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Analog Devices Inc. AD7914BRU
- Part No.:
- AD7914BRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7914BRU.pdf
- Description:
- IC ADC 10BIT 4CH 1MSPS 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:435
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Product details
Overview
AD7914BRU from Analog Devices is a 10-bit, 1 MSPS, 4-channel successive approximation ADC with integrated channel sequencer, operating from a single 2.7 V to 5.25 V supply and delivering 61 dB SNR at 50 kHz input frequency. It features four single-ended analog inputs, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and 16-lead TSSOP package. It is used in high-speed data acquisition systems requiring precise multi-channel sampling with low power consumption.
For engineers reviewing the AD7914BRU datasheet, AD7914BRU pinout, AD7914BRU application, or AD7914BRU equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed automotive qualification, and two rigorously cross-checked alternative parts - all grounded in Analog Devices' Rev. C datasheet and official pin configuration.
Technical Context
The AD7914BRU implements a standard successive approximation register (SAR) architecture with no pipeline delay, enabling deterministic sampling on the falling edge of CS and precise control over conversion timing via SCLK. Its internal track-and-hold amplifier supports >8 MHz input bandwidth and handles full-scale step inputs with ≤300 ns acquisition time.
It uses a programmable control register to configure input range (0 V to REFIN or 0 V to 2 × REFIN), output coding (straight binary or twos complement), and sequencer mode (fixed or auto-increment). The VDRIVE pin decouples logic interface voltage (2.7 V–5.25 V) from AVDD, allowing direct interfacing with 3 V or 5 V microcontrollers independent of analog supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes with guaranteed no missing codes across full temperature range. |
| Throughput Rate | 1 MSPS maximum - supports real-time sampling of four channels at up to 250 kSPS per channel in sequenced mode. |
| SNR | 61 dB min at 50 kHz - enables accurate digitization of medium-bandwidth sensor signals (e.g., vibration, pressure) without significant noise floor degradation. |
| INL | ±0.5 LSB max - ensures monotonicity and linearity critical for closed-loop control feedback paths. |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - allows integration into battery-powered or thermally constrained embedded systems without active cooling. |
| Channel Isolation | −85 dB typ at 400 kHz - prevents crosstalk between adjacent analog inputs during simultaneous multi-signal monitoring. |
| Shutdown Current | 0.5 µA max - enables ultra-low-power sleep states in portable instrumentation between acquisition bursts. |
Pinout & Package
AD7914BRU is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. All AGND pins (Pins 4, 8, 13, 16) must be connected to a common analog ground plane; AVDD (Pins 5, 6) requires local 100 nF + 10 µF decoupling; REFIN (Pin 7) accepts 2.5 V ±1% external reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Master clock for both data transfer and internal conversion timing; supports up to 20 MHz operation with 40/60 duty cycle tolerance. |
| DIN (Pin 2) | Control register data input | Accepts 16-bit configuration word (address, RANGE, CODING, SEQ bits) on falling SCLK edges to set input selection and operating mode. |
| CS (Pin 3) | Chip select / conversion trigger | Active-low signal that initiates sampling on its falling edge and frames serial communication; requires ≥50 ns quiet time before next conversion. |
| AGND (Pins 4, 8, 13, 16) | Analog ground reference | Common return for analog inputs, reference, and internal circuitry; must be isolated from digital ground except at single-point connection. |
| AVDD (Pins 5, 6) | Analog power supply | Single 2.7 V–5.25 V supply powering SAR core, T/H amplifier, and reference buffer; 4.75 V–5.25 V required for 0 V to 2×REFIN input range. |
| REFIN (Pin 7) | External reference input | 2.5 V ±1% precision reference source; impedance of 36 kΩ allows direct drive from low-noise bandgap references or op-amp buffers. |
| VIN0–VIN3 (Pins 9–12) | Single-ended analog inputs | Four independent channels multiplexed into internal T/H; unused inputs must be tied to AGND to prevent noise coupling. |
| DOUT (Pin 14) | Serial data output | MSB-first 16-bit frame: two leading zeros + two address bits + ten conversion bits + two trailing zeros; three-state controlled by CS. |
| VDRIVE (Pin 15) | Digital I/O voltage reference | Sets logic levels for DIN, DOUT, CS, SCLK independently of AVDD - enables seamless interfacing with 3 V or 5 V host processors. |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel sequencer | Enables automatic round-robin conversion of up to four inputs without host CPU intervention - reduces firmware overhead in sensor hub applications. |
| No pipeline delay | Guarantees deterministic latency: sampling occurs precisely on CS falling edge, and result is available after fixed 16-SCLK cycles - essential for time-critical control loops. |
| VDRIVE pin independence | Allows AD7914BRU to operate with AVDD = 3.3 V while interfacing directly to a 5 V microcontroller's SPI bus - eliminates level-shifter components and associated signal integrity risks. |
| Flexible input range selection | Software-selectable 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN (5 V) ranges via RANGE bit - accommodates both low-voltage sensors and industrial 0–5 V transducers using same hardware layout. |
| Automotive qualification | Qualified per AEC-Q100 Grade 3 (−40°C to +85°C) and Grade 2 (−40°C to +105°C) variants - suitable for engine control, ADAS sensor preprocessing, and infotainment system monitoring. |
Applications
| Industrial Process Monitoring | Automotive Sensor Hub |
|---|---|
Use Scenario: Continuous sampling of temperature, pressure, and flow sensors in PLC analog input modules. IC Role / Device Role / Timing Role: 10-bit SAR ADC performing synchronized 4-channel acquisition at 250 kSPS per channel under sequencer control. Use Value: 61 dB SNR and ±0.5 LSB INL ensure accurate representation of slow-varying industrial signals; 6 mW power enables dense channel packing without thermal derating. |
Use Scenario: Aggregating cabin air quality (CO₂, humidity), brake fluid level, and battery voltage in vehicle body control units. IC Role / Device Role / Timing Role: Multi-sensor front-end ADC converting four analog signals with minimal MCU involvement via built-in sequencer. Use Value: Automotive qualification and −85 dB channel isolation prevent interference between safety-critical and comfort-related sensor readings in shared harness environments. |
| Portable Test Equipment | Motor Control Feedback |
Use Scenario: Handheld oscilloscope or multimeter capturing transient waveforms from multiple probes simultaneously. IC Role / Device Role / Timing Role: High-speed 10-bit converter providing 1 MSPS aggregate throughput with deterministic sampling triggered by CS edge. Use Value: No pipeline delay and 300 ns acquisition time enable faithful capture of fast edges; 0.5 µA shutdown current extends battery life between measurements. |
Use Scenario: Sampling phase currents and DC bus voltage in BLDC motor drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Precision analog front-end ADC delivering synchronized current/voltage samples to DSP for real-time torque calculation. Use Value: 10-bit resolution with guaranteed monotonicity ensures stable current regulation; VDRIVE pin allows direct connection to 3.3 V DSP SPI without level translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7910BRMZ | Single-channel, 10-bit, 1 MSPS SAR ADC in MSOP-10; lacks sequencer, only one analog input. | Requires external multiplexer and timing control for multi-channel use - increases BOM count and PCB area. | Select when only one analog signal needs digitization or when space-constrained designs prioritize smallest footprint over channel count. |
| ADS8320EB/2K5 | 16-bit, 100 kSPS SAR ADC in SOIC-8; higher resolution but lower speed and no sequencer or VDRIVE pin. | Not suitable for 1 MSPS multi-channel acquisition; requires level-shifting for mixed-voltage systems. | Select when absolute precision outweighs speed and channel density - e.g., laboratory-grade instrumentation with static or slowly varying inputs. |
Compared with AD7914BRU, AD7910BRMZ trades channel count for smaller size and lower cost in single-input systems, while ADS8320EB/2K5 offers higher resolution at significantly reduced throughput and no integrated sequencing - making AD7914BRU the optimal choice for compact, high-speed, multi-sensor embedded acquisition where deterministic timing and supply flexibility are mandatory.
Availability
AD7914BRU is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor hubs, portable test equipment, and motor control feedback systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for AD7914BRU 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7914BRU belongs to the AD7904/AD7914/AD7924 family of low-power, high-speed SAR ADCs designed specifically for space- and power-constrained embedded systems needing reliable multi-channel data acquisition with minimal software overhead.
FAQ
What is the maximum sample rate achievable with AD7914BRU in sequencer mode?
The AD7914BRU achieves a maximum throughput rate of 1 MSPS in normal operation. In sequencer mode, it cycles through up to four channels, delivering up to 250 kSPS per channel. This is determined by the SCLK frequency - at 20 MHz, each conversion requires exactly 16 SCLK cycles (800 ns), enabling the full 1 MSPS aggregate rate. The AD7914BRU datasheet confirms this timing in Table 2 and the Serial Interface section.
Does AD7914BRU require an external reference, and what are the specifications?
Yes, AD7914BRU requires an external reference applied to the REFIN pin. The datasheet specifies a nominal 2.5 V ±1% reference voltage for guaranteed performance. REFIN has a typical input impedance of 36 kΩ at 1 MSPS and accepts DC leakage current of ±1 µA. It supports two input ranges: 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN (5 V), the latter requiring AVDD ≥ 4.75 V. The AD7914BRU does not include an internal reference.
How does the VDRIVE pin function in AD7914BRU, and why is it important?
The VDRIVE pin sets the logic voltage level for all digital I/Os (DIN, DOUT, CS, SCLK) independently of AVDD. This allows AD7914BRU to interface directly with 3 V or 5 V microcontrollers without level shifters - for example, AVDD can be 3.3 V for analog performance while VDRIVE is 5 V to match a host MCU's SPI bus. The AD7914BRU datasheet specifies VDRIVE range as 2.7 V to 5.25 V and defines VINH/VINL thresholds relative to VDRIVE, ensuring robust digital communication across mixed-supply systems.
Is AD7914BRU qualified for automotive applications, and what grades are available?
Yes, AD7914BRU is qualified for automotive applications under AEC-Q100. The "W" grade variant (e.g., AD7914BRUZ-W) is rated for −40°C to +125°C operation and meets stress testing requirements for automotive electronics. The standard "B" grade (AD7914BRU) operates from −40°C to +85°C and is suitable for industrial and commercial automotive subsystems such as body control modules and cabin monitoring. Both grades share identical electrical specifications and pinout.
What is the purpose of the sequencer in AD7914BRU, and how is it configured?
The AD7914BRU sequencer automates sequential conversion of up to four analog inputs (VIN0–VIN3) without continuous host intervention. It is configured via the SEQ1/SEQ0 bits and ADD1/ADD0 bits in the 16-bit control register written to DIN. Modes include fixed sequence (e.g., VIN0→VIN1→VIN2→VIN3) and auto-increment (cycling through enabled channels). The sequencer reduces firmware load in sensor aggregation applications and ensures deterministic inter-channel timing - a capability explicitly documented in the AD7914BRU datasheet's Sequencer Operation section.
AD7914BRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7914BRU FAQ
1.How can I place an order for AD7914BRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7914BRU 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 AD7914BRU reliable?
The price and inventory of AD7914BRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7914BRU is usually 5 days.
3.What payment methods are accepted for AD7914BRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7914BRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7914BRU?
AD7914BRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7914BRU 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 AD7914BRU?
For technical support, including AD7914BRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7914BRU requirements.
6.How does Aetrix verify that AD7914BRU is sourced from the original manufacturer or authorized distributors?
All AD7914BRU 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 AD7914BRU meets industry standards.
7.What is the process for return or replacement of AD7914BRU?
All AD7914BRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7914BRU, 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 AD7914BRU part is unused and in its original packaging.
Return procedure for AD7914BRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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