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® |
OPA128 |
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Difet® Electrometer-Grade
OPERATIONAL AMPLIFIER
FEATURES |
APPLICATIONS |
● ULTRA-LOW BIAS CURRENT: 75fA max |
● ELECTROMETER |
● LOW OFFSET: 500μV max |
● MASS SPECTROMETER |
● LOW DRIFT: 5μV/°C max |
● CHROMATOGRAPH |
● HIGH OPEN-LOOP GAIN: 110dB min |
● ION GAUGE |
● HIGH COMMON-MODE REJECTION: |
● PHOTODETECTOR |
90dB min |
● RADIATION-HARD EQUIPMENT |
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●IMPROVED REPLACEMENT FOR AD515 AND AD549
DESCRIPTION
The OPA128 is an ultra-low bias current monolithic operational amplifier. Using advanced geometry dielectrically-isolated FET (Difet® ) inputs, this monolithic amplifier achieves a performance level exceeding even the best hybrid electrometer amplifiers.
Laser-trimmed thin-film resistors give outstanding voltage offset and drift performance.
A noise-free cascode and low-noise processing give the OPA128 excellent low-level signal handling capabilities. Flicker noise is very low.
The OPA128 is an improved pin-for-pin replacement for the AD515.
Difet® Burr-Brown Corp.
Case (Guard) |
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8 |
7 |
+VCC
–In |
2 |
3 |
+In
Noise-Free
Cascode
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6 |
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Output |
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Trim |
1kΩ |
28kΩ |
28kΩ |
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1 |
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5 |
1kΩ |
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Trim |
2kΩ |
2kΩ |
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4 |
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–VCC |
OPA128 Simplified Circuit
International Airport Industrial Park • Mailing Address: PO Box 11400 |
• Tucson, AZ 85734 |
• Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706 |
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Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP |
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Telex: 066-6491 • |
FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 |
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© 1986 Burr-Brown Corporation |
PDS-653E |
Printed in U.S.A. May, 1995 |
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SPECIFICATIONS
ELECTRICAL
At VCC = ±15VDC and TA = +25°C unless otherwise noted. Pin 8 connected to ground.
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OPA128JM |
OPA128KM |
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OPA128LM |
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OPA128SM |
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PARAMETER |
CONDITIONS |
MIN |
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TYP |
MAX |
MIN |
TYP |
MAX |
MIN |
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TYP |
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MIN |
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TYP |
MAX |
UNITS |
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INPUT |
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BIAS CURRENT(1) |
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Input Bias Current |
VCM = 0VDC, |
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RL ³ 10kW |
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±150 |
±300 |
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±75 |
±150 |
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±40 |
±75 |
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±75 |
±150 |
fA |
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OFFSET CURRENT(1) |
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Input Offset Current |
VCM = 0VDC, |
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RL ³ 10kW |
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65 |
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30 |
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30 |
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30 |
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fA |
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OFFSET VOLTAGE(1) |
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Input Offset Voltage |
VCM = 0VDC |
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±260 |
±1000 |
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±140 |
±500 |
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±140 |
±500 |
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±140 |
±500 |
mV |
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Average Drift |
TA = TMIN to TMAX |
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±20 |
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±10 |
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±5 |
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±10 |
mV/°C |
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Supply Rejection |
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80 |
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120 |
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90 |
120 |
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90 |
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120 |
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90 |
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120 |
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dB |
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±1 |
±100 |
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±1 |
±32 |
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±1 |
±32 |
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±1 |
±32 |
mV/V |
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NOISE |
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Voltage: fO = 10Hz |
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92 |
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92 |
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92 |
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92 |
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nV/Ö |
Hz |
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fO = 100Hz |
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78 |
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78 |
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78 |
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78 |
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nV/Ö |
Hz |
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fO = 1kHz |
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27 |
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27 |
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27 |
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27 |
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nV/Ö |
Hz |
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fO = 10kHz |
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15 |
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15 |
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15 |
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15 |
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nV/Ö |
Hz |
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fB = 10Hz to 10kHz |
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2.4 |
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2.4 |
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2.4 |
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2.4 |
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mVrms |
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fB = 0.1Hz to 10Hz |
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4 |
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4 |
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4 |
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4 |
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mVp-p |
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Current: fB = 0.1Hz to 10Hz |
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4.2 |
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3 |
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2.3 |
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3 |
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fA, p-p |
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fO = 0.1Hz to 20kHz |
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0.22 |
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0.16 |
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0.12 |
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0.16 |
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fA/Ö |
Hz |
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IMPEDANCE |
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Differential |
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1013 || 1 |
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1013 || 1 |
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1013|| 1 |
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1013 || 1 |
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W || pF |
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Common-Mode |
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1015 || 2 |
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1015 || 2 |
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1015 || 2 |
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1015 || 2 |
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W || pF |
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VOLTAGE RANGE(4) |
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Common-Mode Input Range |
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±10 |
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±12 |
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±10 |
±12 |
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±10 |
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±12 |
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±10 |
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±12 |
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V |
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Common-Mode Rejection |
VIN = ±10VDC |
80 |
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118 |
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90 |
118 |
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90 |
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118 |
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90 |
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118 |
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dB |
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OPEN-LOOP GAIN, DC |
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Open-Loop Voltage Gain |
RL ³ 2kW |
94 |
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128 |
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110 |
128 |
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110 |
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128 |
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110 |
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128 |
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dB |
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FREQUENCY RESPONSE |
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Unity Gain, Small Signal |
(2) |
0.5 |
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1 |
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0.5 |
1 |
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0.5 |
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1 |
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0.5 |
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1 |
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MHz |
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Full Power Response |
20Vp-p, RL = 2kW |
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47 |
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47 |
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47 |
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47 |
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kHz |
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Slew Rate |
VO = ±10V, RL =2kW |
0.5 |
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3 |
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1 |
3 |
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1 |
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3 |
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1 |
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3 |
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V/ms |
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Settling Time, 0.1% |
Gain = –1, RL = 2kW |
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5 |
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5 |
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5 |
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5 |
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ms |
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0.01% |
10V Step |
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10 |
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10 |
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10 |
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10 |
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ms |
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Overload Recovery, |
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50% Overdrive(3) |
Gain = –1 |
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5 |
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5 |
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5 |
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5 |
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ms |
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RATED OUTPUT |
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Voltage Output |
RL = 2kW |
±10 |
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±13 |
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±10 |
±13 |
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±10 |
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±13 |
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±10 |
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±13 |
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V |
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Current Output |
VO = ±10VDC |
±5 |
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±10 |
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±5 |
±10 |
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±5 |
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±10 |
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±5 |
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±10 |
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mA |
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Output Resistance |
DC, Open Loop |
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100 |
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100 |
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100 |
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100 |
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W |
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Load Capacitance Stability |
Gain = +1 |
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1000 |
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1000 |
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1000 |
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1000 |
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pF |
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Short Circuit Current |
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10 |
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34 |
55 |
10 |
34 |
55 |
10 |
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34 |
55 |
10 |
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34 |
55 |
mA |
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POWER SUPPLY |
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Rated Voltage |
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±15 |
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±15 |
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±15 |
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±15 |
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VDC |
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Voltage Range, |
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Derated Performance |
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±5 |
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±18 |
±5 |
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±18 |
±5 |
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±18 |
±5 |
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±18 |
VDC |
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Current, Quiescent |
IO = 0mADC |
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0.9 |
1.5 |
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0.9 |
1.5 |
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0.9 |
1.5 |
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0.9 |
1.5 |
mA |
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TEMPERATURE RANGE |
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Specification |
Ambient Temp. |
0 |
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+70 |
0 |
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+70 |
0 |
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+70 |
–55 |
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+125 |
°C |
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Operating |
Ambient Temp. |
–55 |
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+125 |
–55 |
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+125 |
–55 |
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+125 |
–55 |
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+125 |
°C |
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Storage |
Ambient Temp. |
–65 |
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+150 |
–65 |
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+150 |
–65 |
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+150 |
–65 |
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+150 |
°C |
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θ Junction-Ambient |
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200 |
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200 |
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200 |
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200 |
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°C/W |
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NOTES: (1) Offset voltage, offset current, and bias current are measured with the units fully warmed up. Bias current doubles approximately every 11°C. (2) Sample tested. (3) Overload recovery is defined as the time required for the output to return from saturation to linear operation following the removal of a 50% input overdrive.
(4) If it is possible for the input voltage to exceed the supply voltage, a series protection resistor should be added to limit input current to 0.5mA. The input devices can withstand overload currents of 0.3mA indefinitely without damage.
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.
®
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OPA128 |
2 |
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ELECTRICAL (FULL TEMPERATURE RANGE SPECIFICATIONS)
At VCC = ±15VDC and TA = TMIN and TMAX unless otherwise noted.
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OPA128JM |
OPA128KM |
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OPA128LM |
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OPA128SM |
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PARAMETER |
CONDITIONS |
MIN |
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TYP |
MAX |
MIN |
TYP |
MAX |
MIN |
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TYP |
MAX |
MIN |
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TYP |
MAX |
UNITS |
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TEMPERATURE RANGE |
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Specification Range |
Ambient Temp. |
0 |
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+70 |
0 |
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+70 |
0 |
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+70 |
–55 |
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+125 |
°C |
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INPUT |
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BIAS CURRENT(1) |
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Input Bias Current |
VCM = 0VDC |
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±2.5 |
±8 |
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±1.3 |
±4 |
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±0.7 |
±2 |
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±43 |
±170 |
pA |
OFFSET CURRENT(1) |
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Input Offset Current |
VCM = 0VDC |
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1.1 |
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0.6 |
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0.6 |
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18 |
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pA |
OFFSET VOLTAGE(1) |
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Input Offset Voltage |
VCM = 0VDC |
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±2.2mV |
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±1mV |
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±750 |
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±1.5mV |
mV |
Average Drift |
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±20 |
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±10 |
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±5 |
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±10 |
mV/°C |
Supply Rejection |
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74 |
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114 |
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80 |
114 |
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80 |
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114 |
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80 |
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106 |
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dB |
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±2 |
±200 |
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±2 |
±100 |
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±2 |
±100 |
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±5 |
±100 |
mV/V |
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VOLTAGE RANGE(2) |
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Common-Mode Input Range |
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±10 |
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±11 |
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±10 |
±11 |
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±10 |
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±11 |
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±10 |
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±11 |
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V |
Commmon-Mode Rejection |
VIN = ±10VDC |
74 |
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112 |
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80 |
112 |
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80 |
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112 |
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74 |
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104 |
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dB |
OPEN-LOOP GAIN, DC |
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Open-Loop Voltage Gain |
RL ³ 2kW |
90 |
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125 |
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104 |
125 |
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104 |
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125 |
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90 |
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122 |
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dB |
RATED OUTPUT |
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Voltage Output |
RL = 2k½ |
±10 |
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±10 |
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±10 |
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±10 |
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V |
Current Output |
VO = ±10VDC |
±5 |
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±5 |
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±5 |
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±5 |
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mA |
Short Circuit Current |
VO = 0VDC |
10 |
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22 |
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10 |
22 |
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10 |
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22 |
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10 |
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18 |
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mA |
POWER SUPPLY |
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Current, Quiescent |
I = 0mADC |
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0.9 |
1.8 |
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0.9 |
1.8 |
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0.9 |
1.8 |
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0.9 |
2 |
mA |
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NOTES: (1) Offset voltage, offset current, and bias current are measured with the units fully warmed up. (2) If it is possible for the input voltage to exceed the supply voltage, a series protection resistor should be added to limit input current to 0.5mA. The input devices can withstand overload currents of 0.3mA indefinitely without damage.
CONNECTION DIAGRAM
Top View
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Substrate and Case |
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Offset |
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8 |
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1 |
7 |
+VCC |
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Trim |
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–In 2 |
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OPA128 |
6 Output |
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+In |
3 |
5 |
Offset |
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4 |
Trim |
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–VCC |
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ABSOLUTE MAXIMUM RATINGS
Supply ........................................................................................... |
±18VDC |
Internal Power Dissipation(1) .......................................................... |
500mW |
Differential Input Voltage ............................................................... |
±36VDC |
Input Voltage Range ..................................................................... |
±18VDC |
Storage Temperature Range .......................................... |
–65°C to +150°C |
Operating Temperature Range ....................................... |
–55°C to +125°C |
Lead Temperature (soldering, 10s) ................................................ |
+300°C |
Output Short Circuit Duration(2) ................................................ |
Continuous |
Junction Temperature .................................................................... |
+175°C |
NOTES: (1) Packages must be derated based on θCA = 150°C/W or θJA = 200°C/W. (2) Short circuit may be to power supply common only. Rating applies to +25°C ambient. Observe dissipation limit and TJ.
ORDERING INFORMATION
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TEMPERATURE |
BIAS CURRENT, |
MODEL |
PACKAGE |
RANGE |
max (fA) |
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OPA128JM |
TO-99 |
0°C to +70°C |
±300 |
OPA128KM |
TO-99 |
0°C to +70°C |
±150 |
OPA128LM |
TO-99 |
0°C to +70°C |
±75 |
OPA128SM |
TO-99 |
–55°C to +125°C |
±150 |
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PACKAGE INFORMATION
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PACKAGE DRAWING |
MODEL |
PACKAGE |
NUMBER(1) |
OPA128JM |
TO-99 |
001 |
OPA128KM |
TO-99 |
001 |
OPA128LM |
TO-99 |
001 |
OPA128SM |
TO-99 |
001 |
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NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book.
®
3 |
OPA128 |
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