My Inquiry
My Account
Analog Devices Inc. AD7872KRZ
- Part No.:
- AD7872KRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7872KRZ.pdf
- Description:
- IC ADC 14BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,080
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7872KRZ from Analog Devices is a complete monolithic 14-bit successive approximation analog-to-digital converter (ADC) with integrated track-and-hold amplifier, 3 V buried Zener reference, and serial-only digital interface. It operates from ±5 V supplies, accepts bipolar ±3 V analog inputs, delivers 83 kSPS throughput, achieves 80 dB SNR at 10 kHz, and features 57 ns data access time - enabling high-fidelity digitization in DSP servo control and spectrum analysis systems.
For engineers reviewing the AD7872KRZ datasheet, AD7872KRZ pinout, AD7872KRZ application, or AD7872KRZ equivalent, key selection considerations include its serial-only output architecture, internal 2 MHz clock option, ±3 V input range, 16-pin SOIC package, and compatibility with microprocessor- and standalone-based acquisition systems requiring low-noise, medium-speed sampling.
Technical Context
The AD7872KRZ implements a self-contained LC2MOS successive approximation architecture with laser-trimmed internal clock, eliminating external timing components. Its track-and-hold acquires signals to 14-bit accuracy in ≤2 μs, and conversion completes in ≤11 μs using the internal oscillator.
All dynamic performance - including 80 dB SNR, −86 dB THD, and −86 dB IMD - is fully specified across 0°C to +70°C (K version), with bipolar offset scale adjustment supported via external op-amp circuitry and unipolar operation enabled by REF OUT biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes; supports 16384 distinct output levels for precision measurement. |
| Sampling Rate | 83 kSPS - enables real-time capture of signals up to ~41.5 kHz full-power bandwidth. |
| SNR @ 10 kHz | 80 dB min - ensures high-fidelity digitization of audio and communication band signals. |
| Analog Input Range | ±3 V - compatible with standard industrial sensor outputs and op-amp signal chains without scaling. |
| Power Dissipation | 50 mW typ - suitable for thermally constrained embedded systems and portable instrumentation. |
| Reference Output | 3.00 V ±10 mV - stable on-chip Zener reference usable for external circuit biasing or calibration. |
| Data Interface | Serial only (SSTRB/SCLK/SDATA) - reduces PCB routing complexity vs. parallel ADCs; requires 3-wire SPI-like protocol. |
Pinout & Package
AD7872KRZ is housed in a 16-pin small outline integrated circuit (SOIC) package with gull-wing leads, rated for commercial temperature range (0°C to +70°C). Pin 1 is CONTROL; pin 16 is VDD (tied to pin 9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CONTROL | Selects SCLK continuity: −5 V = continuous clock; 0 V = gated clock (three-state after transmission). |
| 2 | CONVST | Asynchronous convert-start trigger; rising edge initiates hold mode and conversion sequence. |
| 3 | CLK | Accepts external TTL clock or connects to VSS to enable internal 2 MHz oscillator. |
| 4 | SSTRB | Active-low serial framing pulse; requires 4.7 kΩ pull-up; defines start of serial data frame. |
| 5 | SCLK | Gated serial clock output (open-drain); requires 2 kΩ pull-up; data valid on falling edge. |
| 6 | SDATA | Three-state serial data output; driven synchronously with SCLK/SSTRB; requires 4.7 kΩ pull-up. |
| 8 | DGND | Digital ground return - must be isolated from AGND except at single-point star connection. |
| 9, 16 | VDD | +5 V ±5% analog supply - pins 9 and 16 are internally connected and must be tied externally. |
| 11 | CREF | On-chip reference decoupling node - requires 10 nF capacitor to AGND for noise suppression. |
| 12 | AGND | Analog ground reference - critical for maintaining dc accuracy and dynamic performance. |
| 13 | REFOUT | 3 V reference output - capable of sourcing up to 500 μA; max external capacitance = 50 pF. |
| 14 | VIN | Bipolar analog input - ±3 V range into ~15 kΩ impedance; supports twos-complement coding. |
| 15 | VSS | −5 V ±5% analog supply - essential for full-scale bipolar operation and internal comparator bias. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates SAR core, track-and-hold, 3 V Zener reference, and serial interface - eliminates external DAC, reference, or timing ICs. |
| Internal 2 MHz clock | Laser-trimmed oscillator enables plug-and-play operation without external crystal or RC network; overrideable for system synchronization. |
| Low power consumption | 50 mW typical dissipation at 83 kSPS - reduces thermal load and simplifies power management in dense PCB layouts. |
| High dynamic performance | 80 dB SNR and −86 dB THD at 10 kHz - meets requirements for speech recognition, modem front-ends, and spectral analysis. |
| Bipolar/unipolar flexibility | Supports ±3 V bipolar input natively; unipolar mode enabled via REF OUT biasing - accommodates diverse sensor signal conditioning schemes. |
Applications
| Digital Signal Processing | High-Speed Modems |
|---|---|
|
Use Scenario: Real-time acquisition of baseband I/Q signals in software-defined radio receivers. IC Role / Device Role / Timing Role: ADC front-end converting analog IF samples to 14-bit serial data synchronized to system clock via CONVST. Use Value: 80 dB SNR preserves modulation fidelity; serial interface minimizes FPGA pin count and routing congestion. |
Use Scenario: Digitizing analog line signals in V.34/V.90 modem data pumps. IC Role / Device Role / Timing Role: High-accuracy sampling engine capturing voiceband waveforms at 83 kSPS with minimal harmonic distortion. Use Value: −86 dB THD prevents inter-symbol interference; ±3 V input matches line driver output swing. |
| Spectrum Analysis | DSP Servo Control |
|
Use Scenario: Input stage of handheld FFT analyzers measuring mechanical vibration harmonics. IC Role / Device Role / Timing Role: Precision digitizer feeding time-domain data to DSP for windowed FFT computation. Use Value: 14-bit resolution resolves fine spectral lines; internal clock eliminates jitter-induced spectral smearing. |
Use Scenario: Position feedback loop in industrial motion controllers using resolver or LVDT sensors. IC Role / Device Role / Timing Role: Bipolar ADC converting differential sensor outputs to twos-complement format for PID computation. Use Value: ±3 V input range matches conditioned resolver output; 2 μs acquisition time supports fast loop update rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit serial-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320U | 16-bit resolution, SPI interface, 100 kSPS, single +5 V supply, no internal reference. | Higher resolution but requires external reference and level-shifting for bipolar input. | Choose when 16-bit precision outweighs added BOM cost and design complexity. |
| MAX1166BCPP+ | 14-bit, serial interface, 100 kSPS, ±5 V supplies, internal reference, 20-pin PDIP/SO. | Same resolution and supply scheme, but larger package and no SOIC option. | Consider if board layout allows 20-pin footprint and legacy MAXIM support is preferred. |
Compared with ADS8320U and MAX1166BCPP+, the AD7872KRZ offers optimized trade-offs for cost-sensitive, space-constrained designs needing proven 14-bit performance with minimal external components - especially where SOIC packaging and integrated 3 V reference reduce layout risk.
Availability
AD7872KRZ is available at Aetrix Electronics and suitable for digital signal processing, high-speed modems, and spectrum analysis applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7872KRZ 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 AD7872KRZ belongs to the AD7871/AD7872 family of complete LC2MOS sampling ADCs, designed specifically for applications demanding integrated timing, low-noise conversion, and flexible interface options in DSP, telecom, and instrumentation systems.
FAQ
What is the operating temperature range for the AD7872KRZ?
The AD7872KRZ is the K-version device, rated for commercial operation from 0°C to +70°C. This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The "K" suffix explicitly denotes this temperature grade, and the KRZ package variant (16-pin SOIC) maintains full specification compliance across this interval.
Does the AD7872KRZ require an external clock to operate?
No, the AD7872KRZ does not require an external clock. It features a built-in laser-trimmed 2 MHz oscillator; connecting CLK (Pin 3) to VSS enables this internal clock. External clocking remains optional for system synchronization, but the internal source provides full functionality with zero external timing components.
Can the AD7872KRZ accept unipolar input signals?
Yes, the AD7872KRZ supports unipolar operation by biasing VIN with its internal 3 V REFOUT voltage, as detailed in Figure 14 of the datasheet. This configuration shifts the input range to 0 V–3 V (or scaled ranges like 0 V–5 V), and the output code can be converted to straight binary by inverting the MSB.
What is the maximum allowable capacitance on the REFOUT pin of the AD7872KRZ?
The AD7872KRZ REFOUT pin must not exceed 50 pF of total capacitance for normal operation. Exceeding this value risks instability and degraded dynamic performance. For external use beyond the IC, Analog Devices specifies a dedicated decoupling network: a 200 Ω series resistor followed by parallel 10 μF tantalum and 0.1 μF ceramic capacitors.
How is the serial data timing defined for the AD7872KRZ?
AD7872KRZ serial data timing is defined by three signals: SSTRB (active-low frame strobe), SCLK (gated serial clock), and SDATA (data output). Data is valid on the falling edge of SCLK while SSTRB is low. SCLK requires a 2 kΩ pull-up; SSTRB and SDATA each require 4.7 kΩ pull-ups. Minimum SCLK cycle time is 440 ns.
AD7872KRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 83k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7872KRZ FAQ
1.How can I place an order for AD7872KRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7872KRZ 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 AD7872KRZ reliable?
The price and inventory of AD7872KRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7872KRZ is usually 5 days.
3.What payment methods are accepted for AD7872KRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7872KRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7872KRZ?
AD7872KRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7872KRZ 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 AD7872KRZ?
For technical support, including AD7872KRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7872KRZ requirements.
6.How does Aetrix verify that AD7872KRZ is sourced from the original manufacturer or authorized distributors?
All AD7872KRZ 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 AD7872KRZ meets industry standards.
7.What is the process for return or replacement of AD7872KRZ?
All AD7872KRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7872KRZ, 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 AD7872KRZ part is unused and in its original packaging.
Return procedure for AD7872KRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7872KRZ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
