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Analog Devices Inc. AD7856KR-REEL7
- Part No.:
- AD7856KR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7856KR-REEL7.pdf
- Description:
- IC ADC 14BIT 8CH 5V 24-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:800
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Product details
Overview
AD7856KR-REEL7 from Analog Devices is a 14-bit, 285 kSPS sampling ADC operating from a single 5 V supply, featuring eight single-ended or four pseudo-differential analog inputs, on-chip 4.096 V reference, and SPI/QSPI/μP-compatible serial interface. It delivers ±2 LSB integral nonlinearity, 78 dB SNR at 10 kHz input, and supports system calibration for precision instrumentation.
For engineers reviewing the AD7856KR-REEL7 datasheet, AD7856KR-REEL7 pinout, AD7856KR-REEL7 application, or AD7856KR-REEL7 equivalent, this page provides verified specifications, package mapping to 24-lead SOIC, real-world timing behavior (5.25 µs max conversion time), power-down modes (2.5 mW typ), and calibrated DC accuracy across 0°C to +105°C operation.
Technical Context
The AD7856KR-REEL7 implements a successive approximation register (SAR) architecture with integrated track-and-hold, charge redistribution DAC, and self-calibration memory. Its K-grade rating specifies operation from 0°C to +105°C with 4 MHz master clock support and 102 kSPS typical throughput in standard mode.
It uses a flexible 3-wire serial interface (SYNC/SCLK/DIN/DOUT) supporting SPI Mode 2, with configurable read/write register addressing via control bits RDSLT1/RDSLT0 and CALSLT1/CALSLT0. Calibration is initiated via dedicated CAL pin or software-controlled STCAL bit in the control register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - Delivers 16,384 discrete output levels for high-fidelity signal digitization. |
| Sampling Rate | 285 kSPS maximum - Enables capture of signals up to ~10 MHz full-power bandwidth with adequate Nyquist margin. |
| Integral Nonlinearity | ±2 LSB max - Ensures monotonicity and guarantees no missing codes through 13 bits. |
| Signal-to-Noise + Distortion | 78 dB min at fIN = 10 kHz - Supports dynamic range >12.6 ENOB for precision measurement applications. |
| Power Dissipation | 60 mW typ in normal mode; 2.5 mW typ in auto power-down - Reduces thermal load and extends battery life in portable systems. |
| Reference Voltage | 4.096 V internal reference (REFIN/REFOUT pin) - Provides stable, factory-trimmed scaling without external components. |
| Input Configuration | Eight single-ended or four pseudo-differential channels - Allows flexible sensor interfacing while maintaining channel isolation >90 dB. |
Pinout & Package
AD7856KR-REEL7 is housed in a 24-lead small outline integrated circuit (SOIC) package, 0.3 inch wide, RoHS-compliant, tape-and-reel format (REEL7). Pin layout matches industry-standard 24-pin SOIC footprint with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start Input | Edge-triggered command initiating track-to-hold transition and conversion sequence; tied high if unused. |
| 2 BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion or calibration; used for handshaking in polled systems. |
| 3 SLEEP | Power Management Input | Logic low enables full or partial power-down; retains calibration data and reference state during sleep. |
| 4 REFIN/REFOUT | Reference I/O | Provides 4.096 V internal reference; accepts external references from 1.2 V to AVDD for flexible scaling. |
| 5 AVDD, 6 AGND | Analog Supply & Ground | Separate analog domain supply (5.0 V ±5%) and ground minimize noise coupling into sensitive analog front-end. |
| 7 CREF1, 8 CREF2 | Reference Decoupling Terminals | Support external 0.1 µF + 470 nF (CREF1) and 0.01 µF (CREF2) ceramic capacitors to stabilize internal DAC charge redistribution. |
| 9–16 AIN1–AIN8 | Analog Input Channels | Configurable as eight single-ended (vs. AGND) or four pseudo-differential pairs; channel selection controlled by CH2–CH0 bits. |
| 17 CAL | Calibration Trigger | Falling edge resets logic; rising edge initiates self- or system calibration; supports automatic power-up calibration via 10 nF capacitor. |
| 18 DVDD, 19 DGND | Digital Supply & Ground | Isolated 5.0 V ±5% digital rail prevents digital switching noise from modulating analog conversion accuracy. |
| 20 DOUT, 21 DIN | Serial Data I/O | 16-bit serial interface supports bidirectional communication; DIN functions as input or I/O depending on 2/3 MODE bit setting. |
| 22 CLKIN | Master Clock Input | Accepts 4 MHz clock for K-grade operation; defines conversion time (5.25 µs max), calibration duration, and timing margins. |
| 23 SCLK, 24 SYNC | Serial Interface Clock & Frame Sync | SCLK clocks data transfer; SYNC frames each 16-bit word-enables reliable communication with μP, SPI, or QSPI controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates need for dual ±5 V or separate analog/digital rails-reduces BOM count and PCB complexity. |
| Automatic power-up calibration | Ensures ±2 LSB INL and offset match ≤±3 LSB without host intervention-critical for unattended field instruments. |
| Flexible power-down modes | Two software-controllable states (PMGT1/PMGT0): full shutdown (30 µA typ) or partial retention (400 µA typ) for adaptive energy management. |
| Pseudo-differential input architecture | Rejects common-mode noise on sensor leads while preserving 14-bit resolution-ideal for RTD, thermocouple, and bridge measurements. |
| Versatile serial interface | Hardware-compatible with SPI, QSPI, and 8051 protocols-enables drop-in integration with existing microcontroller firmware stacks. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, pulse oximetry, or blood glucose sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary analog front-end digitizer performing synchronized multi-channel sampling at ≤100 kSPS with calibrated DC accuracy. Use Value: On-chip 4.096 V reference and auto-calibration maintain ±2 LSB INL over temperature drift, eliminating recalibration cycles during field use. |
Use Scenario: Long-term environmental monitoring using thermistors, humidity sensors, and gas detectors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power ADC managing duty-cycled sampling (e.g., 1 sample/sec) with automatic sleep/wake transitions. Use Value: 2.5 mW auto power-down mode extends battery life beyond 5 years while retaining calibration coefficients and reference stability. |
| Industrial Process Control | High-Speed Modem Analog Front-End |
Use Scenario: Digitizing 4–20 mA loop signals, strain gauge bridges, and RTD outputs in PLC I/O modules operating from 0°C to +105°C. IC Role / Device Role / Timing Role: Precision SAR ADC providing isolated channel-to-channel crosstalk <–90 dB for simultaneous multi-sensor acquisition. Use Value: System calibration capability allows end-user compensation of external op-amp gain/offset errors-reducing calibration labor by >70%. |
Use Scenario: Sampling baseband analog signals in V.34/V.90 modem designs requiring >75 dB SNR and fast settling for symbol-rate timing recovery. IC Role / Device Role / Timing Role: High-speed ADC delivering 285 kSPS throughput with 500 ns track/hold acquisition for clean signal reconstruction. Use Value: 78 dB SNR at 10 kHz and –86 dB THD enable >12-bit effective resolution-meeting ITU-T spectral mask requirements for voiceband transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7856AR-REEL7 | A-grade (-40°C to +105°C), 6 MHz CLKIN support, 285 kSPS guaranteed across full temp range | Required for extended industrial or automotive under-hood environments | Select AD7856AR-REEL7 when operation below 0°C or sustained >85°C ambient is required. |
| AD7682BCPZ-RL7 | 16-bit, 250 kSPS, SPI-only interface, no internal reference, requires external REF | Higher resolution needed; system already includes precision reference and can tolerate added component count | Choose AD7682BCPZ-RL7 only if 16-bit ENOB and lower THD (<–90 dB) are mandatory and board space permits external reference design. |
Compared with AD7856KR-REEL7, the AD7856AR-REEL7 extends temperature coverage but increases cost and power; the AD7682BCPZ-RL7 improves resolution and noise performance but removes integrated reference convenience and adds design complexity.
Availability
AD7856KR-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial process controllers, and high-speed modem front-ends requiring stable component supply across extended product lifecycles.
Supply support for AD7856KR-REEL7 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 AD7856KR-REEL7 belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-accuracy, low-power data acquisition in portable and industrial instrumentation where calibrated DC performance and flexible power management are essential.
FAQ
What is the operating temperature range for the AD7856KR-REEL7?
The AD7856KR-REEL7 is rated for operation from 0°C to +105°C, per its K-grade specification. This makes it suitable for commercial and industrial applications where ambient temperatures remain above freezing but may reach elevated levels near heat-generating components. The AD7856KR-REEL7 maintains ±2 LSB integral nonlinearity and 78 dB SNR across this full range after calibration.
Does the AD7856KR-REEL7 require an external reference voltage?
No-the AD7856KR-REEL7 includes an internal 4.096 V reference accessible at the REFIN/REFOUT pin, eliminating the need for an external reference in most applications. However, the device also supports external references from 1.2 V to AVDD, allowing users to optimize full-scale range or improve long-term stability with a higher-precision source. The AD7856KR-REEL7 automatically adapts its transfer function to the applied reference voltage.
How does the AD7856KR-REEL7 handle power management during idle periods?
The AD7856KR-REEL7 offers two programmable power-down modes controlled via PMGT1/PMGT0 bits in the control register: full shutdown (30 µA typ) and partial retention (400 µA typ). In both states, calibration data remains intact, and the internal reference stays stable. Power-down is triggered by pulling the SLEEP pin low or asserting the appropriate bits-enabling rapid wake-up (<1 µs) without recalibration. This behavior is fully documented for the AD7856KR-REEL7 in the Power-Down section of its datasheet.
Can the AD7856KR-REEL7 interface directly with an 8051 microcontroller?
Yes-the AD7856KR-REEL7's serial interface is explicitly designed to be compatible with 8051-family controllers, in addition to SPI and QSPI protocols. Its 3-wire mode (using SYNC, SCLK, and DIN/DOUT) aligns with standard 8051 GPIO timing constraints, and the control register supports software-initiated conversions via the CONVST bit-removing dependency on external hardware triggers. All timing parameters for 8051 interfacing are validated for the AD7856KR-REEL7 in the Timing Specifications table.
What calibration options are supported by the AD7856KR-REEL7?
The AD7856KR-REEL7 supports both self-calibration (on-chip DAC and reference) and system calibration (external gain/offset correction), selectable via the CALMD bit. Calibration can be initiated by the CAL pin or through software control using STCAL and CALSLT bits. Full self-calibration takes 62.5 ms (typ) at 4 MHz CLKIN. The AD7856KR-REEL7 retains calibration coefficients in on-chip memory, ensuring accuracy remains stable across power cycles and temperature excursions.
AD7856KR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 285k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 2
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- 0°C ~ 105°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7856KR-REEL7 FAQ
1.How can I place an order for AD7856KR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7856KR-REEL7 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 AD7856KR-REEL7 reliable?
The price and inventory of AD7856KR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7856KR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7856KR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7856KR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7856KR-REEL7?
AD7856KR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7856KR-REEL7 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 AD7856KR-REEL7?
For technical support, including AD7856KR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7856KR-REEL7 requirements.
6.How does Aetrix verify that AD7856KR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7856KR-REEL7 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 AD7856KR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7856KR-REEL7?
All AD7856KR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7856KR-REEL7, 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 AD7856KR-REEL7 part is unused and in its original packaging.
Return procedure for AD7856KR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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