My Inquiry
My Account
Analog Devices Inc. AD7944BCPZ-RL7
- Part No.:
- AD7944BCPZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7944BCPZ-RL7.pdf
- Description:
- IC ADC 14BIT SAR 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,831
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7944BCPZ-RL7 from Analog Devices is a 14-bit, 2.5 MSPS successive approximation ADC (SAR ADC) with pseudo-differential input, on-chip reference, and SPI-compatible serial interface. It delivers ±0.25 LSB typical INL, 84.5 dB SNR with external reference, and operates from −40°C to +85°C in a 20-lead LFCSP. It targets high-speed data acquisition in battery-powered instrumentation and communications systems.
For engineers reviewing the AD7944BCPZ-RL7 datasheet, AD7944BCPZ-RL7 pinout, AD7944BCPZ-RL7 application, or AD7944BCPZ-RL7 equivalent, key selection considerations include throughput mode selection (TURBO high/low), internal vs. external reference trade-offs, daisy-chain capability, 1.8 V–2.7 V logic compatibility, and LFCSP thermal performance.
Technical Context
The AD7944BCPZ-RL7 employs a charge redistribution capacitive DAC architecture with integrated track-and-hold, delivering zero pipeline delay and deterministic conversion timing. Its dual-mode operation-TURBO high (2.5 MSPS, no inter-conversion power-down) and TURBO low (2.0 MSPS, inter-conversion power-down)-enables dynamic power scaling without sacrificing latency control.
It supports flexible reference configuration: internal 4.096 V bandgap reference (±10 ppm/°C drift) or external reference up to 5.0 V, with dedicated REFIN and BVDD pins for buffer decoupling. The serial interface offers CS mode (3-/4-wire) and chain mode, both with optional busy indicator and full SPI/QSPI/MICROWIRE/DSP compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonicity and full code coverage across temperature. |
| Throughput | 2.5 MSPS (TURBO high) or 2.0 MSPS (TURBO low) - enables real-time sampling of wideband signals up to ~9.5 MHz Nyquist. |
| INL | ±0.25 LSB typical, ±1.0 LSB max - ensures accurate DC measurement and linearity-critical sensor interfacing. |
| SNR | 84.5 dB with external reference - supports >13.7 ENOB for precision signal capture in noise-sensitive applications. |
| Power Dissipation | 15.5 mW at 2.5 MSPS with external reference - enables high-speed acquisition in thermally constrained portable designs. |
| Analog Input Range | 0 V to VREF (up to 5.0 V), pseudo-differential - simplifies front-end design by eliminating need for level-shifting amplifiers. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP compatible, 1.8 V–2.7 V VIO - allows direct connection to low-voltage FPGAs and microcontrollers without level shifters. |
Pinout & Package
AD7944BCPZ-RL7 is housed in a 20-lead, 4 mm × 4 mm LFCSP (QFN) package with exposed pad recommended for soldering to system ground plane. Thermal impedance θJA = 30.4°C/W supports sustained 2.5 MSPS operation without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 REF | Reference Output/Input | Provides 4.096 V when PDREF = low; accepts external reference up to 5.0 V when PDREF = high - requires 10 µF decoupling to REFGND. |
| 3, 4 REFGND | Analog Reference Ground | Separate ground return for reference circuitry - must be tied to analog ground plane, not shared with AGND/DGND. |
| 5 IN− | Analog Input Sense | Ground reference point for pseudo-differential input - connects to remote analog ground or sensor return to reject common-mode noise. |
| 6 IN+ | Analog Input | Primary signal input referenced to IN− - accepts 0 V to VREF differential range without external biasing. |
| 7 PDREF | Reference Power-Down Control | Digital input controlling internal reference enable/disable - high = external reference required; low = internal 4.096 V active. |
| 8 VIO | I/O Interface Supply | Independent 1.8 V–2.7 V supply for digital interface - isolates logic voltage from AVDD/DVDD, enabling mixed-voltage system integration. |
| 9 SDO | Serial Data Output | MSB-first 14-bit straight-binary output synchronized to SCK - supports daisy-chain readout in chain mode with 14-cycle delay. |
| 10 DGND | Digital Ground | Dedicated ground return for DVDD and digital I/O - must be connected to system digital ground plane with low-inductance path. |
| 11 DVDD | Digital Power Supply | 2.5 V nominal supply for digital core - specified range 2.375 V–2.625 V; powers CNV, SDI, SCK, TURBO, and SDO logic. |
| 12 SCK | Serial Clock Input | Edge-triggered clock for data readout - minimum period 9 ns (CS mode); controls timing of SDO output and internal state transitions. |
| 13 CNV | Convert Input / Mode Select | Rising edge initiates conversion and selects interface mode (CS vs. chain) - also acts as chip select in CS mode when low. |
| 14 SDI | Serial Data Input / Mode Select | Low at CNV rising edge enables chain mode; high enables CS mode - in chain mode, passes data from previous ADC to next SDO. |
| 15 TURBO | Conversion Mode Select | High enables 2.5 MSPS turbo mode (no inter-conversion power-down); low enables 2.0 MSPS normal mode with power gating. |
| 16 AVDD | Analog Power Supply | 2.5 V nominal supply for analog core - specified range 2.375 V–2.625 V; powers internal reference buffer and SAR array. |
| 17, 18 AGND | Analog Power Ground | Primary ground return for AVDD and analog circuitry - must be star-connected to minimize noise coupling into sampling node. |
| 19 BVDD | Reference Buffer Power | 5.0 V nominal supply for internal reference buffer - required when using internal reference; enables optimal SNR with external 5 V reference. |
| 20 REFIN | Reference Buffer I/O | Outputs 1.2 V bandgap when PDREF = low; accepts 1.2 V input when PDREF = high - requires 0.1 µF decoupling for stability. |
| EPAD | Exposed Thermal Pad | Not electrically connected - must be soldered to system ground plane to achieve rated θJA and prevent thermal derating. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion completion - eliminates latency uncertainty critical for closed-loop control and trigger-based acquisition. |
| Dual throughput modes | TURBO high (2.5 MSPS) and TURBO low (2.0 MSPS) - allows runtime power/performance trade-off without firmware or hardware change. |
| Flexible reference architecture | Internal 4.096 V ±10 ppm/°C reference or external 2.4 V–5.1 V support - enables calibration-grade accuracy or system-level reference sharing. |
| Daisy-chain capability | Single SDO line supports multiple AD7944BCPZ-RL7 devices - reduces PCB routing complexity and host GPIO count in multi-channel systems. |
| 1.8 V–2.7 V logic interface | VIO supply independent of AVDD/DVDD - permits direct interfacing with ultra-low-voltage processors and FPGAs without level translation. |
Applications
| Battery-Powered Data Loggers | Communications Baseband Sampling |
|---|---|
|
Use Scenario: Continuous 2.5 MSPS sampling of sensor outputs (e.g., strain gauges, thermocouples) in handheld test equipment with 10+ hour battery life. IC Role / Device Role / Timing Role: Primary SAR ADC performing pseudo-differential acquisition with internal reference and TURBO low mode for power optimization. Use Value: 15.5 mW power at 2.5 MSPS extends runtime while maintaining 14-bit resolution and 84.5 dB SNR for calibrated measurements. |
Use Scenario: Digitizing IF signals in software-defined radio (SDR) front-ends requiring precise amplitude fidelity and minimal group delay. IC Role / Device Role / Timing Role: High-speed analog-to-digital converter capturing baseband I/Q channels with zero pipeline latency and deterministic timing. Use Value: No missing codes and ±0.25 LSB INL ensure accurate constellation mapping; 19 MHz input bandwidth supports wideband modulation schemes. |
| Automated Test Equipment (ATE) | Medical Patient Monitoring |
|
Use Scenario: Multi-channel voltage/current measurement in benchtop ATE systems where channel density and timing repeatability are critical. IC Role / Device Role / Timing Role: Pin-compatible ADC in daisy-chained configuration, synchronized via shared CNV and SCK for simultaneous sampling. Use Value: Chain mode with busy indicator enables precise inter-ADC timing alignment; 20-lead LFCSP minimizes board area per channel. |
Use Scenario: ECG/EEG signal digitization in portable diagnostic devices requiring low noise, clinical-grade linearity, and low power. IC Role / Device Role / Timing Role: Front-end ADC acquiring biopotential signals with pseudo-differential input rejecting common-mode interference from body coupling. Use Value: 84 dB SNR with internal reference meets IEC 60601-2-27 noise requirements; −40°C to +85°C rating supports extended clinical deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7985BCPZ-RL7 | 16-bit resolution, same 20-lead LFCSP package and pinout - higher resolution but 2.0 MSPS max throughput and 24 mW power at full speed. | Preferred where DC precision dominates over speed (e.g., precision weigh scales), not suitable for 2.5 MSPS real-time capture. | Select AD7985BCPZ-RL7 only if 16-bit resolution is mandatory and throughput ≤2.0 MSPS suffices; verify layout compatibility with identical footprint. |
| AD7946BCPZ-RL7 | 14-bit, 400 kSPS–500 kSPS throughput, lower power (3.5 mW at 500 kSPS) - lacks TURBO mode and daisy-chain capability. | Targeted at low-power, moderate-speed applications (e.g., industrial sensors), not viable for ≥2 MSPS signal capture. | Choose AD7946BCPZ-RL7 for battery-operated remote sensors needing <5 mW average power; avoid for communication or ATE use cases. |
Compared with AD7944BCPZ-RL7, AD7985BCPZ-RL7 trades 0.5 MSPS speed and +8.5 mW power for +2 bits resolution and identical pinout, while AD7946BCPZ-RL7 sacrifices >80% throughput and daisy-chain flexibility to reduce power by >75% - making AD7944BCPZ-RL7 the sole option balancing 14-bit fidelity, 2.5 MSPS speed, and system-level interface features.
Availability
AD7944BCPZ-RL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, communications infrastructure, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7944BCPZ-RL7 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, with R&D and manufacturing operations worldwide.
The AD7944BCPZ-RL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high speed, low power, and excellent DC/AC performance in space-constrained environments.
FAQ
What is the maximum sampling rate of the AD7944BCPZ-RL7?
The AD7944BCPZ-RL7 achieves a maximum sampling rate of 2.5 MSPS in TURBO high mode, confirmed in Table 2 of the Rev. C datasheet. In TURBO low mode, the maximum rate is 2.0 MSPS. Both modes guarantee no missing codes and specified AC/DC performance across the full −40°C to +85°C operating range. Conversion time is 320 ns in turbo mode and 420 ns in normal mode.
Does the AD7944BCPZ-RL7 require an external reference?
No, the AD7944BCPZ-RL7 includes a 4.096 V internal reference with ±10 ppm/°C drift, enabled by pulling PDREF low. An external reference (2.4 V–5.1 V) may be used by setting PDREF high and connecting to REF and REFIN. The internal reference delivers 84 dB SNR; external reference improves SNR to 84.5 dB and supports wider input ranges.
Can multiple AD7944BCPZ-RL7 devices be connected on a single serial bus?
Yes, the AD7944BCPZ-RL7 supports daisy-chain operation in chain mode: configure SDI low at CNV rising edge, then connect SDO of one device to SDI of the next. Each device delays its output by 14 SCK cycles, allowing sequential readout of all conversion results on a single SDO line without additional chip-select lines.
What is the purpose of the BVDD and REFIN pins on the AD7944BCPZ-RL7?
BVDD supplies 5.0 V to the internal reference buffer, required for optimal SNR when using the internal reference. REFIN outputs 1.2 V (typical) from the bandgap when PDREF is low, or accepts 1.2 V input when PDREF is high and external buffering is needed. Both pins require dedicated decoupling (10 µF and 0.1 µF respectively) per the datasheet layout guidelines.
Is the AD7944BCPZ-RL7 pin-compatible with other PulSAR ADCs?
Yes, the AD7944BCPZ-RL7 is pin-for-pin compatible with the 16-bit AD7985BCPZ-RL7 and 18-bit AD7986BCPZ-RL7, as stated in Table 1 and confirmed in the General Description section. This allows resolution scalability within the same PCB footprint, though timing and power characteristics differ between variants.
AD7944BCPZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 20-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 2.5M
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-LFCSP (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7944BCPZ-RL7 FAQ
1.How can I place an order for AD7944BCPZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7944BCPZ-RL7 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 AD7944BCPZ-RL7 reliable?
The price and inventory of AD7944BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7944BCPZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7944BCPZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7944BCPZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7944BCPZ-RL7?
AD7944BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7944BCPZ-RL7 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 AD7944BCPZ-RL7?
For technical support, including AD7944BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7944BCPZ-RL7 requirements.
6.How does Aetrix verify that AD7944BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7944BCPZ-RL7 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 AD7944BCPZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7944BCPZ-RL7?
All AD7944BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7944BCPZ-RL7, 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 AD7944BCPZ-RL7 part is unused and in its original packaging.
Return procedure for AD7944BCPZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7944BCPZ-RL7 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…
