OPA634U - Wideband Single-Supply Op Amp | Texas Instruments
부품 번호: OPA634U ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.42 | $342.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.75 | $2,750.00 |
OPA634U 개요
A wideband, single-supply operational amplifier is a type of analog integrated circuit that combines high small-signal bandwidth with the ability to operate from a single low-voltage rail (typically 3V or 5V), eliminating the need for symmetrical plus/minus supplies. Wideband amplifiers sit in the signal-chain hierarchy between general-purpose op-amps and dedicated RF gain blocks: they are faster than audio op-amps but lower in distortion and noise than full RF amplifiers. This makes them ideal for intermediate-frequency (IF) stages, video drivers, and high-speed transducer signal conditioning where rail-to-rail input and wide output swing are required simultaneously.
Key features include 200 MHz unity-gain bandwidth, 250 V/us slew rate, 5.6 nV/sqrt(Hz) input voltage noise density, 80 mA output current capability, and disable-free continuous operation. The architecture is a current-feedback topology optimized for low quiescent current while preserving large-signal behavior, allowing the OPA634U to drive 150 ohm loads to within 1V of either rail. The SOIC-8 package provides a familiar pinout and wide compatibility with hand-soldering and standard SMT assembly lines.
The internal design uses TI's high-speed complementary bipolar process, with a proprietary input stage that accepts signals from below ground to within 1.5V of the positive rail. This makes the OPA634U particularly effective as a single-to-differential buffer for high-speed ADCs, an active filter for IF stages, and a low-distribution pre-amplifier for video and instrumentation front-ends. Its wide bandwidth and high output drive also suit line-driver applications in industrial and broadcast video distribution.
Typical applications include high-speed single-to-differential ADC drivers, IF/RF signal-chain buffers, video line drivers, active filter implementations, transducer signal conditioning, and portable test equipment signal paths. The wide bandwidth and high slew rate make it especially well suited to applications up to 10 MHz where pulse fidelity and settling time are critical.
When designing with the OPA634U, take care to provide low-impedance source termination for current-feedback stability - the datasheet's recommended feedback resistor of 750 ohms at G=+2 should be respected. Decouple the +5V supply with a 0.1 uF ceramic placed within 5 mm of the supply pin and a 4.7 uF tantalum or ceramic bulk cap on the board-level rail. Avoid running the output trace near sensitive analog inputs to minimize crosstalk, and keep the inverting input trace short to preserve the high-frequency feedback loop.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: OPA634U — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: OPA634U (동일 폼 팩터 및 풋프린트) — 차이점: Package, Amplifier Type, Slew Rate, Input Voltage Noise Density, Manufacturer.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA635U
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →OPA634N
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM318M/NOPB
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
OPA634U 최대 정격 & 전기적 특성
| Manufacturer | Texas Instruments (Burr-Brown) |
| Part Family | OPA634 / OPA635 (SpeedPlus series) |
| Amplifier Type | Voltage Feedback |
| Number of Channels | 1 |
| Unity-Gain Bandwidth | 200 MHz |
| Slew Rate | 250 V/us |
| Input Voltage Noise Density | 5.6 nV/sqrt(Hz) |
| Supply Voltage (Single) | +5 V (typ) |
| Output Current | 80 mA |
| Output Voltage Swing (on +5V) | 4.8 V |
| Input Range | Includes Ground |
| Disable Function | No (OPA635 has disable) |
| Load Drive | 150 ohm to VS/2 |
| 패키지 | 8-SOIC |
| 핀 수 | 8 |
| 실장 유형 | Surface Mount |
| RoHS 상태 | unknown |
OPA634U 핀 구성
| 핀 1 | NC — Not connected (per datasheet, OPA634U has no disable pin) |
| 핀 2 | -IN — Inverting input |
| 핀 3 | +IN — Non-inverting input |
| 핀 4 | VS- — Negative supply (ground for single +5V operation) |
| 핀 5 | NC / Offset Null — Not connected (per datasheet) |
| 핀 6 | OUT — Amplifier output |
| 핀 7 | VS+ — Positive supply (+5V typical) |
| 핀 8 | NC — Not connected (per datasheet, OPA635U uses this as DISABLE) |
일반적인 애플리케이션
OPA634U 적합 용도: 6 애플리케이션s: Single-to-Differential ADC Driver, IF / RF Signal-Chain Buffer, Video Line Driver, Active Filter Implementation, Transducer Signal Conditioning, Portable Test Equipment Signal Path.
Single-to-Differential ADC Driver
The OPA634U's 200 MHz bandwidth and 250 V/us slew rate on a single +5V supply make it well suited as a single-ended-to-differential ADC driver. Its 0V-included input range allows direct coupling of ground-referenced signals without level shifting, while its 80 mA output current drives the typical 50-200 ohm differential load presented by high-speed ADCs. The 5.6 nV/sqrt(Hz) input voltage noise preserves SNR through the driver stage, and the SOIC-8 footprint simplifies placement close to the ADC input pins. When used at gain = +2 with the datasheet-recommended 750 ohm feedback resistor, the OPA634U maintains >100 MHz closed-loop bandwidth, which is adequate for ADCs up to 20 Msps.
추천
IF / RF Signal-Chain Buffer
With 200 MHz small-signal bandwidth and 250 V/us large-signal slew rate, the OPA634U is a strong fit for IF-stage buffering in communications receivers and signal analyzers up to 10 MHz. Its 5.6 nV/sqrt(Hz) input voltage noise preserves the noise floor of upstream mixers and filters, and its 80 mA output drive lets it feed 50 ohm loads with low distortion. The wideband single-supply operation simplifies board-level power design in portable RF instruments. For higher-frequency applications above 50 MHz, the OPA634U is less suitable; modern alternatives in the OPA8xx family offer better high-frequency linearity.
추천
Video Line Driver
The OPA634U drives 75 ohm video lines with 200 MHz of bandwidth, comfortably above the 5-6 MHz NTSC/PAL fundamental and well into HD video frequency ranges. Its 250 V/us slew rate ensures clean reproduction of fast chroma transitions, and the 4.8V output swing on +5V supports the full composite video amplitude without clipping. The 0V-included input range means sync-tip clamp circuits can be simplified, and the SOIC-8 footprint enables compact multi-channel video distribution layouts. For high-volume consumer video, the OPA634U is NRNR; for industrial or broadcast video where production quantities are smaller, it remains a viable choice.
추천
Active Filter Implementation
The OPA634U's combination of 200 MHz unity-gain bandwidth, 250 V/us slew rate, and 5.6 nV/sqrt(Hz) noise density makes it a strong choice for active filter sections from audio through low-MHz IF ranges. The wideband response keeps filter-Q stable at the upper edge of the passband, and the single +5V supply operation simplifies power tree design in mixed-signal boards. The 8-SOIC package enables dense filter sections on multi-pole implementations. Per the SBOS097A datasheet, the recommended feedback network for a Sallen-Key low-pass filter at G=+2 uses a 750 ohm resistor, matching the datasheet's test condition.
추천
Transducer Signal Conditioning
The OPA634U is well matched to high-speed transducer pre-amplifiers such as ultrasound receivers, photodiode amplifiers, and accelerometer front-ends where both bandwidth and low noise are required. Its 5.6 nV/sqrt(Hz) input voltage noise and 200 MHz bandwidth provide the gain-bandwidth-noise product needed to resolve small signals at MHz-rate modulation. The 80 mA output current can drive long cables with proper termination. For medical ultrasound and industrial NDT applications, the OPA634U's single-supply +5V operation simplifies the analog front-end power design significantly.
추천
Portable Test Equipment Signal Path
The OPA634U's single +5V supply operation, 200 MHz bandwidth, and 250 V/us slew rate fit handheld oscilloscope, signal-generator, and bench-meter signal paths. Its 80 mA output current can drive probes and short cables, and the 5.6 nV/sqrt(Hz) noise floor preserves measurement accuracy. The 8-SOIC package integrates into small-form-factor portable instruments where PCB real estate is at a premium. In battery-powered designs, the OPA635U drop-in alternative is preferred so the amplifier can be shut down between measurement cycles to extend battery life.
추천
추천 제품 요약
엔지니어링 참조 데이터: OPA634U — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA635U | OPA634N | LM318M/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Bandwidth | 200 MHz | 200 MHz | 200 MHz | 15 MHz |
| Slew Rate | 250 V/us | 250 V/us | 250 V/us | 50 V/us |
| Input Voltage Noise | 5.6 nV/sqrt(Hz) | 5.6 nV/sqrt(Hz) | 5.6 nV/sqrt(Hz) | 60 nV/sqrt(Hz) (typ) |
| Disable Pin | No | Yes (logic-low) | No | No |
| Output Current | 80 mA | 80 mA | 80 mA | 20 mA |
주요 차별점
- 200 MHz bandwidth in SOIC-8 single-supply form factor (vs LM318M/NOPB)
- 5.6 nV/sqrt(Hz) input voltage noise density (vs LM318M/NOPB)
- Single-supply +5V operation with 0V-included input range (vs OPA635U)
설계 노트
The OPA634U is a current-feedback amplifier and requires careful attention to the feedback network layout. Use the datasheet-recommended 750 ohm feedback resistor at G=+2 and keep the inverting input trace as short as possible (under 5 mm) to preserve high-frequency feedback loop stability. Place the input and feedback resistors on the same PCB layer to avoid parasitic inductance from vias. A ground plane on the opposite layer beneath the feedback network is recommended.
Decouple the +5V supply (pin 7) with a 0.1 uF X7R ceramic capacitor placed within 5 mm of the supply pin, and add a 4.7 uF tantalum or ceramic bulk capacitor on the board-level +5V rail. The high slew rate of 250 V/us makes the OPA634U sensitive to supply inductance; inadequate decoupling will appear as instability or ringing on the output. Keep the ground return from pin 4 short and direct to the ground plane.
Do not assume the OPA635U is identical to the OPA634U. Pin 1 and Pin 8 swap roles: pin 1 is NC on the OPA634U but the disable input on the OPA635U, and pin 8 is NC on the OPA634U but NC on the OPA635U (different NC). In designs that hold pin 1 high (logic high, disabled state on OPA635U), the OPA635U will not function. Confirm pin 1 is left floating or tied to GND for normal operation when substituting OPA635U for OPA634U.
규정 준수 정보
RoHS, REACH, lead-free, and halogen-free status not stated in the verified web data. AEC-Q100 not applicable (this is a general-purpose op-amp). Original manufacturer is Burr-Brown, now Texas Instruments. Compliance details should be confirmed against the official TI material declaration before use in regulated applications.
