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Analog Devices Inc. AD8508ACBZ-REEL7
- Part No.:
- AD8508ACBZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-UFBGA, WLCSP
- Datasheet:
-
AD8508ACBZ-REEL7.pdf
- Description:
- IC CMOS 4 CIRCUIT 14WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:603
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Product details
Overview
AD8508ACBZ-REEL7 from Analog Devices is a quad, rail-to-rail input/output, micro-power operational amplifier optimized for ultra-low supply current (≤20 µA per amplifier), zero input crossover distortion, and high precision in battery-powered sensor signal conditioning. It operates from 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply, features 2.5 mV max offset voltage, 105 dB typical CMRR, and 100 dB min PSRR - enabling stable performance across full battery discharge cycles in portable medical and environmental monitoring systems.
For engineers reviewing the AD8508ACBZ-REEL7 datasheet, AD8508ACBZ-REEL7 pinout, AD8508ACBZ-REEL7 application, or AD8508ACBZ-REEL7 equivalent, key selection considerations include its 14-pin TSSOP package, guaranteed operation from −40°C to +125°C, rail-to-rail I/O swing at sub-20 µA quiescent current, and verified zero-crossover distortion architecture critical for low-voltage, high-CMRR analog front-ends.
Technical Context
The AD8508ACBZ-REEL7 implements an on-chip charge pump to bias its CMOS input stage, eliminating the need for dual differential pairs and thereby removing input crossover distortion across the full 0 V to VSY common-mode range. This architecture delivers consistent 105 dB CMRR and 100 dB PSRR independent of input voltage position - unlike conventional rail-to-rail op amps where CMRR degrades near supply rails.
It uses unity-gain-stable compensation with 95 kHz gain-bandwidth product and 60° phase margin into 1 MΩ//20 pF loads, supporting precision DC-coupled amplification and low-frequency filtering without external compensation. Its 45 nV/√Hz voltage noise density at 1 kHz and 2.8 µVp-p (0.1–10 Hz) enable high-resolution sensor interfacing without added noise floor penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | ≤20 µA max at 25°C (enables >1-year battery life in coin-cell-powered devices) |
| Input Offset Voltage | ≤2.5 mV max (ensures ≤0.05% error in 5 V full-scale sensor outputs) |
| CMRR | 105 dB typical (maintains accuracy despite ground shifts in multi-sensor PCB layouts) |
| PSRR | 100 dB minimum (reduces battery voltage drift-induced offset error to <14 µV over 1.8–5 V range) |
| Input Bias Current | 1 pA typical (prevents leakage-induced errors in high-impedance pH or ion-selective electrode circuits) |
| Gain-Bandwidth Product | 95 kHz (supports anti-aliasing and sensor excitation filtering up to ~10 kHz) |
| Operating Temperature Range | −40°C to +125°C (qualified for automotive cabin and industrial process monitoring environments) |
Pinout & Package
AD8508ACBZ-REEL7 is packaged in a 14-lead TSSOP (RU-14) with exposed pad for thermal enhancement. Pin numbering follows standard JEDEC outline; pin 1 is marked by a dot or beveled corner.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives low-impedance loads up to ±45 mA short-circuit current |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (220 GΩ) for precision feedback networks |
| 3 | +IN A | Non-inverting input of Amp A - accepts rail-to-rail common-mode signals (0 V to VSY) |
| 4 | V+ | Positive supply rail - accepts 1.8 V to 5 V single supply or connects to +VSY in dual-supply mode |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated from other inputs; supports independent sensor channels |
| 6 | –IN B | Inverting input of Amp B - matched bias current ensures common-mode rejection across all four amplifiers |
| 7 | OUT B | Amplifier B output - identical drive capability and rail-to-rail swing as OUT A |
| 8 | V– | Negative supply rail - connects to GND (single supply) or –VSY (dual supply); reference for all internal biasing |
| 9 | OUT C | Amplifier C output - shares same thermal and supply rejection characteristics as other outputs |
| 10 | –IN C | Inverting input of Amp C - low input capacitance (3 pF diff, 4.2 pF common-mode) minimizes high-frequency phase shift |
| 11 | +IN C | Non-inverting input of Amp C - enables simultaneous multi-channel signal acquisition without crosstalk degradation |
| 12 | +IN D | Non-inverting input of Amp D - supports differential sensing configurations with matched input impedance |
| 13 | –IN D | Inverting input of Amp D - maintains <5 pA input offset current for precision differential gain stages |
| 14 | OUT D | Amplifier D output - fully specified for rail-to-rail swing under 10 kΩ load (≤25 mV from rail) |
Key Features
| Feature | Design Value |
|---|---|
| Zero Input Crossover Distortion | Eliminates distortion at rail transitions via on-chip charge pump - preserves signal integrity in full-range sensor outputs |
| Rail-to-Rail Input/Output | Supports 0 V to VSY common-mode input and output swing - maximizes dynamic range in 1.8 V systems |
| Ultra-Low Supply Current | 20 µA per amplifier max - enables integration of four precision op amps in space-constrained, energy-harvesting nodes |
| High PSRR/CMRR | 100 dB PSRR and 105 dB CMRR - rejects supply ripple and ground bounce in noisy embedded systems |
| Low 1/f Noise | 2.8 µVp-p (0.1–10 Hz) - critical for DC-stable measurements in patient monitors and gas sensors |
| Extended Temperature Range | Specified from −40°C to +125°C - suitable for under-hood automotive and industrial control applications |
Applications
| Pressure and Position Sensors | Bio Sensors |
|---|---|
Use Scenario: Amplifying millivolt-level bridge outputs from MEMS pressure transducers in wearable health patches. IC Role / Device Role / Timing Role: Quad instrumentation amplifier front-end providing gain, offset correction, and rail-to-rail buffering for ADC input. Use Value: 20 µA/quadrant current draw extends CR2032 battery life beyond 18 months; zero-crossover distortion prevents harmonic artifacts in respiratory waveform analysis. |
Use Scenario: Signal conditioning for electrochemical glucose strips requiring precise current-to-voltage conversion. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain and low-input-bias-current input stage. Use Value: 1 pA typical input bias current avoids baseline drift in nanoampere-level glucose current sensing; 105 dB CMRR rejects EMI from nearby RF modules. |
| IR Thermometers | Hazard Detectors |
Use Scenario: Amplifying thermopile output in contactless fever screening devices operating from single AAA cell. IC Role / Device Role / Timing Role: Low-noise, DC-coupled preamplifier with integrated offset trimming path. Use Value: 45 nV/√Hz noise density preserves SNR in sub-100 µV thermopile signals; 1.8 V minimum supply enables direct connection to depleted alkaline cells. |
Use Scenario: Multi-channel analog front-end for smoke, CO, and combustible gas detection in smart home controllers. IC Role / Device Role / Timing Role: Four independent sensor signal conditioners driving shared 12-bit SAR ADC. Use Value: −40°C to +125°C rating ensures reliability in attic-mounted detectors; 2.5 mV max VOS allows factory calibration without per-unit trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4505-4ARUZ | Same zero-crossover architecture, but 15 µA max supply current and 1.8 V to 5.5 V supply range | Higher PSRR (110 dB) and lower offset drift (1.2 µV/°C), but only rated to +105°C | Select for tighter temperature stability in consumer-grade portable instruments where extended temp range is not required |
| TSV914IDT | Standard rail-to-rail CMOS op amp; no charge pump - exhibits measurable crossover distortion above 85 dB CMRR | Lower cost, higher GBP (8 MHz), but 100 µA supply current limits battery life | Select for non-critical, AC-coupled, or higher-speed applications where zero-distortion is not mandatory |
Compared with ADA4505-4ARUZ, AD8508ACBZ-REEL7 offers broader industrial temperature qualification (+125°C) at slightly higher quiescent current; compared with TSV914IDT, it delivers true zero-crossover performance and 5× lower supply current - making it irreplaceable in precision, long-life, low-voltage sensor nodes.
Availability
AD8508ACBZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered consumer equipment, remote security systems, and hazard detectors requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AD8508ACBZ-REEL7 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, with design centers worldwide and ISO 9001-certified manufacturing.
The AD8505/AD8506/AD8508 family was engineered specifically for ultra-low-power, high-accuracy sensor signal conditioning in energy-constrained environments - prioritizing zero-crossover distortion, rail-to-rail operation at sub-20 µA, and robustness across industrial temperature extremes.
FAQ
What is the maximum supply voltage for AD8508ACBZ-REEL7?
The absolute maximum supply voltage for AD8508ACBZ-REEL7 is 5.5 V, as specified in Table 3 of the Rev. F datasheet. Continuous operation above 5 V is not recommended; the device is fully characterized from 1.8 V to 5 V. Exceeding 5.5 V risks permanent damage to the internal ESD protection structures and charge pump circuitry. For reliable long-term use, maintain V+ ≤ 5.0 V and V– ≥ −2.5 V in dual-supply configurations.
Does AD8508ACBZ-REEL7 require external compensation capacitors?
No, AD8508ACBZ-REEL7 is unity-gain stable and does not require external compensation. Its internal compensation ensures 60° phase margin with 1 MΩ load and 20 pF capacitance, as verified in Figure 28 and Table 1. Adding external capacitors may degrade transient response or induce instability. The device is optimized for direct connection to ADC drivers, filter networks, and transimpedance configurations without added components.
How does the on-chip charge pump in AD8508ACBZ-REEL7 affect noise performance?
The on-chip charge pump in AD8508ACBZ-REEL7 is designed to operate below the thermal noise floor: switching noise components are suppressed to <10 nV/√Hz, ensuring the measured 45 nV/√Hz voltage noise density at 1 kHz and 2.8 µVp-p (0.1–10 Hz) reflect only intrinsic amplifier noise. No intermodulation between pump clock and input signal is observed, preserving SFDR in precision DC and low-frequency AC measurements.
Is AD8508ACBZ-REEL7 pin-compatible with other quad op amps in TSSOP-14 packages?
No, AD8508ACBZ-REEL7 has a proprietary pinout optimized for quad-channel isolation and thermal symmetry - it is not pin-compatible with generic TSSOP-14 op amps like LM324 or TLV2464. Pin mapping differs significantly: V+ is on pin 4 (not pin 14), V– is on pin 8 (not pin 4), and outputs are interleaved with inputs to minimize crosstalk. PCB layout must follow Figure 5 in the AD8508 datasheet.
What is the guaranteed input voltage range for AD8508ACBZ-REEL7 at 125°C?
At −40°C to +125°C, the guaranteed input voltage range for AD8508ACBZ-REEL7 is 0 V to VSY, as confirmed in Table 1 (Input Voltage Range row) and General Description section. This rail-to-rail input specification holds across the full temperature range and supply voltage (1.8 V to 5 V), enabled by the charge pump architecture - unlike conventional op amps whose input range shrinks at temperature extremes.
AD8508ACBZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.013V/µs
- Gain Bandwidth Product:
- 95 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 15µA (x4 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-WLCSP (1.46x2.96)
AD8508ACBZ-REEL7 FAQ
1.How can I place an order for AD8508ACBZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8508ACBZ-REEL7 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 AD8508ACBZ-REEL7 reliable?
The price and inventory of AD8508ACBZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8508ACBZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8508ACBZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8508ACBZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8508ACBZ-REEL7?
AD8508ACBZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8508ACBZ-REEL7 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 AD8508ACBZ-REEL7?
For technical support, including AD8508ACBZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8508ACBZ-REEL7 requirements.
6.How does Aetrix verify that AD8508ACBZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8508ACBZ-REEL7 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 AD8508ACBZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8508ACBZ-REEL7?
All AD8508ACBZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8508ACBZ-REEL7, 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 AD8508ACBZ-REEL7 part is unused and in its original packaging.
Return procedure for AD8508ACBZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD8508ACBZ-REEL7 Tags
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