The grounds are separately pinned for each amplifier to
minimize crosstalk.
The LT6558 is optimized to provide full video signal swing
output when operated from a standard 5V single supply.
Due to the supply current involved in ultrahigh slew rate
amplifiersliketheLT6558,selectionofthelowestworkable
supply voltage is recommended to minimize heat genera-
tion and simplify thermal management. Temperature rise
Operation from split supplies can be accomplished by
connecting the LT6558 ground pins to the negative rail.
With dual supplies, recommended voltages range from
nominal ±2.5V to ±3.3V.
The ultrahigh frequency (UHF) operating range of the
LT6558 requires that careful printed circuit layout prac-
tices be followed to obtain maximum performance. Trace
lengthsbetweenpowerpinsandbypasscapacitorsshould
be minimized (<0.1 inch) and one or more dedicated
ground planes should be employed to minimize parasitic
inductance. Poor layout or breadboarding methods can
seriously impact amplifier stability, frequency response
and crosstalk performance. A 2.2µF and a 10µF bypass
capacitor is recommended for the LT6558 supply bus,
plus a 10nF high frequency bypass capacitor at each
individual power pin.
at the internal devices (T ) must be kept below 150°C
J
(SSOP package) or 125°C (DFN package), and can be
estimated from the ambient temperature (T ) and power
A
dissipation (P ) as follows:
D
T = T + P • 40°C/W for DFN package
J
A
D
or
T = T + P • 110°C/W for SSOP package
J
A
D
where P = (I + 0.5 • I ) • V
S(TOTAL)
D
S
O
Thelatterequationassumes(conservatively)thattheoutput
swing is small relative to the supply and RMS load current
(I ) is bidirectional (as with AC coupling).
O
6558f
8
LT6558
APPLICATIONS INFORMATION
Programmable Input Bias
no-signal amplifier input bias condition according to the
following relationship:
The LT6558 contains circuitry that provides a user-pro-
grammed bias voltage to the inputs of all three amplifier
sections. The internal biasing feature is designed to mini-
mize external component count in AC-coupled applica-
tions, but may be defeated if external biasing is desired.
Figure 1 shows the simplified equivalent circuit feeding
the noninverting input of each amplifier. A programming
resistorfromPin16toGND(Pin2)establishesthenominal
V
PIN16 •9.1k
RSET
VBIAS(IN)
=
where V
= 0.044V typical.
PIN16
For single 5V supply operation, a 158Ω programming
resistor is generally optimal. In applications that demand
maximum amplifier linearity, or if external biasing is
preferred (in DC-coupled applications, for example), the
internal biasing circuitry may be disabled by leaving Pin
16 open. With BCV (Pin 16) open, input loading is ap-
proximately 450kΩ.
+
V
V
R
PIN16
I =
SET
2.5k
Shutdown Control
IN
9.1k
The LT6558 may be placed into a shutdown mode, where
allthreeamplifiersectionsaredeactivatedandpowersup-
ply draw is reduced to approximately 10µA. When the EN
pin is left open, an internal 40k pull-up resistor brings the
6558 F01
Figure 1. Simplified Programmable Input Bias Circuit Diagram
+
pin to V and the part enters the shutdown mode. Pulling
+
the pin more than approximately 1.5V below V will en-
+
V
able the LT6558 (see Figure 2 for equivalent circuit). The
pull-down current required to activate the part is typically
125µA. In most applications, the EN pin is simply con-
nected to ground (for continuous operation) or driven
directly by a CMOS-level logic gate (see Figure 3 for
examples). Response time is typically 50ns for enabling,
and 1µs for shutdown. In shutdown mode, the feedback
resistors remain connected between the output pins and
40k
BIAS
CIRCUITRY
6558 F02
EN
–
the individual ground (or V connected) pins.
Figure 2. Simplified Shutdown Circuit Diagram
+
V
+
V
1
1
EN
LT6558
LT6558
2
DISABLE
EN
DISABLE
2
6558 F03
(3a) Open Drain or Open Collector
(3b) CMOS Gate with Shared Supply
Figure 3. Suitable Shutdown Pin Drive Circuits
6558f
9
LT6558
SIMPLIFIED SCHEMATIC (Single Amplifier Section)
+
V
EN
BIAS
IN
OUT
+
+
+
V
V
V
6558 SS
PACKAGE DESCRIPTION
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.189 – .196*
(4.801 – 4.978)
.045 .005
.009
(0.229)
REF
16 15 14 13 12 11 10 9
.254 MIN
.150 – .165
.229 – .244
.150 – .157**
(5.817 – 6.198)
(3.810 – 3.988)
.0165 .0015
.0250 BSC
RECOMMENDED SOLDER PAD LAYOUT
1
2
3
4
5
6
7
8
.015 .004
(0.38 0.10)
× 45°
.0532 – .0688
(1.35 – 1.75)
.004 – .0098
(0.102 – 0.249)
.007 – .0098
(0.178 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
.0250
(0.635)
BSC
.008 – .012
GN16 (SSOP) 0204
(0.203 – 0.305)
TYP
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
3. DRAWING NOT TO SCALE
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
6558f
10
LT6558
PACKAGE DESCRIPTION
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706)
0.65 0.05
3.50 0.05
1.65 0.05
2.20 0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 0.05
0.50 BSC
4.40 0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
0.40 0.10
5.00 0.10
(2 SIDES)
9
16
R = 0.20
TYP
3.00 0.10 1.65 0.10
(2 SIDES)
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PIN 1
NOTCH
(DHC16) DFN 1103
8
1
0.25 0.05
0.50 BSC
0.75 0.05
0.200 REF
4.40 0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
6558f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT6558
TYPICAL APPLICATION
DC-Coupled Split Supply Operation
1
2
16
BCV
EN
LT6558
15
+
2.5V
V
GND
3
4
75Ω
IN Pr
IN Pb
IN Y
+
–
14
13
OUT_Pr
75Ω
+
V
5
6
75Ω
75Ω
+
–
12
11
OUT_Pb
75Ω
+
V
7
+
–
10
9
OUT_Y
75Ω
8
+
V
6558 TA02
–2.5V
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT13±±
300MHz Triple Current Feedback Amplifier
250MHz Triple RGB Multiplexer
0.1dB Gain Flatness to 150MHz, Shutdown
100MHz Pixel Switching, 1100V/µs Slew Rate, 16-Lead SSOP
110MHz Gain of 2 Buffers in MS Package
Optimized for Driving 75Ω Cables
LT1675
LT6550/LT6551
LT6553
3.3V Triple and Quad Video Buffers
650MHz Gain of 2 Triple Video Amplifier
650MHz Gain of 1 Triple Video Amplifier
650MHz Gain of 2 Triple Video Multiplexer
750MHz Gain of 1 Triple Video Multiplexer
500MHz, Gain of 2 Triple Video Amplifier
Low Cost, 300MHz, Triple Video Amplifier
LT6554
Performance Similar to the LT6553 with A = 1, 16-Lead SSOP
V
LT6555
Optimized for Driving 75Ω Cables
LT6556
High Slew Rate 2100V/µs
LT6557
Optimized for Single 5V Supply Driving 75Ω Cables, High Slew Rate 2200V/µs
3mm × 3mm QFN Package
LT655±
6558f
LT 0906 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
© LINEAR TECHNOLOGY CORPORATION 2006
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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