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Analog Devices Inc. AD7859APZ-REEL
- Part No.:
- AD7859APZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AD7859APZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
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Product details
Overview
AD7859APZ-REEL from Analog Devices is a 12-bit, 8-channel, 200 kSPS sampling 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 battery-powered instrumentation requiring high accuracy and low power.
For engineers reviewing the AD7859APZ-REEL datasheet, AD7859APZ-REEL pinout, AD7859APZ-REEL application, or AD7859APZ-REEL equivalent, key selection factors include its 44-pin PQFP package, 16-bit/8-bit parallel I/O, 500 ns track/hold acquisition time, ±1 LSB integral nonlinearity, and support for system-level offset/gain calibration - all critical for portable medical devices and industrial data acquisition.
Technical Context
The AD7859APZ-REEL employs a charge redistribution SAR architecture with on-chip 2.5 V reference buffer and calibration memory. Its pseudo-differential input mux supports eight single-ended or four differential channels, selectable via control register bits SGL/DIFF and CHSLT[2:0].
Conversion timing is clock-driven (tCONVERT = 18 × tCLKIN), with BUSY signal assertion and automatic power-down modes controlled by PMGT[1:0] bits and SLEEP pin. Calibration is initiated via CAL pin or software (STCAL bit), supporting full self-calibration (6 ms typ @ 4 MHz) and system offset/gain adjustment within defined voltage spans.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with guaranteed no missing codes |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist bandwidth |
| SNR + Distortion | 70 dB min @ 10 kHz - ensures ≥11.3 effective bits for precision sensor digitization |
| Integral Nonlinearity | ±1 LSB max - maintains monotonicity and linearity across full temperature range (–40°C to +85°C) |
| Track/Hold Acquisition | 500 ns - allows accurate sampling of fast transients without external hold circuitry |
| Supply Range | 3.0 V to 5.5 V - supports direct interfacing with 3.3 V or 5 V logic and mixed-voltage systems |
| Power Dissipation | 15 mW typ @ 3 V - enables extended operation in handheld instruments with limited thermal budget |
Pinout & Package
AD7859APZ-REEL is housed in a 44-pin plastic quad flatpack (PQFP) package with 0.8 mm lead pitch and exposed thermal pad. Pin 1 is marked by a corner notch; all NC pins must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog Input Channels | Selectable as 8 single-ended (vs AGND) or 4 pseudo-differential pairs; input range 0 to VREF (unipolar) or ±VREF/2 (bipolar) |
| REFIN/REFOUT | Reference I/O | 2.5 V nominal internal reference; can be overdriven externally or tied to AVDD (requires CREF1/CREF2 decoupling) |
| CONVST | Convert Start | Rising-edge-triggered; initiates track-to-hold transition and conversion sequence |
| BUSY | Status Output | Active-high open-drain signal indicating ongoing conversion or calibration |
| RD, WR, CS, W/B | Parallel Interface Control | Enable 16-bit word or 8-bit byte transfers; RD/WR are active-low, CS selects device, W/B configures data width |
| DB0–DB15 | Data Bus | Three-state I/O; outputs straight binary (unipolar) or 2's complement (bipolar); DB8/HBEN dual-function in byte mode |
| CAL | Calibration Trigger | Rising edge forces immediate self-calibration; overrides all ongoing operations |
| SLEEP | Power-Down Control | Combined with PMGT[1:0] bits to select full or partial power-down (down to 5 µA) |
Key Features
| Feature | Design Value |
|---|---|
| Self and System Calibration | On-chip calibration memory and controller enable field recalibration of offset (±0.05×VREF span) and gain (±2.5% VREF span) errors |
| Flexible Power Management | Four power-down states: normal (15 mW), auto-sleep post-conversion (1.3 mW @ 10 kSPS), partial (400 µA), full (5 µA) |
| Pseudo-Differential Input Architecture | Configurable 8-channel mux supports both single-ended and differential acquisition without external op-amps or level-shifting |
| Wide Reference Compatibility | Accepts external references from 1.2 V to AVDD; internal 2.5 V reference stable to 20 ppm/°C |
| Robust Digital Interface | 16-bit parallel bus with byte-mode option (W/B), programmable read/write addressing, and status register visibility |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring 8 biopotential channels at 200 kSPS with on-the-fly calibration. Use Value: 500 ns track/hold acquisition and ±1 LSB INL ensure diagnostic-grade fidelity; 1.3 mW @ 10 kSPS extends runtime without compromising signal integrity. |
Use Scenario: Environmental sensor node recording temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Low-power multiplexed ADC performing scheduled conversions and auto-calibrating before each measurement burst. Use Value: Full power-down mode (5 µA) eliminates quiescent drain between samples; internal 2.5 V reference removes need for external precision reference IC. |
| Industrial Process Monitoring | Pen-Based Computing Interfaces |
Use Scenario: PLC analog input module conditioning 4–20 mA current loops and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: High-isolation (–80 dB channel-to-channel) ADC handling multiple sensor types with system-level calibration compensation. Use Value: Bipolar input range (±VREF/2) and system calibration support enable direct thermocouple cold-junction compensation without external amplifiers. |
Use Scenario: Digitizing stylus position and pressure in ruggedized tablet PCs with resistive touch overlay. IC Role / Device Role / Timing Role: Fast-acquisition ADC capturing pen movement at >100 Hz with minimal latency and jitter. Use Value: 200 kSPS throughput and 70 dB SNR preserve fine handwriting detail; 44-pin PQFP footprint simplifies layout in space-constrained tablet designs. |
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, 44-pin SOIC package (S-44) - larger footprint, higher θJA (120°C/W vs 95°C/W) | Preferred where hand-soldering or socket-based prototyping is required | Select AD7859AS only if PQFP reflow capability is unavailable; identical electrical specs and calibration behavior |
| AD7859BS | Improved linearity: ±0.5 LSB INL (vs ±1 LSB), same speed/power - B-grade screening for tighter performance | Required in metrology-grade test equipment demanding sub-LSB accuracy stability | Choose AD7859BS when system-level calibration cannot compensate for worst-case INL; otherwise AD7859APZ-REEL offers optimal cost/performance |
Compared with AD7859AS and AD7859BS, the AD7859APZ-REEL provides the best thermal performance in compact layouts due to its PQFP package, while maintaining full functional equivalence with the AS variant and offering a cost-effective alternative to the higher-grade BS version where ±1 LSB INL is sufficient.
Availability
AD7859APZ-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial process monitoring requiring stable component supply across long production lifecycles.
Supply support for AD7859APZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD7859 family was designed specifically for portable and low-power industrial data acquisition systems requiring integrated calibration, wide supply range, and flexible parallel interfacing - bridging legacy microcontroller buses with modern precision sensing needs.
FAQ
What is the maximum clock frequency supported by the AD7859APZ-REEL?
The AD7859APZ-REEL supports a master clock (CLKIN) up to 4 MHz, which determines conversion time (tCONVERT = 18 × tCLKIN). At 4 MHz, conversion completes in 4.5 µs, enabling the full 200 kSPS throughput. Operation above 4 MHz is not characterized and may violate timing margins or degrade AC performance.
Does the AD7859APZ-REEL require external reference components?
Yes, the AD7859APZ-REEL requires two external capacitors: a 0.1 µF multilayer ceramic capacitor (CREF1) between CREF1 and AGND, and a 0.01 µF ceramic disc capacitor (CREF2) between CREF2 and AGND. These stabilize the internal reference and DAC charge redistribution network; omission causes gain drift and increased noise.
How does the AD7859APZ-REEL handle bipolar input signals?
The AD7859APZ-REEL supports bipolar inputs (±VREF/2) when AMODE = 1 and SGL/DIFF = 0. In this mode, AIN(–) must be biased to +VREF/2, and AIN(+) swings from 0 V to +VREF. The output uses 2's complement coding, with midscale (0x800) representing zero; bipolar zero error is specified at ±1 LSB typical.
Can the AD7859APZ-REEL perform system calibration without external hardware?
Yes - system calibration (offset and gain) is performed entirely within the AD7859APZ-REEL using its internal DAC and calibration registers. The user applies known reference voltages to AIN(+) and AIN(–), then triggers calibration via the CAL pin or STCAL bit. No external DAC or precision voltage sources are needed beyond the applied test signals.
What is the purpose of the W/B pin on the AD7859APZ-REEL?
The W/B (Word/Byte) pin configures the AD7859APZ-REEL's parallel interface: when high, DB0–DB15 transfer 16-bit words; when low, DB0–DB7 transfer bytes and DB8 functions as HBEN (High Byte Enable). This allows seamless integration with both 16-bit microcontrollers and 8-bit systems without external glue logic.
AD7859APZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4, 8
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3V ~ 5.5V
- Voltage - Supply, Digital:
- 3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7859APZ-REEL FAQ
1.How can I place an order for AD7859APZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7859APZ-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 AD7859APZ-REEL reliable?
The price and inventory of AD7859APZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7859APZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7859APZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7859APZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7859APZ-REEL?
AD7859APZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7859APZ-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 AD7859APZ-REEL?
For technical support, including AD7859APZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7859APZ-REEL requirements.
6.How does Aetrix verify that AD7859APZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7859APZ-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 AD7859APZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7859APZ-REEL?
All AD7859APZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7859APZ-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 AD7859APZ-REEL part is unused and in its original packaging.
Return procedure for AD7859APZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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