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LT1631CS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT1630/LT1631
13
16301fa
Typical perForMance characTerisTics
Open-Loop Gain Open-Loop Gain
Open-Loop Gain
Warm-Up Drift vs Time
Maximum Undistorted Output
Signal vs Frequency
Total Harmonic Distortion + Noise
vs Frequency
Capacitive Load Handling Slew Rate vs Supply Voltage
Output Step vs
Settling Time to 0.01%
CAPACITIVE LOAD (pF)
1
OVERSHOOT (%)
10 100 1000
1630/31 G16
60
50
40
30
20
10
0
V
S
= 5V, 0V
A
V
= 1
R
L
= 1k
TOTAL SUPPLY VOLTAGE (V)
0
SLEW RATE (V/µs)
8 12 20 284 16
24
32
1630/31 G17
14
13
12
11
10
9
8
RISING EDGE
FALLING EDGE
V
OUT
= 80% OF V
S
A
V
= –1
SETTLING TIME (µs)
0 0.25
–10
OUTPUT STEP (V)
–8
–4
–2
0
10
4
0.50
0.75 1.00
1630/31 G18
–6
6
8
2
1.25
1.50
V
S
= ±15V
NONINVERTING
INVERTING
INVERTING
NONINVERTING
OUTPUT VOLTAGE (V)
–20 –15
INPUT VOLTAGE (µV)
0
10
20
1630/31 G19
–10
–20
–10 –5
0 5
10 15
20
–5
5
–15
15
V
S
= ±15V
R
L
= 1k
R
L
= 10k
OUTPUT VOLTAGE (V)
0
INPUT VOLTAGE (µV)
3
5
1630/31 G20
1 2 4
8
6
4
2
0
–2
–4
–6
–8
6
V
S
= 5V, 0V
R
L
= 1k
R
L
= 10k
OUTPUT VOLTAGE (V)
–5 –4 –3 –2 –1
INPUT VOLTAGE (µV)
200
150
100
50
0
–50
–100
–150
–200
3
1630/31 G21
10 2 4 6
5 7
V
S
= ±15V
R
L
= 100Ω
FREQUENCY (kHz)
THD + NOISE (%)
1
0.1
0.01
0.001
0.0001
0.1 10 100
163031 G23
1
V
IN
= 2V
P-P
R
L
= 10k
V
S
= 3V, 0V
A
V
= 1
V
S
= 5V, 0V
A
V
= 1
V
S
= 5V, 0V AND 3V, 0V
A
V
= –1
FREQUENCY (kHz)
1
OUTPUT VOLTAGE SWING (V
P-P
)
10 100 1000
1630/31 G24
5
4
3
2
1
0
V
S
= 5V, 0V
A
V
= –1
V
S
= 5V, 0V
A
V
= 1
LT1630/LT1631
14
16301fa
Typical perForMance characTerisTics
Harmonic Distortion vs Frequency 5V Small-Signal Response 5V Large-Signal Response
FREQUENCY (kHz)
100
HARMONIC DISTORTION (dBc)
0
–20
–40
–60
–80
–100
1000
1630/31 G30
200 500
3RD
2ND
2ND
3RD
V
S
= 5V, 0V
A
V
= 1
V
IN
= 2V
P-P
R
L
= 150Ω
R
L
= 1k
V
S
= 5V, 0V
A
V
= 1
R
L
= 1k
163031 G26
V
S
= 5V, 0V
A
V
= 1
R
L
= 1k
163031 G27
Harmonic Distortion vs Frequency ±15V Small-Signal Response ±15V Large-Signal Response
FREQUENCY (kHz)
100
HARMONIC DISTORTION (dBc)
0
–20
–40
–60
–80
–100
1000
1630/31 G31
200 500
3RD
2ND
3RD
V
S
= 5V, 0V
A
V
= –1
V
IN
= 2V
P-P
R
L
= 150Ω
R
L
= 1k
2ND
V
S
= ±15V
A
V
= 1
R
L
= 1k
163031 G28
V
S
= ±15V
A
V
= 1
R
L
= 1k
163031 G29
applicaTions inForMaTion
Rail-to-Rail Input and Output
The LT1630/LT1631 are fully functional for an input and
output signal range from the negative supply to the posi-
tive supply. Figure 1 shows a simplified schematic of the
amplifier. The input stage consists of two differential am-
plifiers, a PNP stage Q1/Q2 and an NPN stage Q3/Q4 that
are active over different ranges of input common mode
voltage. The PNP differential input pair is active for input
common mode voltages V
CM
between the negative supply
to approximately 1.4V below the positive supply. As V
CM
moves closer toward the positive supply, the transis-
tor Q5 will steer the tail current I
1
to the current mirror
Q6/Q7, activating the NPN differential pair and the PNP
pair becomes inactive for the rest of the input common
mode range up to the positive supply.
The output is configured with a pair of complementary
common emitter stages Q14/Q15 that enables the output
to swing from rail to rail. These devices are fabricated on
Linear Technology’s proprietary complementary bipolar
process to ensure similar DC and AC characteristics. Ca-
pacitors C1 and C2 form local feedback loops that lower
the output impedance at high frequencies.
LT1630/LT1631
15
16301fa
applicaTions inForMaTion
Q4
Q6
V
BIAS
D6D5
+IN
D2
Q3
Q7
Q1
I
1
I
2
+
+
Q9
Q2
D4
D1
D3
–IN
OUT
V
–
V
+
Q5
Q12
Q8
Q14
1630/31 F01
C1
R1
R6
225Ω
R7
225Ω
R3
V
–
C
C
R4 R5
C2
R2
Q11 Q13
Q15
BUFFER
AND
OUTPUT BIAS
Figure 1. LT1630 Simplified Schematic Diagram
Power Dissipation
The LT1630/LT1631 amplifiers combine high speed and
large output current drive in a small package. Because
the amplifiers operate over a very wide supply range, it
is possible to exceed the maximum junction temperature
of 150°C in plastic packages under certain conditions.
Junction temperature, T
J
, is calculated from the ambient
temperature, T
A
, and power dissipation, P
D
, as follows:
LT1630CN8: T
J
= T
A
+ (P
D
• 130°C/W)
LT1630CS8: T
J
= T
A
+ (P
D
• 190°C/W)
LT1631CS: T
J
= T
A
+ (P
D
• 150°C/W)
The power dissipation in the IC is the function of the
supply voltage, output voltage and load resistance. For
a given supply voltage, the worst-case power dissipation
P
DMAX
occurs at the maximum supply current and when
the output voltage is at half of either supply voltage (or the
maximum swing if less than 1/2 supply voltage). Therefore
P
DMAX
is given by:
P
DMAX
= (V
S
• I
SMAX
) + (V
S
/2)2/R
L
To ensure that the LT1630/LT1631 are used properly,
calculate the worst-case power dissipation, get the ther-
mal resistance for a chosen package and its maximum
junction temperature to derive the maximum ambient
temperature.
Example: An LT1630CS8 operating on ±15V supplies and
driving a 500Ω, the worst-case power dissipation per
amplifier is given by:
P
DMAX
= (30V • 4.75mA) + (15V – 7.5V)(7.5/500)
= 0.143 + 0.113 = 0.256W
If both amplifiers are loaded simultaneously, then the
total power dissipation is 0.512W. The SO-8 package has
a junction-to-ambient thermal resistance of 190°C/W in
still air. Therefore, the maximum ambient temperature that
the part is allowed to operate is:
T
A
= T
J
– (P
DMAX
• 190°C/W)
T
A
= 150°C – (0.512W • 190°C/W) = 53°C
For a higher operating temperature, lower the supply
voltage or use the DIP package part.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT1631CS#TRPBF

Mfr. #:
Buy LT1631CS#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Precision Amplifiers 30MHz, 10V/ s, 4x R2R In & Out Prec Op
Lifecycle:
New from this manufacturer.
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