OPA2670 - 700mA VDSL2 Line Driver Op Amp | Texas Instruments
MPN: OPA2670 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.29 | $4.29 |
| 10 | $3.86 | $38.60 |
| 100 | $3.43 | $343.00 |
| 500 | $3.08 | $1,540.00 |
| 1,000 | $2.74 | $2,740.00 |
Drop-in alternatives for OPA2670 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
OPA2675
β Drop-Inπ Reference alternative (not in catalog)
OPA2673
β Drop-Inπ Reference alternative (not in catalog)
THS6212
β‘ Same Packageπ Reference alternative (not in catalog)
THS6222
β‘ Same Packageπ Reference alternative (not in catalog)
THS6302
β‘ Same Packageπ Reference alternative (not in catalog)
OPA2670 Maximum Ratings & Electrical Characteristics
| Amplifier Type | Dual current-feedback operational amplifier (line driver) |
| Number of Channels | 2 |
| Supply Voltage | +12 V (single supply, nominal) |
| Supply Voltage Range | [DATA_NEEDED: min/max supply voltage range] |
| Quiescent Current (total) | 30.5 mA |
| Quiescent Current (per port) | 21 mA |
| Output Current | 700 mA (peak, >450 mA minimum guaranteed for xDSL) |
| Output Voltage Swing | Within 1 V of either supply rail |
| Input Topology | Current feedback (CFB) |
| Bandwidth | [DATA_NEEDED: -3dB bandwidth at gain of interest] |
| Slew Rate | [DATA_NEEDED: slew rate] |
| Power Control | Yes (power-save / disable pin) |
| Package | VQFN-16 (RGV), 4x4 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | [DATA_NEEDED: temperature range per I-suffix, typically -40C to +85C] |
| Typical Application | VDSL2, xDSL, PLC/Power Line Modem line driver |
| RoHS Status | [DATA_NEEDED: RoHS status] |
OPA2670 Pin Configuration
| Pin 1 | IN- (A) β Channel A inverting input |
| Pin 2 | IN+ (A) β Channel A non-inverting input |
| Pin 3 | V+ β Positive supply (+12V) |
| Pin 4 | PD (A) β Power-down / power-save control, channel A |
| Pin 5 | OUT (A) β Channel A output |
| Pin 6 | OUT (B) β Channel B output |
| Pin 7 | PD (B) β Power-down / power-save control, channel B |
| Pin 8 | V- β Negative supply or GND (single-supply operation) |
| Pin 9 | IN+ (B) β Channel B non-inverting input |
| Pin 10 | IN- (B) β Channel B inverting input |
| Pin 11 | EPAD β Exposed thermal pad - connect to ground plane |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OPA2670 is suitable for 6 applications: VDSL2 Line Driver, Power Line Communication (PLC) Driver, xDSL CO Line Card Driver, High-Current Output Buffer, Transformer-Coupled Transmit Amplifier, Test and Measurement Signal Drivers.
VDSL2 Line Driver
The OPA2670 is purpose-built for VDSL2 CO and CPE line drivers, where >450mA minimum output current is demanded by the most stringent profiles. Its current-feedback core sustains low distortion at VDSL2 frequencies up to 30MHz, while the 700mA peak output drives transformer-coupled loops with ample margin. Placed after the AFE line-stage with gain set by external resistors, its swing within 1V of the 12V rail maximizes transmitted signal power, and the power-save pin trims 21mA/port bias during idle periods to cut CPE power consumption.
Recommended
Power Line Communication (PLC) Driver
For HomePlug-class power line modems, the OPA2670 drives low-impedance mains-coupled networks through a coupling transformer. TI's PLC line driver portfolio includes this part, and TI E2E forum threads discuss OPA2670 specifically as a PLC line driver candidate. The 700mA output current and highly linear output stage keep harmonic distortion within PLC mask limits, while swing within 1V of either rail on a +12V supply maximizes transmit PSD. The power-control pin allows reduced bias in receive-only intervals, lowering overall modem power draw.
Recommended
xDSL CO Line Card Driver
Central-office line cards pack many ports per board, making the OPA2670's low 30.5mA total quiescent current valuable for thermal and power budgets. Its >450mA guaranteed minimum output current satisfies demanding ADSL2+/VDSL requirements while the current-feedback architecture maintains bandwidth across gain settings. Dual channels in one 16-VQFN (4x4 mm) package halve board area versus single drivers, and the exposed pad conducts output-stage heat into the PCB. Disabling unused ports via power control supports partial-fill deployments.
Recommended
High-Current Output Buffer
Beyond telecom, the OPA2670 serves as a general high-current buffer driving 50-ohm coaxial cables, piezo transducers, or inductive loads. The 700mA peak capability and current-feedback bandwidth independence from gain let it amplify fast edges into heavy loads without the gain-bandwidth penalty of voltage-feedback parts. Operating on a single +12V rail simplifies system power, and swing within 1V of the rails preserves dynamic range. Designers should budget thermal dissipation on the exposed pad for continuous high-current duty.
Recommended
Transformer-Coupled Transmit Amplifier
In differential transformer-coupled transmitters, the OPA2670's dual channels can be configured for single-ended-to-differential conversion into the transformer primary. The highly linear high-power output stage minimizes even-order and odd-order distortion that would leak into adjacent frequency bands - critical for DSL spectral masks and PLC EMC compliance. Gain-setting resistors set the drive level; back-termination resistors typically halve efficiency, so the 700mA rating provides needed headroom above the 350mA loop requirement.
Recommended
Test and Measurement Signal Drivers
Arbitrary waveform generators and line-simulation testers require amplifiers that maintain flat response and low distortion into 50-ohm or 100-ohm loads. The OPA2670's wideband current-feedback stage and 700mA drive address this class of problem, sustaining signal integrity where generic op amps slew-limit. Its power-save control is useful in battery-operated portable instruments, and the compact 4x4 mm VQFN suits dense instrument front ends. Verify stability with capacitive loads per the TI datasheet compensation guidance.
Recommended
Recommended Products Summary
Engineering reference data for OPA2670 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA2675 | OPA2673 | THS6212 |
|---|---|---|---|---|
| Package | VQFN-16 (RGV, 4x4 mm) | VQFN-16 (RGV, 4x4 mm) - same | VQFN-16 (RGV) | VQFN-16 (verify pinout) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 700 mA peak | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Quiescent Current | 30.5 mA (21 mA/port) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Input Topology | Current feedback | Current feedback | Current feedback | [DATA_NEEDED] |
| Supply Voltage (nominal) | +12 V single supply | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Power Save Control | Yes | [DATA_NEEDED] | [DATA_NEEDED] | Yes (adaptive power control) |
| Target Application | VDSL2 / xDSL / PLC line driver | High output current dual CFB amplifier | High output current dual amplifier | DSL line driver |
Key Differentiators
- 700mA peak output current at only 30.5mA quiescent (vs OPA2673)
- Pin-compatible TI alternative within same package (vs OPA2675)
- Power-save control for idle power reduction (vs THS6212)
Design Notes
At 700mA peak output, the OPA2670's output stage dissipates significant power, especially with back-termination resistors that consume half the drive voltage. Maximize the copper area connected to the exposed pad under the 16-VQFN (4x4 mm) package - use multiple thermal vias to inner ground layers. Estimate worst-case dissipation as (V+ - Vout_rms^2/Rload) + (Vout_rms^2/Rterm) plus 30.5mA x 12V quiescent, and keep junction temperature within the datasheet maximum.
As a current-feedback amplifier, the OPA2670's inverting input node is sensitive to stray capacitance. Keep feedback resistor traces short, use the recommended feedback and gain resistor values from the TI datasheet (RF values strongly affect stability and bandwidth in CFB parts), and place decoupling capacitors (e.g., 6.8uF tantalum plus 0.1uF ceramic per rail) close to the V+ and V- pins with a solid ground return.
Do not substitute resistor values casually: in current-feedback amplifiers, closed-loop bandwidth is set by the feedback resistor, not the ratio alone, and halving RF can cause peaking or oscillation. Also, when using the power-down pins, observe the enable/disable timing to avoid output glitches on the line. Never leave the exposed pad unconnected - it is the primary thermal and often the ground return path.
Compliance Information
[DATA_NEEDED: RoHS/REACH/lead-free status per TI product page and DigiKey compliance data]
