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REV. B

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OP275*

Dual Bipolar/JFET, Audio

Operational Amplifier

FEATURES

Excellent Sonic Characteristics

Low Noise: 6 nV/÷Hz

Low Distortion: 0.0006%

High Slew Rate: 22 V/␮s

Wide Bandwidth: 9 MHz

Low Supply Current: 5 mA

Low Offset Voltage: 1 mV

Low Offset Current: 2 nA

Unity Gain Stable

SOIC-8 Package

APPLICATIONS

High Performance Audio

Active Filters

Fast Amplifiers

Integrators

PIN CONNECTIONS

GENERAL DESCRIPTION

The OP275 is the first amplifier to feature the Butler Amplifier

front-end. This new front-end design combines both bipolar

and JFET transistors to attain amplifiers with the accuracy and

low noise performance of bipolar transistors, and the speed and

sound quality of JFETs. Total Harmonic Distortion plus Noise

equals that of previous audio amplifiers, but at much lower

supply currents.

A very low l/f corner of below 6 Hz maintains a flat noise density

response. Whether noise is measured at either 30 Hz or 1 kHz,

it is only 6 nV/÷Hz. The JFET portion of the input stage gives

the OP275 its high slew rates to keep distortion low, even when

large output swings are required, and the 22 V/ms slew rate of the

OP275 is the fastest of any standard audio amplifier. Best of all,

this low noise and high speed are accomplished using less than

5 mA of supply current, lower than any standard audio amplifier.

Improved dc performance is also provided with bias and offset

currents greatly reduced over purely bipolar designs. Input

offset voltage is guaranteed at 1 mV and is typically less than

200 mV. This allows the OP275 to be used in many dc coupled

or summing applications without the need for special selections

or the added noise of additional offset adjustment circuitry.

The output is capable of driving 600 W loads to 10 V rms while

maintaining low distortion. THD + Noise at 3 V rms is a low

0.0006%.

The OP275 is specified over the extended industrial (–40∞C to

+85∞C) temperature range. OP275s are available in both plastic

DIP and SOIC-8 packages. SOIC-8 packages are available in

2500 piece reels. Many audio amplifiers are not offered in SOIC-8

surface mount packages for a variety of reasons; however, the

OP275 was designed so that it would offer full performance in

surface-mount packaging.

8-Lead Narrow-Body SOIC

(S Suffix)

OP275

OUT A

–IN A

+IN A

V–

OUT B

–IN B

+IN B

V+

8-Lead Epoxy DIP

(P Suffix)

OP275

OUT B

–IN B

+IN B

V+OUT A

–IN A

+IN A

V–

Protected by U.S. Patent No. 5,101,126.

Summary of content (13 pages)

PAGE 1
Dual Bipolar/JFET, Audio Operational Amplifier OP275* FEATURES Excellent Sonic Characteristics Low Noise: 6 nV/÷Hz Low Distortion: 0.
PAGE 2
OP275 SPECIFICATIONS ELECTRICAL CHARACTERISTICS (@ V = ⴞ15.0 V, T = 25ⴗC, unless otherwise noted.
PAGE 3
OP275 ABSOLUTE MAXIMUM RATINGS1 Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 22 V Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 22 V Differential Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . ± 7.5 V Output Short-Circuit Duration to GND3 . . . . . . . . . Indefinite Storage Temperature Range P, S Package . . . . . . . . . . . . . . . . . . . . . . . . –65∞C to +150∞C Operating Temperature Range OP275G . . . . . . . . . . .
PAGE 4
OP275–Typical Performance Characteristics 1500 OPEN-LOOP GAIN – V/mV +VOM 10 5 0 –5 –10 –VOM –15 VS = ⴞ15V VO = ⴞ15V ⴞ5 ⴞ10 ⴞ15 ⴞ20 SUPPLY VOLTAGE – V –GAIN RL = 2k⍀ 750 500 0 –50 ⴞ25 20 90 10 45 +GAIN RL = 600⍀ –GAIN RL = 600⍀ –25 0 25 50 TEMPERATURE – ⴗC 75 0 –90 –30 –135 –40 –180 10k 100 90 MARKER 15 309.058Hz PHASE (A/R) 90.
PAGE 5
OP275 100 16 AVCL = +1 NEGATIVE EDGE 90 60 Øm 9 55 GBW 8 50 80 OVERSHOOT – % 10 MAXIMUM OUTPUT SWING – V 65 PHASE MARGIN – Degrees 70 60 AVCL = +1 POSITIVE EDGE 50 40 VS = ⴞ15V RL = 2k⍀ VIN = 100mV p-p 30 20 –25 0 25 50 TEMPERATURE – ⴗC 0 40 100 75 TPC 10. Gain Bandwidth Product, Phase Margin vs. Temperature 15 10 TA = 25ⴗC VS = ⴞ15V AVCL = +1 RL = 2k⍀ 4.5 TA = +85ⴗC TA = +25ⴗC 4.0 TA = –40ⴗC 3.5 3.
PAGE 6
OP275 10 200 BASED ON 920 OP AMPS VS = ⴞ15V TA = 25ⴗC 50 TA = 25ⴗC VS = ⴞ15V 8 160 45 6 +0.1% +0.01% UNITS 120 80 2 0 –2 –4 –0.01% –0.1% 40 40 SLEW RATE – V/␮s STEP SIZE – V 4 –6 35 –SR 30 +SR 25 –8 0 –500–400–300–200–100 0 100 200 300 400 500 INPUT OFFSET VOLTAGE – ␮V –10 TPC 19. Input Offset (VOS) Distribution 20 100 200 300 400 500 600 700 800 900 SETTLING TIME – ns TPC 20. Step Size vs.
PAGE 7
OP275 APPLICATIONS Circuit Protection THD + NOISE – % 0.010 OP275 has been designed with inherent short circuit protection to ground. An internal 30 W resistor, in series with the output, limits the output current at room temperature to ISC+ = 40 mA and ISC– = –90 mA, typically, with ± 15 V supplies. However, shorts to either supply may destroy the device when excessive voltages or currents are applied.
PAGE 8
OP275 effect from occurring in noninverting applications. For these applications, the fix is a simple one and is illustrated in Figure 9. A 3.92 kW resistor in series with the noninverting input of the OP275 cures the problem. Noise Testing For audio applications, the noise density is usually the most important noise parameter. For characterization, the OP275 is tested using an Audio Precision, System One. The input signal to the Audio Precision must be amplified enough to measure it accurately.
PAGE 9
OP275 16V–20V – + +15V 1k⍀ OUTPUT (TO SCOPE) 0.1␮F RL V+ D3 D4 1k⍀ 2N4416 + DUT 1/2 OP260AJ – + V– D1 1␮F D2 – 0.1␮F RF 2k⍀ 10k⍀ – + – IC2 10k⍀ 16V–20V RG 222⍀ 2N2222A ⴞ5V 1N4148 + 750⍀ 15k⍀ SCHOTTKY DIODES D1–D4 ARE HEWLETT-PACKARD HP5082-2835 IC1 IS 1/2 OP260AJ IC2 IS PMI OP41EJ –15V Figure 11. OP275’s Settling Time Test Fixture CFB +15V RFB 10␮F + 0.1␮F – 2 3 VIN RS 8 – RL 2k⍀ Figure 14.
PAGE 10
OP275 of the circuit and dc offset errors. If the parallel combination of RF and RG is larger than 2 kW, then an additional resistor, RS, should be used in series with the noninverting input. The value of RS is determined by the parallel combination of RF and RG to maintain the low distortion performance of the OP275. Driving Capacitive Loads The OP275 was designed to drive both resistive loads to 600 W and capacitive loads of over 1000 pF and maintain stability.
PAGE 11
OP275 OP275 SPICE Model * * Node assignments * noninverting input * inverting input * positive supply * negative supply * output ** .SUBCKT OP275 1 2 99 50 34 * * INPUT STAGE & POLE AT 100 MHz * R3 5 51 2.188 R4 6 51 2.188 CIN 1 2 3.7E-12 CM1 1 98 7.5E-12 CM2 2 98 7.5E-12 C2 5 6 364E-12 I1 97 4 100E-3 IOS 1 2 1E-9 EOS 9 3 POLY(1) 26 28 0.5E-3 1 Q1 5 2 7 QX Q2 6 9 8 QX R5 7 4 1.672 R6 8 4 1.
PAGE 12
OP275 OUTLINE DIMENSIONS 8-Lead Standard Small Outline Package [SOIC] (S suffix) (R-8) C03364–0–1/03(B) Dimensions shown in millimeters and (inches) 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 8 5 1 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY SEATING 0.10 PLANE 6.20 (0.2440) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.33 (0.0130) 0.50 (0.0196) ⴛ 45ⴗ 0.25 (0.0099) 8ⴗ 0.25 (0.0098) 0ⴗ 1.27 (0.0500) 0.41 (0.0160) 0.19 (0.
PAGE 13
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