My Inquiry
My Account
Analog Devices Inc. AD7939BCP-REEL7
- Part No.:
- AD7939BCP-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7939BCP-REEL7.pdf
- Description:
- IC ADC 10BIT 8CH PARALL 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7939BCP-REEL7 from Analog Devices is a 10-bit, 8-channel, 1.5 MSPS parallel-output SAR ADC with integrated sequencer, on-chip 2.5 V reference (±0.2% @ 25°C), and software-configurable analog input modes (single-ended, pseudo-differential, or fully differential). It operates from a single 2.7 V to 5.25 V supply and delivers 61 dB SINAD at 50 kHz input frequency in differential mode - suited for high-speed data acquisition in industrial PLCs and motor control feedback loops.
For engineers reviewing the AD7939BCP-REEL7 datasheet, AD7939BCP-REEL7 pinout, AD7939BCP-REEL7 application, or AD7939BCP-REEL7 equivalent, key selection considerations include its 32-lead LFCSP package, VDRIVE-enabled 3 V/5 V interface compatibility, no-pipeline-delay conversion architecture, and channel sequencing capability for multi-sensor monitoring without external controller intervention.
Technical Context
The AD7939BCP-REEL7 implements a successive approximation register (SAR) architecture with a differential track-and-hold amplifier supporting up to 50 MHz full-power bandwidth. Its sequencer enables preprogrammed, automatic cycling across eight analog inputs without host processor involvement.
Conversion is triggered by a falling edge on CONVST, with BUSY signaling active conversion duration; data is read via a high-speed parallel interface supporting both word (12-bit) and byte (8-bit) modes using WR, RD, CS, and W/B controls. The VDRIVE pin decouples logic I/O voltage (2.7 V–5.25 V) from analog supply (VDD), enabling direct interfacing to mixed-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 distinct digital codes for moderate-precision sensor digitization. |
| Throughput Rate | 1.5 MSPS - supports real-time sampling of fast transients in motor current or vibration sensing. |
| SINAD | 61 dB min (differential mode, 50 kHz) - defines usable dynamic range for noise-sensitive measurements. |
| On-Chip Reference | 2.5 V ±0.2% @ 25°C, 25 ppm/°C - eliminates need for external precision reference in cost-constrained designs. |
| Power Dissipation | 6 mW max @ 3 V / 1.5 MSPS - enables low-power operation in battery-backed or thermally constrained systems. |
| Analog Input Modes | Software-selectable single-ended, pseudo-differential, or fully differential - accommodates diverse sensor output types (e.g., RTD, thermocouple, current loop). |
| Package | 32-lead LFCSP (5 mm × 5 mm, 0.5 mm pitch) - provides compact footprint and thermal performance (θJA = 108.2°C/W). |
Pinout & Package
The AD7939BCP-REEL7 is housed in a 32-lead Lead Frame Chip Scale Package (LFCSP) with exposed pad for thermal and ground integrity. Pin 1 is located at top-left per Figure 2; the exposed pad must be soldered to PCB ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB0–DB7 | Data bus (low byte) | Three-state outputs carrying LSBs of conversion result; DB0–DB1 always 0 when reading AD7939; logic levels set by VDRIVE. |
| DB8/HBEN | Data Bit 8 / High Byte Enable | In word mode: DB8; in byte mode: HBEN controls whether DB0–DB7 carry low byte (HBEN low) or high nibble (HBEN high); DB4–DB6 encode channel ID during reads. |
| DB9–DB11 | Data bus (high bits) | Three-state outputs carrying MSBs of 12-bit result; unused bits zeroed for 10-bit AD7939 in word mode. |
| CONVST | Conversion Start | Falling-edge-triggered signal that initiates sampling and conversion; also wakes device from autoshutdown/autostandby. |
| BUSY | Conversion Status | Active-high open-drain output indicating conversion in progress; goes low when result is latched and ready for read. |
| VDRIVE | Logic Interface Supply | Defines voltage threshold for all digital I/O pins; may differ from VDD (but ≤ VDD + 0.3 V), enabling direct connection to 3 V or 5 V processors. |
| VREFIN/VREFOUT | Reference Input/Output | Provides 2.5 V internal reference; can be overdriven with external reference (0.1 V to VDD) for improved accuracy or ratiometric operation. |
| AGND/DGND | Analog/Digital Ground | Separate ground pins require tight coupling (≤0.3 V potential difference) to minimize noise coupling between analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel sequencer | Enables autonomous, repeatable scanning of up to eight sensors without CPU polling or firmware overhead. |
| VDRIVE interface independence | Allows parallel bus to operate at 3 V or 5 V regardless of VDD, simplifying integration with mixed-voltage SoCs and FPGAs. |
| No pipeline delay | Delivers deterministic latency: conversion completes in fixed 13-clock cycles after CONVST, critical for closed-loop timing predictability. |
| Flexible analog input configuration | Single register bit selects among single-ended, pseudo-differential, or fully differential input structures - adapts to varied sensor topologies. |
| Full shutdown mode | Reduces quiescent current to ≤2 µA, enabling ultra-low-power sleep states in portable or energy-harvested systems. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
Use Scenario: Simultaneous sampling of temperature, pressure, flow, and valve position signals in distributed I/O modules. IC Role / Device Role / Timing Role: 8-channel SAR ADC with built-in sequencer acquires synchronized samples across sensors at 1.5 MSPS, eliminating need for external multiplexer and timing logic. Use Value: Reduces BOM count and PCB area while maintaining deterministic sampling intervals required for PID loop stability. | Use Scenario: Real-time capture of three-phase motor currents and DC bus voltage for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Parallel-output ADC delivers 10-bit results with no pipeline latency, enabling sub-microsecond current loop update rates. Use Value: Supports high-bandwidth torque control with minimal phase lag, improving dynamic response and efficiency. |
| Programmable Logic Controller (PLC) Analog Input Module | Test & Measurement Data Logger |
Use Scenario: Modular analog input card accepting 0–10 V, ±5 V, and 4–20 mA signals from field instruments. IC Role / Device Role / Timing Role: Configurable input structure (single-ended/pseudo-diff/diff) and programmable range bits support multiple sensor standards within one hardware design. Use Value: Enables flexible channel configuration via firmware, reducing SKU proliferation and inventory complexity. | Use Scenario: Portable environmental logger recording vibration, acoustic emission, and thermal profiles over extended periods. IC Role / Device Role / Timing Role: Low-power 6 mW operational mode and 2 µA shutdown current extend battery life; sequencer automates multi-sensor polling. Use Value: Achieves >1 week runtime on coin-cell batteries while maintaining 1.5 MSPS burst capture capability for transient event detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7938BCP-REEL7 | 12-bit resolution, identical package and pinout, same sequencer and interface features. | Higher resolution required for precision metrology or high-fidelity waveform capture. | Select when ≥12-bit ENOB is mandatory and system can accommodate higher code density and slightly increased power (13.5 mW @ 5 V). |
| AD7934BRUZ | 4-channel, 10-bit, TSSOP-28 package; lacks sequencer; lower pin count and power (4.5 mW @ 3 V). | Lower channel count suffices; space-constrained board with no need for autonomous scanning. | Choose for simpler, lower-cost designs where only four inputs are needed and firmware handles channel selection. |
Compared with AD7939BCP-REEL7, AD7938BCP-REEL7 offers higher resolution at identical speed and interface compatibility, while AD7934BRUZ reduces channel count and package size for cost-sensitive, low-channel-count applications - neither is pin-compatible with AD7939BCP-REEL7's 32-lead LFCSP.
Availability
AD7939BCP-REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, and programmable logic controller (PLC) analog input modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7939BCP-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 AD7938/AD7939 product line delivers high-speed, low-power SAR ADCs optimized for industrial automation, test equipment, and real-time control systems where deterministic latency, multi-channel sequencing, and flexible input configuration are essential.
FAQ
What is the maximum throughput rate supported by the AD7939BCP-REEL7?
The AD7939BCP-REEL7 supports a maximum throughput rate of 1.5 MSPS, achieved with a 25.5 MHz master clock (CLKIN) and 13-clock-cycle conversion time. This rate is maintained across its full operating temperature range (−40°C to +85°C) and supply range (2.7 V to 5.25 V), making AD7939BCP-REEL7 suitable for demanding real-time acquisition tasks such as motor current sampling and vibration analysis.
Does the AD7939BCP-REEL7 include an internal voltage reference?
Yes, the AD7939BCP-REEL7 integrates a precise 2.5 V on-chip reference with ±0.2% initial accuracy at 25°C and a temperature coefficient of 25 ppm/°C maximum. This reference is accessible at the VREFIN/VREFOUT pin and may be overdriven with an external reference (0.1 V to VDD) for enhanced accuracy or ratiometric measurement - a key feature distinguishing AD7939BCP-REEL7 from basic SAR converters requiring external references.
How does the channel sequencer function in the AD7939BCP-REEL7?
The AD7939BCP-REEL7 sequencer allows preprogramming of up to eight analog input channels for automatic, cyclic conversion without host processor intervention. Channel order and enablement are configured via the on-chip control register. Once started, the sequencer advances through enabled channels on each CONVST edge, latching results into the output register - a capability central to AD7939BCP-REEL7's role in multi-sensor industrial data acquisition.
What package type is used for the AD7939BCP-REEL7, and what are its thermal characteristics?
The AD7939BCP-REEL7 uses a 32-lead LFCSP (CP-32-7) package measuring 5 mm × 5 mm with 0.5 mm lead pitch and an exposed thermal pad. Its thermal impedance is θJA = 108.2°C/W and θJC = 32.71°C/W, enabling efficient heat dissipation in compact industrial enclosures. The exposed pad must be soldered to the PCB ground plane using multiple thermal vias - a critical layout requirement for reliable AD7939BCP-REEL7 operation at full throughput.
Can the AD7939BCP-REEL7 interface directly with a 3 V microcontroller while powered from a 5 V supply?
Yes, the AD7939BCP-REEL7 supports independent logic and analog supplies via the VDRIVE pin. When VDRIVE = 3 V and VDD = 5 V, all digital I/O pins (DB0–DB11, RD, WR, CS, etc.) operate at 3 V logic levels, allowing direct, level-shift-free connection to 3 V microcontrollers or FPGAs - a defining interoperability feature of AD7939BCP-REEL7 in mixed-voltage system designs.
AD7939BCP-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad, CSP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1.5M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- 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:
- 32-LFCSP-VQ (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7939BCP-REEL7 FAQ
1.How can I place an order for AD7939BCP-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7939BCP-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 AD7939BCP-REEL7 reliable?
The price and inventory of AD7939BCP-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7939BCP-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7939BCP-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7939BCP-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7939BCP-REEL7?
AD7939BCP-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7939BCP-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 AD7939BCP-REEL7?
For technical support, including AD7939BCP-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7939BCP-REEL7 requirements.
6.How does Aetrix verify that AD7939BCP-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7939BCP-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 AD7939BCP-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7939BCP-REEL7?
All AD7939BCP-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7939BCP-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 AD7939BCP-REEL7 part is unused and in its original packaging.
Return procedure for AD7939BCP-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7939BCP-REEL7 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…
