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Analog Devices Inc. AD7650ASTZ
- Part No.:
- AD7650ASTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7650ASTZ.pdf
- Description:
- IC ADC 16BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,245
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Product details
Overview
AD7650ASTZ 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 0 V to 2.5 V unipolar analog input range, and provides both parallel and SPI/QSPI/MICROWIRE-compatible serial interfaces. It is used in high-speed data acquisition systems requiring precise timing and low-latency conversion.
For engineers reviewing the AD7650ASTZ datasheet, AD7650ASTZ pinout, AD7650ASTZ application, or AD7650ASTZ equivalent, this page details its Warp/Normal/Impulse mode operation, 48-lead LQFP package mapping, true 16-bit DC accuracy (±6 LSB INL), AC performance (86 dB SNR at 100 kHz), and dual-interface flexibility for embedded instrumentation and battery-powered signal chains.
Technical Context
The AD7650ASTZ implements a capacitive charge redistribution DAC architecture with internal calibration logic, enabling true 16-bit resolution without missing codes across –40°C to +85°C. Its conversion core uses a track-and-hold circuit that acquires input on the falling edge of CNVST and completes conversion in as little as 1.75 µs (Warp mode).
Three selectable operating modes-Warp (570 kSPS, 1 ms max inter-conversion interval), Normal (500 kSPS, no timing restriction), and Impulse (444 kSPS, power scaled to throughput)-are controlled via dedicated WARP and IMPULSE digital inputs. The OB/2C pin selects straight binary or two's complement output coding, while SER/PAR configures interface topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees monotonicity and no missing codes over full temperature range |
| Max Throughput | 570 kSPS in Warp mode - enables real-time spectral analysis with ≤1.75 µs conversion cycle |
| Analog Input Range | 0 V to 2.5 V - compatible with standard 2.5 V references like ADR421; requires external REFGND connection |
| DC Accuracy | ±6 LSB integral nonlinearity - ensures <0.1% FSR error in precision instrumentation calibration |
| AC Performance | 86 dB SNR at 100 kHz - supports >14-bit effective resolution for clean baseband signal capture |
| Power Dissipation | 77 mW at 444 kSPS (Impulse mode) - enables portable medical devices with multi-hour battery life |
| Interface Options | Parallel 16-bit bus or 2-wire serial (SPI/QSPI/MICROWIRE) - allows direct FPGA connection or microcontroller SPI peripheral use |
Pinout & Package
AD7650ASTZ is housed in a 48-lead LQFP (ST-48) package with exposed pad, rated for –40°C to +85°C operation. Pin 1 is marked by a corner notch; AGND and DGND pins must be separately routed to minimize analog/digital coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog input pair | Accepts 0 V to 2.5 V unipolar input; IN– tied to analog ground reference point |
| REF, REFGND | External reference voltage interface | Requires low-impedance 2.5 V source (e.g., ADR421); REFGND must be star-connected to AGND |
| CNVST | Conversion start trigger | Falling-edge sensitive; initiates sample/hold hold phase and conversion sequence |
| BUSY | Conversion status indicator | Active-HIGH during conversion; falling edge signals valid data ready for read |
| SER/PAR | Interface mode select | LOW = parallel 16-bit bus; HIGH = serial mode using DATA[4–11] as SDOUT/SCLK/SYNC/SDIN |
| WARP, IMPULSE | Operating mode control | WARP=HIGH + IMPULSE=LOW → Warp mode; IMPULSE=HIGH + WARP=LOW → Impulse mode |
| OB/2C | Output coding select | HIGH = straight binary (0x0000–0xFFFF); LOW = two's complement (0x8000–0x7FFF) |
| AVDD, DVDD, OVDD | Independent power domains | AVDD/DVDD = 4.75–5.25 V analog/digital supplies; OVDD = 2.7–5.25 V I/O interface supply |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY falls - eliminates latency-induced phase errors in closed-loop control |
| Three power-performance modes | Warp (570 kSPS), Normal (500 kSPS), Impulse (444 kSPS @ 77 mW → 21 µW @ 100 SPS) - enables adaptive system-level power management |
| Single 5 V supply operation | Eliminates need for ±5 V or 3.3 V/5 V dual-rail supplies - reduces BOM count and layout complexity |
| Pin-to-pin compatibility with AD7664 | Enables drop-in upgrade path to higher-resolution 18-bit variant without PCB redesign |
| Low aperture jitter (5 ps rms) | Preserves SFDR >98 dB at 100 kHz - critical for high-fidelity spectrum analysis and communications test equipment |
Applications
| Portable Medical ECG Monitor | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Continuous 16-bit sampling of low-amplitude biopotential signals (0.5–5 mV) at ≥1 kSPS with minimal power draw. IC Role / Device Role / Timing Role: Primary ADC capturing differential electrode inputs; CNVST synchronized to isolated timing controller; BUSY used as DRDY interrupt. Use Value: Impulse mode cuts average power to <100 µW at 250 SPS, extending battery life beyond 72 hours while maintaining <±6 LSB linearity for diagnostic-grade waveform fidelity. |
Use Scenario: High-density 16-channel analog input card acquiring 4–20 mA sensor outputs with cold-junction compensation and isolation. IC Role / Device Role / Timing Role: Channel-scan ADC interfaced via parallel bus to ARM Cortex-M7 MCU; WARP mode enables full 16-channel scan at 35 kSPS per channel. Use Value: Parallel interface reduces CPU overhead vs. SPI; separate AVDD/DVDD/OGND domains suppress noise coupling from switching power supplies and digital backplane. |
| RF Spectrum Analyzer Front-End | High-Speed Digital Oscilloscope Acquisition |
Use Scenario: Digitizing IF signals up to 18 MHz bandwidth with >98 dB SFDR for EMC pre-compliance testing. IC Role / Device Role / Timing Role: Baseband ADC following RF mixer and anti-alias filter; driven by low-jitter clock; OB/2C set for two's complement for DSP FFT processing. Use Value: 18 MHz –3 dB input bandwidth and 5 ps aperture jitter preserve spectral purity; 86 dB SNR enables detection of –80 dBc spurs in 100 kHz RBW measurements. |
Use Scenario: 1 GS/s equivalent-time sampling system using interleaved ADCs, where each channel requires deterministic latency and no pipeline bubbles. IC Role / Device Role / Timing Role: Time-interleaved SAR ADC with CNVST externally phased; BUSY falling edge triggers synchronous latch of 16-bit parallel data into FIFO. Use Value: Zero-latency conversion and immediate data validity eliminate dead-time gaps between samples - essential for accurate rise-time measurement of fast digital edges. |
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 |
|---|---|---|---|
| AD7664BCPZ | 18-bit resolution, 570 kSPS, same 48-lead LFCSP footprint but not pin-compatible with AD7650ASTZ LQFP | Higher resolution required for metrology-grade calibration; lacks Impulse mode power scaling | Select when ENOB >15.5 bits needed and board space permits LFCSP rework |
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI-only interface, 1.8 V supply, 0.5 µA power-down current | Ultra-low-power battery sensing; no parallel interface or 5 V tolerance | Select for new designs targeting sub-100 µW average power and TI ecosystem integration |
Compared with AD7650ASTZ, AD7664BCPZ trades pin compatibility for higher resolution and lower noise floor, while ADS8860IDRCT abandons parallel interface and 5 V operation to achieve deeper power savings - neither offers identical feature parity, making AD7650ASTZ uniquely suited for legacy 5 V systems needing mode-flexible 16-bit performance.
Availability
AD7650ASTZ is available at Aetrix Electronics and suitable for industrial PLC analog input modules, portable medical ECG monitors, RF spectrum analyzer front-ends, and high-speed digital oscilloscope acquisition systems requiring stable component supply and long-term lifecycle support.
Supply support for AD7650ASTZ 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.
The AD7650ASTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high speed, low latency, and flexible power/performance trade-offs in instrumentation and data acquisition.
FAQ
What is the maximum sampling rate of the AD7650ASTZ and under what conditions is it guaranteed?
The AD7650ASTZ achieves a maximum throughput of 570 kSPS in Warp mode. This rate is guaranteed only when the time between consecutive conversions does not exceed 1 ms; otherwise, the first conversion after a long idle period must be discarded to ensure full specified accuracy. The AD7650ASTZ maintains 500 kSPS in Normal mode without any inter-conversion timing constraint, making it suitable for asynchronous data acquisition where timing predictability is critical.
Does the AD7650ASTZ require an external voltage reference, and what are the key requirements?
Yes, the AD7650ASTZ requires an external 2.5 V reference applied to the REF pin, with REFGND connected to analog ground. The reference must drive up to 115 µA peak current 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 datasheet, used with a 47 µF decoupling capacitor, and must be placed close to REF/REFGND with low-inductance routing.
How does the AD7650ASTZ handle power management, and what is its lowest operational power state?
The AD7650ASTZ supports three dynamic power modes: Warp (77 mW at 444 kSPS), Normal (85 mW typical), and Impulse (21 µW at 100 SPS). In addition, a dedicated PD pin enables hardware-controlled power-down mode, reducing consumption to 7 µW maximum. All digital inputs must be held at OVDD or OGND in power-down to meet this specification, and wake-up time is negligible due to absence of PLL lock or reference stabilization delays.
Can the AD7650ASTZ interface directly with 3 V microcontrollers, and how is level compatibility achieved?
Yes, the AD7650ASTZ supports mixed-voltage operation: AVDD and DVDD run at 5 V for analog/digital core integrity, while OVDD can be set to 2.7–5.25 V to match host logic levels. When OVDD = 3.3 V, all digital outputs (DATA[0–15], BUSY, RD, CS) swing between 0 V and ~2.7 V, and inputs (WARP, IMPULSE, SER/PAR) accept 0.8 V/2.0 V thresholds - enabling direct connection to 3 V MCUs without level shifters.
What is the significance of the OB/2C pin on the AD7650ASTZ, 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 = 2.5 V), while LOW enables two's complement (0x8000 = 0 V, 0x7FFF = +1.25 V, 0xFFFF = –12.5 mV). This choice directly impacts firmware sign-extension logic and DSP algorithm alignment - for example, two's complement simplifies AC-coupled signal processing in spectrum analyzers, whereas straight binary eases offset calibration in unipolar sensor interfaces.
AD7650ASTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 570k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, Parallel, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7650ASTZ FAQ
1.How can I place an order for AD7650ASTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7650ASTZ 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 AD7650ASTZ reliable?
The price and inventory of AD7650ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7650ASTZ is usually 5 days.
3.What payment methods are accepted for AD7650ASTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7650ASTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7650ASTZ?
AD7650ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7650ASTZ 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 AD7650ASTZ?
For technical support, including AD7650ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7650ASTZ requirements.
6.How does Aetrix verify that AD7650ASTZ is sourced from the original manufacturer or authorized distributors?
All AD7650ASTZ 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 AD7650ASTZ meets industry standards.
7.What is the process for return or replacement of AD7650ASTZ?
All AD7650ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7650ASTZ, 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 AD7650ASTZ part is unused and in its original packaging.
Return procedure for AD7650ASTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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