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Analog Devices Inc. ADA4637-1ACPZ-R7
- Part No.:
- ADA4637-1ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
ADA4637-1ACPZ-R7.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:287
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Product details
Overview
ADA4637-1ACPZ-R7 from Analog Devices is a 30 V, decompensated JFET-input operational amplifier optimized for high-speed precision signal conditioning in demanding analog front-ends. It delivers 79 MHz gain bandwidth, 170 V/µs slew rate, 6.1 nV/√Hz voltage noise at 1 kHz, and 5 pA maximum input bias current - enabling accurate amplification of low-level sensor signals in professional audio, photodiode, and instrumentation systems.
For engineers reviewing the ADA4637-1ACPZ-R7 datasheet, ADA4637-1ACPZ-R7 pinout, ADA4637-1ACPZ-R7 application, or ADA4637-1ACPZ-R7 equivalent, key selection criteria include its minimum stable noise gain of 5, −40°C to +125°C extended temperature operation, LFCSP_VD (CP-8-13) 8-lead package with exposed pad, and JFET-input performance trade-offs versus bipolar or CMOS alternatives.
Technical Context
The ADA4637-1ACPZ-R7 is a decompensated voltage-feedback op amp requiring minimum noise gain ≥5 for stability - unlike its unity-gain-stable sibling ADA4627-1. Its JFET input stage enables ultra-low input bias current (≤5 pA) and low voltage noise (6.1 nV/√Hz), while maintaining high DC precision: 200 µV max offset voltage and 1 µV/°C typical drift.
It operates from ±5 V to ±15 V dual supplies (±15 V nominal), supports rail-referenced output swing (±12.3 V into 1 kΩ), and features no output phase reversal when inputs exceed supply rails - critical for robustness in transient-prone sensor interfaces and PLL filter applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 79 MHz - enables stable closed-loop operation up to 10× gain with >8 MHz small-signal bandwidth. |
| Slew Rate | 170 V/µs - supports fast settling (300 ns to 0.01%) for high-fidelity pulse and video signal amplification. |
| Voltage Noise Density | 6.1 nV/√Hz at 1 kHz - minimizes contribution to total system noise in precision transimpedance and DAC output stages. |
| Input Bias Current | 5 pA maximum - preserves signal integrity in high-impedance photodiode and piezoelectric sensor interfaces. |
| Offset Voltage | 200 µV maximum - ensures ≤2 mV output error at 10× gain, reducing need for trimming in production calibration. |
| Common-Mode Rejection | 116 dB typical - suppresses interference from noisy power rails or shared ground paths in mixed-signal PCBs. |
| Supply Range | ±5 V to ±15 V - accommodates industrial 24 V systems and legacy ±12 V designs without level-shifting. |
Pinout & Package
ADA4637-1ACPZ-R7 is housed in an 8-lead LFCSP_VD (CP-8-13) package with exposed thermal pad. The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (θJA = 77°C/W) and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No Connect | Internally unconnected; leave floating or tie to ground per layout best practice. |
| 2 - –IN | Inverting Input | Differential node for feedback network connection; guard trace required to preserve 5 pA bias current spec. |
| 3 - +IN | Noninverting Input | High-impedance reference node; requires guarding and clean layout to avoid leakage-induced offset. |
| 4 - V– | Negative Supply Rail | Connect to system negative rail; exposed pad recommended to be tied to this potential for thermal and noise control. |
| 5 - NC | No Connect | Internally unconnected; do not route signals or power to this pin. |
| 6 - OUT | Output | Capable of ±45 mA drive into resistive loads; requires local 0.01 µF ceramic + 1 µF bulk bypassing. |
| 7 - V+ | Positive Supply Rail | Connect to system positive rail; decoupling capacitors must be placed within 3 mm of this pin. |
| 8 - NC | No Connect | Internally unconnected; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated Stability | Stable only at noise gain ≥5 - enables higher bandwidth than unity-gain-stable equivalents without sacrificing phase margin (85°). |
| JFET Input Stage | 5 pA max input bias current and 6.1 nV/√Hz voltage noise - ideal for photodiode amps and high-Z sensor front-ends. |
| No Phase Reversal | Outputs remain monotonic even when inputs exceed supply rails - eliminates latch-up risk in overvoltage transients. |
| Extended Temperature Range | Specified from −40°C to +125°C - suitable for automotive under-hood, industrial motor control, and outdoor instrumentation. |
| Low Offset Drift | 1 µV/°C typical - limits total offset shift to <100 µV across full temperature range, easing system-level calibration. |
Applications
| Photodiode Amplifier | Precision Instrumentation |
|---|---|
|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon or InGaAs photodiodes in spectrometers and optical encoders. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with programmable gain, leveraging ultra-low input bias current and low voltage noise. Use Value: Enables sub-picoamp resolution without guard ring complexity or active bias cancellation circuitry. |
Use Scenario: Signal conditioning for strain gauges, RTDs, and thermocouples in portable test equipment and data loggers. IC Role / Device Role / Timing Role: Precision gain stage before 24-bit ΣΔ ADC, providing low-noise amplification and high CMRR rejection. Use Value: Maintains <1 LSB error contribution at 24-bit resolution due to 200 µV offset and 116 dB CMRR. |
| Professional Audio DAC Output | Phase-Locked Loop Filter |
|
Use Scenario: Post-filtering and buffering of high-resolution DAC outputs in studio monitors and digital mixers. IC Role / Device Role / Timing Role: Low-distortion output driver with THD+N < 0.000045% at 1 kHz, preserving dynamic range. Use Value: Delivers 120 dB SNR performance without requiring external trimming or auto-zero architecture. |
Use Scenario: Active loop filter in RF synthesizers and clock recovery circuits where phase noise and settling speed are critical. IC Role / Device Role / Timing Role: High-speed integrator with 79 MHz GBW and 300 ns 0.01% settling - accelerates lock time. Use Value: Reduces PLL acquisition time by >40% versus slower precision op amps while maintaining jitter < 100 fs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4627-1ACPZ-R7 | Unity-gain stable; 19 MHz GBW, 82 V/µs slew rate, lower power (±7.5 mA vs ±7.5 mA same, but lower dynamic current) | Preferred for variable-gain or unity-gain buffer stages where noise gain <5 is required | Select ADA4627-1ACPZ-R7 when circuit topology mandates gain <5 or when lower bandwidth suffices for cost/power optimization. |
| OPA827IDBVR | Bipolar input; 22 MHz GBW, 23 V/µs slew rate, 7.5 nV/√Hz noise, 10 nA bias current - higher speed than ADA4627-1 but less precision than ADA4637-1 | Better suited for medium-impedance sources (>10 kΩ) and moderate-speed, low-noise applications | Choose OPA827IDBVR when interfacing with lower-impedance sensors and where JFET-level bias current is unnecessary. |
Compared with ADA4627-1ACPZ-R7 and OPA827IDBVR, ADA4637-1ACPZ-R7 uniquely balances decompensated high bandwidth (79 MHz), JFET-input bias current (5 pA), and precision offset (200 µV) - making it optimal for fixed-gain ≥5, high-Z, wide-dynamic-range signal chains where speed and DC accuracy are co-critical.
Availability
ADA4637-1ACPZ-R7 is available at Aetrix Electronics and suitable for professional audio equipment, medical instrumentation, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADA4637-1ACPZ-R7 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 ADA4637-1ACPZ-R7 belongs to Analog Devices' high-speed precision op amp family, designed specifically for applications demanding simultaneous excellence in bandwidth, DC accuracy, and low-noise JFET input performance - especially in sensor front-ends and high-fidelity signal paths.
FAQ
What is the minimum stable gain for ADA4637-1ACPZ-R7?
The ADA4637-1ACPZ-R7 is decompensated and requires a minimum noise gain of 5 for stable operation. This means it cannot be used in unity-gain or gain-of-2 configurations without risking oscillation. For example, in noninverting mode, the closed-loop gain must be ≥5; in inverting mode, the noise gain equals 1 + RF/RIN, so RF/RIN ≥4 is required. Always verify phase margin using the open-loop gain/phase plot in the datasheet.
Does ADA4637-1ACPZ-R7 have offset adjust pins?
No, ADA4637-1ACPZ-R7 does not have offset adjust pins. The LFCSP_VD (CP-8-13) package variant - including ADA4637-1ACPZ-R7 - omits the offset null pins present in the SOIC version. Offset correction must be implemented externally via system-level calibration, digital compensation, or use of an auto-zero auxiliary amplifier in composite configurations.
What is the thermal pad connection requirement for ADA4637-1ACPZ-R7?
The exposed thermal pad on ADA4637-1ACPZ-R7 must be soldered to a PCB copper plane connected to the V– (negative supply) rail. This connection is mandatory for achieving the specified θJA = 77°C/W and preventing thermal runaway under sustained load. Do not leave the pad floating or connect it to ground unless V– is at ground potential - mismatched potentials cause leakage and reliability risk.
Can ADA4637-1ACPZ-R7 drive capacitive loads?
ADA4637-1ACPZ-R7 can drive moderate capacitive loads (≤100 pF) directly, but larger loads require isolation. Figure 45 in the datasheet shows stable response with 50 pF; beyond that, a series resistor (e.g., 10–50 Ω) between output and capacitance is recommended. For >500 pF loads, use a dedicated buffer or consider the unity-gain-stable ADA4627-1ACPZ-R7 instead - the decompensation makes ADA4637-1ACPZ-R7 more sensitive to capacitive loading.
Is ADA4637-1ACPZ-R7 suitable for single-supply operation?
ADA4637-1ACPZ-R7 is specified for dual-supply operation (±5 V to ±15 V) and is not characterized for true single-supply use. While it may function with asymmetric supplies (e.g., +15 V / 0 V), input common-mode range is limited to (V–) + 1.5 V to (V+) − 1.5 V, and output swing does not reach either rail. For single-supply designs, consider rail-to-rail alternatives like AD8676 or ADA4077-2 - ADA4637-1ACPZ-R7 should only be used in dual-rail systems.
ADA4637-1ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 170V/µs
- Gain Bandwidth Product:
- 79.9 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 120 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP (3x3)
ADA4637-1ACPZ-R7 FAQ
1.How can I place an order for ADA4637-1ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4637-1ACPZ-R7 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 ADA4637-1ACPZ-R7 reliable?
The price and inventory of ADA4637-1ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4637-1ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for ADA4637-1ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4637-1ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4637-1ACPZ-R7?
ADA4637-1ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4637-1ACPZ-R7 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 ADA4637-1ACPZ-R7?
For technical support, including ADA4637-1ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4637-1ACPZ-R7 requirements.
6.How does Aetrix verify that ADA4637-1ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADA4637-1ACPZ-R7 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 ADA4637-1ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of ADA4637-1ACPZ-R7?
All ADA4637-1ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4637-1ACPZ-R7, 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 ADA4637-1ACPZ-R7 part is unused and in its original packaging.
Return procedure for ADA4637-1ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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