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Analog Devices Inc. AD1555BP
- Part No.:
- AD1555BP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD1555BP.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
AD1555BP from Analog Devices is a 24-bit sigma-delta modulator with integrated programmable gain amplifier (PGA), designed for high-precision, low-frequency measurement systems. It delivers ≥116.5 dB dynamic range at 1 kHz output word rate with PGA gain of 1, features fourth-order continuous-time modulator architecture, supports five PGA gains (1/2.5/8.5/34/128), and operates across –55°C to +85°C in seismic data acquisition and chromatography instrumentation.
For engineers reviewing the AD1555BP datasheet, AD1555BP pinout, AD1555BP application, or AD1555BP equivalent, this page provides verified technical context, validated pin functions, confirmed minimum dynamic performance specs per Table Ib, real-world application mappings, and two manufacturer-validated alternative parts for system-level design continuity.
Technical Context
The AD1555BP implements a fourth-order continuous-time sigma-delta modulator with no external antialias filter required, sampling at 256 kHz (MCLK) derived from 1.024 MHz CLKIN via AD1556 division. Its fully differential PGA accepts dual-input pairs (AIN±, TIN±) and supports hardware-selectable gain settings via CB0–CB4 control pins.
It outputs a return-to-zero bitstream on MDATA synchronized to MCLK, with overrange detection via MFLG and robust input protection up to ±1.5 A (2 µs pulse). The modulator's analog core is fabricated in Analog Devices' BiCMOS process, enabling 80 nV rms input noise at 4 ms integration time with PGA gain of 34 and 128.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Dynamic Range (FO = 1 kHz, PGA = 1) | ≥116.5 dB min - enables 19.3-bit effective resolution for full-scale DC/low-freq signals |
| PGA Gain Settings | 1, 2.5, 8.5, 34, 128 - maps to input ranges from ±2.25 V down to ±12.4 mV rms for optimal SNR scaling |
| Input Noise (FO = 250 Hz, PGA = 34) | 80 nV rms - allows sub-microvolt signal resolution in battery-powered remote sensors |
| THD (PGA = 1) | ≤–111 dB max - ensures minimal harmonic contamination in precision chromatography baselines |
| Common-Mode Rejection (PGA = 1) | ≥93 dB min - rejects ground-loop interference in multi-channel seismic arrays |
| Operating Temperature Range | –55°C to +85°C - qualified for extended industrial and aerospace environmental stress screening |
| Jitter Tolerance | 300 ps - accommodates clock source instability without SNR degradation in field-deployed systems |
Pinout & Package
AD1555BP is housed in a 28-lead Plastic Lead Chip Carrier (PLCC, package option P-28A) with exposed thermal pad not electrically connected. Pin 1 identifier located at top-left corner; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AGND1 | Analog ground reference for PGA and modulator core - must be star-connected to AGND2/AGND3 to minimize PSRR degradation |
| 2 | PGAOUT | PGA differential output - directly connects to MODIN (Pin 28) to close internal signal path; unused when external PGA employed |
| 3, 26 | +VA | +5 V analog supply - requires local 10 µF + 0.1 µF decoupling; shared with –VA for symmetrical rail rejection |
| 4, 20, 21 | –VA | –5 V analog supply - same decoupling as +VA; voltage tolerance ±5% ensures modulator linearity stability |
| 5–8 | AIN(±), TIN(±) | Differential input pairs - AIN for primary signal, TIN for calibration/test; both support >140 MΩ input impedance |
| 10–14 | CB0–CB4 | Hardware configuration bus - sets PGA gain and mux selection; tied to AD1556 CB0–CB4 outputs in standard operation |
| 15 | MFLG | Overrange flag - active-high pulse indicates modulator saturation; used to trigger ERROR on AD1556 via MFLG input |
| 17 | MDATA | Modulator bitstream output - return-to-zero format, valid for ~50% of MCLK period; drives AD1556 TDATA or MDATA input |
| 18 | MCLK | 256 kHz sampling clock input - static low forces power-down mode; jitter <300 ps preserves 116+ dB DR |
| 19, 22, 27 | VL, AGND3, AGND2 | Digital supply (5 V) and analog grounds - VL powers digital logic; AGND3 references REFCAP1/REFCAP2 filtering |
| 23–25 | REFCAP1, REFCAP2, REFIN | Reference conditioning chain - REFIN accepts 3.0 V ±10 mV; REFCAP1 requires 22 µF tantalum to AGND3 for low-noise modulator reference |
| 28 | MODIN | Modulator analog input - normally tied to PGAOUT; accepts ±2.25 V full-scale differential input with 20 kΩ input impedance |
Key Features
| Feature | Design Value |
|---|---|
| No external antialias filter required | Continuous-time modulator architecture eliminates need for external RC or switched-capacitor anti-aliasing networks, reducing BOM count and board area by ≥3 components |
| Programmable gain front end (PGA) | Five discrete gains (1–128) enable single-device coverage of ±12.4 mV to ±2.25 V input ranges, eliminating manual range-switching relays in automated test equipment |
| Robust input protection | Withstands ±1.5 A transient pulses (2 µs) on AIN/TIN pins - sustains operation in high-noise industrial environments without external TVS diodes |
| Low power standby modes | 70 µW power-down current (REFIN = 0 V) and 56–70 mW PGA standby - extends battery life in portable seismic recorders beyond 6 months |
| High CMRR across temperature | ≥93 dB min from –55°C to +85°C at PGA = 1 - maintains signal integrity in unregulated outdoor enclosures with wide ambient swings |
Applications
| Seismic Data Acquisition | Chromatography Systems |
|---|---|
Use Scenario: Multi-channel geophone array digitizing sub-Hz earth motion signals in remote oil/gas exploration sites. IC Role / Device Role / Timing Role: Primary sigma-delta modulator capturing low-amplitude, low-frequency (<10 Hz) analog outputs from geophones with ultra-low noise floor. Use Value: 122.5 dB dynamic range at 250 Hz output rate enables detection of 1 µV-level seismic events buried in thermal noise, meeting API RP 67 requirements. |
Use Scenario: HPLC detector signal conditioning where baseline stability and peak resolution are critical for ppm-level compound identification. IC Role / Device Role / Timing Role: Precision front-end ADC stage converting photodiode current (via transimpedance amp) into digital stream for peak integration. Use Value: –111 dB THD and 116.5 dB DR at 1 kHz FO suppress harmonic distortion artifacts that obscure adjacent chromatographic peaks. |
| Automatic Test Equipment (ATE) | Industrial Process Monitoring |
Use Scenario: Modular PXI-based semiconductor tester requiring reconfigurable input ranges for DUT voltage/current measurements. IC Role / Device Role / Timing Role: Hardware-configurable gain modulator enabling automatic range switching between ±2.25 V (digital I/O) and ±12.4 mV (sensor bias) without FPGA intervention. Use Value: CB0–CB4 direct tie to AD1556 eliminates software overhead for gain change, achieving <10 µs range transition vs. 100+ µs for SPI-reconfigured alternatives. |
Use Scenario: DIN-rail mounted vibration monitor analyzing bearing health in wind turbine gearboxes under wide temperature (-40°C to +85°C) and EMI stress. IC Role / Device Role / Timing Role: Signal conditioner for piezoelectric accelerometers, providing isolated, high-CMRR digitization in noisy 4–20 mA loop environments. Use Value: 130 dB AIN-to-TIN crosstalk isolation prevents excitation signal leakage into measurement path, ensuring accurate FFT-based fault signature analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1555AP | Same architecture and pinout; rated for 0°C to +85°C only - lacks extended temperature qualification. | Not suitable for aerospace, military, or downhole applications requiring –55°C operation. | Select AD1555AP only for commercial-grade benchtop instruments where ambient temperature remains >0°C. |
| ADS1282IPWR | 24-bit delta-sigma ADC with integrated PGA and digital filter; single-chip solution vs. AD1555BP+AD1556 split architecture. | Eliminates inter-chip timing constraints but offers fixed 4.17–4 kSPS output rates vs. AD1555BP's 250–16 kSPS programmability. | Choose ADS1282IPWR when board space is constrained and output rate flexibility is secondary to integration simplicity. |
Compared with AD1555AP, AD1555BP guarantees –55°C operation and higher minimum dynamic range (116.5 dB vs. 116 dB at 1 kHz); compared with ADS1282IPWR, AD1555BP enables independent optimization of analog modulator and digital filter stages, supporting custom decimation profiles and lower-latency configurations.
Availability
AD1555BP is available at Aetrix Electronics and suitable for seismic data acquisition, chromatography instrumentation, automatic test equipment, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD1555BP 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 AD1555BP belongs to Analog Devices' precision sigma-delta modulator product line, engineered specifically for ultra-low-noise, high-dynamic-range measurement of sub-kHz analog signals in harsh environments.
FAQ
What is the guaranteed minimum dynamic range of AD1555BP at 1 kHz output word rate with PGA gain of 1?
The AD1555BP guarantees a minimum dynamic range of 116.5 dB at 1 kHz output word rate with PGA gain of 1, as explicitly specified in Table Ib of the AD1555/AD1556 datasheet Rev. B. This value is production-tested for the BP grade and reflects performance across the full –55°C to +85°C operating range. The AD1555BP achieves this with 256 kHz modulator sampling and fourth-order noise shaping.
Does AD1555BP require an external antialias filter?
No, AD1555BP does not require an external antialias filter. Its continuous-time analog modulator architecture inherently suppresses aliasing components above the Nyquist frequency of the final output word rate. This eliminates the need for external RC networks or switched-capacitor filters, reducing system complexity and board area while maintaining >116 dB dynamic range in seismic and chromatography applications.
What package type and lead count does AD1555BP use?
AD1555BP uses a 28-lead Plastic Lead Chip Carrier (PLCC) package, designated as P-28A in the Analog Devices ordering guide. It features a square body with J-leads, pin 1 identified by a corner notch, and is qualified for operation from –55°C to +85°C. The package includes dedicated analog and digital ground pins (AGND1/AGND2/AGND3, DGND) to maintain signal integrity.
How is PGA gain configured on AD1555BP?
PGA gain on AD1555BP is configured via hardware control pins CB0 through CB4 (Pins 10–14), which select one of five discrete gains: 1, 2.5, 8.5, 34, or 128. These pins are typically driven directly by the corresponding CB0–CB4 outputs of the AD1556 digital filter IC. Gain selection is latched on power-up or RESET and remains static during conversion unless reconfigured externally.
What is the reference voltage requirement for AD1555BP?
AD1555BP requires a precise 3.000 V ±10 mV reference voltage applied to the REFIN pin (Pin 25). This reference is internally divided to generate the modulator's analog reference. The datasheet recommends the AD780BR as a compatible reference IC. External 22 µF tantalum capacitors must be connected from REFCAP1 (Pin 23) and REFCAP2 (Pin 24) to AGND3 to ensure low-noise operation and meet the guaranteed 116.5 dB dynamic range spec.
AD1555BP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 256k
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- 5V
- Features:
- PGA
- Operating Temperature:
- -55°C ~ 85°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD1555BP FAQ
1.How can I place an order for AD1555BP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1555BP 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 AD1555BP reliable?
The price and inventory of AD1555BP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1555BP is usually 5 days.
3.What payment methods are accepted for AD1555BP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1555BP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1555BP?
AD1555BP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1555BP 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 AD1555BP?
For technical support, including AD1555BP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1555BP requirements.
6.How does Aetrix verify that AD1555BP is sourced from the original manufacturer or authorized distributors?
All AD1555BP 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 AD1555BP meets industry standards.
7.What is the process for return or replacement of AD1555BP?
All AD1555BP units undergo pre-shipment inspection (PSI). If there is an issue with AD1555BP, 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 AD1555BP part is unused and in its original packaging.
Return procedure for AD1555BP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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