AD7655ACPZRL - 16-Bit 1MSPS 4-Ch SAR ADC | Analog Devices
MPN: AD7655ACPZRL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.95 | $169.50 |
| 100 | $15.2 | $1,520.00 |
| 500 | $13.8 | $6,900.00 |
| 1,000 | $12.65 | $12,650.00 |
| 3,000 | $11.4 | $34,200.00 |
AD7655ACPZRL Overview
A successive-approximation register ADC is a converter architecture that performs bit-by-bit trial conversions using an internal DAC, comparator, and successive-approximation register, achieving low latency and deterministic behavior compared to pipelined or delta-sigma converters. The AD7655 belongs to the PulSAR family of precision SAR ADCs from Analog Devices, sitting within the broader iCMOS (industrial CMOS) high-voltage process family and the company's mixed-signal data-converter product line.
Key features include dual track-and-hold amplifiers that allow simultaneous sampling of two channels, true 16-bit resolution with no missing codes, no pipeline delay inherent to its SAR architecture, parallel or serial (SPI/QSPI/MICROWIRE/DSP-compatible) digital interface, and an operating temperature range of -40C to +85C. Per the manufacturer datasheet, the part accepts a 5 V analog supply and operates from a flexible digital supply.
Typical applications include multi-channel data acquisition systems, industrial process control, instrumentation, motor control feedback loops, and medical monitoring equipment. Its four simultaneous-sampling channels make it a natural fit for three-phase power monitoring, vibration analysis, and any polyphase measurement requiring synchronized conversion of multiple analog signals at high resolution.
When designing with the AD7655ACPZRL, place 10 uF tantalum and 100 nF ceramic bypass capacitors as close as possible to the AVDD and DVDD pins, and ensure the exposed thermal pad is soldered to a continuous analog ground plane for thermal dissipation and low-impedance analog return. Driver amplifier selection matters: per the AD7655 datasheet, the 16-bit settling time must be verified before choosing an external op amp, as 0.1% or 0.01% settling specifications from amplifier datasheets can differ significantly from 16-bit (0.0015%) settling.
This page synthesizes distributor pricing across DigiKey, Mouser, and authorized partners, drop-in alternatives within the ADI PulSAR family, and practical layout guidance that extends the manufacturer datasheet with engineer-focused perspective.
Drop-in alternatives for AD7655ACPZRL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7655ACPZRL (same form factor and footprint) — differing in Architecture, Number of Channels, Packaging, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7655ACPZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7655ACPZ-1REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7655ACP
✅ Drop-In📋 Reference alternative (not in catalog)
AD7655SCP-EP-RL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7634BCPZRL
✅ Drop-In✓ In Stock
$36.8 / Unit
View Datasheet →AD7655ACPZRL Maximum Ratings & Electrical Characteristics
| Number of Bits | 16 |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 2 / 4 (multiplexed, dual track-and-hold) |
| Sampling Rate | 1 MSPS (normal mode); 888 kSPS (impulse mode) |
| Analog Input Range | +/-10 V, 0 V to 5 V, +/-5 V (bipolar & unipolar) |
| Digital Interface | Parallel + Serial (SPI/QSPI/MICROWIRE/DSP-compatible) |
| Number of Channels | 4 |
| Track-and-Hold Amplifiers | 2 (dual, simultaneous sampling) |
| Pipeline Delay | None (SAR architecture) |
| Operating Temperature Range | -40C to +85C |
| Analog Supply Voltage (AVDD) | 5 V |
| Digital Supply Voltage (DVDD) | 5 V / 3 V (logic-flexible) |
| Package | 48-LFCSP-VQ (7x7 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Converter Family | PulSAR (iCMOS process) |
AD7655ACPZRL 48-lfcsp-vq (7x7 mm) with exposed pad Pin Configuration Guide
Pin configuration for AD7655ACPZRL (48-lfcsp-vq (7x7 mm) with exposed pad package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AD7655ACPZRL.
Refer to the datasheet for full pin configuration.
Typical Applications
AD7655ACPZRL is suitable for 7 applications: Multi-Channel Data Acquisition Systems, Motor Control / Three-Phase Inverter Feedback, Industrial Process Control Instrumentation, Medical Monitoring and Patient Diagnostics, Power Line Monitoring and Protection Relays, Test and Measurement Instrumentation, Vibration and Acoustic Analysis.
Multi-Channel Data Acquisition Systems
The AD7655ACPZRL is well-suited to multi-channel industrial data acquisition systems requiring synchronized sampling of multiple analog inputs at 16-bit resolution. Its 4 channels served by 2 track-and-hold amplifiers allow simultaneous sampling of paired channels at 1 MSPS, eliminating time skew between critical measurements. The lack of pipeline delay inherent to SAR architecture simplifies timing analysis in multiplexed designs, while the parallel/serial interface flexibility lets the part connect directly to FPGAs, DSPs, or microcontrollers. With +/-10 V true bipolar input range, the ADC connects directly to industrial +/-10 V process signals without external signal conditioning, reducing BOM cost and PCB area. Per the Analog Devices AD7655 datasheet, the SNR (86 dB typical) and INL (+/-2 LSB typical) are sufficient for 0.1%-accuracy measurement applications in test equipment, factory automation, and condition monitoring.
Recommended
Motor Control / Three-Phase Inverter Feedback
The AD7655ACPZRL is purpose-built for three-phase motor control feedback loops where simultaneous current sensing is critical. Its dual track-and-hold amplifiers synchronize two current measurements per conversion, while the four channels accommodate three-phase currents plus DC bus voltage. At 1 MSPS throughput with no pipeline delay, the SAR architecture delivers deterministic conversion timing that field-oriented control (FOC) algorithms depend on. The +/-10 V bipolar input range directly accepts shunt-resistor amplified currents from typical motor-drive signal-conditioning stages. Per the ADI datasheet, the 5 V analog supply tolerance to industrial transients and the 48-LFCSP-VQ exposed-pad package enable robust operation in inverter-grade PCB layouts alongside IGBT/MOSFET switching stages.
Recommended
Industrial Process Control Instrumentation
The AD7655ACPZRL delivers 16-bit precision at 1 MSPS for industrial process control instrumentation such as distributed control systems (DCS), programmable logic controllers (PLCs) with analog cards, and supervisory control systems. The true bipolar +/-10 V input range matches legacy +/-10 V and 4-20 mA (with sense resistor) signal levels commonly used in process plants, eliminating external level-shifting circuits. Per the Analog Devices datasheet, the iCMOS process technology enables the wide input range on a single 5 V analog supply, reducing analog supply tree complexity. The 48-LFCSP-VQ exposed-pad package provides thermal performance suitable for industrial temperature operation (-40C to +85C) in sealed enclosures.
Recommended
Medical Monitoring and Patient Diagnostics
Medical monitoring equipment such as patient monitors, ECG/EEG acquisition modules, and infusion-pump pressure feedback benefit from the AD7655ACPZRL's combination of 16-bit resolution, multi-channel simultaneous sampling, and bipolar input range. The 4 channels support EEG/ECG lead pairs or multi-parameter patient monitoring (heart rate, respiration, blood pressure, SpO2 front-end) while the dual track-and-hold captures synchronized cardiac waveform samples at the same instant. Per the ADI datasheet, the no-pipeline-delay SAR timing avoids processing-induced latency that could affect arrhythmia detection algorithms. For medical-grade designs requiring isolation barriers, the digital interface allows placement of the ADC close to the analog front-end with isolators downstream.
Recommended
Power Line Monitoring and Protection Relays
The AD7655ACPZRL is well-matched to three-phase power line monitoring equipment, transmission-line protection relays, and smart-grid metering infrastructure. Per the Analog Devices datasheet, the simultaneous-sampling capability of two channel pairs supports three-phase voltage and current monitoring with synchronized conversion timestamps essential for phasor calculations and harmonic analysis. At 1 MSPS sampling the ADC oversamples mains waveforms (50/60 Hz) by a factor of >16000x per cycle, supporting anti-alias filtering and harmonic content measurement up to the kHz range. The +/-10 V input range accepts standard power-system measurement transformer (PT/CT) outputs with appropriate burden resistors, eliminating external attenuator stages.
Recommended
Test and Measurement Instrumentation
Automatic test equipment (ATE), benchtop multimeters, spectrum-analyzer digitizers, and bench data loggers leverage the AD7655ACPZRL's 1 MSPS 16-bit capture across 4 channels. Per the ADI datasheet, the -90 dB typical THD and 86 dB typical SNR enable precision waveform digitizer design for test instruments measuring audio-bandwidth signals. The SPI/QSPI/MICROWIRE/DSP-compatible serial interface simplifies connection to modern test-instrument FPGAs and DSPs, while the parallel interface provides 16-bit bus-style data with standard CS/RD control. The exposed-pad package supports the thermal dissipation required for continuous 1 MSPS sampling on all 4 channels concurrently.
Recommended
Vibration and Acoustic Analysis
Vibration analysis systems for industrial condition monitoring (pumps, motors, gearboxes) and acoustic sensing applications such as sonar front-ends use the AD7655ACPZRL to digitize multiple accelerometer / microphone signals with synchronized sampling. Per the Analog Devices datasheet, the dual track-and-hold preserves phase relationships between vibration channels - critical for modal analysis where phase coherence across sensors determines structural-mode identification. The bipolar input range accepts typical IEPE-sensor preamplifier outputs (+/-5 V or +/-10 V), while 16-bit resolution at 1 MSPS captures bearing-fault signatures well above the typical 10-50 kHz vibration range. The deterministic SAR latency simplifies time-synchronous averaging (TSA) algorithms used in predictive-maintenance applications.
Recommended
Recommended Products Summary
Engineering reference data for AD7655ACPZRL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7655ACPZ | AD7655ACPZ-1REEL | AD7655ACP | AD7655SCP-EP-RL | AD7634BCPZRL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-LFCSP-VQ (7x7) | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 18 bits (+12.5%) |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 670 kSPS (-33%) |
| Number of Channels | 4 (dual T/H) | 4 (dual T/H) | 4 (dual T/H) | 4 (dual T/H) | 4 (dual T/H) | 1 (single channel) |
| Analog Input Range | +/-10 V, +/-5 V, 0-5 V | +/-10 V, +/-5 V, 0-5 V | +/-10 V, +/-5 V, 0-5 V | +/-10 V, +/-5 V, 0-5 V | +/-10 V, +/-5 V, 0-5 V | 0-5 V, +/-5 V (true bipolar) |
| Pipeline Delay | None (SAR) | None (SAR) | None (SAR) | None (SAR) | None (SAR) | None (SAR) |
| Interface | Parallel + Serial (SPI/QSPI/DSP) | Parallel + Serial | Parallel + Serial | Parallel + Serial | Parallel + Serial | Serial (SPI/QSPI/DSP) |
| Approx. Unit Price (1k) | $12.65 | Similar (TR variant pricing) | Similar (variant pricing) | Similar (tray variant pricing) | Higher (EP screening) | Higher (18-bit) |
Key Differentiators
- True bipolar +/-10 V input range without external level-shift (vs AD7634BCPZRL)
- Dual track-and-hold enables 4-channel simultaneous sampling (vs AD7634BCPZRL)
- 1 MSPS throughput at 16-bit with no-pipeline-delay SAR timing (vs Most pipelined 16-bit ADCs)
- Flexible parallel/serial digital interface for legacy and modern controllers (vs Single-interface competitors)
Design Notes
Per the Analog Devices AD7655 datasheet, place a 10 uF tantalum bulk decoupling capacitor and a 100 nF ceramic bypass capacitor as close as possible to each AVDD and DVDD pin. Separate analog and digital ground planes joined under the exposed thermal pad minimize digital switching noise coupling into sensitive analog sampling circuits. The reference input (REF) requires both a 10 uF ceramic bypass cap and a 100 nF ceramic cap to REFGND. Inadequate decoupling of REFIN will directly degrade SNR (from datasheet-typical 86 dB down to 70 dB or worse).
Solder the exposed thermal pad (EP) to a continuous analog ground plane using a 4x4 thermal via array for heat transfer to inner ground layers. Keep analog input traces symmetric and short; route differential pairs with constant 50-ohm impedance and 100-ohm differential characteristic. Place the driver amplifier within 2-3 inches of the ADC inputs to minimize trace capacitance-induced settling errors. Per the ADI datasheet, 16-bit settling is more stringent than typical op-amp 0.1% specs, so verify the driver's 16-bit settling time before finalizing BOM selection.
Estimated: When sharing REF between multiple channels or ADCs, treat the reference pin as an output stage and place an ADI-recommended ADR01/ADR02 buffer rather than directly paralleling ADC REF pins, otherwise one ADC's transient reference current will inject crosstalk into other channels. Do not oversize the input RC filter - per the ADI AD7655 datasheet, the input bandwidth to the T/H is approximately 60 MHz at -3 dB and large RC values will degrade settling at 1 MSPS. Finally, verify CONVST timing matches the datasheet timing diagram - if CS, READ, and CONVST signals are not properly sequence-set, the BUSY output timing will shift and SPI readouts will misalign with conversion results.
Estimated: At simultaneous 1 MSPS on all 4 channels with 5 V AVDD, the AD7655ACPZRL dissipates approximately 130 mW typical from AVDD plus 30 mW from DVDD - well within the LFCSP-VQ 7x7 thermal pad's dissipation capacity (theta-JA approx 28 C/W with proper via-array ground pad). At 85C ambient the junction rises ~5C, leaving thermal headroom for hot environments. However if the same design accepts 6 V AVDD over-voltage (not recommended) or runs in a fully-sealed enclosure, monitor PCB plane temperature near the exposed pad and verify staying below the 150C absolute maximum junction rating. The 4x4 thermal via array is essential for reliable operation.
Compliance Information
RoHS and REACH compliance verified on the Analog Devices AD7655 product page. Not AEC-Q100 qualified - for automotive-grade applications, alternative parts in the ADI PulSAR family should be evaluated.