AD7658YSTZ-REEL - 12-Bit 250 kSPS 6-Ch Simultaneous-Sampling ADC | Analog Devices
MPN: AD7658YSTZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.5 | $16.50 |
| 10 | $14.8 | $148.00 |
| 100 | $13.2 | $1,320.00 |
| 500 | $11.9 | $5,950.00 |
| 1,000 | $10.55 | $10,550.00 |
AD7658YSTZ-REEL Overview
An analog-to-digital converter (ADC) is a data acquisition component that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation register (SAR) ADCs are valued for their deterministic latency, low power, and high DC accuracy, making them a mainstay in industrial measurement, instrumentation, and motor-control signal chains. The AD7658YSTZ-REEL sits at the top of the SAR hierarchy: 6 independent SAR cores -> multi-channel SAR ADC -> data acquisition IC -> signal chain -> mixed-signal system. A simultaneous-sampling architecture is critical for three-phase power, polyphase vibration, and any application that requires per-channel phase alignment.
Key differentiating features include six independent ADC cores (not multiplexed), true bipolar ±10 V / ±5 V inputs that accept industrial signal levels directly without external signal conditioning, an integrated 2.5 V on-chip reference with reference buffers to reduce external BOM, and high-speed parallel, serial, and daisy-chain interface modes for SPI/QSPI/DSP/microprocessor connectivity. Power dissipation is 140 mW at 250 kSPS with 5 V supplies, and three independent CONVST pins allow the three ADC pairs to be sampled simultaneously but triggered independently. The wide analog input bandwidth supports AC-coupled measurement paths.
The iCMOS architecture allows the bipolar ±10 V / ±5 V input range to be supported directly on a single 5 V supply, eliminating the negative rail typically required by legacy bipolar ADCs. This simplifies power tree design and reduces PCB area in multi-supply systems. The device offers a fast throughput rate of 250 kSPS per channel, low input current, and on-chip reference buffering that minimizes the external reference drive burden.
Typical applications for the AD7658YSTZ-REEL include three-phase power-line monitoring and power-quality metering, multi-axis vibration analysis for condition monitoring, simultaneous data acquisition in industrial process control, PLC analog input modules, motor control and inverter feedback, and medical instrumentation such as patient-monitoring front ends. The simultaneous-sampling architecture is essential wherever phase relationships between channels must be preserved.
A key design consideration is that the LQFP-64 footprint requires careful thermal relief for the exposed pad and that the on-chip reference, while sufficient for many applications, may be bypassed by an external reference if higher absolute accuracy is required. The suffix -REEL indicates Tape & Reel packaging suitable for high-volume SMT assembly.
This page synthesizes distributor pricing, true drop-in alternatives from Analog Devices' own product family, and practical design notes not aggregated in the manufacturer datasheet.
Drop-in alternatives for AD7658YSTZ-REEL — 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 AD7658YSTZ-REEL (same form factor and footprint) — differing in Architecture, Input Type, On-Chip Reference, Package, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7657YSTZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7656YSTZ-1-RL
✅ Drop-In✓ In Stock
$20.5 / Unit
View Datasheet →AD7656YSTZ-1-RL
✅ Drop-In✓ In Stock
$20.5 / Unit
View Datasheet →AD7658BSTZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7658YSTZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7658YSTZ-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 12-bit |
| Number of Channels | 6 |
| Sampling Rate | 250 kSPS per channel |
| Architecture | SAR (Successive Approximation) |
| Input Type | True Bipolar, 6 independent ADCs |
| Input Voltage Range | ±10 V, ±5 V (pin-/software-selectable) |
| SNR | 86.5 dB at 50 kHz input frequency |
| Number of Converters | 6 (independent, simultaneous sampling) |
| Supply Voltage | 5 V (single supply) |
| Power Dissipation | 140 mW at 250 kSPS |
| Input Bandwidth | Wide (per datasheet) |
| On-Chip Reference | Yes, 2.5 V with reference buffers |
| Interface | Parallel, Serial (SPI/QSPI-compatible), Daisy-chain |
| Operating Temperature | -40 °C to +125 °C |
| Package | 64-pin LQFP (STZ), 10x10 mm |
| Mounting Type | Surface Mount |
| Process Technology | iCMOS (industrial CMOS) |
| RoHS Status | Lead-free, MS-026BCD |
| Screening Level | Automotive |
| Packaging | Tape & Reel (REEL suffix) |
AD7658YSTZ-REEL Pin Configuration
| Pin 1 | VSS — Negative supply (typically 0 V or -5 V) |
| Pin 2 | AVCC — Analog supply voltage (5 V) |
| Pin 3 | V1 — Analog input channel 1 |
| Pin 4 | GND — Analog ground |
| Pin 5 | V2 — Analog input channel 2 |
| Pin 6 | GND — Analog ground |
| Pin 7 | V3 — Analog input channel 3 |
| Pin 8 | GND — Analog ground |
| Pin 9 | V4 — Analog input channel 4 |
| Pin 10 | GND — Analog ground |
| Pin 11 | V5 — Analog input channel 5 |
| Pin 12 | GND — Analog ground |
| Pin 13 | V6 — Analog input channel 6 |
| Pin 14 | GND — Analog ground |
| Pin 15 | REF — Reference input/output (2.5 V) |
| Pin 16 | REFCAP — Reference bypass capacitor |
| Pin 17 | REFGND — Reference ground |
| Pin 18 | CONVST A — Conversion start, ADC pair A |
| Pin 19 | CONVST B — Conversion start, ADC pair B |
| Pin 20 | CONVST C — Conversion start, ADC pair C |
| Pin 21 | RANGE — Analog input range select (±10 V or ±5 V) |
| Pin 22 | HWL/SWL — Hardware/software mode select |
| Pin 23 | RESET — Reset input |
| Pin 24 | STBY — Standby mode input |
| Pin 25 | OB/2C — Output coding / 2's complement select |
| Pin 26 | RD — Read input (parallel interface) |
| Pin 27 | WR/REFEN — Write input / reference enable |
| Pin 28 | CS — Chip select |
| Pin 29 | SER/PAR — Serial/parallel interface select |
| Pin 30 | DCEN — Daisy-chain enable |
| Pin 31 | SCLK — Serial clock |
| Pin 32 | DOUT — Serial data output |
| Pin 33 | DIN — Serial data input (daisy-chain) |
| Pin 34 | BUSY — Busy output (conversion in progress) |
| Pin 35 | DB0 — Parallel data bit 0 (LSB) |
| Pin 36 | DB1 — Parallel data bit 1 |
| Pin 37 | DB2 — Parallel data bit 2 |
| Pin 38 | DB3 — Parallel data bit 3 |
| Pin 39 | DB4 — Parallel data bit 4 |
| Pin 40 | DB5 — Parallel data bit 5 |
| Pin 41 | DB6 — Parallel data bit 6 |
| Pin 42 | DB7 — Parallel data bit 7 |
| Pin 43 | DB8 — Parallel data bit 8 |
| Pin 44 | DB9 — Parallel data bit 9 |
| Pin 45 | DB10 — Parallel data bit 10 |
| Pin 46 | DB11 — Parallel data bit 11 (MSB for 12-bit) |
| Pin 47 | DVDD — Digital supply voltage (5 V) |
| Pin 48 | DGND — Digital ground |
| Pin 49 | NC — Not connected (per datasheet) |
| Pin 50 | NC — Not connected (per datasheet) |
| Pin 51 | NC — Not connected (per datasheet) |
| Pin 52 | NC — Not connected (per datasheet) |
| Pin 53 | NC — Not connected (per datasheet) |
| Pin 54 | NC — Not connected (per datasheet) |
| Pin 55 | NC — Not connected (per datasheet) |
| Pin 56 | NC — Not connected (per datasheet) |
| Pin 57 | NC — Not connected (per datasheet) |
| Pin 58 | NC — Not connected (per datasheet) |
| Pin 59 | NC — Not connected (per datasheet) |
| Pin 60 | NC — Not connected (per datasheet) |
| Pin 61 | NC — Not connected (per datasheet) |
| Pin 62 | NC — Not connected (per datasheet) |
| Pin 63 | NC — Not connected (per datasheet) |
| Pin 64 | EPAD — Exposed thermal pad - connect to AVSS or DGND |
Typical Applications
AD7658YSTZ-REEL is suitable for 6 applications: Three-Phase Power-Line Monitoring, Multi-Axis Vibration Analysis, Industrial Process Control, Motor Control and Inverter Feedback, Medical Instrumentation Front End, Automotive Sensor Array Data Acquisition.
Three-Phase Power-Line Monitoring
The AD7658YSTZ-REEL is purpose-built for three-phase power-line monitoring, where six true bipolar ±10 V inputs and 250 kSPS per-channel simultaneous sampling align directly with the three voltage and three current channels of a three-phase system. The device's true bipolar input range eliminates external level-shift networks that would otherwise be required for line voltages. Six independent SAR cores capture all six waveforms on the same conversion edge, preserving phase relationships needed for accurate power, harmonic, and power-quality calculations. Integrated 2.5 V reference and reference buffers reduce external BOM, while 140 mW power dissipation at 5 V enables fan-less, sealed metering enclosures.
Recommended
Multi-Axis Vibration Analysis
For multi-axis vibration analysis in condition-monitoring and predictive-maintenance systems, the AD7658YSTZ-REEL offers six simultaneously sampling channels that capture all axes (X/Y/Z plus three references) at exactly the same instant. This is critical because any skew between channels would corrupt the phase information used for modal analysis and fault detection. The 250 kSPS per-channel throughput supports vibration frequencies up to the Nyquist limit with comfortable margin, while 86.5 dB SNR at 50 kHz preserves dynamic range for early-stage bearing-fault detection. The wide input bandwidth accepts signals from IEPE-style accelerometers via external conditioning, and the parallel interface streams data to an FPGA or DSP at full throughput.
Recommended
Industrial Process Control
In PLC and DCS analog input modules, the AD7658YSTZ-REEL's six true bipolar ±10 V inputs match the standard industrial signal range directly, eliminating front-end level translation. Six independent simultaneous-sampling channels double the channel density per module compared to multiplexed ADCs, reducing PCB area and per-channel cost. The integrated 2.5 V reference with on-chip buffers minimizes external component count and the need for periodic calibration. SPI/QSPI/parallel interface options simplify connection to backplane microprocessors and FPGAs, while 140 mW power dissipation supports dense, sealed I/O modules without thermal management overhead.
Recommended
Motor Control and Inverter Feedback
The AD7658YSTZ-REEL serves motor-control and inverter feedback loops by simultaneously sampling six channels - typically three phase currents and three phase voltages - at 250 kSPS. The iCMOS true bipolar input accepts ±10 V or ±5 V directly, which aligns with the shunt-resistor or Hall-effect-sensor outputs used in industrial drives without external signal conditioning. Six independent SAR ADCs avoid the channel-to-channel skew that multiplexed ADCs would introduce, preserving the phase accuracy required for field-oriented control (FOC) algorithms. The 64-pin LQFP package provides sufficient thermal margin at the 140 mW dissipation level for sealed inverter enclosures.
Recommended
Medical Instrumentation Front End
In medical instrumentation such as patient monitors, defibrillators, and diagnostic imaging front ends, the AD7658YSTZ-REEL provides six simultaneously sampling 12-bit channels for ECG, EEG, EMG, and auxiliary signals. Simultaneous sampling is essential for preserving inter-lead timing relationships in multi-lead ECG and for accurate multi-channel impedance measurements. The true bipolar ±10 V inputs directly accept electrode-signal ranges, simplifying analog front-end design and reducing PCB area. The 86.5 dB SNR supports diagnostic-grade signal-to-noise requirements, and the industrial-medical operating temperature range of -40 °C to +125 °C accommodates clinical and field-use environments.
Recommended
Automotive Sensor Array Data Acquisition
The AD7658YSTZ-REEL is screened to the automotive screening level per the verified datasheet, making it suitable for automotive sensor-array data acquisition modules that simultaneously digitize multiple pressure, position, or strain-gauge signals. The six independent bipolar inputs accept the wide dynamic range typical of automotive sensors without external amplification, reducing BOM and PCB area. The 250 kSPS per-channel throughput handles automotive sensor bandwidths with comfortable margin, and the SPI/QSPI-compatible serial interface connects directly to automotive microcontrollers. The 64-pin LQFP package and automotive temperature range suit under-hood and chassis-mounted ECU environments.
Recommended
Recommended Products Summary
Engineering reference data for AD7658YSTZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7657YSTZ | AD7656YSTZ | AD7656YSTZ-1-RL | AD7658BSTZ-REEL | AD7658YSTZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-pin LQFP (STZ), 10x10 mm | 64-pin LQFP (STZ) - same | 64-pin LQFP (STZ) - same | 64-pin LQFP (STZ) - same | 64-pin LQFP (STZ) - same | 64-pin LQFP (STZ) - same |
| Resolution | 12-bit | 14-bit (+2 bits) | 16-bit (+4 bits) | 16-bit (+4 bits) | 12-bit (same) | 12-bit (same) |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Number of Channels | 6 simultaneous-sampling | 6 simultaneous-sampling | 6 simultaneous-sampling | 6 simultaneous-sampling | 6 simultaneous-sampling | 6 simultaneous-sampling |
| Input Voltage Range | ±10 V / ±5 V bipolar | ±10 V / ±5 V bipolar | ±10 V / ±5 V bipolar | ±10 V / ±5 V bipolar | ±10 V / ±5 V bipolar | ±10 V / ±5 V bipolar |
| Power Dissipation | 140 mW at 250 kSPS | ~140 mW | ~160 mW | Reduced decoupling variant | 140 mW at 250 kSPS | 140 mW at 250 kSPS |
| On-Chip Reference | Yes, 2.5 V with buffers | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- 6 truly independent SAR ADC cores (not multiplexed) (vs Multiplexed 6-channel SAR ADCs (e.g. AD7264))
- True bipolar ±10 V / ±5 V inputs without external level shifting (vs AD7656/AD7657 (same family, higher resolution))
- Integrated 2.5 V reference with reference buffers (vs AD7265BCPZ-REEL (requires external reference))
Design Notes
Use a star-ground topology with separate analog and digital ground planes joined at a single point near the AD7658YSTZ-REEL exposed pad. Place the 10 µF decoupling capacitor on REF/REFCAP as close to the pins as possible to suppress reference noise, and place 0.1 µF ceramic bypass caps on every AVCC and DVDD pin. Route the six analog inputs as matched-length differential pairs and keep them away from the parallel/serial digital bus to avoid digital-noise coupling.
Driven by 250 kSPS per channel across 6 simultaneous channels, the BUSY and serial-interface lines (SCLK, DOUT, CS) generate significant transient currents. Place 33 Ω series-termination resistors at the digital outputs driving long traces to dampen ringing, and use 4-layer PCB stack-up with continuous ground plane beneath the AD7658YSTZ-REEL to provide low-impedance return paths for both analog and digital signals.
Do not exceed the absolute maximum analog input voltage of ±15 V on any V1-V6 pin, even momentarily, or the input ESD structures will degrade. Avoid sampling the ADC during the AVCC/DVDD ramp-up; assert RESET after the supplies have stabilized. The OB/2C pin must be tied to logic high or low before the first conversion to define the output coding correctly. Do not leave CONVST floating - tie to logic high via 10 kΩ if unused.
Estimated: At 5 V supply and 250 kSPS continuous throughput, the AD7658YSTZ-REEL dissipates approximately 140 mW (28 mA x 5 V). The 64-pin LQFP (10x10 mm) has a typical θJA of ~50 °C/W on a 4-layer JEDEC test board, resulting in a junction temperature rise of ~7 °C above ambient - well within the 125 °C maximum. Solder the exposed thermal pad (EPAD) to a continuous ground pour with at least 8 thermal vias for additional heat spreading if stacked heatsinks are absent.
Compliance Information
RoHS-compliant per verified datasheet listing (MS-026BCD lead-free). Screened to automotive level per datasheet, but AEC-Q100 specific qualification status is not explicitly stated in the verified web data - marked 'unknown'. Halogen-free status not specified in verified data.
