LT1207
Dual 250mA/60MHz
Current Feedback Amplifier
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
250mA Minimum Output Drive Current
60MHz Bandwidth, A
V
= 2, R
L
= 100Ω
900V/µs Slew Rate, A
V
= 2, R
L
= 50Ω
0.02% Differential Gain, A
V
= 2, R
L
= 30Ω
0.17° Differential Phase, A
V
= 2, R
L
= 30Ω
High Input Impedance: 10MΩ
Shutdown Mode: I
S
< 200µA per Amplifier
Stable with C
L
= 10,000pF
APPLICATIO S
s
s
s
s
s
s
ADSL/HDSL Drivers
Video Amplifiers
Cable Drivers
RGB Amplifiers
Test Equipment Amplifiers
Buffers
The LT
®
1207 is a dual version of the LT1206 high speed
current feedback amplifier. Like the LT1206, each CFA in
the dual has excellent video characteristics: 60MHz band-
width, 250mA minimum output drive current, 400V/µs
minimum slew rate, low differential gain (0.02% typ) and
low differential phase (0.17° typ). The LT1207 includes a
pin for an optional compensation network which stabi-
lizes the amplifier for heavy capacitive loads. Both ampli-
fiers have thermal and current limit circuits which protect
against fault conditions. These capabilities make the LT1207
well suited for driving difficult loads such as cables in video
or digital communication systems.
Operation is fully specified from
±5V
to
±15V
supplies.
Supply current is typically 20mA per amplifier. Two
micropower shutdown controls place each amplifier in a
high impedance low current mode, dropping supply
current to 200µA per amplifier. For reduced bandwidth
applications, supply current can be lowered by adding a
resistor in series with the Shutdown pin.
The LT1207 is manufactured on Linear Technology's
complementary bipolar process and is available in a low
thermal resistance 16-lead SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V
V
IN
SHDN A
HDSL Driver
+
0.1µF*
2.2µF**
+
1/2 LT1207
–
720Ω
15k
240Ω
720Ω
720Ω
62Ω
L1
–
SHDN B
15k
1/2 LT1207
62Ω
+
+
–5V
0.1µF*
2.2µF**
U
* CERAMIC
** TANTALUM
L1 = TRANSPOWER SMPT–308
OR SIMILAR DEVICE
1207 • TA01
U
U
1
LT1207
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
+
1
–IN A 2
+IN A 3
SHDN A 4
–IN B 5
+IN B 6
SHDN B 7
V
+
8
16 V
+
15 OUT A
14 V
–
A
13 COMP A
12 OUT B
11 V
–
B
10 COMP B
9
V
+
Supply Voltage .....................................................
±18V
Input Current per Amplifier ...............................
±15mA
Output Short-Circuit Duration (Note 1) ....... Continuous
Specified Temperature Range (Note 2) ...... 0°C to 70°C
Operating Temperature Range ............... – 40°C to 85°C
Junction Temperature ......................................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
LT1207CS
S PACKAGE
16-LEAD PLASTIC SO
θ
JA
= 40°C/W (NOTE 3)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
Input Offset Voltage Drift
I
IN+
I
IN–
e
n
+ i
n
– i
n
R
IN
C
IN
Noninverting Input Current
Inverting Input Current
Input Noise Voltage Density
Input Noise Current Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
CMRR
Common Mode Rejection Ratio
Inverting Input Current
Common Mode Rejection
PSRR
Power Supply Rejection Ratio
T
A
= 25°C
T
A
= 25°C
V
CM
= 0,
±5V ≤
V
S
≤ ±15V,
pulse tested, V
SHDN A
= 0V, V
SHDN B
= 0V, unless otherwise noted.
CONDITIONS
q
q
q
MIN
TYP
±3
10
±2
±10
MAX
±10
±15
±5
±20
±60
±100
UNITS
mV
mV
µV/°C
µA
µA
µA
µA
nV/√Hz
pA/√Hz
pA/√Hz
MΩ
MΩ
pF
V
V
dB
dB
T
A
= 25°C
q
f = 10kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 0Ω
f = 10kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 10k
f = 10kHz, R
F
= 1k, R
G
= 10Ω, R
S
= 10k
V
IN
=
±12V,
V
S
=
±15V
V
IN
=
±2V,
V
S
=
±5V
V
S
=
±15V
V
S
=
±15V
V
S
=
±5V
V
S
=
±15V,
V
CM
=
±12V
V
S
=
±5V,
V
CM
=
±2V
V
S
=
±15V,
V
CM
=
±12V
V
S
=
±5V,
V
CM
=
±2V
V
S
=
±5V
to
±15V
q
q
q
q
q
q
q
q
q
3.6
2
30
1.5
0.5
±12
±2
55
50
10
5
2
±13.5
±3.5
62
60
0.1
0.1
60
77
10
10
2
U
µA/V
µA/V
dB
W
U
U
W W
W
LT1207
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Noninverting Input Current
Power Supply Rejection
Inverting Input Current
Power Supply Rejection
A
V
R
OL
V
OUT
Large-Signal Voltage Gain
Transresistance,
∆V
OUT
/∆I
IN–
Maximum Output Voltage Swing
V
CM
= 0,
±5V ≤
V
S
≤ ±15V,
pulse tested, V
SHDN A
= 0V, V
SHDN B
= 0V, unless otherwise noted.
CONDITIONS
V
S
=
±5V
to
±15V
V
S
=
±5V
to
±15V
V
S
=
±15V,
V
OUT
=
±10V,
R
L
= 50Ω
V
S
=
±5V,
V
OUT
=
±2V,
R
L
= 25Ω
V
S
=
±15V,
V
OUT
=
±10V,
R
L
= 50Ω
V
S
=
±5V,
V
OUT
=
±2V,
R
L
= 25Ω
V
S
=
±15V,
R
L
= 50Ω, T
A
= 25°C
V
S
=
±5V,
R
L
= 25Ω, T
A
= 25°C
q
q
q
q
q
q
q
q
MIN
TYP
30
0.7
MAX
500
5
UNITS
nA/V
µA/V
dB
dB
kΩ
kΩ
V
V
V
V
55
55
100
75
±11.5
±10.0
±2.5
±2.0
250
71
68
260
200
±12.5
±3.0
500
20
1200
30
35
17
200
10
I
OUT
I
S
Maximum Output Current
Supply Current per Amplifier
Supply Current per Amplifier,
R
SHDN
= 51k (Note 4)
Positive Supply Current
per Amplifier, Shutdown
Output Leakage Current, Shutdown
R
L
= 1Ω
V
S
=
±15V,
V
SHDN
= 0V, T
A
= 25°C
q
q
mA
mA
mA
mA
µA
µA
V/µs
%
DEG
MHz
MHz
MHz
MHz
V
S
=
±15V,
T
A
= 25°C
V
S
=
±15V,
V
SHDN A
= 15V, V
SHDN B
= 15V
V
S
=
±15V,
V
SHDN
= 15V, V
OUT
= 0V
A
V
= 2, T
A
= 25°C
V
S
=
±15V,
R
F
= 560Ω, R
G
= 560Ω, R
L
= 30Ω
V
S
=
±15V,
R
F
= 560Ω, R
G
= 560Ω, R
L
= 30Ω
V
S
=
±15V,
Peaking
≤
0.5dB
R
F
= R
G
= 620Ω, R
L
= 100Ω
V
S
=
±15V,
Peaking
≤
0.5dB
R
F
= R
G
= 649Ω, R
L
= 50Ω
V
S
=
±15V,
Peaking
≤
0.5dB
R
F
= R
G
= 698Ω, R
L
= 30Ω
V
S
=
±15V,
Peaking
≤
0.5dB
R
F
= R
G
= 825Ω, R
L
= 10Ω
q
q
12
SR
Slew Rate (Note 5)
Differential Gain (Note 6)
Differential Phase (Note 6)
400
900
0.02
0.17
60
52
43
27
BW
Small-Signal Bandwidth
The
q
denotes specifications which apply for 0°C
≤
T
A
≤
70°C.
Note 1:
Applies to short circuits to ground only. A short circuit between
the output and either supply may permanently damage the part when
operated on supplies greater than
±10V.
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 tested over – 40°C to 85°C are
available on special request. Consult factory.
Note 3:
Thermal resistance
θ
JA
varies from 40°C/W to 60°C/W depending
upon the amount of PC board metal attached to the device.
θ
JA
is specified
for a 2500mm
2
test board covered with 2oz copper on both sides.
Note 4:
R
SHDN
is connected between the Shutdown pin and ground.
Note 5:
Slew rate is measured at
±5V
on a
±10V
output signal while
operating on
±15V
supplies with R
F
= 1.5k, R
G
= 1.5k and R
L
= 400Ω.
Note 6:
NTSC composite video with an output level of 2V.
3
LT1207
S ALL-SIG AL BA DWIDTH
I
S
= 20mA per Amplifier Typical, Peaking
≤
0.1dB
A
V
R
L
R
F
R
G
562
649
732
–
–
–
576
649
750
48.7
56.2
71.5
– 3dB BW
(MHz)
48
34
22
54
36
22.4
48
35
22.4
40
31
20
– 0.1dB BW
(MHz)
21.4
17
12.5
22.3
17.5
11.5
20.7
18.1
11.7
19.2
16.5
10.2
A
V
R
L
R
F
R
G
681
768
887
–
–
–
665
787
931
536
64.9
84.5
– 3dB BW
(MHz)
50
35
24
66
37
23
55
36
22.5
44
33
20.7
– 0.1dB BW
(MHz)
19.2
17
12.3
22.4
17.5
12
23
18.5
11.8
20.7
17.5
10.8
V
S
=
±5V,
R
SHDN
= 0Ω
–1
150
562
30
649
10
732
1
150
619
30
715
10
806
2
150
576
30
649
10
750
10
150
442
30
511
10
649
I
S
= 10mA per Amplifier Typical, Peaking
≤
0.1dB
A
V
R
L
R
F
R
G
576
681
750
–
–
–
590
681
768
33.2
43.2
54.9
– 3dB BW
(MHz)
35
25
16.4
37
25
16.5
35
25
16.2
31
23
15
– 0.1dB BW
(MHz)
17
12.5
8.7
17.5
12.6
8.2
16.8
13.4
8.1
15.6
11.9
7.8
A
V
R
L
R
F
R
G
634
768
866
–
–
–
649
787
931
33.2
44.2
64.9
– 3dB BW
(MHz)
41
26.5
17
44
28
16.8
40
27
16.5
33
25
15.3
– 0.1dB BW
(MHz)
19.1
14
9.4
18.8
14.4
8.3
18.5
14.1
8.1
15.6
13.3
7.4
V
S
=
±5V,
R
SHDN
= 10.2k
–1
150
576
30
681
10
750
1
150
665
30
768
10
845
2
150
590
30
681
10
768
10
150
301
30
392
10
499
I
S
= 5mA per Amplifier Typical, Peaking
≤
0.1dB
A
V
–1
R
L
150
30
10
150
30
10
150
30
10
150
30
10
R
F
604
715
681
768
866
825
634
750
732
100
100
100
R
G
604
715
681
–
–
–
634
750
732
11.1
11.1
11.1
– 3dB BW
(MHz)
21
14.6
10.5
20
14.1
9.8
20
14.1
9.6
16.2
13.4
9.5
– 0.1dB BW
(MHz)
10.5
7.4
6.0
9.6
6.7
5.1
9.6
7.2
5.1
5.8
7.0
4.7
A
V
–1
R
L
150
30
10
150
30
10
150
30
10
150
30
10
R
F
619
787
825
845
1k
1k
681
845
866
100
100
100
R
G
619
787
825
–
–
–
681
845
866
11.1
11.1
11.1
– 3dB BW
(MHz)
25
15.8
10.5
23
15.3
10
23
15
10
15.9
13.6
9.6
– 0.1dB BW
(MHz)
12.5
8.5
5.4
10.6
7.6
5.2
10.2
7.7
5.4
4.5
6
4.5
V
S
=
±5V,
R
SHDN
= 22.1k
1
2
10
4
U
U
W
V
S
=
±15V,
R
SHDN
= 0Ω
–1
150
681
30
768
10
887
1
150
768
30
909
10
1k
2
150
665
30
787
10
931
10
150
487
30
590
10
768
V
S
=
±15V,
R
SHDN
= 60.4k
–1
150
634
30
768
10
866
1
150
768
30
909
10
1k
2
150
649
30
787
10
931
10
150
301
30
402
10
590
V
S
=
±15V,
R
SHDN
= 121k
1
2
10
LT1207
TYPICAL PERFOR A CE CHARACTERISTICS
Bandwidth vs Supply Voltage
100
90
PEAKING
≤
0.5dB
PEAKING
≤
5dB
R
F
= 470Ω
R
F
= 560Ω
R
F
= 680Ω
A
V
= 2
R
L
= 100Ω
–3dB BANDWIDTH (MHz)
FEEDBACK RESISTOR (Ω)
– 3dB BANDWIDTH (MHz)
80
70
60
50
40
30
20
10
0
4
6
14
12
10
8
SUPPLY VOLTAGE (±V)
16
18
R
F
= 1k
R
F
= 1.5k
R
F
= 750Ω
LT1207 • TPC01
Bandwidth vs Supply Voltage
100
90
PEAKING
≤
0.5dB
PEAKING
≤
5dB
A
V
= 10
R
L
= 100Ω
– 3dB BANDWIDTH (MHz)
–3dB BANDWIDTH (MHz)
80
70
60
50
40
30
20
10
0
4
6
14
12
10
8
SUPPLY VOLTAGE (±V)
16
18
R
F
= 680Ω
R
F
= 1.5k
R
F
= 470Ω
R
F
=390Ω
R
F
= 330Ω
FEEDBACK RESISTOR (Ω)
LT1207 • TPC04
Differential Phase
vs Supply Voltage
0.50
R
L
= 15Ω
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (DEG)
0.40
0.08
R
L
= 15Ω
SPOT NOISE (nV/√Hz OR pA/√Hz)
0.30
0.20
R
F
= R
G
= 560Ω
A
V
= 2
N PACKAGE
R
L
= 30Ω
R
L
= 50Ω
R
L
= 150Ω
0.10
0
5
7
11
13
9
SUPPLY VOLTAGE (±V)
15
LT1207 • TPC07
U W
Bandwidth vs Supply Voltage
50
PEAKING
≤
0.5dB
PEAKING
≤
5dB
40
R
F
= 560Ω
30
R
F
= 750Ω
R
F
= 1k
R
F
= 2k
10
A
V
= 2
R
L
= 10Ω
Bandwidth and Feedback Resistance
vs Capacitive Load for 0.5dB Peak
10k
BANDWIDTH
–3dB BANDWIDTH (MHz)
100
1k
FEEDBACK RESISTOR
A
V
= 2
R
L
=
∞
V
S
=
±15V
C
COMP
= 0.01µF
1
100
10
1000
CAPACITIVE LOAD (pF)
10
20
0
4
6
14
12
10
8
SUPPLY VOLTAGE (±V)
16
18
100
1
10000
LT1207 • TPC02
LT1207 • TPC03
Bandwidth vs Supply Voltage
50
PEAKING
≤
0.5dB
PEAKING
≤
5dB
40
A
V
= 10
R
L
= 10Ω
Bandwidth and Feedback Resistance
vs Capacitive Load for 5dB Peak
10k
BANDWIDTH
100
–3dB BANDWIDTH (MHz)
30
R
F
= 560Ω
R
F
= 680Ω
R
F
= 1k
1k
10
20
10
R
F
= 1.5k
FEEDBACK RESISTOR
0
4
6
14
12
10
8
SUPPLY VOLTAGE (±V)
16
18
0
100
1
A
V
= +2
R
L
=
∞
V
S
=
±15V
C
COMP
= 0.01µF
10
100
1k
CAPACITIVE LOAD (pF)
1
10k
LT1207 • TPC05
LT1207 • TPC06
Differential Gain
vs Supply Voltage
0.10
R
F
= R
G
= 560Ω
A
V
= 2
N PACKAGE
100
Spot Noise Voltage and Current
vs Frequency
–i
n
0.06
R
L
= 30Ω
0.04
R
L
= 50Ω
10
e
n
i
n
1
10
0.02
R
L
= 150Ω
0
5
7
11
13
9
SUPPLY VOLTAGE (±V)
15
100
1k
10k
FREQUENCY (Hz)
100k
LT1207 • TPC09
LT1207 • TPC08
5
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