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OPA124

FEATURES

● LOW NOISE: 6nV/√Hz (10kHz)

● LOW BIAS CURRENT: 1pA max

● LOW OFFSET: 250

µV max

● LOW DRIFT: 2

µV/°C max

● HIGH OPEN-LOOP GAIN: 120dB min

● HIGH COMMON-MODE REJECTION:

100dB min

● AVAILABLE IN 8-PIN PLASTIC DIP

AND 8-PIN SOIC PACKAGES

APPLICATIONS

● PRECISION PHOTODIODE PREAMP

● MEDICAL EQUIPMENT

● OPTOELECTRONICS

● DATA ACQUISITION

● TEST EQUIPMENT

OPA124

DESCRIPTION

The OPA124 is a precision monolithic FET opera-

tional amplifier using a

Difet

(dielectrical isolation)

manufacturing process. Outstanding DC and AC per-

formance characteristics allow its use in the most

critical instrumentation applications.

Bias current, noise, voltage offset, drift, open-loop

gain, common-mode rejection and power supply re-

jection are superior to BIFET and CMOS amplifiers.

Difet

fabrication achieves extremely low input bias

currents without compromising input voltage noise

performance. Low input bias current is maintained

over a wide input common-mode voltage range with

unique cascode circuitry. This cascode design also

allows high precision input specifications and reduced

susceptibility to flicker noise. Laser trimming of thin-

film resistors gives very low offset and drift.

Compared to the popular OPA111, the OPA124 gives

comparable performance and is available in an 8-pin

PDIP and 8-pin SOIC package.

BIFET

National Semiconductor Corp.,

Difet

Burr-Brown Corp.

Low Noise Precision

Difet

OPERATIONAL AMPLIFIER

Substrate

Output

Trim

(1)

Noise-Free Cascode

(2)

Trim

(1)

+In

–In

–V

2kΩ

10kΩ

NOTES: (1) Omitted on SOIC. (2) Patented.

2kΩ

OPA124 Simplified Circuit

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

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

OPA124

SBOS028

Summary of content (13 pages)

PAGE 1
® OPA124 OPA 124 Low Noise Precision Difet ® OPERATIONAL AMPLIFIER FEATURES APPLICATIONS ● LOW NOISE: 6nV/√Hz (10kHz) ● LOW BIAS CURRENT: 1pA max ● PRECISION PHOTODIODE PREAMP ● MEDICAL EQUIPMENT ● LOW OFFSET: 250µV max ● LOW DRIFT: 2µV/°C max ● HIGH OPEN-LOOP GAIN: 120dB min ● OPTOELECTRONICS ● DATA ACQUISITION ● TEST EQUIPMENT ● HIGH COMMON-MODE REJECTION: 100dB min ● AVAILABLE IN 8-PIN PLASTIC DIP AND 8-PIN SOIC PACKAGES Substrate +VCC 8 7 DESCRIPTION The OPA124 is a precision monolithic FE
PAGE 2
SPECIFICATIONS ELECTRICAL At VCC = ±15VDC and TA = +25°C, unless otherwise noted. OPA124U, P PARAMETER CONDITION MIN MAX 80 40 15 8 1.2 3.3 15 0.8 ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ±200 ±4 110 100 ±800 ±7.5 VCM = 0VDC ±1 VCM = 0VDC ±1 VCM = 0VDC TA = TMIN to TMAX VCC = ±10V to ±18V TA = TMIN to TMAX BIAS CURRENT(1) Input Bias Current 88 84 TYP MAX 40 15 8 6 0.7 1.6 9.5 0.5 MIN OPA124PB TYP INPUT NOISE Voltage, fO = 10Hz(4) fO = 100Hz(4) fO = 1kHz(4) fO = 10kHz(5) fB = 10Hz to 10kHz(5) fB = 0.
PAGE 3
CONNECTION DIAGRAMS Top View DIP Offset Trim 1 8 Top View Substrate –In 2 7 +VS +In 3 6 Output –VS 4 5 Offset Trim SOIC NC 1 8 Substrate –In 2 7 +VS +In 3 6 Output –VS 4 5 NC NC = No Connect PACKAGE/ORDERING INFORMATION PRODUCT PACKAGE PACKAGE DRAWING NUMBER(1) OPA124U OPA124P OPA124UA OPA124PA OPA124PB 8-Lead SOIC 8-Pin Plastic DIP 8-Lead SOIC 8-Pin Plastic DIP 8-Pin Plastic DIP 182 006 182 006 006 TEMPERATURE RANGE BIAS CURRENT pA, max OFFSET DRIFT µV/°C, max
PAGE 4
TYPICAL PERFORMANCE CURVES At TA = +25°C, and VCC = ±15VDC, unless otherwise noted. INPUT CURRENT NOISE SPECTRAL DENSITY INPUT VOLTAGE NOISE SPECTRAL DENSITY 1k Voltage Noise (nV/√Hz) Current Noise (fA/√Hz) 100 10 1 PB 100 U, P PB 10 1 0.
PAGE 5
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, and VCC = ±15VDC, unless otherwise noted. BIAS AND OFFSET CURRENT vs TEMPERATURE 1k 1k 100 10 10 10 1 1 0.1 Bias Current (pA) PB 10 1 1 Bias Current Offset Current 0.1 0.1 0.01 –50 0 –25 25 50 75 0.01 125 100 0.01 0.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, and VCC = ±15VDC, unless otherwise noted.
PAGE 7
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, and VCC = ±15VDC, unless otherwise noted. SUPPLY CURRENT vs TEMPERATURE SETTLING TIME vs CLOSED-LOOP GAIN 4 100 Supply Current (mA) Settling Time (µs) 80 60 0.01% 40 0.
PAGE 8
APPLICATIONS INFORMATION +VCC OFFSET VOLTAGE ADJUSTMENT The OPA124 offset voltage is laser-trimmed and will require no further trim for most applications. In order to reduce layout leakage errors, the offset adjust capability has been removed from the SOIC versions (OPA124UA and OPA124U). The PDIP versions (OPA124PB, OPA124PA, and OPA124P) do have pins available for offset adjustment. As with most amplifiers, externally trimming the remaining offset can change drift performance by about 0.
PAGE 9
PACKAGE OPTION ADDENDUM www.ti.
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.com 7-Apr-2009 information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 11
PACKAGE MATERIALS INFORMATION www.ti.com 13-Feb-2009 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel Diameter Width (mm) W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant OPA124U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 OPA124UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
PAGE 12
PACKAGE MATERIALS INFORMATION www.ti.com 13-Feb-2009 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA124U/2K5 SOIC D 8 2500 346.0 346.0 29.0 OPA124UA/2K5 SOIC D 8 2500 346.0 346.0 29.
PAGE 13
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