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Analog Devices Inc. AD7725BS
- Part No.:
- AD7725BS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-QFP
- Datasheet:
-
AD7725BS.pdf
- Description:
- IC ADC 16BIT PROG 44-MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:20,105
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Product details
Overview
AD7725BS from Analog Devices is a 16-bit, 900 kSPS sigma-delta analog-to-digital converter with integrated programmable postprocessor for real-time signal conditioning. It delivers 83 dB SNR (unipolar mode), supports ±4/5 VREF2 differential or 0–8/5 VREF2 single-ended input ranges, and operates with 5 V AVDD/DVDD supplies across –40°C to +85°C in a 44-lead MQFP package - used in radar front-ends requiring high-resolution digitization of wideband IF signals.
For engineers reviewing the AD7725BS datasheet, AD7725BS pinout, AD7725BS application, or AD7725BS equivalent, key selection considerations include its 108-tap FIR/IIR programmability, 130 million MAC/sec postprocessor throughput, internal 2.5 V reference with ±3 mV offset, configurable decimation (fCLKIN/4096 to fCLKIN/16), and dual serial/parallel interface support for embedded DSP integration.
Technical Context
The AD7725BS implements a third-order sigma-delta modulator followed by three cascaded FIR filters and a fully user-programmable postprocessor. Its digital signal path supports up to 8th-order polynomial conditioning, coefficient precision of 24 bits, and arithmetic precision of 30 bits.
It accepts master clock inputs up to 14.4 MHz, offers selectable clock formats (rising/falling edge sampling via EFMT/CFMT), and provides synchronous frame control via FSI/FSO. Configuration is bootable from DSP, external EPROM, or internal ROM default filter - all validated for operation at full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit output word length with guaranteed monotonicity and ±2 LSB INL. |
| Max Sampling Rate | 900 kSPS output word rate with fCLKIN up to 14.4 MHz and decimation factor selectable from 2 to 256. |
| SNR (Unipolar) | 83 dB typical at 0.5× output data rate - enables high-fidelity digitization of low-noise sensor or IF signals. |
| Analog Input Range | ±4/5 VREF2 (bipolar) or 0–8/5 VREF2 (unipolar); supports both differential and single-ended configurations. |
| Reference | On-chip 2.5 V reference (2.39–2.69 V, 60 ppm/°C drift) with REF1/REF2 pins for internal or external reference routing. |
| Power Supply | AVDD/DVDD = 4.75–5.25 V; AIDD = 33 mA (HALF_PWR = high), DIDD = 90 mA (filter active, fCLKIN = 9.6 MHz). |
| Operating Temp | –40°C to +85°C industrial temperature range, qualified per ordering guide for AD7725BS variant. |
Pinout & Package
AD7725BS is housed in a 44-lead Metric Quad Flatpack (MQFP), S-44-2 package with 0.8 mm lead pitch and exposed thermal pad. Pin 1 identifier located at top-left corner; body dimensions 10 mm × 10 mm × 1.7 mm (max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN(+), VIN(–) | Differential analog input terminals | Accepts ±4/5 VREF2 bipolar or 0–8/5 VREF2 unipolar input; high-impedance sampling node with 2 pF capacitance. |
| REF1, REF2 | Reference voltage interface | REF1 outputs buffered 2.5 V reference; REF2 accepts internal reference or external 1.2–3.15 V source for modulator biasing. |
| CLKIN, XTAL, XTALOFF | Master clock interface | Supports crystal oscillator (XTAL/CLKIN) or external clock (CLKIN only, XTALOFF = high); max 14.4 MHz input. |
| S/P, RS, RD/WR, DB0–DB15 | Parallel interface control & data bus | 8-/16-bit bidirectional data transfer; RS selects instruction/data register; RD/WR controls read/write direction with CS enable. |
| SCO, SDI, SDO, FSI, FSO, SOE, SCR, EFMT, CFMT | Serial interface signals | Configurable SPI-like interface with frame sync, clock rate select (SCR), and dual clock format (EFMT/CFMT) for edge-aligned sampling. |
| SYNC, STBY, INIT, RESETCFG | System control logic inputs | SYNC resets digital filter sequencer for multi-device synchronization; STBY enables low-power standby; INIT gates conversion start; RESETCFG clears configuration errors. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable postprocessor | 130 million MAC/sec throughput with 24-bit coefficient and 30-bit arithmetic precision for real-time FIR/IIR filtering. |
| Filter flexibility | Supports any characteristic up to 108 taps; includes internal default 106-tap ROM filter for immediate evaluation. |
| Input range configurability | UNI pin selects bipolar (±4/5 VREF2) or unipolar (0–8/5 VREF2) operation without external component changes. |
| Reference architecture | Internal 2.5 V reference with ±3 mV offset between REF1/REF2; external reference supported down to 1.2 V with 8 kΩ input impedance. |
| Interface versatility | Dual-mode operation: parallel (16-bit DB0–DB15) or serial (SPI-compatible with FSI/FSO framing) with boot-from-ROM capability. |
Applications
| Radar Signal Processing | Sonar Data Acquisition |
|---|---|
Use Scenario: Digitizing intermediate frequency (IF) outputs from radar receiver chains operating at 100–350 kHz bandwidth. IC Role / Device Role / Timing Role: Primary ADC with on-chip programmable filtering replaces external DSP pre-processing stages for pulse compression and clutter rejection. Use Value: 83 dB SNR and 108-tap FIR allow direct digitization of weak return signals without analog gain staging, reducing system noise floor and component count. | Use Scenario: High-resolution capture of underwater acoustic returns in towed array sonar systems with dynamic range >100 dB. IC Role / Device Role / Timing Role: Sigma-delta ADC with configurable decimation and internal reference ensures stable performance across temperature-varying marine environments. Use Value: –40°C to +85°C rating and 60 ppm/°C reference drift enable calibration-free operation in deep-ocean deployments with minimal thermal management. |
| Medical Communications Interface | Auxiliary Car Functions |
Use Scenario: Isolated analog telemetry channel in implantable or portable medical devices transmitting biosensor waveforms over RF links. IC Role / Device Role / Timing Role: Low-power ADC with HALF_PWR mode and STBY control minimizes average current draw during intermittent sensing bursts. Use Value: HALF_PWR = high reduces analog current to ~16.5 mA while maintaining 900 kSPS output rate - extends battery life in Class III medical devices. | Use Scenario: Engine control unit (ECU) subsystem monitoring auxiliary sensors (e.g., cabin pressure, HVAC feedback, seat occupancy). IC Role / Device Role / Timing Role: General-purpose high-accuracy ADC interfacing with microcontroller via parallel bus for deterministic latency-critical reads. Use Value: Parallel interface with tCS = 50 ns pulse width and tRD = 30 ns access time enables sub-microsecond sampling response in automotive real-time control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution programmable ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7722BRU | 16-bit, 1 MSPS sigma-delta ADC with fixed 5th-order sinc filter; no programmable postprocessor; 28-lead TSSOP package. | Lacks FIR/IIR programmability and MAC engine; suited for simpler oversampling applications without custom filtering. | Select when deterministic low-latency filtering suffices and board space constraints favor smaller package. |
| ADS1258IPWR | 24-bit, 125 kSPS delta-sigma ADC with PGA, internal oscillator, and SPI interface; no postprocessor; 28-lead TSSOP. | Higher resolution but lower speed; integrated PGA simplifies sensor interfacing but eliminates programmable signal conditioning. | Select for precision DC/low-frequency measurements where resolution > speed and filtering flexibility. |
Compared with AD7725BS, AD7722BRU offers higher base sampling rate but no programmable filtering, while ADS1258IPWR provides greater resolution and integrated gain but lacks real-time MAC processing - making AD7725BS uniquely suited for wideband, algorithm-driven digitization where adaptive filtering is required.
Availability
AD7725BS is available at Aetrix Electronics and suitable for radar signal processing, sonar data acquisition, medical communications interfaces, and auxiliary car functions requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7725BS 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 semiconductor company headquartered in Norwood, MA, specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The AD7725BS belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for applications demanding real-time, user-defined digital filtering of wideband analog signals in harsh industrial and defense environments.
FAQ
What is the maximum clock frequency supported by the AD7725BS?
The AD7725BS supports a maximum CLKIN frequency of 14.4 MHz when HALF_PWR is set low. With HALF_PWR high, the maximum clock frequency is reduced to 9.6 MHz to halve analog current consumption. Both modes maintain full 16-bit resolution and 900 kSPS output word rate capability. The AD7725BS timing specifications confirm tCLK minimum of 0.07 µs (14.4 MHz) under AVDD = 5 V ±5% conditions.
Does the AD7725BS include an internal voltage reference?
Yes, the AD7725BS integrates a precision 2.5 V bandgap voltage reference with output voltage specified from 2.39 V to 2.69 V and temperature drift of 60 ppm/°C. REF1 provides the buffered reference output, while REF2 serves as the modulator reference input. An external reference between 1.2 V and 3.15 V can also be applied to REF2 when internal reference is disabled by grounding REF1.
How does the AD7725BS handle configuration loading at power-up?
The AD7725BS supports three boot modes selected by SMODE0/SMODE1 pins: DSP mode (configuration loaded from host processor), EPROM mode (loaded from external serial EPROM), or BFR mode (boot from internal ROM default filter). A full power cycle is required to change boot mode. The AD7725BS uses SOE/CS and CFGEND pins to indicate configuration readiness and completion status during startup.
Can the AD7725BS operate with both single-ended and differential analog inputs?
Yes, the AD7725BS supports both configurations. In bipolar mode (UNI = low), it accepts differential inputs across VIN(+) and VIN(–) with full-scale span of ±4/5 VREF2, or single-ended inputs referenced to AGND with same span. In unipolar mode (UNI = high), it accepts single-ended inputs from 0 V to 8/5 VREF2. Input sampling capacitance is 2 pF in all configurations.
What is the purpose of the SYNC pin on the AD7725BS?
The SYNC pin on the AD7725BS provides hardware synchronization across multiple devices sharing a common master clock. When SYNC is asserted high, it resets the digital filter sequencer counter and postprocessor core to ensure simultaneous sampling and output register update. This function is essential for coherent multi-channel acquisition in radar or sonar beamforming systems. The AD7725BS requires SYNC pulses to be non-continuous to avoid disrupting filter convergence.
AD7725BS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 900k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, Parallel
- Configuration:
- 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:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-MQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7725BS FAQ
1.How can I place an order for AD7725BS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7725BS 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 AD7725BS reliable?
The price and inventory of AD7725BS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7725BS is usually 5 days.
3.What payment methods are accepted for AD7725BS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7725BS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7725BS?
AD7725BS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7725BS 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 AD7725BS?
For technical support, including AD7725BS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7725BS requirements.
6.How does Aetrix verify that AD7725BS is sourced from the original manufacturer or authorized distributors?
All AD7725BS 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 AD7725BS meets industry standards.
7.What is the process for return or replacement of AD7725BS?
All AD7725BS units undergo pre-shipment inspection (PSI). If there is an issue with AD7725BS, 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 AD7725BS part is unused and in its original packaging.
Return procedure for AD7725BS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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