Datasheet
3
LTC1040
1040fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Applies over input voltage range limit and includes gain
uncertainty.
Note 3: Tracking error = (V
IN1
– V
IN2
)/ V
IN1
.
Note 4: R
IN
is guaranteed by design and is not tested.
R
IN
= 1/(f
S
• 33pF).
Note 5: Average supply current = t
D
• l
S(ON)
• f
S
+ (1 – t
D
x f
S
) • l
S(OFF)
.
Note 6: Response time is set by an internal oscillator and is independent
of overdrive voltage.
Note 7: Inputs and outputs also capable of meeting EIA/JEDEC B series
CMOS specifications.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Peak Supply Current
vs Supply Voltage
SUPPLY VOLTAGE, V
+
(V)
2
0
I
S(ON)
(mA)
2
6
8
10
20
14
6
10
12
LTC1040 • TPC01
4
16
18
12
4
8
14
16
25°C
125°C
–55°C
LTC1040M/LTC1040C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
STROBE Input (Note 7)
V
IH
Logic “1” Input Voltage V
+
= 5.25V ● 2.0 1.6 V
V
IL
Logic “0” Input Voltage V
+
= 4.75V 1.0 0.8 V
R
EXT
External Timing Resistor Resistor Tied Between V
+
and OSC Pin ● 100 10,000 kΩ
f
S
Sampling Frequency R
EXT
= 1M, C
EXT
= 0.1µF 5 Hz
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range otherwise specifications are at T
A
= 25°C. Test conditions: V
+
= 5V, V
–
= –5V, unless otherwise specified
Normalized Sampling Frequency
vs Supply Voltage and Temperature
SUPPLY VOLTAGE, V
+
(V)
0
(f
S
/f
S
AT 5V, 25°C)
NORMALIZED SAMPLING FREQUENCY
1.4
1.8
16
LTC1040 • TPC02
1.0
0.6
4
8
12
2
6
10
14
2.2
1.2
1.6
0.8
2.0
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
R = 1M
C = 0.1µF
Input Resistance
vs Sampling Frequency
SAMPLING FREQUENCY, f
S
(Hz)
1
10
7
AVERAGE INPUT RESISTANCE, R
IN
(1/f
S
• 33pF) (Ω)
10
9
10
11
10
2
10
4
10
3
10
LTC1040 • TPC05
10
8
10
10
Sampling Rate vs R
EXT
, C
EXT
R
EXT
(Ω)
100k
0.1
1
10
10
2
SAMPLE RATE, f
S
(Hz)
10
3
1M 10M
LT1040 • TPC03
C
EXT
= 1000pF
C
EXT
= 0.01µF
C
EXT
= 0.1µF
C
EXT
= 1µF
C
EXT
= 0.05µF
Response Time
vs Supply Voltage
SUPPLY VOLTAGE, V
+
(V)
2
RESPONSE TIME, t
D
(µs)
200
250
300
812
LTL1040 • TPC04
150
100
46
10 14 16
50
0
T
A
= 25°C
V
P-P
Output Voltage
vs Load Current
LOAD CURRENT, I
L
(mA)
0
TYPICAL OUTPUT VOLTAGE DROP, V
+
–V
P-P
(V)
0.8
0.4
0
8
LTC1040 • TPC06
1.2
1.6
2.0
0.6
0.2
1.0
1.4
1.8
21
43
67 9
5
10
V
+
= 2.8V
V
+
= 16V
V
+
= 5V
V
+
= 10V