LT1222 Datasheet by Analog Devices Inc.

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L7 I [N2 LT1222 ECHNOLOGY WW _I V/r L7 L7HIJMW
1
LT1222
1222fc
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
500MHz, 3nV/Hz, AV 10
Operational Amplifier
Gain-Bandwidth: 500MHz
Gain of 10 Stable Uncompensated
Slew Rate: 200V/μs
Input Noise Voltage: 3nV/Hz
C-Load
TM
Op Amp Drives Capacitive Loads
External Compensation Pin
Maximum Input Offset Voltage: 300μV
Maximum Input Bias Current: 300nA
Maximum Input Offset Current: 300nA
Minimum Output Swing Into 500Ω: ±12V
Minimum DC Gain: 100V/mV, R
L
= 500Ω
Settling Time to 0.1%: 75ns, 10V Step
Settling Time to 0.01%: 120ns, 10V Step
Differential Gain: 0.4%, A
V
= 2, R
L
= 150Ω
Differential Phase: 0.1°, A
V
= 2, R
L
= 150Ω
The LT
®
1222 is a low noise, very high speed operational
amplifier with superior DC performance. The LT1222 is
stable in a noise gain of 10 or greater without compensa-
tion, or the part can be externally compensated for lower
closed-loop gain at the expense of lower bandwidth and
slew rate. It features reduced input offset voltage, lower
input bias currents, lower noise and higher DC gain than
devices with comparable bandwidth and slew rate. The
circuit is a single gain stage that includes proprietary DC
gain enhancement circuitry to obtain precision with high
speed. The high gain and fast settling time make the circuit
an ideal choice for data acquisition systems. The circuit is
also capable of driving capacitive loads which makes it
useful in buffer or cable driver applications. The compen-
sation node can also be used to clamp the output swing.
The LT1222 is a member of a family of fast, high perfor-
mance amplifiers that employ Linear Technology
Corporation’s advanced complementary bipolar process-
ing. For unity-gain stable applications the LT1220 can be
used, and for gains of 4 or greater the LT1221 can be used.
Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
8-, 10-, 12-Bit Data Acquisition Systems
AV = 10 with Output Clamping AV = –1, CC = 30pF Pulse Response
LT1222 • TA02
R
F
= R
G
= 1k
V
S
= ±15V
LT1222 • TA01
V
IN
LT1222
1N5711 1N5711
V
OUT
⎥ ≤ 0.5V
909Ω
100Ω
+
1N4148 0.1μF
5
6
3
2
3k
15V
V
IN
= 100mV
f = 5MHz
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
flflflfl UUUU Consun LTC Marketing for pans speemed wnh mder uperatmg temperature ranges, ELECTRICHL (HflflflCTEflISTICS 2 L7LJUEAB
2
LT1222
1222fc
ELECTRICAL CHARACTERISTICS
A
U
G
W
A
W
U
W
ARBSOLUTEXI T
IS
Total Supply Voltage (V
+
to V
) ............................. 36V
Differential Input Voltage ........................................ ±6V
Input Voltage .......................................................... ±V
S
Output Short-Circuit Duration (Note 2) ........... Indefinite
Specified Temperature Range
LT1222C (Note 3) ................................... 0°C to 70°C
LT1222I ...............................................40°C to 85°C
LT1222M (OBSOLETE) ............... –55°C to 125°C
Operating Temperature Range
LT1222C ........................................... 40°C TO 85°C
LT1222I ...............................................40°C to 85°C
LT1222M (OBSOLETE) ............... –55°C to 125°C
Maximum Junction Temperature (See Below)
Plastic Package ............................................... 150°C
Ceramic Package (OBSOLETE) .................. 175°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
WU
U
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LT1222CN8
LT1222CS8
LT1222IS8
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
NULL
–IN
+IN
V
NULL
V
+
V
OUT
COMP
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
J8 PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S)
S8 PART MARKING
1222
1222I
ORDER PART
NUMBER
SPECIAL
ORDER
CONSULT
FACTORY
T
JMAX
= 175°C,
θ
JA
= 150°C/W
TOP VIEW
V
+
NULL
NULL
–IN V
OUT
COMP
+IN
V
8
7
6
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
TA = 25°C, VS = ±15V, VCM = 0V, unless otherwise specified.
(Note 1)
T
JMAX
= 175°C,
θ
JA
= 100°C/W (J)
OBSOLETE PACKAGE
Consider the N8 or S8 Packages for Alternate Source
LT1222MJ8
OBSOLETE PACKAGE
Consider the N8 or S8 Packages for Alternate Source
ORDER PART
NUMBER
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage (Note 4) 100 300 μV
I
OS
Input Offset Current 100 300 nA
I
B
Input Bias Current 100 300 nA
e
n
Input Noise Voltage f = 10kHz 3 nV/Hz
i
n
Input Noise Current f = 10kHz 2 pA/Hz
R
IN
Input Resistance V
CM
= ±12V 20 45 MΩ
Differential 12 kΩ
C
IN
Input Capacitance 2pF
Input Voltage Range (Positive) 12 14 V
Input Voltage Range (Negative) 13 12 V
CMRR Common Mode Rejection Ratio V
CM
= ±12V 100 120 dB
PSRR Power Supply Rejection Ratio V
S
= ±5V to ±15V 98 110 dB
A
VOL
Large-Signal Voltage Gain V
OUT
= ±10V, R
L
= 500Ω100 200 V/mV
V
OUT
Output Swing R
L
= 500Ω12 13 ±V
I
OUT
Output Current V
OUT
= ±12V 24 26 mA
SR Slew Rate (Note 5) 150 200 V/μs
Full Power Bandwidth 10V Peak (Note 6) 3.2 MHz
GBW Gain-Bandwidth f = 1MHz 500 MHz
L7LJT1EN2
3
LT1222
1222fc
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
r
, t
f
Rise Time, Fall Time A
V
= 10, 10% to 90%, 0.1V 2.4 ns
Overshoot A
V
= 10, 0.1V 43 %
Propagation Delay A
V
= 10, 50% V
IN
to 50% V
OUT
, 0.1V 5.2 ns
t
s
Settling Time 10V Step, 0.1% 75 ns
10V Step, 0.01% 120 ns
Differential Gain A
V
= 2, C
C
= 50pF, f = 3.58MHz, R
L
= 150Ω (Note 7) 0.40 %
A
V
= 10, C
C
= 0pF, f = 3.58MHz, R
L
= 1k (Note 7) 0.15 %
Differential Phase A
V
= 2, C
C
= 50pF, f = 3.58MHz, R
L
= 150Ω (Note 7) 0.10 DEG
A
V
= 10, C
C
= 0pF, f = 3.58MHz, R
L
= 1k (Note 7) 0.01 DEG
R
O
Output Resistance A
V
= 10, f = 1MHz 0.1 Ω
I
S
Supply Current 8 10.5 mA
ELECTRICAL CHARACTERISTICS
VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage (Note 4) 100 600 μV
Input V
OS
Drift 5μV/°C
I
OS
Input Offset Current 100 400 nA
I
B
Input Bias Current 100 400 nA
CMRR Common Mode Rejection Ratio V
CM
= ±12V 100 120 dB
PSRR Power Supply Rejection Ratio V
S
= ±5V to ±15V 98 110 dB
A
VOL
Large-Signal Voltage Gain V
OUT
= ±10V, R
L
= 500Ω100 200 V/mV
V
OUT
Output Swing R
L
= 500Ω12 13 ±V
I
OUT
Output Current V
OUT
= ±12V 24 26 mA
SR Slew Rate (Note 5) 150 200 V/μs
I
S
Supply Current 811 mA
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage (Note 4) 100 600 μV
Input V
OS
Drift 5μV/°C
I
OS
Input Offset Current 100 800 nA
I
B
Input Bias Current 100 1000 nA
CMRR Common Mode Rejection Ratio V
CM
= ±12V 98 120 dB
PSRR Power Supply Rejection Ratio V
S
= ±5V to ±15V 98 110 dB
A
VOL
Large-Signal Voltage Gain V
OUT
= ±10V, R
L
= 500Ω50 200 V/mV
V
OUT
Output Swing R
L
= 500Ω10 13 ±V
R
L
= 1k 12 13 ±V
I
OUT
Output Current V
OUT
= ±10V 20 26 mA
V
OUT
= ±12V 12 13 mA
SR Slew Rate (Note 5) 110 200 V/μs
I
S
Supply Current 811 mA
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: A heat sink may be required when the output is shorted indefinitely.
Note 3: The LT1222C is guaranteed to meet specified performance from 0°C
to 70°C and is designed, characterized and expected to meet these extended
temperature limits, but is not tested at –40°C and 85°C. The LT1222I is
guaranteed to meet the extended temperature limits.
Note 4: Input offset voltage is pulse tested and is exclusive of warm-up drift.
Note 5: Slew rate is measured between ±10V on an output swing of ±12V.
Note 6: FPBW = SR/2πV
P
.
Note 7: Differential Gain and Phase are tested with five amps in series.
Attenuators of 1/Gain are used as loads.
The denotes the specifications which apply over the temperature range 0°C TA 70°C, otherwise specifications are at TA = 25°C.
VS = ±15V, VCM = 0V, unless otherwise specified.
The denotes the specifications which apply over the temperature range –55°C TA 125°C for LT1222M, –40°C TA 85°C for
LT1222I, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, unless otherwise specified.
OUTPUT VOLTAOE swws (Vp RT MAOMTUOE OE INPUT VOLTAGE (VT OUTPUT SHORTAOIROUIT CURRENT (mA) 20 TT TA = zeac‘ AV :05 V DS ‘" ‘0 T5 2 T = TZET / E +VOM ; e E m g 8 T: 25 C (.7 ”/ ’VCM 3 5i 7 5 a 6 55m / D 5 U 5 in V5 20 U 5 ‘0 I5 20 SUPPLV VOLTAGE (:V) SUPPLY VOLTAGE [:V] Output Voltage Swing Input Bias Current Open-Luau Gain vs Resistive Load vs Input Common Marie Voltage vs Re ve Lnad 3O sun Tzu TA: 25% AVUS = saw 400 25 A son TTO ,. q / 5 200 g V5=ii5V 2O SUPPUES g E E “10 5 WU ‘5 a “ é / £400 g ‘0 ,7 w E7200 % 5 ‘7300 my :SV SUPPUES HHHH \ 7m a 7m m Tuu Tk Ink 7‘5 40 ,5 u 5 TO T5 Tu TOO Tk Tu LOAO RESISTANCE TOT TNPUT COMMON MODE VOLTAGE (V) LOAO RESTSTANCE TOT Output Short-Circuit Current Power Supply Rejectinn Ralin vs Temperature Input Nuise Spectral Den y vs Frequency 50 T V000 H70 ‘20 T v5: :5V 5 — 45 L5 g 3 Tue 7 \ g E g 0? 40 $ WU W E E 80 \ a g 5 RR 35 E 2 fi 60 :5 m \ :j 3 3 30 g To T g k 40 5 E a 2 51 E 25 2,, v E 20 20 i (H 0 fan 725 u 25 5O 75 um T25 TO TOO Tk Tflk TOOK TOO Tk Tflflk TOM TOO TEMPERATURE (”0) EREOUENOV (Hz) EREOUENOV (Hz) T222 L7LJUN§QB
4
LT1222
1222fc
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Input Common Mode Range
vs Supply Voltage
Output Voltage Swing
vs Resistive Load
Output Short-Circuit Current
vs Temperature
Power Supply Rejection Ratio
vs Frequency
Open-Loop Gain
vs Resistive Load
Output Voltage Swing
vs Supply Voltage
Supply Current vs Supply Voltage
and Temperature
Input Bias Current
vs Input Common Mode Voltage
Input Noise Spectral Density
SUPPLY VOLTAGE (±V)
0
0
MAGNITUDE OF INPUT VOLTAGE (V)
5
10
15
20
5101520
LT1222 • TPC01
T
A
= 25°C
ΔV
OS
= 0.5mV
+V
CM
–V
CM
SUPPLY VOLTAGE (±V)
0
5
SUPPLY CURRENT (mA)
6
7
8
9
10
11
5101520
LT1222 • TPC02
T = 125°C
T = 25°C
T = –55°C
0
0
MAGNITUDE OF OUTPUT VOLATGE (V)
5
10
15
20
5101520
LT1222 • TPC03
+V
SW
–V
SW
SUPPLY VOLTAGE (±V)
T
A
= 25°C
R
L
= 500Ω
ΔV
OS
= 30mV
LOAD RESISTANCE (Ω)
10
0
OUTPUT VOLTAGE SWING (VP-P)
10
20
25
30
100 1k 10k
LT1222 • TPC04
5
15
±5V SUPPLIES
±15V SUPPLIES
TA = 25°C
ΔVOS = 30mV
INPUT COMMON MODE VOLTAGE (V)
–15
500
INPUT BIAS CURRENT (nA)
0
500
05 15
LT1222 • TPC05
–10 5 10
400
300
200
100
100
200
300
400
IB+
IB
VS = ±15V
TA = 25°C
LOAD RESISTANCE (Ω)
10
70
OPEN-LOOP GAIN (dB)
80
100
110
120
100 1k 10k
LT1222 • TPC06
90
V
S
= ±5V
V
S
= ±15V
T
A
= 25°C
TEMPERATURE (°C)
–50
20
OUTPUT SHORT-CIRCUIT CURRENT (mA)
30
35
45
50
25 50 100 125
LT1222 • TPC07
25
40
025 75
VS = ±5V
FREQUENCY (Hz)
INPUT VOLTAGE NOISE (nV/Hz)
100
10
1000
10 1k 10k 100k
LT1222 • TPC08
1
100
INPUT CURRENT NOISE (pA/Hz)
10
1
100
0.1
VS = ±15V
TA = 25°C
AV = 101
RS = 100k
en
in
FREQUENCY (Hz)
100
0
POWER SUPPLY REJECTION RATIO (dB)
20
40
60
80
100
120
1k 100k 10M 100M
LT1222 • TPC09
10k 1M
V
S
= ±15V
T
A
= 25°C
PSRR
+PSRR
120 r 3 Vs Ema TA 7 p c: I E 80 6 fi an I é a a 5 a \ E 20 8 n w m max IM mM mom 0 25 5a 75 mo ‘25 n 25 50 75 mm 12 mmueuevmzr SETTLING'HMELHS) snmnewsms) anlage Gain and Phase Frequenc Response EIused-Lnnp flutpul Impedance vs Frequency vs Frequency I20 ‘00 I0 v5=gr5v ma an v5=gr5v A V 5) 1, is: a . i=1 5" v5=25v 5” 50 § § g E \\ g g g 3 an 40 g 3 K or w e s 2 E \\ E a 5 g 40 v 20 a E g ' g 000! 2" ° DDpF 75:2570 n 720 com me w m wok m1 mM mum Wk max mm mm we mmueuev (Hz) mmumcv (MHz) FREUUENCV (Hz) Tntal Harmonie Disturtinn Gain-Bandwidth vs Temperalure Slew Rate vs Temperature vs FrEIIHEnEy 55m 275 ‘ ‘ ‘ um v5=u5v KWIEV E V 7 D -525 _\ 25" ec=u g E \ SR (sn'msr) / 3 §5nn @225 ‘f / g I \ _ 5 E E D E 475 5 m E new 35 E 3 z_‘ 45D a ‘75 g 5 E I 425 ‘55 E :5 mm ‘25 Eunnm 750 725 u 25 5a 75 we r25 750 725 n 25 5o 75 mm ‘25 ‘0 ‘00 Ik Wk ‘00 TEMPERATURE (”er TEMPERATURE (no) menumcv (Hz) ‘222 L7 LJHW 5
5
LT1222
1222fc
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Common Mode Rejection Ratio
vs Frequency
Voltage Gain and Phase
vs Frequency
Total Harmonic Distortion
vs Frequency
Slew Rate vs Temperature
Closed-Loop Output Impedance
vs Frequency
Output Swing and Error
vs Settling Time (Inverting)
Output Swing and Error
vs Settling Time (Noninverting)
Gain-Bandwidth vs Temperature
Frequency Response
vs Capacitive Load
FREQUENCY (Hz)
1k
0
COMMON MODE REJECTION RATIO (dB)
20
40
60
80
100
120
100k 10M 100M
LT1222 • TPC10
10k 1M
VS = ±15V
TA = 25°C
SETTLING TIME (ns)
0
OUTPUT SWING (V)
2
6
10
100
LT1222 • TPC11
–2
–6
0
4
8
–4
–8
–10 25 50 75 125
10mV
10mV
1mV
1mV
V
S
= ±15V
T
A
= 25°C
SETTLING TIME (ns)
0
OUTPUT SWING (V)
2
6
10
100
LT1222 • TPC12
–2
–6
0
4
8
–4
–8
–10 25 50 75 125
10mV
10mV
1mV
1mV
V
S
= ±15V
T
A
= 25°C
40
80
120
100
FREQUENCY (Hz)
100
0
VOLTAGE GAIN (dB)
60
10k 1M 100M
LT1222 • TPC13
1k 100k
VS = ±15V
20
10M
20
60
100
80
–20
PHASE MARGIN (DEG)
40
0
VS = ±5V
VS = ±15V
VS = ±5V
TA = 25°C
16
24
30
28
FREQUENCY (MHz)
1
10
VOLTAGE MAGNITUDE (dB)
20
100
LT1222 • TPC14
10
14
12
18
22
26
C = 1000pF
C = 100pF
C = 0
VS = ±15V
TA = 25°C
AV = –10
C = 50pF
C = 500pF
FREQUENCY (Hz)
0.01
OUTPUT IMPEDANCE (Ω)
0.1
1
10
10k 1M 10M 100M
LT1222 • TPC15
0.001
100k
V
S
= ±15V
T
A
= 25°C
A
V
= 10
550
TEMPERATURE (°C)
–50
400
GAIN-BANDWIDTH (MHz)
125
LT1222 • TPC16
0
425
475
525
–25 75
V
S
= ±15V
500
450
25 50 100
275
TEMPERATURE (°C)
–50
125
SLEW RATE (V/μs)
125
LT1222 • TPC17
0
150
200
250
–25 75
225
175
25 50 100
V
S
= ±15V
A
V
= –10
C
C
= 0
SR = (SR
+
) + (SR
)
2
FREQUENCY (Hz)
10 100
0.0001
TOTAL HARMONIC DISTORTION AND NOISE (%)
0.001
0.01
1k 10k 100k
LT1222 • TPC18
V
S
= ±15V
V
O
= 3V
RMS
R
L
= 500Ω
A
V
= ±10
”H?! TM L7LJ£JEN2
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LT1222
1222fc
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Large Signal, AV = 10Small Signal, AV = 10
R
F
= 909Ω
R
G
= 100Ω
LT1222 • TPC19 LT1222 • TPC20
Large Signal, AV = 10,
CL = 10,000pF
LT1222 • TPC21
Small Signal, AV = –10
LT1222 • TPC22 LT1222 • TPC23 LT1222 • TPC24
Large Signal, AV = –10
Small Signal, AV = – 10,
CL = 1,000pF
R
F
= 909Ω
R
G
= 100Ω
R
F
= 1k
R
G
= 100Ω (75)
R
F
= 1k
R
G
= 100Ω (75)
V
S
= ±15V
V
IN
= 20mV
f = 5MHz
V
S
= ±15V
V
IN
= 20mV
f = 5MHz V
S
= ±15V
V
IN
= 2V
f = 2MHz
V
S
= ±15V
V
IN
= 2V
f = 2MHz
APPLICATIONS INFORMATION
WUUU
The LT1222 is stable in noise gains of 10 or greater and
may be inserted directly into HA2520/2/5, HA2541/2/4,
AD817, AD847, EL2020, EL2044 and LM6361 applica-
tions, provided that the nulling circuitry is removed and
the amplifier configuration has a high enough noise gain.
The suggested nulling circuit for the LT1222 is shown in
the following figure.
Layout and Passive Components
The LT1222 amplifier is easy to apply and tolerant of less
than ideal layouts. For maximum performance (for ex-
ample, fast settling time) use a ground plane, short lead
lengths and RF-quality bypass capacitors (0.01μF to 0.1μF).
For high drive current applications use low ESR bypass
capacitors (1μF to 10μF tantalum). Sockets should be
avoided when maximum frequency performance is re-
quired. For more details see Design Note 50. Feedback
resistors greater than 5k are not recommended because a
pole is formed with the input capacitance which can cause
peaking or oscillations. Stray capacitance on Pin 5 should
be minimized. Bias current cancellation circuitry is em-
ployed on the inputs of the LT1222 so the input bias current
and input offset current have identical specifications. For
this reason, matching the impedance on the inputs to
reduce bias current errors is not necessary.
Offset Nulling
LT1222 • AI01
V+
V
0.1μF
0.1μF
5k
3
24
76
8
1
LT1222
+
R
F
= 909Ω
R
G
= 100Ω
V
S
= ±15V
V
IN
= 2V
f = 20kHz
R
F
= 1k
R
G
= 100Ω (75)
V
S
= ±15V
V
IN
= 15mV
f = 500kHz
L7LJT1EN2
7
LT1222
1222fc
APPLICATIONS INFORMATION
WUUU
Output Clamping
Access to the internal compensation node at Pin 5 allows
the output swing of the LT1222 to be clamped. An example
is shown on the first page of this data sheet. The compen-
sation node is approximately one diode drop above the
output and can source or sink 1.2mA. Back-to-back Schot-
tky diodes clamp Pin 5 to a diode drop above ground so the
output is clamped to ±0.5V (the drop of the Schottkys at
1.2mA). The diode reference is bypassed for good AC
response. This circuit is useful for amplifying the voltage at
false sum nodes used in settling time measurements.
Capacitive Loading
The LT1222 is stable with capacitive loads. This is accom-
plished by sensing the load induced output pole and adding
compensation at the amplifier gain node. As the capacitive
load increases, both the bandwidth and phase margin
decrease. There will be peaking in the frequency domain as
shown in the curve of Frequency Response vs Capacitive
Load. The small-signal transient response will have more
overshoot as shown in the photo of the small-signal
response with 1000pF load. The large-signal response with
a 10,000pF load shows the output slew rate being limited
to 4V/μs by the short-circuit current. The LT1222 can drive
coaxial cable directly, but for best pulse fidelity a resistor of
value equal to the characteristic impedance of the cable
(i.e., 75Ω) should be placed in series with the output. The
other end of the cable should be terminated with the same
value resistor to ground.
Compensation
The LT1222 has a typical gain-bandwidth product of
500MHz which allows it to have wide bandwidth in high
gain configurations (i.e., in a gain of 100, it will have a
bandwidth of about 5MHz). For added flexibility the ampli-
fier frequency response may be adjusted by adding capaci-
tance from Pin 5 to ground. The compensation capacitor
may be used to reduce overshoot, to allow the amplifier to
be used in lower noise gains, or simply to reduce band-
width. Table 1 shows gain and compensation capacitor
vresus –3dB bandwidth, maximum frequency peaking and
small-signal overshoot.
Table 1
A
V
C
C
(pF) f
3dB
(MHz) Max Peaking (dB) Overshoot (%)
– 1 30 99 4.2 36
– 1 50 70 0.9 13
– 1 82 32 0 0
– 1 150 13 0 0
5 10 140 3.8 35
5 20 100 0 5
530 34 0 1
550 15 0 0
10 0 150 9.5 45
10 5 111 0.2 10
10 10 40 0 2
10 20 17 0 0
20 0 82 0.1 10
20 5 24 0 0
20 10 14 0 0
For frequencies < 10MHz the frequency response of the
amplifier is approximately:
f = 1/[2π • 53Ω • (C
C
+ 6pF) • (Noise Gain)]
The slew rate is affected as follows:
SR = 1.2mA /(C
C
+ 6pF)
An example would be a gain of –10 (noise gain of 11) and
C
C
= 20pF which has 10.5MHz bandwidth and 46V/μs slew
rate. It should be noted that the LT1222 is not stable in
A
V
= 1 unless C
C
= 50pF and a 1k resistor is used as the
feedback resistor. The 1k and input capacitance increase
the noise gain at frequency to aid stability.
L7LJUN§QB
8
LT1222
1222fc
TYPICAL APPLICATIONS N
U
VOS Null Loop
LT1222 • TA03
IN
V
100pF
LT1222
10k
100pF
+
LT1097
+
10k
VOUT
AV = 1001
25k
25Ω
150k
1
8
150k
Two Op Amp Instrumemtation Amplifier
+
+
LT1220
GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON MODE REJECTION
BW = 3MHz
V
IN
V
OUT
+
LT1222
LT1222 • TA04
R3
1k
R5
220Ω
R4
10k
R2
1k
R1
10k
SI PLIFIED SCHE ATIC
WW
6 OUT
LT1222 • SS
BIAS 2
COMP
BIAS 1
18
5
NULL
–IN
+IN 3
V
7V
+
2
4
j 41 AR7 5%: U ED .18 Package fl-Lead EERDIP (Narrnw .300 Inch, Hermelic) (Relerence LTC DWG 1‘ 0570871110) coma LEADS upmu n 405 mm was no 2371 W271» MIN 002 ms ’a (0533mm mum DPYION ms 022047310 unasrnnsag‘ 1m 75741 (114371727) m WP mum own" 0 am ass (2 :33) (07525551 " MAX ‘ ‘ 0015410611 «135145241 1 1 000570015 J L 7, (0203704571 n "5 T newness ’ new man D1MENSIONSAPPLV to 5mm mP/Pms (1143716511 % on rm PLAYE LEADS 3175 naminazs MW 1036047550)" 4' i L7L|NEN2
9
LT1222
1222fc
PACKAGE DESCRIPTION
U
H Package
8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
J8 1298
0.014 – 0.026
(0.360 – 0.660)
0.200
(5.080)
MAX
0.015 – 0.060
(0.381 – 1.524)
0.125
3.175
MIN
0.100
(2.54)
BSC
0.300 BSC
(0.762 BSC)
0.008 – 0.018
(0.203 – 0.457) 0° – 15°
0.005
(0.127)
MIN
0.405
(10.287)
MAX
0.220 – 0.310
(5.588 – 7.874)
1234
87
65
0.025
(0.635)
RAD TYP
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
CORNER LEADS OPTION
(4 PLCS)
0.045 – 0.065
(1.143 – 1.651)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
0.050
(1.270)
MAX
0.016 – 0.021**
(0.406 – 0.533)
0.010 – 0.045*
(0.254 – 1.143)
SEATING
PLANE
0.040
(1.016)
MAX 0.165 – 0.185
(4.191 – 4.699)
GAUGE
PLANE
REFERENCE
PLANE
0.500 – 0.750
(12.700 – 19.050)
0.305 – 0.335
(7.747 – 8.509)
0.335 – 0.370
(8.509 – 9.398)
DIA
H8(TO-5) 0.200 PCD 1197
LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS 0.016 – 0.024
(0.406 – 0.610)
*
**
0.200
(5.080)
TYP
0.027 – 0.045
(0.686 – 1.143)
0.028 – 0.034
(0.711 – 0.864)
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
45°TYP PIN 1
OBSOLETE PACKAGES
H m m H \‘J m m w ‘7 3007 325 4. 0457 055 9 ‘ (752073255) ‘ ¢ M 143715st ‘ r" \ \ 055 J ¢ 0 em if mm, M 7 ¢, NP 7 (nzuaiuaau 7 7 f ass ,7 7 \ E9 m [8255:33? i g (0457 L7LJUN§QB
10
LT1222
1222fc
PACKAGE DESCRIPTION
U
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
N8 1002
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.120
(3.048)
MIN
12 34
87 65
.255 ± .015*
(6.477 ± 0.381)
.400*
(10.160)
MAX
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
0.381
8.255
()
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
V A Ix; ‘501005 153 57 iv 53%
11
LT1222
1222fc
PACKAGE DESCRIPTION
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
L7LJUN§QB
12
LT1222
1222fc
© LINEAR TECHNOLOGY CORPORATION 1992
LT 0507 REV C • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
FAX: (408) 434-0507
www.linear.com
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1220 45MHz, 250V/μs Amplifier Unity Gain Stable Version of the LT1222
LT1221 150MHz, 250V/μs Amplifier A
V
4 Version of the LT1222

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