OPA2670 - 700mA VDSL2 Line Driver Op Amp | Texas Instruments
MPN: OPA2670 ✓ فعالOPA2670 نمای کلی
A line driver is a high-current power operational amplifier positioned at the output of a modem AFE (analog front end) to drive low-impedance telephone or power-line networks through a transformer. Within the signal-chain hierarchy, it sits under amplifier ICs > operational amplifiers > high-output-current/DSL line driver amplifiers, where linearity and output current, not just bandwidth, define system performance.
Key features include the exceptional AC performance of a current-feedback topology combined with a highly linear, high-power output stage, enabling low distortion into heavy loads. The output swings to within 1V of either supply rail, maximizing usable voltage headroom on a +12V rail. Power-control pins allow the amplifier to be disabled or operated at reduced bias for power saving during idle line conditions - critical for battery-backed or thermally constrained CPE (customer premises equipment).
Architecturally, the current-feedback input stage provides bandwidth largely independent of closed-loop gain, sustaining low distortion at DSL frequencies (up to 30MHz VDSL2 profiles) while the robust output stage maintains linearity at high peak currents. The power-save pin lets designers trade bias current for idle power.
Typical applications include VDSL2/xDSL CO and CPE line drivers, HomePlug/PLC differential drivers, high-current ADC output buffers, and transformer-coupled line transmitters.
Design consideration: ensure adequate PCB copper on the exposed pad for thermal dissipation at sustained high output current, and use the power-save feature to limit junction temperature during idle periods.
جایگزین‌های drop-in برای OPA2670 — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
OPA2675
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
OPA2670 حداکثر مقادیر مجاز و مشخصات الکتریکی
| Amplifier Type | Current-Feedback Operational Amplifier (Line Driver) |
| کانال‌ها | 2 (Dual) |
| Output Current | 700 mA |
| ولتاژ تغذیه | +12 V single supply |
| جریان سکون | 30.5 mA (21 mA per port) |
| Output Swing | Within 1 V of either rail |
| توپولوژی | Current feedback with power control |
| Application | VDSL2, xDSL, PLC line driver |
| بسته‌بندی | VQFN-16 (RGV, 4x4 mm) |
| نوع نصب | Surface Mount |
| Power Control | Yes (disable/power-save pins) |
| وضعیت RoHS | Compliant |
پیکربندی پین OPA2670
| پین 1 | IN- (A) — Channel A inverting input |
| پین 2 | IN+ (A) — Channel A non-inverting input |
| پین 3 | [DATA_NEEDED: pin 3 name] — [DATA_NEEDED] |
| پین 4 | [DATA_NEEDED: pin 4 name] — [DATA_NEEDED] |
| پین 5 | [DATA_NEEDED: pin 5 name] — [DATA_NEEDED] |
| پین 6 | [DATA_NEEDED: pin 6 name] — [DATA_NEEDED] |
| پین 7 | V+ — Positive supply (+12V) |
| پین 8 | [DATA_NEEDED: pin 8 name] — [DATA_NEEDED] |
| پین 9 | OUT (A) — Channel A output |
| پین 10 | [DATA_NEEDED: pin 10 name] — [DATA_NEEDED] |
| پین 11 | Power Save/Disable — Power control pin |
| پین 12 | [DATA_NEEDED: pin 12 name] — [DATA_NEEDED] |
| پین 13 | OUT (B) — Channel B output |
| پین 14 | [DATA_NEEDED: pin 14 name] — [DATA_NEEDED] |
| پین 15 | IN- (B) — Channel B inverting input |
| پین 16 | IN+ (B) — Channel B non-inverting input |
کاربردهای معمول
OPA2670 مناسب است برای 6 کاربردs: VDSL2 Line Driver, Power Line Communication (PLC) Modem Driver, xDSL CO Line Card, CPE Modem Line Driving, High-Current ADC Output Buffer, Transformer-Coupled Line Transmitter.
VDSL2 Line Driver
The OPA2670 was designed specifically as a single-port VDSL2 line driver, providing the >450mA minimum output current demanded by the most stringent xDSL profiles while delivering up to 700mA peak. Its current-feedback topology sustains low distortion at VDSL2 signal frequencies, and the output swings within 1V of the rails to maximize transformer drive on a +12V supply. Power-control pins cut the 21mA-per-port bias during idle periods, reducing thermal load in dense CO line cards.
پیشنهادی
Power Line Communication (PLC) Modem Driver
For HomePlug-class PLC modems, the OPA2670 differentially drives low-impedance power-line coupling networks through a transformer with up to 700mA output current. The 1V-from-rail output swing on a +12V supply maximizes delivered line power, while the power-save feature reduces the 30.5mA total quiescent current when the channel is idle - important for smart-meter and HomePlug GreenPHY-adjacent designs with thermal or energy constraints.
پیشنهادی
xDSL CO Line Card
In central-office DSLAM line cards, density and thermal budget dominate. The OPA2670's low 21mA-per-port quiescent current plus power-save control allow hundreds of ports per shelf without excessive heating, while the 700mA capability and linear high-power output stage preserve DSL spectral mask compliance into 100-ohm transformer loads. The compact VQFN-16 4x4mm footprint conserves board area per port.
پیشنهادی
CPE Modem Line Driving
Customer premises equipment benefits from the OPA2670's power-control pins, which disable or reduce bias during idle line conditions to cut the 21mA-per-port draw - extending battery-backup runtime in ONTs and gateways. Its 700mA output meets all VDSL2 profile requirements at the CPE side, and the VQFN-16 package suits space-limited residential hardware.
پیشنهادی
High-Current ADC Output Buffer
Beyond DSL, the OPA2670 serves as a high-current buffer for DAC/ADC output stages driving heavy or low-impedance loads. The current-feedback input stage keeps bandwidth nearly constant with closed-loop gain, and the linear high-power output stage preserves signal fidelity at high peak currents. The 1V-from-rail swing on +12V maximizes usable voltage range in 12V-single-supply acquisition systems.
پیشنهادی
Transformer-Coupled Line Transmitter
Any design transmitting signals through a transformer into a low-impedance line - telecom pairs, power lines, or specialty networks - can use the OPA2670's 700mA drive and wideband current-feedback response. Configured as a differential driver, it delivers balanced drive across the primary while the power-save pin trims bias during silent intervals, reducing average system power without redesign.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای OPA2670 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | OPA2675 | THS6212 | THS6222 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Pin Compatible (Drop-In) | - | Yes - same package and pinout | No - redesign required | No - redesign required |
تفاوت‌های کلیدی
- Highest output current in its TI line-driver class (در مقابلTHS6212)
- True drop-in compatibility within the OPA267x family (در مقابلOPA2675)
- Integrated power-save control (در مقابلOPA2673)
یادداشت‌های طراحی
At 700mA peak output into a transformer load, junction heating is significant. Solder the VQFN-16 exposed pad to a substantial ground copper pour (multiple thermal vias to inner layers) to keep junction temperature within limits. Use the power-save feature during idle line periods to cut the 21mA-per-port bias and reduce average dissipation in thermally constrained CO line cards or CPE hardware.
As a current-feedback amplifier, the OPA2670 is sensitive to feedback-loop stray capacitance and inductance. Keep the feedback resistor network short, use surface-mount resistors with appropriate values (per datasheet recommended feedback/gain resistor combinations), and place decoupling capacitors (e.g., 6.8uF bulk plus 0.1uF ceramic per supply pin) directly at the V+ pins with a low-inductance ground return on the exposed pad.
Do not substitute a voltage-feedback compensation approach: current-feedback amplifiers require datasheet-specified feedback resistor values and cannot use capacitive feedback directly. Also verify power-save pin logic levels in the datasheet before wiring disable control - mis-driving the power-control pin may leave the device in reduced-bias mode and degrade linearity during active bursts.
اطلاعات انطباق
RoHS compliant per TI product page. Other compliance attributes not stated in verified data.
