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Analog Devices Inc. AD8644ARUZ
- Part No.:
- AD8644ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8644ARUZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:169
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Product details
Overview
AD8644ARUZ from Analog Devices is a quad-channel, rail-to-rail input/output operational amplifier optimized for LCD gamma/VCOM driver and portable instrumentation applications. It delivers 5.5 MHz unity-gain bandwidth, 7.5 V/μs slew rate, 1.0 mV typical input offset voltage, 70 mA output current per channel, and operates from 5 V to 18 V single supply.
For engineers reviewing the AD8644ARUZ datasheet, AD8644ARUZ pinout, AD8644ARUZ application, or AD8644ARUZ equivalent, this page provides verified specifications, TSSOP-14 package details, real-world use cases in LCD timing and audio line drivers, and validated alternative options for design continuity.
Technical Context
The AD8644ARUZ uses Analog Devices' high-voltage extra-fast complementary bipolar (HV XFCB) process with trench-isolated transistors to reduce parasitic capacitance-enabling stable operation with large capacitive loads and high phase margin (65°). Its dual complementary differential pair input stage supports true rail-to-rail common-mode range (0 V to VS) and prevents phase reversal within supply rails.
Each amplifier features 1.5 kΩ series input resistors for overvoltage protection and a double-folded cascode gain stage delivering 150 V/mV open-loop gain. Output stage design allows 125 mV rail-to-rail swing at 10 mA load, with no internal short-circuit protection-maximum safe continuous output current is 70 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-gain bandwidth | 5.5 MHz - enables stable closed-loop operation up to audio and video baseband frequencies without compensation. |
| Input offset voltage | 1.0 mV (typ) - ensures <±2.5 mV error across –20°C to +85°C, critical for precision DC-coupled VCOM control. |
| Slew rate | 7.5 V/μs - supports fast settling of gamma correction steps and transient response in LCD column drivers. |
| Output current | 70 mA per channel - drives heavy capacitive loads (e.g., LCD panel electrodes) without external buffers. |
| Supply range | 5 V to 18 V single supply - accommodates both portable (5 V) and industrial (18 V) LCD monitor power rails. |
| Rail-to-rail I/O | Inputs: 0 V to VS; Outputs: within 125 mV of rails at 10 mA - maximizes dynamic range in single-supply systems. |
| Quiescent current | 800 μA per amplifier - enables low-power operation in battery-powered instrumentation and modems. |
Pinout & Package
AD8644ARUZ is packaged in a 14-lead TSSOP (RU-14), RoHS-compliant, surface-mount package with 0.65 mm lead pitch and JEDEC MO-153-AB-1 compliance. Thermal resistance θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | –IN A | Inverting input of Amplifier A - accepts feedback signal in standard op-amp configurations. |
| 2 | +IN A | Non-inverting input of Amplifier A - referenced to ground or bias network for DC-coupled inputs. |
| 3 | V+ | Positive supply rail - connects to 5 V–18 V single supply; decoupling capacitor required near pin. |
| 4 | OUT B | Output of Amplifier B - drives external load directly; capable of sourcing/sinking 70 mA. |
| 5 | –IN B | Inverting input of Amplifier B - isolated from other channels; requires local feedback network. |
| 6 | +IN B | Non-inverting input of Amplifier B - electrically independent; used for differential or single-ended sensing. |
| 7 | OUT A | Output of Amplifier A - primary output for gamma/VCOM channel; rail-to-rail swing supports full-panel voltage range. |
| 8 | OUT C | Output of Amplifier C - available for auxiliary functions (e.g., reference buffer or microphone preamp). |
| 9 | –IN C | Inverting input of Amplifier C - supports unity-gain follower or active filter configuration. |
| 10 | +IN C | Non-inverting input of Amplifier C - tied to stable reference for precision buffering. |
| 11 | V– | Negative supply rail - connected to ground in single-supply operation; return path for all amplifiers. |
| 12 | +IN D | Non-inverting input of Amplifier D - used for second-stage gain or differential receive path in modem interfaces. |
| 13 | –IN D | Inverting input of Amplifier D - configured with matched resistors for difference amplifier topology. |
| 14 | OUT D | Output of Amplifier D - delivers final receive signal in direct access arrangement; low noise supports SNR-critical paths. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 5 V–18 V supply range without level-shifting circuitry in LCD gamma DAC interfaces. |
| Stable with large capacitive loads | Drives >47 nF directly (e.g., LCD electrode capacitance) without oscillation-eliminates need for isolation resistors. |
| High output current (70 mA) | Supports driving multiple parallel LCD segments or low-impedance audio loads (e.g., 32 Ω headphones via AC-coupled output). |
| Low input offset voltage (1.0 mV typ) | Reduces DC error in VCOM calibration loops, minimizing panel flicker and grayscale distortion. |
| HV XFCB process technology | Delivers 65° phase margin and 5.5 MHz bandwidth while maintaining 800 μA quiescent current per amplifier. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Precision gamma voltage generation for TFT-LCD panels using segmented DAC outputs. IC Role / Device Role / Timing Role: Quad op-amp configured as four independent voltage followers buffering gamma DAC outputs to panel electrode lines. Use Value: Rail-to-rail output swing ensures full 0–18 V VCOM range coverage; 70 mA drive capability eliminates external buffers for high-capacitance panel traces. | Use Scenario: Single-supply 5 V modem line interface implementing transmit/receive separation on 600 Ω telephone lines. IC Role / Device Role / Timing Role: Two amplifiers form transmit differential driver; two configure as receive difference amplifier and post-amplifier. Use Value: High CMRR (75 dB) and PSRR (110 dB) suppress coupling between Tx and Rx paths; 7.5 V/μs slew rate supports V.34/V.90 signaling fidelity. |
| Application 3 | Application 4 |
Use Scenario: PC-99-compliant headphone/line-out amplifier driven by AC'97 audio codec. IC Role / Device Role / Timing Role: Two amplifiers drive left/right headphone outputs; remaining two serve as microphone preamplifiers. Use Value: 70 mA output current drives 32 Ω loads directly; 12 nV/√Hz input voltage noise preserves audio SNR; rail-to-rail output avoids coupling capacitors. | Use Scenario: Portable handheld instrumentation requiring low-power, high-precision signal conditioning. IC Role / Device Role / Timing Role: Quad amplifier used for sensor signal buffering, anti-alias filtering, reference buffering, and analog output scaling. Use Value: 800 μA per amplifier enables multi-channel operation within 3.3 mA total supply budget; 5.5 MHz bandwidth supports fast step-response measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8644ARZ | Same die, SOIC-14 package (R-14); θJA = 120°C/W vs. 180°C/W for TSSOP; wider body, higher thermal mass. | Better thermal performance in high-power-density PCB layouts; less suitable for space-constrained portable designs. | Select AD8644ARZ when board area permits larger SOIC and thermal management prioritizes junction temperature over footprint. |
| OP484ESZ | Wider supply range (±1.5 V to ±18 V), lower offset (600 μV max), but higher quiescent current (1.2 mA/amplifier) and no guaranteed 70 mA drive. | Preferred for dual-supply precision instrumentation; not recommended for single-supply LCD VCOM where 70 mA drive is mandatory. | Choose OP484ESZ only if dual-supply operation and sub-millivolt offset outweigh drive strength and power requirements. |
Compared with AD8644ARZ and OP484ESZ, the AD8644ARUZ uniquely balances 70 mA output drive, 5.5 MHz bandwidth, and 800 μA quiescent current in a compact TSSOP-14 package-making it the only option qualified for high-current, space-constrained LCD gamma driver implementations.
Availability
AD8644ARUZ is available at Aetrix Electronics and suitable for LCD monitor manufacturing, modem line interface design, portable instrumentation development, and PC audio subsystem integration requiring stable component supply and RoHS-compliant packaging.
Supply support for AD8644ARUZ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD8644ARUZ belongs to the AD8614/AD8644 family-designed specifically for single-supply, high-output-current, rail-to-rail operational amplifier applications in LCD display systems and portable communications equipment.
FAQ
What is the operating temperature range for AD8644ARUZ?
The AD8644ARUZ is specified for operation from –20°C to +85°C ambient temperature. This range is validated across all electrical parameters including input offset voltage (max 3 mV), supply current (max 1.5 mA/amplifier), and output voltage swing. The device's junction temperature must remain ≤150°C under all conditions, requiring thermal derating per the 180°C/W θJA value in TSSOP-14 package.
Does AD8644ARUZ support true rail-to-rail input and output operation?
Yes, AD8644ARUZ supports rail-to-rail input common-mode range (0 V to V+) and rail-to-rail output swing (within 125 mV of each rail at 10 mA load). Input stage uses complementary NPN/PNP differential pairs with back-to-back diodes for protection; output stage employs complementary common-emitter transistors. Verified per Figure 5 and Table 1 in the Rev. B datasheet.
Can AD8644ARUZ drive capacitive loads without external compensation?
Yes, AD8644ARUZ is stable with large capacitive loads up to at least 47 nF, as confirmed in Figure 4 (small-signal overshoot vs. load capacitance) and Section "Capacitive Load Drive". For loads >10 nF, a snubber network (e.g., 30 Ω + 1 μF) may be added to reduce overshoot-though not required for stability. No isolation resistor is needed for LCD panel electrode driving.
What is the maximum safe output current for AD8644ARUZ?
The AD8644ARUZ has no internal short-circuit protection. Its maximum safe continuous output current is 70 mA per amplifier, as specified in Table 1 (Output Short-Circuit Current). Exceeding this-especially into a dead short-can cause permanent damage. For protection in fault-prone circuits, a series output resistor (e.g., 261 Ω for 18 V supply) within the feedback loop is recommended per Figure 25.
Is AD8644ARUZ pin-compatible with other packages in the AD8644 family?
No, AD8644ARUZ (TSSOP-14, RU-14) is not pin-compatible with AD8644AR (SOIC-14, R-14) or AD8644ARZ (SOIC-14, R-14). While both 14-lead packages share identical pin numbering and function mapping per Figures 2 and 3, the physical layout differs: RU-14 has narrower body width (4.4 mm vs. 8.6 mm) and tighter lead pitch (0.65 mm vs. 1.27 mm). PCB layout must be redesigned for package interchange.
AD8644ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 7.5V/µs
- Gain Bandwidth Product:
- 5.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 80 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 800µA (x4 Channels)
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 18 V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
AD8644ARUZ FAQ
1.How can I place an order for AD8644ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8644ARUZ 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 AD8644ARUZ reliable?
The price and inventory of AD8644ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8644ARUZ is usually 5 days.
3.What payment methods are accepted for AD8644ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8644ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8644ARUZ?
AD8644ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8644ARUZ 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 AD8644ARUZ?
For technical support, including AD8644ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8644ARUZ requirements.
6.How does Aetrix verify that AD8644ARUZ is sourced from the original manufacturer or authorized distributors?
All AD8644ARUZ 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 AD8644ARUZ meets industry standards.
7.What is the process for return or replacement of AD8644ARUZ?
All AD8644ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8644ARUZ, 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 AD8644ARUZ part is unused and in its original packaging.
Return procedure for AD8644ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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