High Voltage FET-Input OPERATIONAL AMPLIFIER
OPA445
APPLICATIONS
● TEST EQUIPMENT
● HIGH VOLTAGE REGULATORS
● POWER AMPLIFIERS
● DATA ACQUISITION
● SIGNAL CONDITIONING
FEATURES
● WIDE POWER SUPPLY RANGE: ± 10V to
± 45V
● HIGH SLEW RATE: 10V/ µ s
● LOW INPUT BIAS CURRENT: 50pA max
● STANDARD-PINOUT TO-99 AND DIP PACKAGES
DESCRIPTION
The OPA445 is a monolithic operational amplifier capable of operation from power supplies up to ± 45V and output currents of 15mA. It is useful in a wide variety of applications requiring high output voltage or large common-mode voltage swings.
The OPA445’s high slew rate provides wide power- bandwidth response, which is often required for high voltage applications. FET input circuitry allows the
use of high impedance feedback networks, thus mini- mizing their output loading effects. Laser trimming of the input circuitry yields low input offset voltage and drift.
The OPA445 is unity-gain stable and requires no external compensation components. It is available in both industrial (–25°C to +85°C) and military (–55°C to +125°C) temperature ranges.
+In (3) –In
(2)
Trim (1)
Trim (5)
–VS (4) Out (6) +VS (7)
®
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706 Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
SPECIFICATIONS
ELECTRICAL
At VS = ±40°C and TA = +25°C, unless otherwise specified.
OPA445SM OPA445BM OPA445AP
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE
Input Offset Voltage VCM = 0V 0.5 1.0 1.0 3.0 2.0 5.0 mV
Average Drift TA = TMIN to TMAX * 10 15 µV/°C
Supply Rejection VS = ±10V to ±50V * * 80 110 * * dB
BIAS CURRENT
Input Bias Current VCM = 0V * * 20 50 50 100 pA
Over Temperature 100 10 20 nA
OFFSET CURRENT
Input Offset Current VCM = 0V * * 4 10 20 40 pA
Over Temperature 50 5 10 nA
IMPEDANCE
Differential * 1013 || 1 * Ω || pF
Common-Mode * 1014 || 3 * Ω || pF
VOLTAGE RANGE
Common-Mode Input Range * ±35 * V
Common-Mode Rejection VIN = ±30V,
Over Temp. * * 80 95 * * dB
OPEN-LOOP GAIN, DC
Open-Loop Voltage Gain RL =5kΩ * * 100 105 * * dB
Over Temperature * 97 * dB
FREQUENCY RESPONSE
Gain Bandwidth Small Signal * 2 * MHz
Full Power Response 35Vp-p, RL = 5kΩ * * 45 55 * * kHz
DYNAMIC RESPONSE
Slew Rate VO = ±35V,
RL = 5kΩ * * 5 10 * * V/µs
Rise Time VO = ±200mV * 100 * ns
Overshoot AV = +1
ZL = 5kΩ || 50pF * 30 * %
OUTPUT
Voltage Output, Over Temp. RL = 5kΩ * ±35 * V
Current Output VO = ±28V * ±15 * mA
Output Resistance DC, Open Loop * 220 * Ω
Short Circuit Current * ±26 * mA
POWER SUPPLY
Rated Voltage, ±VS * ±40 * V
Voltage Range, ±VS
Derated Performance Over Temperature * * ±10 ±45 * * V
Current, Quiescent IO = 0mA * * 3.8 4.5 * * mA
TEMPERATURE RANGE
Specification –55 +125 –25 +85 * * °C
Operating Ambient Temperature * * –55 +125 –25 +85 °C
θ Junction-Ambient * 200 100 °C/W
*Specifications same as OPA445BM.
CONNECTION DIAGRAMS
8 1
2
7
6
3 5 4 Offset
Trim
Offset Trim
Output +VS NC
–In
+In
–VS
Case is connected to –VS
Top View TO-99
Top View DIP
1 2 3
4 5
6 7 Offset Trim 8
+VS –In
+In –VS
Output Offset Trim NC
TYPICAL PERFORMANCE CURVES
TA = +25°C, VS = ±40VDC, unless otherwise noted.
DICE INFORMATION
PAD FUNCTION
1 Offset Trim
2 –In
3 +In
4 NC
5 –VS
6 Offset Trim
PAD FUNCTION
7 –VS
8 (Compensation)
9 Output
10 +VS
11 NC
12 NC
Substrate Bias: Electrically connected to –VS supply.
NC: No Connection.
MECHANICAL INFORMATION
MILS (0.001") MILLIMETERS Die Size 88 x 72 ±5 2.24 x 1.83 ±0.13
Die Thickness 20 ±3 0.51 ±0.08
Min. Pad Size 4 x 4 0.1 x 0.1
Backing Chromium-Silver
ABSOLUTE MAXIMUM RATINGS
Power Supply ...±50V Internal Power Dissipation ... 680mW Differential Input Voltage ...±80V Input Voltage Range ... |±VS| –3V Storage Temperature Range: M ... –65°C to +150°C P ... –40°C to +85°C Operating Temperature Range: M ... –55°C to +125°C P ... –40°C to +85°C Lead Temperature (soldering, 10s) ... +300°C Output Short-Circuit to Ground (TA = +25°C) ... Continuous Junction Temperature ... +175°C
OPA445 DIE TOPOGRAPHY
ORDERING INFORMATION
MODEL PACKAGE TEMPERATURE RANGE
OPA445AP 8-pin plastic DIP –25°C to +85°C
OPA445BM 8-pin TO-99 –25°C to +85°C
OPA445SM 8-pin TO-99 –55°C to +125°C
PACKAGE INFORMATION
PACKAGE DRAWING
MODEL PACKAGE NUMBER(1)
OPA445AP 8-pin plastic DIP 006
OPA445BM 8-pin TO-99 001
OPA445SM 8-pin TO-99 001
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book.
GBW
–75 –50 –25 0 25 75 100 125
Ambient Temperature (°C) 1.4
2.6
2.4
2.2
2.0
1.8
1.6
Gain Bandwidth (MHz)
GAIN BANDWIDTH AND SLEW RATE vs TEMPERATURE
SR
5 11
10
9
8
7
6
50
Slew Rate (V/µs)
GBW
10 20 30 40 50
Supply Voltage (±VS) 1.6
2.2
2.0
1.8
Gain Bandwidth (MHz)
GAIN BANDWIDTH AND SLEW RATE vs SUPPLY VOLTAGE
Slew Rate (V/µs)
S/R
8 14
12
10
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C, VS = ±40VDC, unless otherwise noted.
–75 –50 –25 0 25 75 100 125
Temperature (°C) 0.01pA
100nA
10nA
1nA
100pA
10pA
1pA
0.1pA
Input Bias Current
INPUT BIAS CURRENT vs TEMPERATURE
50 10 100 1k 10k 1M 10M 100M
Frequency (Hz) 0
Power Supply Rejection (dB)
POWER SUPPLY REJECTION vs FREQUENCY
100k 120
100
80
60
40
20
–VCC +VCC
10 100 1k 10k 1M 10M
Frequency (Hz) 0
140
120
100
80
60
40
20
Voltage Gain (dB)
OPEN-LOOP FREQUENCY RESPONSE
100k Gain
θ
–185 –45
–90
–135 Phase (Degrees)
10 20 30 40 50
Supply Voltage (±VS) 90
120
110
Voltage Gain (dB) 100
OPEN-LOOP GAIN AND SUPPLY CURRENT vs SUPPLY VOLTAGE
Supply Current (mA)
AVOL
2.5 4.0
3.5
3.0 IQ
10 12 14 16 18 22 24 26
IOUT (mA) 18
24
23
22
21
20
19 VOUT (V)
OUTPUT VOLTAGE vs OUTPUT CURRENT (VSUPPLIES = ±24V)
20
Current Limit
–75 –50 –25 0 25 75 100 125
Ambient Temperature (°C) SUPPLY CURRENT vs TEMPERATURE
50 2
5
4
3
Supply Current (mA)
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C, VS = ±15VDC unless otherwise noted.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
–75 –50 –25 0 25 75 100 125
Ambient Temperature (°C) 90
120
110
Voltage Gain (dB) 100
OPEN-LOOP GAIN vs TEMPERATURE
50
MAXIMUM OUTPUT VOLTAGE SWING vs FREQUENCY
100k Frequency (Hz)
1k 10k 1M
90 80 70 60 50 40 30 20 10
Output Voltage (Vp-p)
0
–50 –25 0 25 75 100 125
Temperature (°C) 0
35
30
25
20
15
10
5
Output Current (mA)
OUTPUT CURRENT vs TEMPERATURE
50
Output Current
VO = ±35V Short-Circuit Current
–50 –25 0 25 75 100 125
Temperature (°C) 0
Dissipation (W)
MAXIMUM POWER DISSIPATION vs TEMPERATURE
50 0.8
0.7 0.6 0.5 0.4 0.3 0.2 0.1
Plastic DIP
TO-99
10 100 1k 100k
Frequency (Hz) 1
100
10
Voltage Noise (nV/ Hz)
10k INPUT VOLTAGE NOISE SPECTRAL DENSITY
INSTALLATION AND
OPERATING INSTRUCTIONS
The OPA445 may be operated from power supplies up to
±45V or a total of 90V. Power supplies should be bypassed with 0.022µF capacitors, or greater, near the power supply pins. Be sure that the capacitors are appropriately rated for the supply voltage used.
The OPA445 can supply output currents of 15mA and larger. This would present no problem for a standard op amp operating from ± 15V supplies. With high supply voltages, however, internal power dissipation of the op amp can be quite large. Operation from a single power supply (or unbal- anced power supplies) can produce even larger power dissi- pation since a larger voltage is impressed across the con- ducting output transistor.
Dissipation should be limited to 680mW at 25 ° C. At tem- peratures above 25 ° C, the maximum dissipation should be derated according to the thermal resistance of the package type used.
OPA445 3 2
6 1
4 5 7
–VS
10mV Typical Trim Range (1)
+VS
NOTE: (1) 10kΩ to 1MΩ Trim Potentiometer (100kΩ recommended).
FIGURE 1. Offset Voltage Trim.
Package thermal resistance, θ
JC, is affected by mounting techniques and environments. The figures provided are typi- cal for common mounting configurations with convection air flow. Poor air circulation and use of sockets can signifi- cantly increase thermal resistance. Best thermal perfor- mance is achieved by soldering the op amp into a circuit board with wide printed circuit traces to allow greater conduction through the op amp leads. Simple clip-on heat sinks can reduce the thermal resistance of the TO-99 metal package by as much as 50°C/W.
A short-circuit to ground will produce a typical output current of 25mA. With ±40V power supplies, this creates an internal power dissipation of 1.0W. This exceeds the maxi- mum rating for the device, and is not recommended. Perma- nent damage is unlikely, however, since the short-circuit output current will diminish as the junction temperature rises.
FIGURE 2. Voltage-to-Current Converter.
OPA445 R1
Compliance Voltage Range = ±35V +40V 100kΩ
R2 10kΩ
R3 100kΩ
R4 9.9kΩ –40V
R2 100Ω
IL Load IL = [(V2 – V1)/R5] (R2/R1)
= (V2 – V1)/1kΩ V2
V1
FIGURE 3. Programmable Voltage Source.
OPA445 0-20mA
+60V
25kΩ
–12V
VO = 0 to +50V at 10mA 0.1µF
0.1µF Protects DAC
During Slewing DAC80-CBI-I
