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Analog Devices Inc. AD7859AP-REEL
- Part No.:
- AD7859AP-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AD7859AP-REEL.pdf
- Description:
- IC ADC 12BIT 8CH LP 44-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
AD7859AP-REEL from Analog Devices is a 12-bit, 8-channel, 200 kSPS sampling analog-to-digital converter (ADC) with integrated track-and-hold, self/system calibration, and flexible parallel interface. It operates from a single 3 V to 5.5 V supply, delivers 70 dB SNR at 10 kHz input, supports unipolar (0 to VREF) and bipolar (±VREF/2) input ranges, and targets precision data acquisition in battery-powered instrumentation.
For engineers reviewing the AD7859AP-REEL datasheet, AD7859AP-REEL pinout, AD7859AP-REEL application, or AD7859AP-REEL equivalent, this page provides verified technical context, calibrated performance metrics, PQFP-44 package mapping, real-world use scenarios, and validated alternative options for embedded measurement systems requiring low-power, multi-channel ADCs with on-chip calibration.
Technical Context
The AD7859AP-REEL employs a charge redistribution SAR architecture with integrated track-and-hold, enabling 500 ns acquisition time and 4.5 µs conversion time at 4 MHz master clock. Its dual-reference path supports external 2.5 V reference or internal reference output (REFOUT), while calibration memory stores offset/gain correction coefficients for both self- and system-level calibration sequences.
It features a 16-bit parallel/8-bit byte-configurable interface (W/B pin controlled), programmable channel selection (SGL/DIFF, CHSLT[2:0]), and three power-down modes managed via PMGT[1:0] bits and SLEEP pin - delivering 1.3 mW at 10 kSPS (3 V) and 3.6 µW in full power-down mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist bandwidth without aliasing. |
| SNR + Distortion | 70 dB min @ 10 kHz - ensures ≥11.3 effective bits for high-fidelity signal digitization in noisy environments. |
| Integral Nonlinearity | ±1 LSB max - maintains end-point linearity critical for closed-loop control and sensor linearization. |
| Power Dissipation | 15 mW typ @ 3 V normal operation - balances speed and efficiency for portable medical and PDA applications. |
| Analog Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - supports direct interfacing with transducer bridges and op-amp outputs. |
| Reference Voltage | 2.5 V nominal REFOUT - provides stable, low-drift reference source eliminating need for external precision reference IC. |
Pinout & Package
The AD7859AP-REEL is housed in a 44-pin plastic quad flatpack (PQFP) package (package code P-44A), RoHS-compliant, with 0.8 mm lead pitch and exposed thermal pad (not electrically connected). Pin 1 is marked by a corner notch or dot; all NC pins must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog input channels | Eight single-ended or four pseudo-differential inputs; configurable via control register; rail-to-rail input voltage range (0 V to AVDD). |
| REFIN/REFOUT | Reference I/O | 2.5 V internal reference output; accepts external reference up to AVDD; requires CREF1 (0.1 µF) and CREF2 (0.01 µF) decoupling. |
| CONVST | Conversion start trigger | Rising-edge sensitive; initiates track-to-hold transition and SAR conversion sequence; can be software-controlled via CONVST bit. |
| DB0–DB15 | Parallel data bus | 16-bit bidirectional interface; W/B pin selects word (16-bit) or byte (two 8-bit) transfer mode; outputs straight binary (unipolar) or 2's complement (bipolar). |
| RD / WR / CS | Control strobes | Standard 3-wire parallel interface; RD reads ADC output/status registers; WR writes control/calibration registers; CS enables device access. |
| SLEEP / CAL | Power & calibration control | SLEEP + PMGT[1:0] bits enable three power-down states; CAL rising edge triggers self- or system calibration independent of main control logic. |
Key Features
| Feature | Design Value |
|---|---|
| Self and system calibration | On-chip calibration memory stores offset/gain coefficients; eliminates manual trimming and compensates for drift over temperature and time. |
| Flexible power management | Three power-down modes (full/partial/external-clock-off) reduce current to 5 µA max; enables 1.3 mW operation at 10 kSPS for extended battery life. |
| Pseudo-differential input architecture | Supports both single-ended (AINx vs AGND) and pseudo-differential (AINx vs AINy) configurations; improves common-mode noise rejection without external instrumentation amps. |
| Configurable analog input range | AMODE bit selects unipolar (0 to VREF) or bipolar (±VREF/2); allows seamless integration with sensors spanning positive/negative output ranges. |
| Integrated 2.5 V reference | REFOUT provides stable, low-tempco (20 ppm/°C) reference; eliminates external reference IC and associated layout complexity in space-constrained designs. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, pulse oximetry, or temperature sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary ADC capturing 8 analog sensor channels with on-the-fly calibration to maintain accuracy across varying battery voltage and ambient temperature. Use Value: 200 kSPS throughput and 70 dB SNR ensure clean waveform reconstruction; 15 mW power enables >8-hour runtime on two AA cells. |
Use Scenario: Long-term environmental monitoring using thermistors, humidity sensors, and gas detectors deployed in remote field locations. IC Role / Device Role / Timing Role: Multi-channel front-end digitizer with automatic power-down between samples to minimize average current draw. Use Value: 1.3 mW at 10 kSPS and 3.6 µW sleep mode extend battery life to >1 year; self-calibration maintains ±1 LSB INL without field recalibration. |
| Industrial Control Panel Interfaces | Pen-Based Computing Systems |
Use Scenario: Analog input module for PLCs or HMI panels acquiring process variables (pressure, flow, level) from 4–20 mA transmitters. IC Role / Device Role / Timing Role: Precision ADC with bipolar input support and system calibration capability to compensate for sensor/loop gain drift. Use Value: ±VREF/2 input range and system calibration span (±0.05 × VREF offset, ±0.025 × VREF gain) enable accurate 4–20 mA loop digitization with <0.1% total error. |
Use Scenario: Digitizing stylus position and pressure signals in pen computers and signature capture tablets. IC Role / Device Role / Timing Role: High-speed, low-latency ADC synchronizing with touch controller timing to avoid jitter in handwriting capture. Use Value: 500 ns track/hold acquisition and 4.5 µs conversion time support >200 Hz sampling of stylus motion; 44-pin PQFP fits compact tablet PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7859AS | Same die, PQFP-44 package without tape-and-reel; identical electrical specs and pinout. | No reel packaging - suited for prototyping or low-volume hand-soldered assemblies. | Select AD7859AS for evaluation or small-batch builds where reel logistics are unnecessary. |
| AD7859LAS3 | Low-power variant (AD7859L): 100 kSPS max, 5.5 mW @ 3 V, 1.8 MHz CLKIN; same pinout and register map. | Lower throughput and reduced dynamic performance (71 dB SNR) - optimized for ultra-low-power, lower-bandwidth sensing. | Choose AD7859LAS3 when system sampling rate ≤100 kSPS and sub-5 mW power is mandatory; not drop-in for AD7859AP-REEL's 200 kSPS requirement. |
Compared with AD7859AP-REEL, AD7859AS offers identical performance in non-reel format for development, while AD7859LAS3 trades speed and SNR for halved power consumption - making it suitable only where 100 kSPS suffices and energy budget is tighter than timing margin.
Availability
AD7859AP-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial control panel interfaces requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for AD7859AP-REEL 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 Wilmington, MA.
The AD7859 product line was designed for precision, low-power, multi-channel data acquisition in portable and embedded systems - emphasizing integrated calibration, flexible power management, and robust analog front-end architecture.
FAQ
What is the maximum sampling rate supported by the AD7859AP-REEL?
The AD7859AP-REEL supports a maximum sampling rate of 200 kSPS, achieved with a 4 MHz master clock (CLKIN) and 4.5 µs conversion time. This rate is guaranteed across the full operating temperature range (–40°C to +85°C) and applies specifically to the AD7859 variant - not the lower-speed AD7859L. The AD7859AP-REEL maintains this throughput while delivering 70 dB SNR at 10 kHz input frequency.
Does the AD7859AP-REEL require an external reference voltage?
No, the AD7859AP-REEL does not require an external reference voltage because it integrates a 2.5 V reference with 20 ppm/°C tempco, available at the REFIN/REFOUT pin. However, it supports overdriving this pin with an external reference up to AVDD, enabling higher-precision or customized reference schemes. When using the internal reference, CREF1 (0.1 µF) and CREF2 (0.01 µF) capacitors must be connected to AGND per the AD7859AP-REEL datasheet layout guidelines.
How does the AD7859AP-REEL handle calibration - self or system?
The AD7859AP-REEL supports both self-calibration (correcting internal DAC and comparator offsets) and system calibration (compensating for external front-end gain/offset errors) via dedicated CAL pin and CALMD bit in the control register. Full self-calibration takes ~31.25 ms at 4 MHz CLKIN; system calibration sequences are selectable through CALSLT[1:0] bits. All calibration coefficients are stored in on-chip memory and applied automatically during conversion, ensuring AD7859AP-REEL maintains ±1 LSB INL over temperature and time.
What package type is used for the AD7859AP-REEL?
The AD7859AP-REEL uses a 44-pin plastic quad flatpack (PQFP) package, designated P-44A in Analog Devices' ordering guide. It features gull-wing leads, 0.8 mm pitch, and a thermal pad (non-connected). This package is distinct from the PLCC variant (AD7859AS) and is optimized for automated SMT assembly and thermal performance in compact PCB layouts where the AD7859AP-REEL is deployed.
Can the AD7859AP-REEL operate from a 3.3 V supply?
Yes, the AD7859AP-REEL is fully specified for operation from 3.0 V to 5.5 V supplies on both AVDD and DVDD rails. At 3.3 V, it delivers 15 mW typical power dissipation in normal mode, 1.3 mW at 10 kSPS, and retains full 12-bit performance including ±1 LSB integral nonlinearity and 70 dB SNR. Logic thresholds scale accordingly: VINH = 2.1 V min and VINL = 0.6 V max at 3.0–3.6 V, ensuring reliable interface with 3.3 V microcontrollers and FPGAs.
AD7859AP-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7859AP-REEL FAQ
1.How can I place an order for AD7859AP-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7859AP-REEL 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 AD7859AP-REEL reliable?
The price and inventory of AD7859AP-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7859AP-REEL is usually 5 days.
3.What payment methods are accepted for AD7859AP-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7859AP-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7859AP-REEL?
AD7859AP-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7859AP-REEL 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 AD7859AP-REEL?
For technical support, including AD7859AP-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7859AP-REEL requirements.
6.How does Aetrix verify that AD7859AP-REEL is sourced from the original manufacturer or authorized distributors?
All AD7859AP-REEL 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 AD7859AP-REEL meets industry standards.
7.What is the process for return or replacement of AD7859AP-REEL?
All AD7859AP-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7859AP-REEL, 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 AD7859AP-REEL part is unused and in its original packaging.
Return procedure for AD7859AP-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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