LT1259CS#PBF [Linear]
LT1259 - Low Cost Dual and Triple 130MHz Current Feedback Amplifiers with Shutdown; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C;
| 型号： | LT1259CS#PBF |
| 厂家： | 
Linear |
| 描述： | LT1259 - Low Cost Dual and Triple 130MHz Current Feedback Amplifiers with Shutdown; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
| 文件： | 总12页 (文件大小：326K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1259/LT1260
Low Cost Dual and Triple
130MHz Current Feedback
Amplifiers with Shutdown
U
FEATURES
DESCRIPTIO
The LT®1259 contains two independent 130MHz current
feedback amplifiers, each with a shutdown pin. These
amplifiersaredesignedforexcellentlinearitywhiledriving
cables and other low impedance loads. The LT1260 is a
triple version especially suited to RGB video applications.
These amplifiers operate on all supplies from single 5V to
±15V and draw only 5mA per amplifier when active.
■
90MHz Bandwidth on ±5V
■
0.1dB Gain Flatness >30MHz
■
Completely Off in Shutdown, 0µA Supply Current
■
High Slew Rate: 1600V/µs
■
Wide Supply Range: ±2V(4V) to ±15V(30V)
■
60mA Output Current
■
Low Supply Current: 5mA/Amplifier
■
Differential Gain: 0.016%
When shut down, the LT1259/LT1260 amplifiers draw
zero supply current and their outputs become high
impedance. Only two LT1260s are required to make a
complete 2-input RGB MUX and cable driver. These
amplifiers turn on in only 100ns and turn off in 40ns,
making them ideal in spread spectrum and portable
equipment applications.
■
Differential Phase: 0.075°
■
Fast Turn-On Time: 100ns
■
Fast Turn-Off Time: 40ns
■
14-Pin and 16-Pin Narrow SO Packages
U
APPLICATIO S
■
The LT1259/LT1260 amplifiers are manufactured on
Linear Technology’s proprietary complementary bipolar
process.
RGB Cable Drivers
■
Spread Spectrum Amplifiers
■
MUX Amplifiers
■
Composite Video Cable Drivers
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Portable Equipment
U
TYPICAL APPLICATIO
2-Input Video MUX Cable Driver
Square Wave Response
CHANNEL
SELECT
A
B
EN A
V
IN A
+
75Ω
R
G
1/2 LT1259
1.6k
–
75Ω
CABLE
R
F
1.6k
V
OUT
EN B
75Ω
V
IN B
+
75Ω
R
G
1/2 LT1259
1.6k
LT1259/60 • TA01
–
R
1.6k
F
LT1259/50 • TA02
RL = 150Ω
f = 30MHz
1
LT1259/LT1260
W W U W
ABSOLUTE AXI U RATI GS
Operating Temperature Range ............... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Junction Temperature (Note 4)............................ 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Supply Voltage ..................................................... ±18V
Input Current ..................................................... ±15mA
Output Short-Circuit Duration (Note 1).........Continuous
Specified Temperature Range (Note 2)....... 0°C to 70°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ORDER PART
TOP VIEW
A
NUMBER
1
2
3
4
5
6
7
8
EN R
16
15
14
13
12
11
10
9
–IN R
+IN R
GND
R
G
B
1
2
3
4
5
6
7
EN A
14
13
12
11
10
9
–IN A
+IN A
GND
OUT R
OUT A
+
V
LT1259CN
LT1259CS
LT1259IN
LT1259IS
LT1260CN
LT1260CS
LT1260IN
LT1260IS
+
V
EN G
–IN G
+IN G
GND
GND
GND
OUT G
–
V
GND
–
V
OUT B
EN B
+IN B
–IN B
B
OUT B
EN B
+IN B
–IN B
8
N PACKAGE
14-LEAD PLASTIC DIP
S PACKAGE
N PACKAGE
S PACKAGE
14-LEAD PLASTIC SOIC
16-LEAD PLASTIC DIP 16-LEAD PLASTIC SOIC
TJMAX = 150°C, θJA = 70°C/W (N)
JMAX = 150°C, θJA = 110°C/W (S)
TJMAX = 150°C, θJA = 70°C/W (N)
TJMAX = 150°C, θJA = 100°C/W (S)
T
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
0°C ≤ TA ≤ 70°C, each amplifier VCM = 0V, ±5V ≤ VS ≤ ±15V, EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
T = 25°C
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
2
12
16
mV
mV
OS
+
A
●
●
Input Offset Voltage Drift
Noninverting Input Current
30
µV/°C
I
I
T = 25°C
A
0.5
3
6
µA
µA
IN
●
●
–
Inverting Input Current
T = 25°C
A
20
90
120
µA
µA
IN
e
Input Noise Voltage Density
f = 1kHz, R = 1k, R = 10Ω, R = 0Ω
3.6
1.3
45
nV/√Hz
pA/√Hz
pA/√Hz
n
F
G
S
+i
–i
Noninverting Input Noise Current Density
Inverting Input Noise Current Density
Input Resistance
f = 1kHz
f = 1kHz
n
n
R
V
V
= ±13V, V = ±15V
●
●
2
2
17
25
MΩ
MΩ
IN
IN
IN
S
= ±3V, V = ±5V
S
C
Input Capacitance
Enabled
Disabled
2
4
pF
pF
IN
C
V
Output Capacitance
Input Voltage Range
Disabled
4.4
pF
OUT
IN
V = ±15V, T = 25°C
S
±13
±12
±3
±13.5
V
V
V
V
A
●
●
V = ±5V, T = 25°C
S
±3.5
A
±2
2
LT1259/LT1260
ELECTRICAL CHARACTERISTICS
0°C ≤ TA ≤ 70°C, each amplifier VCM = 0V, ±5V ≤ VS ≤ ±15V, EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
V = ±15V, R = 1k
MIN
TYP
MAX
UNITS
V
Maximum Output Voltage Swing
●
●
±12.0
±3.0
±2.5
±14.0
±3.7
V
V
V
OUT
S
L
V = ±5V, R = 150Ω, T = 25°C
S
L
A
CMRR
Common-Mode Rejection Ratio
V = ±15V, V = ±13V, T = 25°C
55
55
52
52
69
63
dB
dB
dB
dB
S
CM
A
V = ±15V, V = ±12V
●
●
S
CM
V = ±5V, V = ±3V, T = 25°C
S
S
CM
CM
A
V = ±5V, V = ±2V
Inverting Input Current
V = ±15V, V = ±13V, T = 25°C
3.5
4.5
10
10
15
15
µA/V
µA/V
µA/V
µA/V
S
CM
A
Common-Mode Rejection
V = ±15V, V = ±12V
●
●
S
CM
V = ±5V, V = ±3V, T = 25°C
S
S
CM
CM
A
V = ±5V, V = ±2V
–
–
PSRR
Power Supply Rejection Ratio
V = ±2V to ±15V, EN Pins at V , T = 25°C
S
60
60
80
15
dB
dB
S
A
V = ±3V to ±15V, EN Pins at V
●
●
●
–
–
Noninverting Input Current
Power Supply Rejection
V = ±3V to ±15V, EN Pins at V , T = 25°C
65
75
nA/V
nA/V
S
A
V = ±3V to ±15V, EN Pins at V
S
–
–
Inverting Input Current
Power Supply Rejection
V = ±2V to ±15V, EN Pins at V , T = 25°C
0.1
5
5
µA/V
µA/V
S
A
V = ±3V to ±15V, EN Pins at V
S
A
Large-Signal Voltage Gain
V = ±15V, V
= ±10V, R = 1k
●
●
57
57
72
69
dB
dB
V
S
OUT
L
V = ±5V, V
= ±2V, R = 150Ω
L
S
OUT
–
R
Transresistance, ∆V /∆I
V = ±15V, V
= ±10V, R = 1k
●
●
120
100
300
200
kΩ
kΩ
OL
OUT IN
S
OUT
L
V = ±5V, V
= ±2V, R = 150Ω
S
OUT
L
I
I
Maximum Output Current
R = 0Ω, T = 25°C
30
60
mA
OUT
S
L
A
Supply Current per Amplifier
(Note 5)
V = ±15V, V
= 0V, T = 25°C
5.0
7.5
7.9
6.7
mA
mA
mA
S
OUT
A
●
V = ±5V, V
= 0V, T = 25°C
4.5
S
OUT
A
Disable Supply Current per Amplifier
Enable Pin Current
V = ±15V, EN Pin Voltage = 14.5V, R = 150Ω
S
●
●
3
1
16.7
2.7
µA
µA
S
L
V = ±15V, Sink 1µA From EN Pin
V = ±15V, EN Pin Voltage = 0V, T = 25°C
60
200
300
µA
µA
S
A
●
SR
Slew Rate (Note 6)
T = 25°C
900
1600
100
40
V/µs
ns
A
t
t
Turn-On Delay Time (Note 7)
Turn-Off Delay Time (Note 7)
Small-Signal Rise and Fall Time
Propagation Delay
A = 10, T = 25°C
V
400
150
ON
A
A = 10, T = 25°C
V
ns
OFF
A
t , t
r
V = ±12V, R = R = 1.5k, R = 150Ω
S
4.2
ns
f
F
G
L
V = ±12V, R = R = 1.5k, R = 150Ω
S
4.7
ns
F
G
L
Small-Signal Overshoot
Settling Time
V = ±12V, R = R = 1.5k, R = 150Ω
5
%
S
F
G
L
t
0.1%, V
= 10V, R = R = 1.5k, R = 1k
75
ns
S
OUT
F
G
L
Differential Gain (Note 8)
Differential Phase (Note 8)
V = ±12V, R = R = 1.5k, R = 150Ω
0.016
0.075
%
S
F
G
L
V = ±12V, R = R = 1.5k, R = 150Ω
DEG
S
F
G
L
–40°C ≤ TA ≤ 85°C, each amplifier VCM = 0V, ±5V ≤ VS ≤ ±15V, EN pins = 0V, pulse tested, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
18
UNITS
mV
µA
V
Input Offset Voltage
Noninverting Input Current
Inverting Input Current
Input Resistance
●
●
●
●
●
●
●
OS
+
I
I
7
IN
–
130
µA
IN
R
IN
V
= ±3V, V = ±5V
1
MΩ
dB
IN
S
A
Large-Signal Gain
55
V
I
Disable Supply Current per Amplifier
Enable Pin Current
V = ±15V, EN Pin Voltage = 14.5V, R = 150Ω
S
19
µA
S
L
V = ±15V, EN Pin Voltage = 0V
S
350
µA
3
LT1259/LT1260
ELECTRICAL CHARACTERISTICS
T
he ● denotes specifications which apply over the specified operating
Note 5: The supply current of the LT1259/LT1260 has a negative
temperature coefficient. See Typical Performance Characteristics.
temperature range.
Note 1: A heat sink may be required depending on the power supply
voltage and how many amplifiers have their outputs short circuited.
Note 6: Slew rate is measured at ±5V on a ±10V output signal while
operating on ±15V supplies with RF = 1k, RG = 110Ω and RL = 1k.
Note 2: Commercial grade parts are designed to operate over the
temperature range of –40°C to 85°C but are neither tested nor guaranteed
beyond 0°C to 70°C. Industrial grade parts specified and tested over
–40°C to 85°C are available on special request. Consult factory.
Note 7: Turn-on delay time is measured while operating on ±5V
supplies with RF = 1k, RG = 110Ω and RL = 150Ω. The tON is measured
from control input to appearance of 0.5V at the output, for VIN = 0.1V.
Likewise, turn-off delay time is measured from control input to
appearance of 0.5V on the output for VIN = 0.1V.
Note 3: Ground pins are not internally connected. For best
performance, connect to ground.
Note 4: TJ is calculated from the ambient temperature TA and the
power dissipation PD according to the following formulas:
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 0.1% and 0.1°.
Six identical amplifier stages were cascaded giving an effective
resolution of 0.016% and 0.016°.
LT1259CN/LT1259IN: TJ = TA + (PD • 70°C/W)
LT1259CS/LT1259IS: TJ = TA + (PD • 110°C/W)
LT1260CNLT1260IN/: TJ = TA + (PD • 70°C/W)
LT1260CS/LT1260IS: TJ = TA + (PD • 100°C/W)
W U
TYPICAL AC PERFOR A CE
SMALL SIGNAL
–3dB BW (MHz)
SMALL SIGNAL
0.1dB BW (MHz)
SMALL SIGNAL
PEAKING (dB)
V (V)
S
A
V
R (Ω)
L
R (Ω)
F
R (Ω)
G
±12
±5
2
150
150
150
150
1.5k
1.1k
1.1k
825
1.5k
1.1k
121
130
93
53
40
20
16
0.1
0
2
±12
±5
10
10
69
0.13
0
90.9
61
U W
TYPICAL PERFOR A CE CHARACTERISTICS
±12V Frequency Response, AV = 10
±12V Frequency Response, AV = 2
12
11
10
9
0
26
25
24
23
22
21
20
19
18
17
16
0
V
=
12V
S
L
F
–20
–20
R
= 150Ω
PHASE
R = 1.1k
R
–40
–40
= 121Ω
G
PHASE
–60
–60
8
–80
–80
7
–100
–120
–140
–160
–180
–200
–100
–120
–140
–160
–180
–200
GAIN
12V
GAIN
6
5
4
V
=
S
L
F
R
= 150Ω
3
R = R = 1.5k
G
2
1
10
FREQUENCY (MHz)
100
1
10
100
FREQUENCY (MHz)
LT1259/60 • TPC01
LT1259/60 • TPC01
4
LT1259/LT1260
U W
TYPICAL PERFOR A CE CHARACTERISTICS
±5V Frequency Response, AV = 2
±5V Frequency Response, AV = 10
12
11
10
9
0
26
25
24
23
22
21
20
19
18
17
16
0
–20
–20
–40
–40
PHASE
PHASE
–60
–60
8
–80
–80
7
–100
–120
–140
–160
–180
–200
–100
–120
–140
–160
–180
–200
GAIN
5V
GAIN
5V
6
5
V
=
S
L
F
G
4
V
=
R
= 150Ω
S
L
F
R
= 150Ω
R = 825Ω
= 90.9Ω
3
R = R = 1.1k
R
G
2
1
10
FREQUENCY (MHz)
100
1
10
100
FREQUENCY (MHz)
LT1259/60 • TPC03
LT1259/60 • TPC04
Total Harmonic Distortion
vs Frequency
2nd and 3rd Harmonic Distortion
vs Frequency
Maximum Undistorted Output
vs Frequency
0.1
–20
–30
25
20
V
R
R
=
12V
V
S
V
O
A
V
=
12V
P-P
V
S
=
= 1k
= 2k
15V
S
L
F
= 400Ω
= 2V
R
R
L
F
= R = 1.5k
= 10dB
= 100Ω
= 1.5k
G
R
R
L
F
V
= 6V
RMS
O
–40
–50
–60
–70
15
10
5
A
V
= 10
0.01
A
V
= 1
A = 2
V
V
= 1V
O
RMS
2ND
3RD
0.001
0
10
100
1k
FREQUENCY (Hz)
10k
100k
1
10
FREQUENCY (MHz)
100
1
10
FREQUENCY (MHz)
100
LT12359/60 • TPC06
LT12359/60 • TPC07
LT1259/60 • TPC05
Power Supply Rejection
vs Frequency
Spot Noise Voltage and Current
vs Frequency
Output Impedance vs Frequency
100
10
1
100
10
1
80
70
60
50
40
30
20
10
0
V
R
R
=
15V
V = 15V
S
S
L
F
= 1OOΩ
–i
n
= R = 1k
G
R
= R = 2k
G
F
NEGATIVE
POSITIVE
e
n
+i
n
0.1
10k
100k
1M
10M
100M
10k
100k
1M
10M
100M
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
LTC1259/60 • TPC08
LT1259/60 • TPC10
LT1259/60 • TPC09
5
LT1259/LT1260
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Output Impedance in Shutdown
vs Frequency
Maximum Capacitive Load
vs Feedback Resistor
Supply Current vs Supply Voltage
100
10
1
1000
100
10
7
6
5
V
A
=
15
S
V
F
= 1
–55°C
R
= 1.5k
V
=
5V
V
=
15V
S
S
25°C
4
3
2
1
0
125°C
A
= 2
V
L
R
= 150Ω
PEAKING ≤ 5dB
0.1
100k
1M
10M
100M
1
2
3
4
5
6
0
2
4
6
8
10
18
12 14 16
FREQUENCY (Hz)
FEEDBACK RESISTOR (kΩ)
SUPPLY VOLTAGE ( V)
LT1259/60 • TPC11
LT1259/60 • TPC12
LT1259/60 • TPC13
Input Common-Mode Limit
vs Temperature
Output Saturation Voltage
vs Temperature
Output Short-Circuit Current
vs Junction Temperature
+
+
V
V
80
70
60
50
40
R
= ∞
L
–0.5
–1.0
–1.5
–2.0
+
V
= 2V TO 18V
2V ≤ V
≤ 18V
–0.5
–1.0
S
2.0
1.5
1.0
0.5
1.0
0.5
–
V
= –2V TO –18V
–
–
V
V
–50
0
25
50
75 100 125
–25
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
50 75
–50 –25
0
25
100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1259/60 • TPC16
LT1259/60 • TPC14
LT1259/60 • TPC15
Settling Time to 10mV
vs Output Step
Small-Signal Rise Time
10
8
V
=
12V
S
F
R
= 1.5k
6
4
2
NONINVERTING
INVERTING
0
–2
–4
–6
–8
–10
500 800
600 700
0
400
100 200 300
SETTLING TIME (ns)
LT1259/60 G19
R
F = RG = 1.6k
VS = ±15V
AV = 2
LT1259/60 • TPC17
RL = 150Ω
6
LT1259/LT1260
W
W
SI PLIFIED SCHE ATIC , each amplifier
+
V
+IN
–IN
OUT
EN
–
V
LT1259/60 • SS
W U U
U
APPLICATIO S I FOR ATIO
more stable at higher gains. Alternatively, a small resistor
(10Ωto20Ω)canbeputinserieswiththeoutputtoisolate
the capacitive load from the amplifier output. This has the
advantage that the amplifier bandwidth is only reduced
when the capacitive load is present. The disadvantage is
that the gain is a function of the load resistance.
Feedback Resistor Selection
Thesmall-signalbandwidthoftheLT1259/LT1260areset
bytheexternalfeedbackresistorsandtheinternaljunction
capacitors. As a result, the bandwidth is a function of the
supply voltage, the value of the feedback resistor, the
closed-loopgainandtheloadresistor.TheLT1259/LT1260
have been optimized for ±5V supply operation and have a
–3dBbandwidthof90MHz. Seeresistorselectionguidein
Typical AC Performance table.
Power Supplies
The LT1259/LT1260 will operate from single or split
supplies from ±2V (4V total) to ±15V (30V total). It is not
necessary to use equal value split supplies, however the
offsetvoltageandinvertinginputbiascurrentwillchange.
The offset voltage changes about 500µV per volt of
supply mismatch. The inverting bias current can change
as much as 5µA per volt of supply mismatch though
typically, the change is about 0.1µA per volt.
Capacitance on the Inverting Input
Current feedback amplifiers require resistive feedback
from the output to the inverting input for stable operation.
Take care to minimize the stray capacitance between the
output and the inverting input. Capacitance on the invert-
ing input to ground will cause peaking in the frequency
response (and overshoot in the transient response). See
the section on Demo Board Information.
Slew Rate
The slew rate of a current feedback amplifier is not
independent of the amplifier gain configuration the way
slewrateisinatraditionalopamp.Thisisbecauseboththe
inputstageandtheoutputstagehaveslewratelimitations.
In the inverting mode, and for higher gains in the nonin-
verting mode, the signal amplitude between the input pins
issmallandtheoverallslewrateisthatoftheoutputstage.
For gains less than ten in the noninverting mode, the
overall slew rate is limited by the input stage.
Capacitive Loads
The LT1259/LT1260 can drive capacitive loads directly
when the proper value of feedback resistor is used. The
graph of Maximum Capacitive Load vs Feedback Resistor
should be used to select the appropriate value. The value
shown is for ≤5dB peaking when driving a 150Ω load at a
gain of 2. This is a worst case condition. The amplifier is
7
LT1259/LT1260
W U U
U
APPLICATIO S I FOR ATIO
The input slew rate of the LT1259/LT1260 is approxi-
mately 270V/µs and is set by internal currents and capaci-
tances. The output slew rate is set by the value of the
feedback resistors and internal capacitances. At a gain of
10 with at 1k feedback resistor and ±15V supplies, the
output slew rate is typically 1600V/µs. Larger feedback
resistors will reduce the slew rate as will lower supply
voltages, similar to the way the bandwidth is reduced.
looks like a 4.4pF capacitor in parallel with a 75k resistor,
excluding feedback resistor effects. These amplifiers are
designedtooperatewithopendrainlogic:theENpinshave
internalpullupsandtheamplifiersdrawzerocurrentwhen
these pins are high. To activate an amplifier, its EN pin is
pulled to ground (or at least 2V below the positive supply).
The enable pin current is approximately 60µA when
activated. Input referred switching transients with no
input signal applied are only 35mV positive and 80mV
negative with RL = 100Ω.
The graph of Maximum Undistorted Output vs Frequency
relates the slew rate limitations to sinusoidal input for
various gains.
Output Switching Transient
Large-Signal Transient Response, AV = 2
EN
OUTPUT
LT1259/LT1260 • AI03
RF = RG = 1.6k
RL = 100Ω
VS = ±5V
VIN = 0V
LT1259/LT1260 • AI01
RL = 400Ω
VS = ±15V
RF = RG = 1.6k
The enable/disable times are very fast when driven from
standard 5V logic. The amplifier enables in about 100ns
(50% point to 50% point) while operating on ±5V sup-
plies. Likewise the disable time is approximately 40ns
(50% point to 50% point) or 75ns to 90% of the final
value. The output decay time is set by the output capaci-
tance and load resistor.
Large-Signal Transient Response, AV = 10
Amplifier Enable Time, AV = 10
OUTPUT
LT1259/LT1260 • AI02
EN
VS = ±15V
RF = 1k
RG = 110Ω
RL = 400Ω
Enable/Disable
The LT1259/LT1260 amplifiers have a unique high imped-
ance, zero supply current mode which is controlled by
independent EN pins. When disabled, an amplifier output
LT1259/LT1260 • AI04
RF = 1k
RG = 110Ω
RL = 150Ω
VS = ±5V
VIN = 0.1V
8
LT1259/LT1260
W U U
APPLICATIO S I FOR ATIO
U
Amplifier Disable Time, AV = 10
Amplifier Enable/Disable Time, AV = 2
EN
EN
OUTPUT
OUTPUT
LT1259/LT1260 • AI05
LT1259/LT1260 • AI06
R
L = 150Ω
RF = 1k
RG = 110Ω
R
F = RG = 1.6k
VS = ±5V
IN = 0.1V
VS = ±5V
VIN = 2VPP at 2MHz
V
RL = 100Ω
input pins is small, so this clamp has no effect. In the
disabled mode however, the differential swing can be the
same as the input swing, and the clamp voltage will set the
maximum allowable input voltage.
Differential Input Signal Swing
The differential input swing is limited to about ±6V by an
ESD protection device connected between the inputs. In
normal operation, the differential voltage between the
U
TYPICAL APPLICATIO S
2-Input Video MUX Cable Driver
configuring each amplifier as a unity-gain follower. The
switching time between channels is 100ns when both
EN A and EN B are driven.
The application on the first page shows a low cost, 2-
input video MUX cable driver. The scope photo displays
the cable output of a 30MHz square wave driving 150Ω.
In this circuit the active amplifier is loaded by RF and RG
of the disabled amplifier, but in this case it only causes a
1.2% gain error. The gain error can be eliminated by
2-Input RGB MUX Cable Driver Demonstration Board
A complete 2-input RGB MUX has been fabricated on PC
Demo Board #039A. The board incorporates two LT1260s
with outputs summed through 75Ω back termination
resistors as shown in the schematic. There are several
things to note about Demo Board #039A:
2-Input Video MUX Switching Response
1. The feedback resistors of the disabled LT1260 load
the enabled amplifier and cause a small (1% to 2%)
EN A
gain error depending on the values of R and R .
F
G
EN B
Configure the amplifiers as unity-gain followers to
eliminate this error.
2. The feedback node has minimum trace length connect-
ing RF and RG to minimize stray capacitance.
3. Ground plane is pulled away from RF and RG on both
sides of the board to minimize stray capacitance.
LT1259/LT1260 • TA03
VS = ±5V
IN A = VIN 2 = 2VPP at 2MHz
R
R
F = RG = 1.6k
L = 100Ω
V
9
LT1259/LT1260
U
TYPICAL APPLICATIO S
RGB Demo Board All Hostile Crosstalk
4. Capacitors C1 and C6 are optional and only needed to
reduce overshoot when EN 1 or EN 2 are activated with
a long inductive ground wire.
0
V
= 12V
S
L
F
R
R
R
= 100Ω
= R = 1.6k
–20
–40
G
5. The R, G and B amplifiers have slightly different
frequency responses due to different output trace
routing to RF (between pins 3 and 4). All amplifiers
have slightly less bandwidth in PCB #039 than when
measured alone as shown in the Typical AC Perfor-
mance table.
= 10Ω
S
G
B
R
–60
–80
6. Part-to-part variation can change the peaking by
–100
±0.25dB.
1
10
FREQUENCY (MHz)
100
LT1259/60 • TA06
RGB Demo Board Gain vs Frequency
4
V
=
12V
S
L
F
R
= 150Ω
P-DIP PC Board #039
R = R = 1.6k
2
0
G
R
G
V+
U1
V–
GND
EN2
R1
EN1
B
C1
–2
–4
–6
R1
R13
R14
R2
C2
R3
R4
R
G1
C3
R15
1
10
FREQUENCY (MHz)
100
R5
R6
LT1259/60 • TA04
C4
C5
G
B
B1
R2
C6
RGB Demo Board Gain vs Frequency
U2
R7
R8
4
2
R16
V
R
R
= 5V
S
L
F
C7
= 150Ω
R9
R10
= R = 1.1k
G
R17
C8
R18
R, B
G2 R11
0
R12
G
(408) 432-1900
LT1260 RGB AMPLIFIER
DEMONSTRATION BOARD
–2
–4
–6
B2
LT1259/60 • TA07
1
10
FREQUENCY (MHz)
100
LT1259/60 • TA05
10
LT1259/LT1260
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
0.130 ± 0.005
(3.302 ± 0.127)
(1.143 – 1.651)
14
13
12
11
10
9
8
7
0.015
(0.380)
MIN
0.255 ± 0.015*
(6.477 ± 0.381)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.025
1
2
3
5
6
4
0.325
0.005
(0.125)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
–0.015
0.125
(3.175)
MIN
0.018 ± 0.003
+0.635
8.255
(0.457 ± 0.076)
(
)
–0.381
N14 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N Package
16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
0.300 – 0.325
0.130 ± 0.005
0.045 – 0.065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
14
12
10
9
8
15
13
11
16
0.015
(0.381)
MIN
0.255 ± 0.015*
0.065 (6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
(1.651)
TYP
+0.025
–0.015
2
1
3
4
6
5
7
0.325
0.005
(0.127)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
+0.635
8.255
N16 0695
(
)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
0.010 – 0.020
(0.254 – 0.508)
14
13
12
11
10
9
8
0.053 – 0.069
(1.346 – 1.752)
× 45°
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
0.016 – 0.050
0.406 – 1.270
*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
S14 0695
1
2
3
4
5
6
7
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
0.010 – 0.020
16
15
14
13
12
11
10
9
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
0.016 – 0.050
0.406 – 1.270
*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
1
2
3
4
5
6
7
8
S16 0695
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1259/LT1260
U
TYPICAL APPLICATIO
Demonstration PC Board Schematic #039
+
–
EN 1 EN 2
V
V
GND
C1*
0.01µF
R1
R2
1
2
3
4
5
6
7
8
16
–
R13
R
75Ω
15
14
13
12
11
10
9
R1
V
OUT
V
OUT
V
OUT
RED
+
LT1260
R3
R6
C2
–
+
R14
75Ω
0.1µF
G
B
G1
B1
GREEN
BLUE
R4
C3
0.1µF
+
–
R15
75Ω
R5
C4
4.7µF
+
C6*
0.01µF
+
R7
R8
C5
4.7µF
1
2
16
15
14
13
12
11
10
9
–
+
R16
R
75Ω
R2
3
LT1260
C7
0.1µF
R9
4
–
R17
75Ω
G
B
5
G2
B2
+
R10
6
C8
0.1µF
7
+
–
R18
75Ω
R12
8
LT1259/60 • TA08
R11
*OPTIONAL
RELATED PARTS
PART NUMBER
LT1203/LT1205
LT1204
DESCRIPTION
COMMENTS
150MHz Video Multiplexers
2:1 and Dual 2:1 MUXes with 25ns Switch Time
Cascadable Enable 64:1 Multiplexing
4-Input Video MUX with Current Feedback Amplifier
140MHz Current Feedback Amplifier
Low Cost Video Amplifiers
LT1227
1100V/µs Slew Rate, Shutdown Mode
LT1252/LT1253/LT1254
Single, Dual and Quad Current Feedback Amplifiers
125960fas, sn125960 LT/TP 1197 REV A 4K • PRINTED IN USA
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
12
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1993
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