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Analog Devices Inc. AD7650ACP
- Part No.:
- AD7650ACP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7650ACP.pdf
- Description:
- IC ADC 16BIT CMOS 5V 48-LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
AD7650ACP from Analog Devices is a 16-bit, 570 kSPS charge redistribution SAR analog-to-digital converter operating from a single 5 V supply. It delivers no pipeline delay, supports parallel and SPI/QSPI/MICROWIRE-compatible serial interfaces, and features Warp/Normal/Impulse operational modes for throughput–power trade-offs. It is used in high-accuracy data acquisition systems requiring fast sampling without latency.
For engineers reviewing the AD7650ACP datasheet, AD7650ACP pinout, AD7650ACP application, or AD7650ACP equivalent, key selection considerations include its 16-bit resolution with ±6 LSB INL, 86 dB SNR at 100 kHz, 2.5 V external reference requirement, 48-lead LFCSP package, and mode-dependent timing (e.g., 1.75 µs conversion in Warp mode).
Technical Context
The AD7650ACP implements a capacitive charge redistribution SAR architecture with internal calibration logic, enabling true 16-bit linearity without pipeline delay. Its three selectable modes-Warp (570 kSPS), Normal (500 kSPS), and Impulse (444 kSPS, scalable power)-are controlled via dedicated WARP and IMPULSE digital inputs.
It integrates dual interface paths: a 16-bit parallel bus (DATA[15:0]) and a configurable 2-wire serial port (SDOUT/SCLK/SYNC) supporting master/slave operation, polarity inversion (INVSCLK), and active-level control (INVSYNC). The OB/2C input selects straight binary or two's complement output coding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees 1 LSB = 38.15 µV step size with 2.5 V reference |
| Max Throughput | 570 kSPS in Warp mode - enables real-time spectrum analysis up to ~18 MHz input bandwidth |
| DC Accuracy | ±6 LSB integral nonlinearity - ensures monotonicity and no missing codes over full 15-bit range |
| AC Performance | 86 dB SNR & 98 dB SFDR at 100 kHz - supports high-fidelity signal capture in instrumentation |
| Power Dissipation | 77 mW at 444 kSPS (Impulse mode); 7 µW in power-down - suitable for battery-powered medical devices |
| Analog Input Range | 0 V to 2.5 V differential (IN+–IN−) - requires external 2.5 V reference (e.g., ADR421) and matched input buffering |
| Interface Voltage | OVDD supports 2.7 V to 5.25 V - enables direct interfacing with both 3 V and 5 V logic families |
Pinout & Package
AD7650ACP is housed in a 48-lead Lead Frame Chip-Scale Package (LFCSP), CP-481 footprint, with exposed thermal pad. Pin numbering follows standard LQFP/LFCSP top-view orientation (Pin 1 identifier at top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog input | Accepts 0 V to 2.5 V unipolar differential signal; high CMRR (62 dB @ 10 kHz) rejects common-mode noise |
| REF, REFGND | External reference interface | Requires low-noise 2.5 V source (e.g., ADR421); draws 115 µA at 570 kSPS - demands local 1 µF + 4.7 nF decoupling |
| CNVST | Conversion start trigger | Falling-edge initiated; aperture delay = 2 ns - critical for time-aligned multi-channel sampling |
| BUSY | Conversion status indicator | Active-HIGH during conversion; falling edge signals valid data - usable as hardware-ready strobe for DMA transfers |
| SER/PAR | Interface mode select | LOW = 16-bit parallel output; HIGH = serial mode using DATA[4:11] as SDOUT/SCLK/SYNC/SDIN |
| WARP, IMPULSE | Operating mode control | WARP HIGH + IMPULSE LOW = 570 kSPS; IMPULSE HIGH + WARP LOW = power-scaled impulse mode |
| OB/2C | Output coding select | HIGH = straight binary (0x0000 = 0 V); LOW = two's complement (0x8000 = 0 V, 0xFFFF = −FSR) |
| PD, RESET | System control | PD HIGH enters 7 µW power-down; RESET HIGH aborts current conversion and clears internal logic |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY falls - eliminates latency in closed-loop control and real-time DSP |
| Mode-selectable throughput/power | Three deterministic modes: Warp (570 kSPS), Normal (500 kSPS), Impulse (444 kSPS with µW-scale idle power) |
| Dual interface flexibility | Single-part support for parallel (16-bit bus) or serial (SPI/QSPI/MICROWIRE) host connection - reduces BOM count |
| Low aperture jitter | 5 ps rms - preserves SNR at high input frequencies and enables precise time-domain measurements |
| Single 5 V supply operation | AVDD = DVDD = 5 V; OVDD independently configurable (2.7–5.25 V) - simplifies power tree in mixed-voltage systems |
Applications
| Data Acquisition Systems | Medical Instrumentation |
|---|---|
Use Scenario: High-channel-count industrial DAQ with multiplexed sensor inputs requiring synchronized sampling and minimal latency. IC Role / Device Role / Timing Role: Primary ADC capturing 16-bit waveforms at ≥500 kSPS with zero pipeline delay; CNVST edge-triggered for precise inter-channel alignment. Use Value: Enables simultaneous sampling across 8+ channels without skew-induced phase error - critical for vibration analysis and power quality monitoring. |
Use Scenario: Portable ECG or EEG monitor requiring long battery life and clinical-grade signal fidelity. IC Role / Device Role / Timing Role: Low-power 16-bit digitizer operating in Impulse mode at 100–500 SPS; PD pin managed by microcontroller to gate conversions during sleep intervals. Use Value: Achieves 21 µW typical consumption at 100 SPS while maintaining 86 dB SNR - extends battery runtime beyond 72 hours on coin cell. |
| Spectrum Analysis Equipment | Digital Signal Processing Front-End |
Use Scenario: Real-time RF spectrum analyzer with >10 MHz analog bandwidth and FFT-based signal processing. IC Role / Device Role / Timing Role: High-speed ADC running in Warp mode (570 kSPS) feeding FPGA-based FFT engine; BUSY falling edge triggers DMA burst read. Use Value: 18 MHz –3 dB input bandwidth and 98 dB SFDR allow clean capture of adjacent-channel interferers up to 10th harmonic. |
Use Scenario: Motor control system using current sensing feedback with adaptive sampling rate based on torque demand. IC Role / Device Role / Timing Role: Configurable ADC switching between Normal mode (500 kSPS for transient detection) and Impulse mode (1 kSPS for steady-state monitoring). Use Value: Dynamic mode switching reduces average power by >90% during low-dynamic periods without firmware reconfiguration overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7664AST | Pin-to-pin compatible LQFP variant; identical electrical specs but 48-lead LQFP (ST-48) instead of LFCSP | Larger footprint; higher θJA (91°C/W vs. LFCSP's 26°C/W); less suitable for space-constrained portable designs | Select AD7664AST only when board layout uses LQFP land pattern or thermal mass requirements favor larger package |
| AD7656AST | 6-channel simultaneous-sampling 16-bit SAR; 250 kSPS per channel; different pinout and serial protocol; no Warp mode | Targeted at multi-phase motor control and power electronics - not drop-in replacement for single-channel high-throughput use | Choose AD7656AST only when simultaneous sampling across ≥2 analog inputs is required and system can accommodate different interface timing and layout |
Compared with AD7650ACP, AD7664AST offers identical performance in a larger LQFP package ideal for prototyping, while AD7656AST provides multi-channel capability at lower per-channel speed - neither serves as a pin-compatible upgrade, but both address overlapping precision data acquisition needs with distinct architectural trade-offs.
Availability
AD7650ACP is available at Aetrix Electronics and suitable for data acquisition systems, medical instrumentation, spectrum analysis equipment, and digital signal processing front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7650ACP 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, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision converters, amplifiers, and RF solutions.
The AD7650ACP belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for applications demanding high resolution, high speed, and low power without pipeline latency - especially in instrumentation, medical, and industrial DAQ.
FAQ
What is the maximum sampling rate of the AD7650ACP and under what conditions is it guaranteed?
The AD7650ACP achieves a maximum sampling rate of 570 kSPS in Warp mode. This throughput is guaranteed only when the time between consecutive conversions does not exceed 1 ms; otherwise, the first conversion after a longer idle period must be discarded to ensure full specified accuracy. The AD7650ACP datasheet specifies this timing constraint explicitly in the "Throughput Speed" table and "Modes of Operation" section.
Does the AD7650ACP require an external voltage reference, and what are the key requirements?
Yes, the AD7650ACP requires an external 2.5 V reference applied to the REF pin, with REFGND tied to analog ground. The reference must supply up to 115 µA at 570 kSPS and exhibit low noise (<10 µV p-p) to preserve the ADC's 86 dB SNR. The ADR421 is explicitly recommended in the AD7650ACP datasheet, with 1 µF and 4.7 nF local decoupling capacitors.
How does the AD7650ACP handle power management, and what is its lowest power state?
The AD7650ACP supports three operational modes (Warp, Normal, Impulse) plus a dedicated power-down state. In power-down mode (PD = HIGH), its maximum power dissipation is 7 µW - verified in the "POWER SUPPLIES" table of the AD7650ACP datasheet. This state disables conversion and places all digital outputs in high-impedance, making it ideal for intermittent-sampling battery-powered systems.
Can the AD7650ACP interface directly with 3 V microcontrollers, and which pins are involved?
Yes, the AD7650ACP supports 3 V logic through its OVDD supply pin (2.7 V to 5.25 V), which powers the SER/PAR-configured interface pins (DATA[4:11], RD, CS, etc.). When OVDD = 3.3 V, the AD7650ACP outputs meet 3 V logic thresholds (VOH ≥ 2.7 V, VOL ≤ 0.4 V) and accepts 3 V-compatible inputs - confirmed in the "DIGITAL INPUTS" and "DIGITAL OUTPUTS" sections of the AD7650ACP datasheet.
What is the significance of the OB/2C pin on the AD7650ACP, and how does it affect data interpretation?
The OB/2C pin selects the digital output coding format: HIGH configures straight binary (0x0000 = 0 V, 0xFFFF = full scale), while LOW enables two's complement (0x8000 = 0 V, 0x0000 = −FSR/2, 0xFFFF = −FSR/2 + 1 LSB). This setting directly determines how host firmware interprets the 16-bit DATA[15:0] bus - a mismatch causes systematic offset errors in reconstructed analog values. The AD7650ACP datasheet defines this behavior in the "PIN FUNCTION DESCRIPTIONS" and "Transfer Functions" sections.
AD7650ACP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 570k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- 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:
- 48-LFCSP-VQ (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7650ACP FAQ
1.How can I place an order for AD7650ACP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7650ACP 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 AD7650ACP reliable?
The price and inventory of AD7650ACP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7650ACP is usually 5 days.
3.What payment methods are accepted for AD7650ACP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7650ACP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7650ACP?
AD7650ACP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7650ACP 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 AD7650ACP?
For technical support, including AD7650ACP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7650ACP requirements.
6.How does Aetrix verify that AD7650ACP is sourced from the original manufacturer or authorized distributors?
All AD7650ACP 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 AD7650ACP meets industry standards.
7.What is the process for return or replacement of AD7650ACP?
All AD7650ACP units undergo pre-shipment inspection (PSI). If there is an issue with AD7650ACP, 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 AD7650ACP part is unused and in its original packaging.
Return procedure for AD7650ACP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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