OPA2670 - 700mA VDSL2 Line Driver Op Amp | Texas Instruments
MPN: OPA2670 ✓ Hoạt độngOPA2670 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho OPA2670 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
OPA2675
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
OPA2670 Tỷ lệ tối đa & tính chất điện
| Amplifier Type | Current-Feedback Operational Amplifier (Line Driver) |
| Kênh | 2 (Dual) |
| Output Current | 700 mA |
| Điện áp cung cấp | +12 V single supply |
| Điện áp yên tĩnh | 30.5 mA (21 mA per port) |
| Output Swing | Within 1 V of either rail |
| Cấu trúc | Current feedback with power control |
| Application | VDSL2, xDSL, PLC line driver |
| Hộp | VQFN-16 (RGV, 4x4 mm) |
| Kiểu lắp đặt | Surface Mount |
| Power Control | Yes (disable/power-save pins) |
| Trạng thái RoHS | Compliant |
Cấu hình chân OPA2670
| Chân 1 | IN- (A) — Channel A inverting input |
| Chân 2 | IN+ (A) — Channel A non-inverting input |
| Chân 3 | [DATA_NEEDED: pin 3 name] — [DATA_NEEDED] |
| Chân 4 | [DATA_NEEDED: pin 4 name] — [DATA_NEEDED] |
| Chân 5 | [DATA_NEEDED: pin 5 name] — [DATA_NEEDED] |
| Chân 6 | [DATA_NEEDED: pin 6 name] — [DATA_NEEDED] |
| Chân 7 | V+ — Positive supply (+12V) |
| Chân 8 | [DATA_NEEDED: pin 8 name] — [DATA_NEEDED] |
| Chân 9 | OUT (A) — Channel A output |
| Chân 10 | [DATA_NEEDED: pin 10 name] — [DATA_NEEDED] |
| Chân 11 | Power Save/Disable — Power control pin |
| Chân 12 | [DATA_NEEDED: pin 12 name] — [DATA_NEEDED] |
| Chân 13 | OUT (B) — Channel B output |
| Chân 14 | [DATA_NEEDED: pin 14 name] — [DATA_NEEDED] |
| Chân 15 | IN- (B) — Channel B inverting input |
| Chân 16 | IN+ (B) — Channel B non-inverting input |
Ứng dụng tiêu biểu
OPA2670 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho OPA2670 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Highest output current in its TI line-driver class (vsTHS6212)
- True drop-in compatibility within the OPA267x family (vsOPA2675)
- Integrated power-save control (vsOPA2673)
Ghi chú thiết kế
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.
Thông tin tuân thủ
RoHS compliant per TI product page. Other compliance attributes not stated in verified data.
