LINEAR TECHNOLOGY LT1969 Technical data
Adjustable Current Operational Amplifier
LINE VOLTAGE (V
P-P
)
0
HARMONIC DISTORTION (dBc)
–60
–70
–80
–90
–100
1969 TA01b
2 4 6 8 10 12 14 16
VS = 12V
A
V
= 10
f = 200kHz
100Ω LINE
1:2 TRANSFORMER
HD2
HD3
FEATURES
■
700MHz Gain Bandwidth
■
±200mA Minimum I
■
Adjustable Quiescent Current
■
Low Distortion: –72dBc at 1MHz, 4V
■
Stable in AV ≥ 10, Simple Compensation for AV < 10
■
±4.3V Minimum Output Swing, VS = ±6V, RL = 25Ω
■
Stable with 1000pF Load
■
6nV/√Hz Input Noise Voltage
■
2pA/√Hz Input Noise Current
■
4mV Maximum Input Offset Voltage
■
4µA Maximum Input Bias Current
■
400nA Maximum Input Offset Current
■
±4.5V Minimum Input CMR, VS = ±6V
■
Specified at ±6V, ±2.5V
OUT
, 25Ω, AV = 2
P-P
U
APPLICATIO S
■
DSL Modems
■
xDSL PCI Cards
■
USB Modems
■
Line Drivers
LT1969
Dual 700MHz, 200mA,
U
DESCRIPTIO
The LT®1969 is an adjustable current version of the
popular LT1886, a 200mA minimum output current, dual
op amp with outstanding distortion performance. The
adjustable current feature is highly desirable in applications where minimum power dissipation is required while
still being able to provide adequate line termination.
At nominal supply current, the amplifiers are gain of 10
stable and can easily be compensated for lower gains. The
LT1969 features balanced high impedance inputs with
4µA input bias current and 4mV maximum input offset
voltage. Single supply applications are easy to implement
and have lower total noise than current feedback amplifier
implementations.
The output drives a 25Ω load to ±4.3V with ±6V supplies.
On ±2.5V supplies, the output swings ±1.5V with a 100Ω
load. The amplifier is stable with a 1000pF capacitive load
making it useful in buffer and cable driver applications.
The LT1969 is manufactured on Linear Technology’s
advanced low voltage complementary bipolar process and
is available in a thermally enhanced MS10 package
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
0.1µF
+
IN
1µF
0.1µF
–
IN
10k 20k
U
Single 12V Supply ADSL Modem Line Driver
12V
+
1/2 LT1969
–
100Ω
1µF
20k10k
100Ω
–
1/2 LT1969
+
909Ω
909Ω
12.4Ω
12.4Ω
1:2*
CTRL1 CTRL2
6
13k
STANDBY
LOW POWER
*COILCRAFT X8390-A
OR EQUIVALENT
I
ON = 14mA
Q
LOW POWER = 2mA
I
Q
7
49.9k
ON
STANDBY = 600µA
I
Q
STANDBY ON
LOGIC
OUTPUT
1969 TA01a
100Ω
ADSL Modem Line Driver Distortion
1
LT1969
WW
W
ABSOLUTE MAXIMUM RATINGS
U
PACKAGE
/
O
RDER I FOR ATIO
WU
U
(Note 1)
Total Supply Voltage (V+ to V–) ........................... 13.2V
Input Current (Note 2) ....................................... ±10mA
Input Voltage (Note 2) ............................................ ±V
Maximum Continuous Output Current (Note 3)
DC ............................................................... ±100mA
AC ............................................................... ±300mA
Operating Temperature Range (Note 10) –40°C to 85°C
Specified Temperature Range (Note 9).. – 40°C to 85°C
TOP VIEW
S
+
V
1
2
OUTA
3
–INA
4
+INA
–
5
V
MS10 PACKAGE
10-LEAD PLASTIC MSOP
T
= 150°C, θJA = 110°C/W (NOTE 4)
JMAX
10
OUTB
9
–INB
8
+INB
7
CTRL2
6
CTRL1
ORDER PART
NUMBER
LT1969CMS
MS10 PART MARKING
LTTN
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
erature range, otherwise specifications are at TA = 25°C. VS = ±6V, VCM = 0V, nominal mode with a 13k resistor from CTRL1 to V– and
a 49.9k resistor from CTRL2 to V–, pulse power tested unless otherwise noted. (Note 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
I
OS
I
B
e
n
i
n
R
IN
C
IN
CMRR Common Mode Rejection Ratio VCM = ±4.5V ● 77 98 dB
PSRR Power Supply Rejection Ratio VS = ±2V to ±6.5V 80 86 dB
A
VOL
V
OUT
Input Offset Voltage (Note 5) 1 4 mV
Input Offset Voltage Drift (Note 8) ● 317µV/°C
Input Offset Current 150 400 nA
Input Bias Current 1.5 4 µA
Input Noise Voltage f = 10kHz 6 nV/√Hz
Input Noise Current f = 10kHz 2 pA/√Hz
Input Resistance VCM = ±4.5V 5 10 MΩ
Differential 35 kΩ
Input Capacitance 2pF
Input Voltage Range (Positive) ● 4.5 5.9 V
Input Voltage Range (Negative)
Minimum Supply Voltage Guaranteed by PSRR ● ±2V
Large-Signal Voltage Gain V
Output Swing RL = 100Ω, 10mV Overdrive 4.85 5 ±V
= ±4V, RL = 100Ω 5.0 12 V/mV
OUT
V
= ±4V, RL = 25Ω 4.5 12 V/mV
OUT
RL = 25Ω, 10mV Overdrive 4.30 4.6 ±V
I
= 200mA, 10mV Overdrive 4.30 4.5 ±V
OUT
The ● denotes specifications which apply over the full operating temp-
● 5mV
● 600 nA
● 6 µA
● –5.2 –4.5 V
● 78 dB
● 4.5 V/mV
● 4.0 V/mV
● 4.70 ±V
● 4.10 ±V
● 4.10 ±V
2
LT1969
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±6V, VCM = 0V, nominal mode with a 13k resistor from CTRL1 to V– and
a 49.9k resistor from CTRL2 to V–, pulse power tested unless otherwise noted. (Note 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
SC
SR Slew Rate AV = –10 (Note 6) 100 200 V/µs
GBW Gain Bandwidth f = 1MHz 700 MHz
tr, t
t
S
IMD Intermodulation Distortion AV = 10, f = 0.9MHz, 1MHz, 14dBm, RL = 100Ω/25Ω –81/–80 dBc
R
OUT
I
S
Short-Circuit Current (Sourcing) (Note 3) 700 mA
Short-Circuit Current (Sinking) 500 mA
Full Power Bandwidth 4V Peak (Note 7) 8 MHz
Rise Time, Fall Time AV = 10, 10% to 90% of 0.1V, RL = 100Ω 4ns
f
Overshoot AV = 10, 0.1V, RL = 100Ω 1%
Propagation Delay AV = 10, 50% VIN to 50% V
Settling Time 6V Step, 0.1% 50 ns
Harmonic Distortion HD2, AV = 10, 2V
= 10, 2V
HD3, A
V
Output Resistance AV = 10, f = 1MHz 0.1 Ω
Supply Current Per Amplifier 7 8.25 mA
CTRL1 Voltage 13k to V–, Measured with Respect to V
CTRL2 Voltage 49.9k to V–, Measured with Respect to V
Minimum Supply Current per Amplifier; CTRL1, CTRL2 Open 300 800 µA
Maximum Supply Current per Amplifier; CTRL1 or CTRL2 Shorted to V
, f = 1MHz, RL = 100Ω/25Ω –75/–63 dBc
P-P
, f = 1MHz, RL = 100Ω/25Ω –85/–71 dBc
P-P
, 0.1V, RL = 100Ω 2.5 ns
OUT
● 8.50 mA
–
–
–
0.77 0.97 1.25 V
● 0.74 1.30 V
0.87 1.05 1.18 V
● 0.80 1.25 V
● 1100 µA
13 mA
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VS = ±2.5V, VCM = 0V, nominal mode with a 13k resistor from CTRL1 to V– and a 49.9k resistor from CTRL2 to V–, pulse power tested
unless otherwise noted. (Note 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
I
OS
I
B
e
n
i
n
R
IN
C
IN
CMRR Common Mode Rejection Ratio VCM = ±1V ● 75 91 dB
Input Offset Voltage (Note 5) 1.5 5 mV
● 6mV
Input Offset Voltage Drift (Note 8) ● 517µV/°C
Input Offset Current 100 350 nA
● 550 nA
Input Bias Current 1.2 3.5 µA
● 5.5 µA
Input Noise Voltage f = 10kHz 6 nV/√Hz
Input Noise Current f = 10kHz 2 pA/√Hz
Input Resistance VCM = ±1V 10 20 MΩ
Differential 50 kΩ
Input Capacitance 2pF
Input Voltage Range (Positive) ● 1 2.4 V
Input Voltage Range (Negative)
● –1.7 –1 V
3
LT1969
ELECTRICAL CHARACTERISTICS
erature range, otherwise specifications are at TA = 25°C. VS = ±2.5V, VCM = 0V, nominal mode with a 13k resistor from CTRL1 to V
The ● denotes specifications which apply over the full operating temp-
–
and a 49.9k resistor from CTRL2 to V–, pulse power tested unless otherwise noted. (Note 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
A
VOL
V
OUT
I
SC
SR Slew Rate AV = –10 (Note 6) 50 100 V/µs
GBW Gain Bandwidth f = 1MHz 530 MHz
tr, t
IMD Intermodulation Distortion AV = 10, f = 0.9MHz, 1MHz, 5dBm, RL = 100Ω/25Ω – 77/–85 dBc
R
OUT
I
S
Large-Signal Voltage Gain V
= ±1V, RL = 100Ω 5.0 10 V/mV
OUT
V
= ±1V, RL = 25Ω 4.5 10 V/mV
OUT
● 4.5 V/mV
● 4.0 V/mV
Output Swing RL = 100Ω, 10mV Overdrive 1.50 1.65 ±V
● 1.40 ±V
RL = 25Ω, 10mV Overdrive 1.35 1.50 ±V
● 1.25 ±V
I
= 200mA, 10mV Overdrive 0.87 1 ±V
OUT
● 0.80 ±V
Short-Circuit Current (Sourcing) (Note 3) 500 mA
Short-Circuit Current (Sinking) 400 mA
Full Power Bandwidth 1V Peak (Note 7) 16 MHz
Rise Time, Fall Time AV = 10, 10% to 90% of 0.1V, RL = 100Ω 7ns
f
Overshoot AV = 10, 0.1V, RL = 100Ω 5%
Propagation Delay AV = 10, 50% VIN to 50% V
Harmonic Distortion HD2, AV = 10, 2V
= 10, 2V
HD3, A
V
, f = 1MHz, RL = 100Ω/25Ω –75/–64 dBc
P-P
, f = 1MHz, RL = 100Ω/25Ω – 80/–66 dBc
P-P
, 0.1V, RL = 100Ω 5ns
OUT
Output Resistance AV = 10, f = 1MHz 0.2 Ω
Channel Separation V
= ±1V, RL = 25Ω 82 92 dB
OUT
● 80 dB
Supply Current Per Amplifier 5 6.00 mA
● 6.25 mA
CTRL1 Voltage 13k to V–, Measured with Respect to V
CTRL2 Voltage 49.9k to V–, Measured with Respect to V
–
–
0.77 0.95 1.25 V
● 0.74 1.30 V
0.87 1.03 1.18 V
● 0.80 1.25 V
Minimum Supply Current per Amplifier; CTRL1, CTRL2 Open 250 650 µA
● 750 µA
Maximum Supply Current per Amplifier; CTRL1 or CTRL2 Shorted to V
–
11.5 mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 0.7V, the input current should be limited to less than
10mA.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 4: Thermal resistance varies depending upon the amount of PC board
metal attached to the device. θ
is specified for a 2500mm2 test board
JA
covered with 2 oz copper on both sides.
Note 5: Input offset voltage is exclusive of warm-up drift.
4
Note 6: Slew rate is measured between ±2V on a ±4V output with ±6V
supplies, and between ±1V on a ±1.5V output with ±2.5V supplies. Falling
slew rate is guaranteed by correlation to rising slew rate.
Note 7: Full power bandwidth is calculated from the slew rate:
FPBW = SR/2πV
.
P
Note 8: This parameter is not 100% tested.
Note 9: The LT1969C is guaranteed to meet specified performance from 0°C
to 70°C. The LT1969C is designed, characterized and expected to meet
specified performance from –40°C to 85°C but is not tested or QA sampled
at these temperatures.
Note 10: The LT1969C is guaranteed functional over the operating temperature
range of –40°C to 85°C.
UW
TEMPERATURE (°C)
–50
–1.5
–1.0
V
+
25 75
1969 G44
1.5
1.0
–25 0
50 100 125
0.5
V
–
–0.5
OUTPUT SATURATION VOLTAGE (V)
200mA
200mA
150mA
RL = 100Ω
RL = 100Ω
VS = ±6V
150mA
TYPICAL PERFOR A CE CHARACTERISTICS
13k resistor from CTRL1 to V– and a 49.9k resistor from CTRL2 to V
–
LT1969
Supply Current vs Temperature
20
18
16
14
12
10
8
6
4
2
SUPPLY CURRENT, BOTH AMPLIFIERS (mA)
0
–50
–25
0
VS = ±6V
VS = ±2.5V
50
25
TEMPERATURE (°C)
75
Input Bias Current
vs Temperature
3.5
3.0
2.5
2.0
1.5
1.0
INPUT BIAS CURRENT (µA)
0.5
IB = (I
B
+
– I
–
)/2
B
VS = ±2.5V
VS = ±6V
100
1969 G01
–0.1
–0.2
–0.3
1.5
1.0
COMMON MODE RANGE (V)
0.5
125
100
10
INPUT VOLTAGE NOISE (nV/√Hz)
Input Common Mode Range
vs Supply Voltage
+
V
TA = 25°C
> 1mV
∆V
OS
–
V
0 2 4 6 8 10 12 14
TOTAL SUPPLY VOLTAGE (V)
Input Noise Spectral Density
TA = 25°C
= 101
A
V
e
n
i
n
1969 G02
100
10
INPUT CURRENT NOISE (pA/√Hz)
Input Bias Current
vs Input Common Mode Voltage
3.0
TA = 25°C
= (I
+
+ I
–
I
B
2.5
2.0
1.5
1.0
INPUT BIAS CURRENT (µA)
0.5
0
–6 –2 2–4 0 4 6
)/2
B
B
VS = ±6V
VS = ±2.5V
INPUT COMMON MODE VOLTAGE (V)
Output Saturation Voltage
vs Temperature
1969 G03
0
–50
–25 0
Output Saturation Voltage
vs Temperature
+
V
VS = ±2.5V
–0.5
–1.0
–1.5
1.5
1.0
0.5
OUTPUT SATURATION VOLTAGE (V)
–
V
–50
150mA
150mA
–25 0
50 100 125
25 75
TEMPERATURE (°C)
RL = 100Ω
200mA
25 75
TEMPERATURE (°C)
200mA
RL = 100Ω
50 100 125
1969 G43
1969 G45
1
10
1k 100k100 10k
FREQUENCY (Hz)
Output Short-Circuit Current
vs Temperature
1000
900
800
700
600
500
400
300
200
100
OUTPUT SHORT-CIRCUIT CURRENT (mA)
0
–50
–25
SOURCE
V
= ±6V
S
SOURCE
= ±2.5V
V
S
SINK
V
= ±6V
S
25
0
TEMPERATURE (°C)
V
S
50
SINK
= ±2.5V
75
1969 G04
100
1969 G46
1
125
Settling Time vs Output Step
6
VS = ±6V
4
2
0
–2
OUTPUT STEP (V)
–4
–6
0204010 30 50 60
10mV 1mV
10mV 1mV
SETTLING TIME (ns)
1886 G05
5
LT1969
FREQUENCY (Hz)
POWER SUPPLY REJECTION (dB)
100k 10M 100M
1969 G14
1M
100
90
80
70
60
50
40
30
20
10
0
(+) SUPPLY
VS = ±6V
A
V
= 10
(–) SUPPLY
FREQUENCY (Hz)
1
0.1
OUTPUT IMPEDANCE (Ω)
10
100k 10M 100M
1969 G08
0.01
1M
100
AV = 100
AV = 10
UW
TYPICAL PERFOR A CE CHARACTERISTICS
13k resistor from CTRL1 to V– and a 49.9k resistor from CTRL2 to V
Gain Bandwidth
Gain and Phase vs Frequency
80
70
60
50
40
30
GAIN (dB)
20
10
0
–10
–20
1M
TA = 25°C
= –10
A
V
= 100Ω
R
L
PHASE
VS = ±2.5V
VS = ±6V
VS = ±2.5V
GAIN
10M 100M 1G
FREQUENCY (Hz)
VS = ±6V
1969 G06
100
80
60
40
PHASE (DEG)
20
0
–20
–40
–60
–80
–100
vs Supply Voltage Output Impedance vs Frequency
800
TA = 25°C
= –10
A
V
700
600
500
GAIN BANDWIDTH (MHz)
400
300
2 4 6 8 10 12 14
0
–
RL = 1k
RL = 100Ω
RL = 25Ω
TOTAL SUPPLY VOLTAGE (V)
1969 G07
Frequency Response
vs Supply Voltage, AV = 10
23
TA = 25°C
22
= 10
A
V
R
= 100Ω
L
21
20
19
18
GAIN (dB)
17
16
15
14
13
1M 100M 1G
VS = ±2.5V
10M
FREQUENCY (Hz)
Frequency Response
vs Supply Voltage, AV = –1
3
2
1
0
–1
–2
TA = 25°C
GAIN (dB)
–3
= –1
A
V
–4
= 100Ω
R
L
= RG = 1k
R
F
–5
= 124Ω
R
C
= 100pF
C
–6
C
SEE FIGURE 2
–7
1M 100M 1G
6
VS = ±2.5V
VS = ±6V
10M
FREQUENCY (Hz)
VS = ±6V
1969 G09
1969 G12
Frequency Response
vs Supply Voltage, AV = –10
23
TA = 25°C
22
= –10
A
V
R
= 100Ω
L
21
20
19
18
GAIN (dB)
17
16
15
14
13
1M 100M 1G
VS = ±2.5V
10M
FREQUENCY (Hz)
VS = ±6V
Frequency Response
vs Capacitive Load
38
VS = ±6V
35
= 25°C
T
A
= 10
A
V
32
NO R
L
29
26
23
GAIN (dB)
20
17
14
11
8
1M 100M 1G
10M
FREQUENCY (Hz)
1000pF
500pF
200pF
100pF
50pF
1969 G10
1969 G13
Frequency Response
vs Supply Voltage, AV = 2
9
8
7
6
5
4
TA = 25°C
GAIN (dB)
3
= 2
A
V
2
R
= 100Ω
L
= RG = 1k
R
F
1
= 124Ω
R
C
= 100pF
C
0
C
SEE FIGURE 3
–1
1M 100M 1G
VS = ±2.5V
VS = ±6V
10M
FREQUENCY (Hz)
Power Supply Rejection
vs Frequency
1969 G11
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