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Analog Devices Inc. AD7859ASZ-REEL
- Part No.:
- AD7859ASZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-QFP
- Datasheet:
-
AD7859ASZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 44PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:704
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Product details
Overview
AD7859ASZ-REEL from Analog Devices is a 12-bit, 8-channel, 200 kSPS sampling analog-to-digital converter (ADC) with integrated track-and-hold, on-chip reference, and parallel interface. It operates from a single 3 V to 5.5 V supply, supports unipolar (0 to VREF) and bipolar (±VREF/2) input ranges, and delivers 70 dB SNR at 10 kHz input. It is used in portable instrumentation and battery-powered data acquisition systems requiring high throughput and low power.
For engineers reviewing the AD7859ASZ-REEL datasheet, AD7859ASZ-REEL pinout, AD7859ASZ-REEL application, or AD7859ASZ-REEL equivalent, key selection criteria include its 200 kSPS conversion rate, self/system calibration capability, 44-pin PQFP package, flexible 16-/8-bit parallel I/O, and dual-mode (unipolar/bipolar) analog input support.
Technical Context
The AD7859ASZ-REEL employs a charge redistribution SAR architecture with a 500 ns track-and-hold acquisition time and internal 2.5 V reference (REFIN/REFOUT). Its control register enables software-configurable channel selection (8 single-ended or 4 pseudo-differential), analog mode (unipolar/bipolar), and power-down modes via PMGT1/PMGT0 bits.
Calibration is supported via dedicated CAL pin or software-triggered STCAL bit, covering offset, gain, and DAC calibration. Conversion timing is clock-driven (fCLKIN = 4 MHz), with BUSY signal indicating active conversion or calibration, and CONVST supporting both hardware and software start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - provides 4096 discrete output codes for precision measurement applications. |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to ~90 kHz (Nyquist-limited) without aliasing. |
| Input Channels | 8-channel - configurable as 8 single-ended or 4 pseudo-differential inputs via control register. |
| SNR | 70 dB min @ 10 kHz - ensures high-fidelity digitization of medium-frequency analog signals. |
| Power Dissipation | 15 mW @ 3 V - supports extended operation in battery-powered systems with thermal constraints. |
| Analog Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both ground-referenced and AC-coupled sensor signals. |
| Reference | Internal 2.5 V REFOUT - eliminates need for external reference; REFIN/REFOUT pin allows overdrive or bypass. |
Pinout & Package
AD7859ASZ-REEL is housed in a 44-pin plastic quad flatpack (PQFP) package, RoHS-compliant and tape-and-reel packaged (REEL suffix). Pin 1 is marked by a corner notch; pins are arranged in four 11-pin sides with NC (no-connect) pins at positions 1, 22, and 43.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog input channels | Accepts 8 single-ended or 4 pseudo-differential inputs; all must remain within AGND to AVDD. |
| REFIN/REFOUT | Reference input/output | Provides 2.5 V internal reference; can be overdriven externally or tied to AVDD for rail-to-rail input range. |
| CONVST | Hardware conversion trigger | Rising edge initiates conversion; may be left unconnected and replaced by software CONVST bit in control register. |
| BUSY | Conversion status indicator | Active-high open-drain output signals ongoing conversion or calibration; used for handshaking with host processor. |
| DB0–DB15 | Parallel data bus | 16-bit bidirectional interface; W/B pin selects word (16-bit) or byte (two 8-bit transfers) mode. |
| CS, RD, WR | Control strobes | Standard 3-wire parallel interface enabling register read/write with chip select and direction control. |
| CAL | Calibration initiator | Rising edge triggers full self-calibration; overrides all other operations and resets internal logic. |
| SLEEP | Power-down enable | Combined with PMGT1/PMGT0 bits to enter full or partial power-down; reduces IDD to ≤10 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Self and system calibration | On-chip calibration memory and controller enable automatic correction of offset/gain errors over temperature and time-no external components required. |
| Flexible power management | Three power-down modes (full, partial, auto-after-conversion) reduce typical power from 15 mW to 3.6 µW, extending battery life in portable instruments. |
| Dual analog input modes | Software-selectable unipolar (0 to VREF) or bipolar (±VREF/2) ranges allow direct interfacing with both DC-coupled sensors and AC-coupled signal chains. |
| Configurable channel mapping | Control register bits SGL/DIFF, CHSLT[2:0], and AMODE define input topology (single-ended/differential), channel selection, and AIN(–) source (AGND or AIN8). |
| Integrated reference and capacitors | Internal 2.5 V reference with CREF1 (0.1 µF) and CREF2 (0.01 µF) support stable DAC operation-minimizes BOM count and layout sensitivity. |
Applications
| Battery-Powered Data Loggers | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Continuous acquisition of ECG, temperature, and pressure sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary ADC capturing multi-channel analog biosignals at ≥10 kSPS with low latency and calibrated accuracy. Use Value: 12-bit resolution and on-chip calibration ensure clinical-grade measurement repeatability across operating temperature (–40°C to +85°C). |
Use Scenario: Real-time monitoring of blood oxygen saturation (SpO₂) and pulse waveforms in wearable pulse oximeters. IC Role / Device Role / Timing Role: High-speed sampling ADC synchronizing LED drive timing and photodiode signal capture. Use Value: 200 kSPS throughput and 500 ns track-and-hold enable precise timing alignment between optical excitation and analog response. |
| Industrial Sensor Signal Conditioning | High-Speed Modem Analog Front-End |
|
Use Scenario: Digitizing 4–20 mA loop outputs and thermocouple signals in field-mounted PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC with programmable bipolar input range and system calibration for sensor offset/gain compensation. Use Value: ±0.5 LSB INL (B-grade) and system calibration span (±0.05 × VREF offset, ±0.025 × VREF gain) support traceable sensor calibration per IEC 61000-4 standards. |
Use Scenario: Baseband signal sampling in V.34/V.90 dial-up modems requiring clean 10+ kHz bandwidth digitization. IC Role / Device Role / Timing Role: Low-noise, low-distortion ADC providing 70 dB SNR and –78 dB THD for analog line interface circuits. Use Value: 70 dB SNR and –78 dB THD meet ITU-T V.34 spectral mask requirements for upstream/downstream symbol recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel, parallel-interface ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7859LARSZ-REEL | 100 kSPS max, 5.5 mW @ 3 V, 1.8 MHz CLKIN - lower speed and power than AD7859ASZ-REEL. | Optimized for ultra-low-power, lower-throughput systems (e.g., static sensor nodes); not suitable for 200 kSPS use cases. | Select AD7859LARSZ-REEL only when throughput ≤100 kSPS is acceptable and sub-6 mW power is mandatory. |
| AD7865BSUZ-REEL | 4-channel, 14-bit, 100 kSPS, SPI interface, 2.5 V internal ref - higher resolution but fewer channels and serial interface. | Lacks parallel bus and 8-channel flexibility; requires SPI host firmware changes and offers no W/B or HBEN functionality. | Choose AD7865BSUZ-REEL only if 14-bit resolution outweighs loss of parallel interface and channel count in new designs. |
Compared with AD7859LARSZ-REEL and AD7865BSUZ-REEL, the AD7859ASZ-REEL uniquely balances 200 kSPS throughput, 8-channel flexibility, parallel I/O, and on-chip calibration-making it optimal for legacy or resource-constrained microcontroller-based DAQ where timing determinism and minimal software overhead are critical.
Availability
AD7859ASZ-REEL is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for AD7859ASZ-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 AD7859ASZ-REEL belongs to Analog Devices' legacy high-speed precision ADC product line, designed specifically for portable and low-power data acquisition systems requiring integrated calibration and flexible analog input configuration.
FAQ
What is the maximum sampling rate supported by the AD7859ASZ-REEL?
The AD7859ASZ-REEL supports a maximum sampling rate of 200 kSPS when operated with a 4 MHz master clock (CLKIN). This rate is achieved using its SAR architecture and internal track-and-hold, with conversion time fixed at 4.5 µs (18 × tCLKIN). The AD7859ASZ-REEL datasheet confirms this specification under AVDD = DVDD = 3.0 V to 5.5 V and TA = –40°C to +85°C.
Does the AD7859ASZ-REEL require external reference components?
No, the AD7859ASZ-REEL includes an internal 2.5 V reference accessible via the REFIN/REFOUT pin and requires only two external decoupling capacitors: CREF1 (0.1 µF ceramic) and CREF2 (0.01 µF ceramic), both connected to AGND. The part functions fully with this configuration and does not require an external reference IC unless higher accuracy or temperature stability is needed.
How is channel selection configured on the AD7859ASZ-REEL?
Channel selection on the AD7859ASZ-REEL is controlled by three bits (CHSLT2–CHSLT0) in the write-only control register, allowing selection among eight analog inputs (AIN0–AIN7) in single-ended mode or four differential pairs (e.g., AIN1–AIN2) in pseudo-differential mode. The SGL/DIFF bit determines topology, and AMODE further defines AIN(–) source (AGND or AIN8) in single-ended mode.
Can the AD7859ASZ-REEL operate from a 3.3 V supply?
Yes, the AD7859ASZ-REEL is fully specified for operation from 3.0 V to 5.5 V on both AVDD and DVDD supplies. At 3.3 V, it maintains 200 kSPS throughput, 70 dB SNR, and 15 mW typical power dissipation. Logic thresholds scale accordingly: VINH = 2.1 V min and VINL = 0.6 V max, ensuring compatibility with standard 3.3 V CMOS interfaces.
What calibration modes does the AD7859ASZ-REEL support?
The AD7859ASZ-REEL supports both self-calibration (using internal DAC and calibration memory) and system calibration (correcting external front-end errors). Calibration is initiated either by a rising edge on the CAL pin or via the STCAL bit in the control register. System calibration requires external voltage sources applied to AIN(+) and AIN(–) within defined spans (±0.05 × VREF for offset, ±0.025 × VREF for gain).
AD7859ASZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-QFP
- 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-MQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7859ASZ-REEL FAQ
1.How can I place an order for AD7859ASZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7859ASZ-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 AD7859ASZ-REEL reliable?
The price and inventory of AD7859ASZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7859ASZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7859ASZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7859ASZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7859ASZ-REEL?
AD7859ASZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7859ASZ-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 AD7859ASZ-REEL?
For technical support, including AD7859ASZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7859ASZ-REEL requirements.
6.How does Aetrix verify that AD7859ASZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7859ASZ-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 AD7859ASZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7859ASZ-REEL?
All AD7859ASZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7859ASZ-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 AD7859ASZ-REEL part is unused and in its original packaging.
Return procedure for AD7859ASZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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