My Inquiry
My Account
Analog Devices Inc. AD7927BRU
- Part No.:
- AD7927BRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7927BRU.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7927BRU from Analog Devices is a 12-bit, 8-channel successive approximation ADC with integrated channel sequencer, operating at up to 200 kSPS with 3 V or 5 V single-supply power. It features 0 V to REFIN or 0 V to 2 × REFIN input ranges, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and 20-lead TSSOP packaging. It is qualified for automotive applications and delivers 70 dB SINAD at 50 kHz.
For engineers reviewing the AD7927BRU datasheet, AD7927BRU pinout, AD7927BRU application, or AD7927BRU equivalent, key selection considerations include sequencer-configurable multi-channel sampling, VDRIVE-independent logic interface, no pipeline delay, shutdown current of 0.5 μA, and channel-to-channel isolation of −82 dB at 400 kHz.
Technical Context
The AD7927BRU implements a track-and-hold amplifier with 8.2 MHz full-power bandwidth and 300 ns acquisition time, enabling accurate sampling of wideband analog signals. Its conversion is clocked directly by the SCLK (up to 20 MHz), with conversion time as short as 800 ns and no pipeline latency.
It supports flexible configuration via a 12-bit write-only control register, enabling dynamic selection of input range (0–REFIN or 0–2×REFIN), output coding (straight binary or twos complement), power mode (normal/auto/full shutdown), and sequencer operation (single-channel, shadow-register-defined dual sequences, or consecutive channel cycling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = 0.024% of full-scale for precise industrial sensing and control. |
| Throughput Rate | 200 kSPS maximum - supports real-time monitoring of fast transients in motor control or power quality systems. |
| SINAD | 70 dB min at 50 kHz - ensures high-fidelity digitization of audio-band and sensor signals with low noise floor. |
| Input Channels | 8 single-ended - enables compact multi-sensor data acquisition without external multiplexers. |
| Power Dissipation | 3.6 mW max at 3 V / 200 kSPS - allows battery-powered or thermally constrained embedded designs. |
| Channel Isolation | −82 dB typ at 400 kHz - prevents crosstalk between simultaneously active channels in mixed-signal systems. |
| Shutdown Current | 0.5 μA max - extends system-level sleep-mode battery life in portable or automotive ECUs. |
Pinout & Package
AD7927BRU is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP) with exposed pad, optimized for thermal performance (θJA = 143°C/W) and PCB space efficiency in automotive and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Master clock for both data transfer and internal conversion timing; supports up to 20 MHz for 800 ns conversion. |
| DIN | Data input | Loads 12-bit control register on falling SCLK edges; enables dynamic reconfiguration between conversions. |
| CS | Chip select (active low) | Initiates sampling on falling edge and frames serial data; defines conversion start instant with precise timing control. |
| VIN0–VIN7 | Analog inputs | Eight single-ended channels; selected via ADD2–ADD0 bits or sequencer; unused pins must tie to AGND to prevent noise coupling. |
| DOUT | Data output | Serial stream includes leading zero + 3-bit channel address + 12-bit result (MSB first); supports SPI-compatible readback. |
| REFIN | Reference input | Accepts 2.5 V ±1% external reference; sets full-scale range for both 0–REFIN and 0–2×REFIN modes. |
| VDRIVE | Logic supply | Decouples serial interface voltage (2.7–5.25 V) from AVDD; allows direct interfacing with 3 V or 5 V microcontrollers. |
| AVDD | Analog power supply | 2.7–5.25 V single supply; must be 4.75–5.25 V for 0–2×REFIN input range operation. |
| AGND | Analog ground | Common reference for all analog circuitry; four dedicated pins ensure low-noise grounding and reduce ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated channel sequencer | Programmable consecutive or non-consecutive 8-channel scan via control register or shadow register-eliminates host CPU polling overhead. |
| VDRIVE logic supply independence | Serial interface operates at user-defined voltage (2.7–5.25 V), independent of AVDD-enables seamless integration with mixed-voltage SoCs. |
| No pipeline delay | Sampling instant precisely aligned to CS falling edge; conversion completes before next CS assertion-critical for deterministic control loops. |
| Flexible power management | Three operational modes (Normal, Auto Shutdown, Full Shutdown) with 1 μs wake-up-optimizes energy use across variable sample-rate profiles. |
| High DC accuracy | ±1 LSB INL, ±0.9/+1.5 LSB DNL, guaranteed no missing codes-supports precision measurement in calibration-critical instrumentation. |
Applications
| Motor Control Feedback | Automotive Battery Monitoring |
|---|---|
|
Use Scenario: Real-time sampling of phase currents, back-EMF, and temperature sensors in 3-phase inverter drives. IC Role / Device Role / Timing Role: 8-channel simultaneous sequencing ADC providing synchronized acquisition across current shunts and NTCs with sub-microsecond timing alignment. Use Value: Enables vector control algorithms with <1 μs inter-channel skew and 70 dB SINAD for accurate torque estimation under PWM noise. |
Use Scenario: Monitoring cell voltages, pack current, and thermal gradients in 12–48 V EV/HEV battery management systems. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC acquiring multiple voltage rails and thermistor readings during active charge/discharge cycles. Use Value: Delivers ±1 LSB INL and −82 dB channel isolation to reject common-mode switching noise from DC-DC converters and inverters. |
| Industrial PLC Analog Input Module | Medical Patient Monitor Signal Chain |
|
Use Scenario: Digitizing 4–20 mA loop outputs, thermocouple voltages, and RTD bridges in modular I/O racks. IC Role / Device Role / Timing Role: Multi-channel front-end ADC with programmable input range (0–2.5 V or 0–5 V) and sequencer-driven cyclic scanning per slot. Use Value: Reduces BOM count by eliminating external muxes and reference buffers; 3.6 mW power enables fanless enclosure design. |
Use Scenario: Acquiring ECG, SpO₂, and respiration waveforms in portable bedside monitors with strict EMC and low-power requirements. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing bio-potential signals with >70 dB SINAD at 50 Hz and minimal digital coupling. Use Value: Achieves clinical-grade SNR using internal track-and-hold (8.2 MHz BW) and 0.5 μA shutdown current for extended battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7923BRU | 4-channel version, identical architecture, same 20-lead TSSOP package and pinout except VIN4–VIN7 omitted. | Lower channel count reduces PCB routing complexity but requires external mux for >4 inputs. | Select when system needs only 4 analog inputs and board space is constrained. |
| ADS7957IRHBT | Texas Instruments 8-channel 12-bit SAR ADC; 1 MSPS max rate; 1.8–5.25 V supply; SPI interface; 32-pin QFN package. | Higher speed and wider supply range, but larger footprint and no automotive qualification. | Choose for higher throughput or 1.8 V logic compatibility; not suitable for AEC-Q100-compliant automotive modules. |
Compared with AD7927BRU, AD7923BRU offers pin-compatible channel reduction for simpler systems, while ADS7957IRHBT trades automotive qualification and TSSOP fit for higher speed and broader voltage support-neither is drop-in, requiring layout or firmware adaptation.
Availability
AD7927BRU is available at Aetrix Electronics and suitable for motor control feedback, automotive battery monitoring, industrial PLC analog input modules, and medical patient monitor signal chains requiring stable component supply across automotive and industrial lifecycles.
Supply support for AD7927BRU 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 DSP technologies, serving industrial, automotive, communications, and healthcare markets with precision signal processing solutions.
The AD7927BRU belongs to Analog Devices' precision SAR ADC product line, designed specifically for multi-channel data acquisition in space- and power-constrained environments where timing determinism and automotive reliability are mandatory.
FAQ
What is the maximum sampling rate supported by the AD7927BRU?
The AD7927BRU supports a maximum throughput rate of 200 kSPS, achieved with a 20 MHz serial clock (SCLK). Conversion time is fixed at 16 SCLK cycles, so the actual rate scales linearly with SCLK frequency-e.g., 10 MHz SCLK yields 100 kSPS. This rate applies across the full operating temperature range (−40°C to +85°C for the BRU grade) and supply range (2.7 V to 5.25 V).
Does the AD7927BRU require an external reference voltage?
Yes, the AD7927BRU requires an external reference voltage applied to the REFIN pin. The device is specified for optimal performance with a 2.5 V ±1% reference. It supports two input ranges-0 V to REFIN or 0 V to 2 × REFIN-selected via the RANGE bit in the control register. No internal reference is provided; REFIN must be stable and low-noise to maintain DC accuracy and SINAD performance.
How does the sequencer function work on the AD7927BRU?
The AD7927BRU sequencer enables automatic cycling through up to eight analog inputs without host intervention. It operates in three modes: single-channel (address bits only), consecutive sequence (e.g., VIN0 → VIN1 → … → VINn), or dual shadow-defined sequences. Configuration is done via SEQ/SHADOW bits and the 16-bit shadow register. Once programmed, the sequencer advances on each CS assertion, reducing firmware overhead in multi-sensor systems.
Can the AD7927BRU interface directly with a 3.3 V microcontroller while powered from 5 V?
Yes, the AD7927BRU supports independent logic and analog supplies via the VDRIVE pin. When VDRIVE = 3.3 V and AVDD = 5 V, the serial interface (SCLK, DIN, DOUT, CS) operates at 3.3 V logic levels, while the analog section runs at 5 V for extended input range (0–2×REFIN). This eliminates level-shifting components and simplifies mixed-voltage system integration.
What is the channel-to-channel isolation specification for the AD7927BRU?
The AD7927BRU provides −82 dB typical channel-to-channel isolation at 400 kHz, measured by applying a full-scale 400 kHz sine wave to seven non-selected inputs while converting a 50 kHz signal on the selected channel. This high isolation minimizes crosstalk in dense multi-sensor layouts and ensures accurate concurrent measurements in noisy industrial or automotive environments.
AD7927BRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7927BRU FAQ
1.How can I place an order for AD7927BRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7927BRU 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 AD7927BRU reliable?
The price and inventory of AD7927BRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7927BRU is usually 5 days.
3.What payment methods are accepted for AD7927BRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7927BRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7927BRU?
AD7927BRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7927BRU 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 AD7927BRU?
For technical support, including AD7927BRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7927BRU requirements.
6.How does Aetrix verify that AD7927BRU is sourced from the original manufacturer or authorized distributors?
All AD7927BRU 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 AD7927BRU meets industry standards.
7.What is the process for return or replacement of AD7927BRU?
All AD7927BRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7927BRU, 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 AD7927BRU part is unused and in its original packaging.
Return procedure for AD7927BRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7927BRU 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…
