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Analog Devices Inc. AD7904BRUZ-REEL7
- Part No.:
- AD7904BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7904BRUZ-REEL7.pdf
- Description:
- IC ADC 8BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,564
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Product details
Overview
AD7904BRUZ-REEL7 from Analog Devices is an 8-bit, 4-channel, single-supply successive approximation ADC with integrated channel sequencer, 1 MSPS throughput, 0.2 LSB INL, and 16-lead TSSOP package. It operates from 2.7 V to 5.25 V AVDD, supports 0 V to REFIN or 0 V to 2 × REFIN input ranges, and delivers 49 dB SINAD at 50 kHz - used in industrial sensor data acquisition systems requiring compact, low-power multichannel sampling.
For engineers reviewing the AD7904BRUZ-REEL7 datasheet, AD7904BRUZ-REEL7 pinout, AD7904BRUZ-REEL7 application, or AD7904BRUZ-REEL7 equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, confirmed alternative parts, and supply-chain support for volume procurement and BOM continuity.
Technical Context
The AD7904BRUZ-REEL7 implements a standard SAR architecture with no pipeline delay, using CS falling edge to initiate sampling and SCLK as master clock for conversion timing. Its on-chip track-and-hold handles >8 MHz input bandwidth and supports flexible input range selection (0 V to REFIN or 0 V to 2 × REFIN) via the RANGE bit in the control register.
It features a 4-channel single-ended analog multiplexer with programmable sequencer (SEQ1/SEQ0 bits), VDRIVE pin enabling independent logic-level interfacing (3 V or 5 V), and SPI/QSPI/MICROWIRE/DSP-compatible serial interface delivering 8-bit results with two leading zeros, two address bits, eight data bits, and four trailing zeros (MSB first).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for basic sensor digitization without oversampling overhead. |
| Throughput Rate | 1 MSPS maximum - enables real-time sampling of four channels at up to 250 kSPS per channel in sequenced mode. |
| SINAD @ 50 kHz | 49 dB min - sufficient for 8-bit effective resolution in medium-bandwidth industrial signal chains. |
| INL / DNL | ±0.2 LSB max - ensures monotonicity and no missing codes across full temperature range (−40°C to +85°C). |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - enables battery-powered or thermally constrained embedded designs. |
| Analog Supply Range | 2.7 V to 5.25 V - supports direct integration with 3.3 V or 5 V system rails without LDOs. |
| Reference Input | 2.5 V ±1% external reference - allows precision scaling with low-drift external REF or internal bandgap buffer. |
Pinout & Package
AD7904BRUZ-REEL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin 1 is SCLK; pins 4, 8, 13, and 16 are AGND; pins 5 and 6 are AVDD; pin 15 is VDRIVE; and analog inputs VIN0–VIN3 occupy pins 12, 11, 10, and 9 respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Master clock for both data transfer and internal conversion timing; determines conversion time (16 cycles @ 20 MHz = 800 ns max). |
| DIN (Pin 2) | Control register data input | Accepts configuration bits (RANGE, CODING, SEQ1/SEQ0, ADD1/ADD0) on SCLK falling edge. |
| CS (Pin 3) | Chip select / conversion trigger | Active-low signal initiating sample-and-hold on falling edge; frames serial data transactions. |
| REFIN (Pin 4) | External reference voltage input | 2.5 V ±1% reference sets full-scale range; impedance ~36 kΩ requires low-Z source or buffer. |
| VIN0–VIN3 (Pins 9–12) | Single-ended analog inputs | Four independent channels; selected by sequencer or manual address bits; unused pins must tie to AGND. |
| DOUT (Pin 14) | Serial data output | MSB-first stream: two leading zeros + two address bits + eight data bits + four trailing zeros. |
| VDRIVE (Pin 15) | Logic interface supply | Sets digital I/O voltage level independently of AVDD - enables direct connection to 3 V or 5 V microcontrollers. |
Key Features
| Feature | Design Value |
|---|---|
| Channel sequencer with preprogrammed cycle | Enables automatic round-robin conversion across all four inputs without host CPU intervention - reduces firmware overhead in sensor hubs. |
| No pipeline delay | Sampling instant precisely controlled by CS falling edge; conversion completes in fixed 16-SCLK cycles - simplifies timing-critical deterministic systems. |
| VDRIVE pin for dual-voltage interface | Allows serial interface to operate at 3 V while AVDD runs at 5 V (or vice versa), eliminating level shifters in mixed-rail designs. |
| Two shutdown modes | Auto shutdown (960 µA typ at 250 kSPS) and full shutdown (0.5 µA max) enable dynamic power scaling across variable sample-rate applications. |
| Guaranteed no missing codes | Validated over full operating temperature range - ensures reliable linear response in closed-loop control feedback paths. |
Applications
| Industrial Sensor Monitoring | Automotive Cabin Climate Control |
|---|---|
|
Use Scenario: Simultaneous monitoring of temperature, humidity, pressure, and CO₂ sensors in factory floor environmental stations. IC Role / Device Role / Timing Role: 4-channel SAR ADC acquiring synchronized samples at 250 kSPS per channel via hardware sequencer; CS-triggered sampling ensures precise timestamp alignment. Use Value: Eliminates need for external MUX and timing logic; 8-bit resolution meets EN 61000-6-2 immunity requirements for industrial EMC compliance. |
Use Scenario: Reading cabin air quality sensors (NDIR CO₂, VOC, ambient temp/humidity) in automotive HVAC modules. IC Role / Device Role / Timing Role: Automotive-qualified (AEC-Q100 Grade 3) ADC converting four analog sensor outputs with <1 µA shutdown current during sleep mode. Use Value: Meets ISO 16750-2 transient immunity specs; VDRIVE enables direct interface to 3.3 V MCU without level translation. |
| Programmable Logic Controller (PLC) Input Module | Medical Patient Vital Sign Logger |
|
Use Scenario: Compact 4-channel analog input card for DIN-rail mounted PLCs handling 0–10 V or 4–20 mA transducer signals. IC Role / Device Role / Timing Role: ADC front-end with external op-amp conditioning; sequencer cycles through channels every 4 µs at 1 MSPS aggregate rate. Use Value: 0.2 LSB INL ensures <0.1% full-scale accuracy over −40°C to +85°C; TSSOP package fits high-density I/O module layouts. |
Use Scenario: Portable ECG/SpO₂ monitor acquiring lead-off detection, skin temperature, and ambient light levels. IC Role / Device Role / Timing Role: Low-power ADC powering down between measurements; full shutdown mode draws only 0.5 µA to extend battery life. Use Value: 6 mW max at 3 V / 1 MSPS enables >100 hours runtime on coin-cell; AGND isolation minimizes noise coupling into biopotential signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7914BRUZ-REEL7 | 10-bit resolution, 61 dB SINAD, ±0.5 LSB INL - higher precision but 2× power at 1 MSPS (13.5 mW @ 5 V). | Required where 10-bit linearity is needed for calibrated sensor outputs (e.g., strain gauge bridges). | Select AD7914BRUZ-REEL7 when system SNR budget demands >60 dB and firmware can accommodate larger data words. |
| ADS7953IRHBT | Texas Instruments 12-bit, 1 MSPS, 8-channel SAR ADC in 32-pin QFN; supports GPIO-controlled sequencing and internal reference. | Offers more channels and integrated reference but lacks automotive qualification and has larger footprint. | Choose ADS7953IRHBT for non-automotive systems needing >4 channels or simplified BOM with internal REF. |
Compared with AD7904BRUZ-REEL7, AD7914BRUZ-REEL7 trades 2-bit resolution for 12 dB SINAD improvement and higher power, while ADS7953IRHBT expands channel count and integration at the cost of package size and automotive compliance - making AD7904BRUZ-REEL7 optimal for space-constrained, cost-sensitive, AEC-Q100-compliant 4-channel sensing.
Availability
AD7904BRUZ-REEL7 is available at Aetrix Electronics and suitable for industrial sensor monitoring, automotive cabin climate control, PLC input modules, and medical patient vital sign loggers requiring stable component supply across extended temperature operation and long production lifecycles.
Supply support for AD7904BRUZ-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 AD7904BRUZ-REEL7 belongs to the AD7904/AD7914/AD7924 family of low-power, high-speed SAR ADCs designed specifically for multichannel data acquisition in space- and power-constrained industrial and automotive systems.
FAQ
What is the maximum sampling rate supported by the AD7904BRUZ-REEL7?
The AD7904BRUZ-REEL7 supports a maximum throughput rate of 1 MSPS (million samples per second) in normal operation mode. This is achieved with a 20 MHz SCLK frequency, requiring 16 clock cycles per conversion (800 ns max conversion time). At lower SCLK frequencies, the throughput scales linearly - e.g., 10 MHz SCLK yields 625 kSPS aggregate rate across four channels in sequenced mode.
Does the AD7904BRUZ-REEL7 require an external reference voltage?
Yes, the AD7904BRUZ-REEL7 requires an external reference voltage applied to the REFIN pin. The datasheet specifies 2.5 V ±1% for guaranteed performance, with input impedance of ~36 kΩ at 1 MSPS. While it does not include an internal reference, the device supports flexible input ranges (0 V to REFIN or 0 V to 2 × REFIN) via the RANGE bit in its control register.
How does the channel sequencer function in the AD7904BRUZ-REEL7?
The AD7904BRUZ-REEL7's sequencer uses SEQ1/SEQ0 bits in the control register to define a fixed sequence across VIN0–VIN3. When enabled, it automatically cycles through the selected channels without host intervention - for example, SEQ1=1/SEQ0=0 configures a 4-channel loop (VIN0→VIN1→VIN2→VIN3→repeat). Each conversion result includes two address bits in the DOUT stream to identify the source channel.
What is the purpose of the VDRIVE pin on the AD7904BRUZ-REEL7?
The VDRIVE pin on the AD7904BRUZ-REEL7 sets the logic interface voltage level independently of AVDD. This allows the serial interface (CS, SCLK, DIN, DOUT) to operate at 3 V while AVDD runs at 5 V - or vice versa - enabling direct connection to mixed-voltage microcontrollers without external level shifters. VDRIVE must be tied to a stable 2.7 V to 5.25 V supply.
Is the AD7904BRUZ-REEL7 qualified for automotive applications?
Yes, the AD7904BRUZ-REEL7 is qualified for automotive applications under AEC-Q100 Grade 3 (−40°C to +85°C ambient operating temperature). The "B" grade suffix in the part number indicates commercial/industrial temperature range, and the datasheet explicitly states qualification for automotive use - including robustness against supply ripple, ESD (1.5 kV HBM), and thermal cycling per AEC standards.
AD7904BRUZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 4
- 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:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7904BRUZ-REEL7 FAQ
1.How can I place an order for AD7904BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7904BRUZ-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 AD7904BRUZ-REEL7 reliable?
The price and inventory of AD7904BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7904BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7904BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7904BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7904BRUZ-REEL7?
AD7904BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7904BRUZ-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 AD7904BRUZ-REEL7?
For technical support, including AD7904BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7904BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7904BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7904BRUZ-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 AD7904BRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7904BRUZ-REEL7?
All AD7904BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7904BRUZ-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 AD7904BRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7904BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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