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Texas Instruments OPA695IDGKT
- Part No.:
- OPA695IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA695IDGKT.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,989
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Product details
Overview
OPA695IDGKT from Texas Instruments is a current-feedback operational amplifier optimized for high-gain, wideband signal conditioning in precision instrumentation. It delivers 450MHz small-signal bandwidth at G = +8V/V, 4300V/μs slew rate (±5V), ±4.2V output swing, and –65dBc HD2 distortion at 10MHz - enabling high-fidelity ADC driver and arbitrary waveform generator output stages.
For engineers reviewing the OPA695IDGKT datasheet, OPA695IDGKT pinout, OPA695IDGKT application, or OPA695IDGKT equivalent, this page provides verified package mapping (VSSOP-8), disable-mode timing (1μs disable, 25ns enable), thermal performance (RθJA = 135°C/W), harmonic distortion vs load, and validated alternative options for broadband analog signal chain design.
Technical Context
The OPA695IDGKT uses a current-feedback architecture with low-impedance inverting input (29Ω) and high-impedance noninverting input (280kΩ || 1.2pF), enabling stable gain-setting via external feedback resistors without degrading bandwidth. Its transimpedance open-loop gain (45–85kΩ) and fast enable/disable control support dynamic power management in portable test equipment.
It operates across ±5V or single 5V supply, with CMIR of ±3.3V (±5V) or 1.7–3.3V (5V), PSRR of 51–56dB, and closed-loop output impedance under 0.05Ω at 100kHz - critical for driving reactive loads like coaxial cables or ADC input capacitance without peaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth (G = +8V/V) | 450MHz at ±5V supply - supports >200MS/s sampling in intermediate gain stages before ADC. |
| Slew rate | 4300V/μs (±5V) - enables clean 4VPP step response with <1ns rise time for pulse fidelity. |
| Output voltage swing | ±4.2V (no load, ±5V) - delivers full-scale drive into high-Z loads while maintaining linearity. |
| 2nd-harmonic distortion | –65dBc at 10MHz, 2VPP, RL = 100Ω - meets SNR requirements for 12-bit+ digitizers. |
| Disable quiescent current | 100–170μA (±5V) - reduces system standby power by >99% versus active mode (12.9mA). |
| Enable/disable timing | 25ns enable / 1μs disable - allows sub-microsecond channel gating in multi-channel instruments. |
| Input voltage noise | 1.8nV/√Hz above 1MHz - preserves dynamic range in low-noise IF amplification paths. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad connected to –VS per datasheet Figure 4-1 and Table 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Low-impedance buffered output capable of ±120mA drive into 100Ω loads. |
| 2 | –VS | Negative supply pin; thermal pad must be soldered to PCB ground plane or –VS trace. |
| 3 | +VS | Positive supply pin; decoupling required within 5mm for RF stability. |
| 4 | Inverting Input | Low-impedance (29Ω) node - sets feedback path; requires matched layout for S11 & stability. |
| 5 | Noninverting Input | High-impedance (280kΩ || 1.2pF) reference node - sensitive to parasitic capacitance. |
| 6 | DIS | Active-low disable control; threshold 1.7–1.8V (low), 3.3–3.5V (high); 75–130μA input bias. |
| 7 | NC | No connection - electrically isolated; may be used as thermal relief pad. |
| 8 | NC | No connection - electrically isolated; not bonded internally. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-wideband CFB architecture | Preserves bandwidth independent of closed-loop gain - 450MHz at G=+8V/V, 1700MHz at G=+1V/V (±5V). |
| Integrated disable function | Reduces supply current to <170μA with <1μs disable latency - ideal for battery-powered channel switching. |
| Low distortion at high frequency | –65dBc HD2 and –86dBc HD3 at 10MHz enable clean spectral purity in IF and video line drivers. |
| VSSOP-8 thermal optimization | RθJA = 135°C/W and RθJB = 56°C/W allow >100mW dissipation in compact layouts without heatsinking. |
| Single-supply compatible operation | Functions from 5V rail with 0.8–3.3V common-mode input range and 0.9–4.2V output swing. |
Applications
| ADC Driver | Arbitrary Waveform Generator |
|---|---|
Use Scenario: Driving the input of a 14-bit, 250MSPS pipeline ADC in a high-speed digitizer. IC Role / Device Role / Timing Role: Intermediate gain stage providing 8× amplification and 500MHz bandwidth to overcome track-and-hold droop. Use Value: Delivers –65dBc HD2 at 10MHz and 450MHz SSBW to preserve ENOB >11.5 bits at Nyquist. |
Use Scenario: Output buffer for a 16-bit current-steering DAC in a benchtop AWG with 200MHz update rate. IC Role / Device Role / Timing Role: Final output driver delivering ±4VPP into 50Ω coax with <1ns edge fidelity. Use Value: 4300V/μs slew rate and 25ns enable time support glitch-free channel multiplexing and burst waveform generation. |
| Portable Instrumentation | IF Amplifier |
Use Scenario: Gain block in handheld spectrum analyzer front-end operating from single 5V Li-ion battery. IC Role / Device Role / Timing Role: Low-power IF amplifier with on-demand shutdown between sweeps. Use Value: 12.9mA active current and 100μA shutdown current extend battery life >8× versus always-on alternatives. |
Use Scenario: 70MHz IF amplifier in software-defined radio receiver with 20MHz instantaneous bandwidth. IC Role / Device Role / Timing Role: Fixed-gain +8V/V stage with flat 0.2dB gain response up to 320MHz. Use Value: 320MHz 0.2dB flatness bandwidth and –62dBc HD3 ensure minimal EVM degradation in QAM-64 signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6723MA/NOPB | Lower bandwidth (320MHz @ G=+2), no disable pin, SOIC-8 only; higher input bias (±100μA). | Lacks fast enable/disable - unsuitable for power-gated portable instruments. | Choose when board space permits SOIC and disable functionality is unnecessary. |
| THS3491IRGTT | Higher slew rate (8000V/μs), wider SSBW (1.8GHz @ G=+1), but no integrated disable; WQFN-16 package. | Requires external enable circuitry and larger PCB area; better for ultra-high-speed fixed-function systems. | Prefer when >1GHz bandwidth is mandatory and power cycling is handled externally. |
Compared with LMH6723MA/NOPB and THS3491IRGTT, the OPA695IDGKT uniquely balances VSSOP-8 compactness, integrated disable, and 450MHz bandwidth at +8V/V - making it optimal for space-constrained, battery-aware instrumentation where rapid channel control is essential.
Availability
OPA695IDGKT is available at Aetrix Electronics and suitable for high-speed ADC driver, arbitrary waveform generator output, and portable instrumentation applications requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for OPA695IDGKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-speed amplifiers and precision signal chains.
The OPA695IDGKT belongs to TI's Ultra-Wideband Current-Feedback Op-Amp product line, engineered specifically for demanding intermediate-gain and output-driver roles in test equipment, communications infrastructure, and high-fidelity data acquisition systems.
FAQ
What is the maximum small-signal bandwidth of the OPA695IDGKT at ±5V supply?
The OPA695IDGKT achieves 450MHz small-signal bandwidth at G = +8V/V and ±5V supply, as specified in Section 5.7 of the official datasheet. This value is measured with RF = 402Ω and RL = 100Ω to VS/2 at TA = +25°C. Bandwidth scales inversely with gain: 1700MHz at G = +1V/V under identical conditions. The OPA695IDGKT maintains usable gain flatness up to 320MHz (0.2dB) in +2V/V configuration.
Does the OPA695IDGKT support single-supply operation?
Yes, the OPA695IDGKT operates from a single 5V supply, with common-mode input range of 1.7–3.3V and output swing of 0.8–4.2V (no load). Section 5.8 confirms performance at VS = 5V, including 395MHz SSBW at G = +8V/V and 1700V/μs slew rate. Input offset voltage remains ±3mV, and disable thresholds adapt to 5V logic levels (enable >3.3V, disable <1.8V).
How does the DIS pin function on the OPA695IDGKT?
The DIS pin on the OPA695IDGKT is an active-low enable control. Pulling DIS below 1.8V (typical) disables the amplifier, reducing quiescent current to 100–170μA and isolating the output with 70dB off-isolation at 10MHz. Enable occurs within 25ns when DIS rises above 3.3V. Input bias current is 75–130μA, and internal feedback resistance to Output is <1Ω in disable mode (DSG package), per Section 5.7.
What thermal considerations apply to the OPA695IDGKT in VSSOP-8 (DGK) package?
The OPA695IDGKT in DGK package has RθJA = 135°C/W and RθJB = 56°C/W (Section 5.4). To maintain TJ <125°C at 12.9mA IQ and 100mW dissipation, minimum 200mm² copper pour connected to the exposed thermal pad is recommended. Layout must tie the thermal pad directly to –VS or ground plane; floating pads cause >20°C junction rise. Derating begins above 70°C ambient per Figure 5-22.
Can the OPA695IDGKT drive a 50Ω coaxial cable directly?
Yes - the OPA695IDGKT delivers ±120mA output current and sustains ±3.9V swing into 100Ω (Section 5.7), making it suitable for 50Ω termination with series matching. For optimal return loss (S22 < –20dB to 500MHz), add a 22Ω series resistor at the output per Figure 5-16. Harmonic distortion remains –65dBc HD2 at 10MHz under these conditions, confirming suitability for video and IF line driving per Application section.
OPA695IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 4300V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.7 GHz
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 12.9mA
- Current - Output / Channel:
- 120 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA695IDGKT FAQ
1.How can I place an order for OPA695IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA695IDGKT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA695IDGKT reliable?
The price and inventory of OPA695IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA695IDGKT is usually 5 days.
3.What payment methods are accepted for OPA695IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA695IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA695IDGKT?
OPA695IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA695IDGKT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA695IDGKT?
For technical support, including OPA695IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA695IDGKT requirements.
6.How does Aetrix verify that OPA695IDGKT is sourced from the original manufacturer or authorized distributors?
All OPA695IDGKT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA695IDGKT meets industry standards.
7.What is the process for return or replacement of OPA695IDGKT?
All OPA695IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA695IDGKT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA695IDGKT part is unused and in its original packaging.
Return procedure for OPA695IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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