Specified Temperature Range (Note 2) ........ 0°C to 70°C
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (Note 3) ............................. 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 100°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 150°C/W (S8)
ORDER INFORMATION
LEAD FREE FINISH
LT1166CN8#PBF
LT1166CS8#PBF
TAPE AND REEL
LT1166CN8#TRPBF
LT1166CS8#TRPBF
http://www.linear.com/product/LT1166#orderinfo
PART MARKING*
1166
1166
PACKAGE DESCRIPTION
8-LEAD PDIP
8-LEAD PLASTIC SO
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Pin 1 = 2V, Pin 4 = – 2V, Operating current 15mA and R
IN
= 20k, unless
otherwise specified.
PARAMETER
Output Offset Voltage
Input Bias Current
Input Resistance
V
AB
(Top)
V
AB
(Bottom)
Voltage Compliance
Current Compliance
Transconductance
gm
CC2
gm
EE2
gm
CC10
gm
EE10
PSRR
CC
PSRR
EE
Current Limit Voltage
CONDITIONS
Operating Current 15mA to 50mA
Operating Current 15mA to 50mA (Note 4)
Operating Current 15mA to 50mA (Note 5)
Measure Pin 8 to Pin 3, No Load
Measure Pin 5 to Pin 3, No Load
Operating Current = 50mA (Notes 6, 9)
Operating Voltage = ±2V
(Note 7)
Pin 1 = 2V, Pin 4 = –2V
Pin 1 = 2V, Pin 4 = –2V
Pin 1 = 10V, Pin 4 = –10V
Pin 1 = 10V, Pin 4 = –10V
(Note 8)
(Note 8)
Operating Current 15mA to 50mA
Pin 7 Voltage to Pin 3
Pin 6 Voltage to Pin 3
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
50
2
MAX
250
10
26
–26
±10
±50
UNITS
mV
µA
MΩ
mV
mV
V
mA
mho
mho
mho
mho
dB
dB
2
14
–14
±2
±4
0.08
0.08
0.09
0.09
15
20
–20
0.100
0.100
0.125
0.125
19
19
0.13
0.13
0.16
0.16
1.0
–1.0
1.3
–1.3
1.5
–1.5
V
V
1166fa
2
For more information
www.linear.com/LT1166
LT1166
ELECTRICAL CHARACTERISTICS
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:
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 and 85°C are available on special request, consult factory.
Note 3:
T
J
calculated from the ambient temperature T
A
and the power
dissipation P
D
according to the following formulas:
LT1166CN8: T
J
= T
A
+ (P
D
• 100°C/W)
LT1166CS8: T
J
= T
A
+ (P
D
• 150°C/W)
Note 4:
I
TOP
= I
BOTTOM
Note 5:
The input resistance is typically 15MΩ when the loop is closed.
When the loop is open (current limit) the input resistance drops to 200Ω
referred to Pin 3.
Note 6:
Maximum T
J
can be exceeded with 50mA operating current and
simultaneous 10V and –10V (20V total).
Note 7:
Apply ±200mV to Pin 2 and measure current change in Pin 1
and 4. Pin 3 is grounded.
Note 8:
PSRR
CC
= gm
CC2
– gm
CC10
gm
CC2
PSRR
EE
= gm
EE2
– gm
EE10
gm
EE2
Note 9:
For Linear Operation, Pin 1 must not be less than 2V or more than
10V from Pin 3. Similarly, Pin 4 must not be less than 2V or more than
10V from Pin 3.
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs
Current Source Mismatch
150
OUTPUT OFFSET VOLTAGE (mV)
100
INPUT BIAS CURRENT (µA)
50
0
–50
–100
–150
2.5 5.0 7.5
–10 –7.5 –5.0 –2.5 0
CURRENT SOURCE MISMATCH (%)
I
TOP
= I
BOTTOM
= 50mA
800
600
400
200
0
–200
–400
–600
10
–800
–1.0 –0.75 –0.5 –0.25 0 0.25 0.5 0.75 1.0
I
TOP
AND I
BOTTOM
MISMATCH (mA)
LT1166 • TPC02
Output Offset Voltage vs
Current Source Mismatch
60
I
TOP
= I
BOTTOM
= 50mA
R
IN
= 20k
OUTPUT OFFSET VOLTAGE (mV)
55
50
45
40
35
Output Offset Voltage vs
Temperature
R
L
=
∞
I
TOP
= I
BOTTOM
= 15mA
R
IN
= 4.3k
I
TOP
= I
BOTTOM
= 4mA
R
IN
= 2k
30
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
LT1166 • TPC01
LT1166 • TPC03
Input Bias Current vs Temperature
3.0
2.9
INPUT BIAS CURRENT (µA)
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
R
L
=
∞
I
TOP
= I
BOTTOM
= 15mA
R
IN
= 4.3k
10
8
OUTPUT VOLTAGE SWING (V)
6
4
2
0
–2
–4
–6
–8
Output Voltage vs Input Voltage
30
R
IN
= 4.3k
C
1
= C
2
= 500pF
R
L
= 10
SEE FIGURE 8
GAIN (dB)
25
20
15
10
5
0
–5
–10
–15
6
8
10
Open-Loop Voltage Gain vs
Frequency
R
L
=
∞
R
L
=10
R
TOP
= R
BOTTOM
= 1k
I
TOP
= I
BOTTOM
= 12mA
V
S
= ±15V
R
IN
= 4.3k
I
TOP
= I
BOTTOM
= 12mA
C
1
= C
2
= 500pF
SEE FIGURE 8
0.01
0.1
1
FREQUENCY (MHz)
10
LT1166 • TPC06
–10
–10 –8 –6 –4 –2 0 2 4
INPUT VOLTAGE (V)
–20
0.001
LT1166 • TPC04
LT1166 • TPC05
1166fa
For more information
www.linear.com/LT1166
3
LT1166
TYPICAL PERFORMANCE CHARACTERISTICS
Closed-Loop Voltage Gain vs
Frequency
VOLTAGE DROP ACROSS SENSE RESISTORS (mV)
2
1
0
–1
GAIN (dB)
–2
–3
–4
–5
–6
–7
V
S
= ±15V
R
IN
= 4.3k
I
TOP
= I
BOTTOM
= 12mA
C
1
= C
2
= 500pF
SEE FIGURE 8
0.01
0.1
1
FREQUENCY (MHz)
10
LT1166 • TPC07
Voltage Across Sense Resistors
vs Temperature
I
LIM
PIN VOLTAGE REFERENCED TO V
OUT
(V)
24
22
20
18
16
SENSE
+
1.25
Current Limit Pin Voltage vs
Temperature
V
IN
= ±1.5V
1.20
PIN 7 TO PIN 3
R
L
=
∞
R
L
=10
1.15
–16
–18
–20
–22
–24
–50 –25
SENSE
–
50
25
75
0
TEMPERATURE (°C)
100
125
–1.15
–1.20
PIN 6 TO PIN 3
–8
0.001
–1.25
–50 –25
50
0
75
25
TEMPERATURE (°C)
100
125
LT1166 • TPC08
LT1166 • TPC09
Input Transconductance vs
Supply Voltage
0.120
INPUT TRANSCONDUCTANCE (mhos)
TOTAL HARMONIC DISTORTION (%)
0.110
0.100
0.090
0.080
– 55°C
25°C
125°C
10
Total Harmonic Distortion vs
Frequency
R
L
= 10
P
O
= 1W
SEE FIGURE 8
SENSE PIN VOLTAGE REFERENCED TO V
OUT
(mV)
1000
Sense Pin Voltage Referenced to
V
OUT
vs Load Current
V
BOTTOM
V
TOP
gm
CC
1
100
–0.080
–0.090
–0.100
–0.110
–0.120
0
25°C
1
2
125°C
– 55°C
V
IN
= 200mV
R
L
= 0
R
IN
= 0
gm
EE
0.1
10
3 4 5 6 7 8
SUPPLY VOLTAGE (V)
9
10
0.01
0.01
R
SENSE
= 100
1
10
8
6 4 2
SINKING
0
2
4 6 8
SOURCING
10
0.1
1
10
FREQUENCY (kHz)
100
LT1166 • TPC11
LT1166 • TPC10
LOAD CURRENT (mA)
LT1166 • TPC12
1166fa
4
For more information
www.linear.com/LT1166
LT1166
PIN FUNCTIONS
V
TOP
(Pin 1):
Pin 1 establishes the top side drive voltage
for the output transistors. Operating supply current enters
Pin 1 and a portion biases internal circuitry; Pin 1 current
should be greater than 4mA. Pin 1 voltage is internally
clamped to 12V with respect to V
OUT
and the pin current
should be limited to 75mA maximum.
V
IN
(Pin 2):
Pin 2 is the input to a unity gain buffer
which drives V
OUT
(Pin 3). During a fault condition
(short-circuit) the input impedance drops to 200Ω and
the input current must be limited to 5mA or V
IN
to V
OUT
limited to less than ± 6V.
V
OUT
(Pin 3):
Pin 3 of the LT1166 is the output of a volt-
age control loop that maintains the output voltage at the
input voltage.
V
BOTTOM
(Pin 4):
Pin 4 establishes the bottom side drive
voltage for the output transistors. Operating supply cur-
rent exits this pin; Pin 4 current should be greater than
4mA. Pin 4 voltage is internally clamped to –12V with
respect to V
OUT
and the pin current should be limited to
75mA maximum.
SENSE
–
(Pin 5):
The Sense
–
pin voltage is established
by the current control loop and it controls the output qui-
escent current in the bottom side power device. Limit the
maximum differential voltage between Pin 5 and Pin 3 to
± 6V during fault conditions.
I
LIM–
(Pin 6):
The negative side current limit, limits the
voltage at V
BOTTOM
to V
OUT
during a negative fault condi-
tion. The maximum reverse voltage on Pin 6 with respect
to V
OUT
is 6V.
I
LIM+
(Pin 7):
The positive side current limit, limits the
voltage at V
TOP
to V
OUT
during a positive fault condition.
The maximum reverse voltage on Pin 7 with respect to
V
OUT
is –6V.
SENSE
+
(Pin 8):
The Sense
+
pin voltage is established by
the current control loop and it controls the output qui-
escent current in the top side power device. Limit the
maximum differential voltage between Pin 8 and Pin 3 to
1. Introduction
Electronic scales are gradually replacing traditional measuring tools like springs and balances in everyday life, such as electronic price computing scales and electronic weigh...[详细]
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