AD7875LPZ-REEL - 12-Bit 100kHz Sampling ADC | Analog Devices
MPN: AD7875LPZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.05 | $220.50 |
| 100 | $19.6 | $1,960.00 |
| 500 | $17.64 | $8,820.00 |
| 1,000 | $15.68 | $15,680.00 |
AD7875LPZ-REEL Overview
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes, enabling microcontrollers, DSPs, and processors to interpret real-world signals. The AD7875 belongs to the successive-approximation-register (SAR) ADC category, which uses an iterative binary-search algorithm with an internal DAC to perform each conversion in a fixed number of clock cycles. SAR ADCs sit within the broader data-converter family, alongside delta-sigma and pipeline architectures, and are favored for multi-channel multiplexed and DC/front-end signal acquisition where deterministic latency and low latency are critical.
Key features include a 2 µs acquisition track-and-hold front end, 8 µs A/D conversion time, on-chip 2.5 V buried-zener reference laser-trimmed for accuracy, 72 dB SNR at 10 kHz input, ±5 V dual analog supply operation, and three interface modes (12-bit parallel, 8-bit byte, and serial). The 28-terminal J-lead surface-mount package (QCCJ / PLCC) is rated for the commercial 0 °C to +70 °C temperature grade and ships in tape-and-reel format for high-volume assembly.
Architecturally, the AD7875 integrates an analog input multiplexer/amplifier, the SAR core, internal reference, clock oscillator, and a flexible digital interface on a single CMOS die. The laser-trimmed buried-zener reference and clock remove two of the largest external bill-of-materials items typical of discrete 12-bit ADC designs, shrinking PCB area and improving long-term gain stability.
Typical applications include industrial process control front ends, multichannel data-acquisition boards, motor-control feedback loops (shaft position, current sense), and instrumentation signal inputs where 12-bit resolution and 100 kSPS throughput are sufficient. The on-chip reference also makes the part attractive for portable or space-constrained designs where an external reference would be impractical.
When designing with the AD7875, choose the supply range carefully: ±5 V supplies yield best SNR at the expense of higher power dissipation, while ±3 V operation reduces power at slightly lower dynamic performance. Decouple both AVdd and DVdd pins with 0.1 µF ceramic capacitors placed within 5 mm of the package to keep digital switching noise out of the analog front end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not available in the bare manufacturer datasheet, providing engineers with a single reference point for sourcing and second-sourcing decisions.
Drop-in alternatives for AD7875LPZ-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 AD7875LPZ-REEL (same form factor and footprint) — differing in Architecture, On-Chip Reference, Package, Track-and-Hold Acquisition Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7875KPZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7875LP
✅ Drop-In📋 Reference alternative (not in catalog)
AD7875KNZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7875KRZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7875KRZ-REEL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7875LPZ-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Number of Channels | 1 input, 1 SAR |
| Sampling Rate | 100 kSPS |
| Conversion Time | 8 µs |
| Track-and-Hold Acquisition Time | 2 µs |
| Architecture | Successive Approximation (SAR) |
| Input Voltage Range | 0 V to 5 V |
| Analog Supply Voltage | ±5 V (dual supply) |
| Digital Supply Voltage | +5 V |
| On-Chip Reference | Yes, 2.5 V laser-trimmed buried Zener |
| SNR | 72 dB at 10 kHz input |
| Integral Nonlinearity (EL) | 0.0244% (1 LSB max, typical) |
| Digital Interface | Parallel (12-bit), byte (8-bit), serial |
| Internal Clock | Yes, laser-trimmed |
| Package | 28-Pin PLCC (LCCC, MO-047AB, LCC-28) |
| Terminal Form | J-Bend (QCCJ) |
| Operating Temperature | 0 °C to +70 °C (Commercial) |
| Screening Level | Commercial |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD7875LPZ-REEL Pin Configuration
| Pin 1 | VSS — Negative analog supply (-5 V typical) |
| Pin 2 | REF OUT/REF IN — Internal 2.5 V reference output / external reference input |
| Pin 3 | AGND — Analog ground |
| Pin 4 | AIN — Analog input (0 V to 5 V range) |
| Pin 5 | VSS — Negative analog supply (-5 V typical) |
| Pin 6 | VDD — Positive analog supply (+5 V typical) |
| Pin 7 | DB11 (MSB) — Data Bit 11 / serial-data out option |
| Pin 8 | DB10 — Data Bit 10 |
| Pin 9 | DB9 — Data Bit 9 |
| Pin 10 | DB8 — Data Bit 8 / HBE for byte mode |
| Pin 11 | DB7 — Data Bit 7 |
| Pin 12 | DB6 — Data Bit 6 |
| Pin 13 | DB5 — Data Bit 5 |
| Pin 14 | DB4 — Data Bit 4 |
| Pin 15 | DB3 — Data Bit 3 |
| Pin 16 | DB2 — Data Bit 2 |
| Pin 17 | DB1 (LSB) — Data Bit 1 (LSB) |
| Pin 18 | STBY — Standby (active low) |
| Pin 19 | RFS — Read-frame sync for serial mode |
| Pin 20 | TFS — Transmit-frame sync for serial mode |
| Pin 21 | SCLK — Serial clock |
| Pin 22 | CLK — Master clock input |
| Pin 23 | MODE — Mode select (parallel/byte/serial) |
| Pin 24 | BUSY — Status (BUSY signal during conversion) |
| Pin 25 | CS — Chip select (active low) |
| Pin 26 | RD — Read input (active low) |
| Pin 27 | WR — Write / convert start (active low) |
| Pin 28 | DVDD — Digital +5 V supply |
Typical Applications
AD7875LPZ-REEL is suitable for 6 applications: Industrial Process Control Front End, Data Acquisition Boards, Motor Control Feedback Loops, Instrumentation and Test Equipment, Medical Patient Monitoring, Communication Signal Monitoring.
Industrial Process Control Front End
The AD7875LPZ-REEL fits industrial process-control front-ends thanks to its 12-bit resolution at 100 kSPS, enabling simultaneous sampling of multiple 4-20 mA loop signals after external scaling. The on-chip 2.5 V reference removes drift concerns in 24-bit-rated instrument loops, while the SAR architecture provides deterministic 8 µs conversion time for closed-loop control updates. Per the AD7875 datasheet, ±5 V supplies yield 72 dB SNR at 10 kHz, preserving loop accuracy across plant temperatures.
Recommended
Data Acquisition Boards
Multichannel data-acquisition boards leverage the AD7875LPZ-REEL's 100 kSPS throughput and parallel/byte/serial interface to deliver 12-bit precision for vibration, strain-gauge, and transducer digitisation. The 2 µs acquisition track-and-hold plus 8 µs conversion cycle yields an aggregate throughput of 100,000 samples per second, suitable for IEEE 1242-class PC-based DAQ plug-in cards. On-chip reference eliminates an external reference IC, shrinking BOM for dense multiplexed boards.
Recommended
Motor Control Feedback Loops
Closed-loop motor control requires deterministic, low-latency current and position sensing, and the AD7875LPZ-REEL's SAR architecture provides exactly that with no pipeline delay. The 8 µs conversion time supports PWM frequencies up to ~50 kHz, enabling Field-Oriented Control (FOC) feedback for BLDC and PMSM drives. The on-chip reference ensures gain stability over the operating-temperature range, which is critical for precise torque control in servo amplifiers.
Recommended
Instrumentation and Test Equipment
Bench-top multimeters, oscilloscope front-ends, and laboratory instruments benefit from the AD7875LPZ-REEL's 72 dB SNR at 10 kHz input bandwidth, equivalent to 11.7 effective bits, sufficient for ±0.05% accuracy in voltmeter and ohmmeter functions. The 12-bit resolution delivers 1 part-in-4096 discrimination, while the on-chip reference simplifies calibration procedures. Engineers building portable instruments appreciate the single-IC integration that reduces calibration-cycle time and PCB area.
Recommended
Medical Patient Monitoring
Patient-monitoring equipment such as bedside monitors and ambulatory ECG recorders rely on the AD7875LPZ-REEL for 12-bit 100 kSPS digitisation of analog front-end signals amplified from electrode leads. The SAR architecture produces no pipeline latency, allowing immediate triggering on QRS detection for heart-rate calculation. The on-chip reference minimises long-term drift, supporting battery-powered medical devices that must hold calibration for multi-year service intervals.
Recommended
Communication Signal Monitoring
Base-station RF power monitors, antenna VSWR sensing, and trunked-radio diagnostics use the AD7875LPZ-REEL for 12-bit digitisation of log-detector outputs, providing ±0.5 dB dynamic range per LSB. The 100 kSPS throughput captures modulation envelopes for telemetry and diagnostic uplinks without excessive oversampling. The on-chip reference stabilises the gain across temperature swings typical of outdoor cabinet installations.
Recommended
Recommended Products Summary
Engineering reference data for AD7875LPZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7875KPZ-REEL | AD7875LP | AD7875KNZ | AD7875KRZ | AD7875KRZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-Pin PLCC (LCC-28, MO-047AB) | 28-Pin PLCC (LCC-28, MO-047AB) - same | 28-Pin PLCC (LCC-28, MO-047AB) - same | 28-Pin PLCC (LCC-28, MO-047AB) - same | 28-Pin PLCC (LCC-28, MO-047AB) - same | 28-Pin PLCC (LCC-28, MO-047AB) - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Analog Supply | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V |
| On-Chip Reference | Yes, 2.5 V laser-trimmed | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | 0 °C to +70 °C (Commercial) | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C |
| Conversion Time | 8 µs | 8 µs | 8 µs | 8 µs | 8 µs | 8 µs |
| Pin-Count / Footprint | 28-pin / 11.51×11.51 mm | 28-pin / same | 28-pin / same | 28-pin / same | 28-pin / same | 28-pin / same |
| Cost Tier (qty 1) | $24.50 | Similar tier | Similar tier | Similar tier | Similar tier | Similar tier |
Key Differentiators
- Pin-compatible with full AD7875 family (LPZ/KPZ/LP/KN/KR) for second-sourcing (vs AD7875KPZ-REEL)
- Completely integrated ADC IC - no external reference required (vs Discrete 12-bit ADCs (e.g., AD574A + external 2.5 V reference))
- Three-interface flexibility on a single device (parallel/byte/serial) (vs AD7478AAKSZ (SPI-only))
Design Notes
Decouple each analog and digital supply pin with a 0.1 µF ceramic capacitor placed within 5 mm of the package, and add a 10 µF tantalum bulk capacitor near each supply rail. Per the AD7875 datasheet, AVdd and AVss should be low-noise linear regulators (e.g., ±5 V LDO pair), not switching converters, to achieve the datasheet's 72 dB SNR. Critical: switching noise on the analog supply will couple into the SAR comparator and ruin conversions.
Route analog and digital grounds on a single low-impedance split-AGND/DGND plane with a single star-connection under the IC; this prevents ground-loop noise in the SAR comparator. Estimated: a 4-layer PCB with 0.5 oz copper on the analog layer and 1 oz on the power layer yields ~10 mΩ/sq plane resistance, which is acceptable for the AD7875's 100 kSPS throughput. Place the input buffer op-amp within 5 mm of AIN to minimise trace capacitance.
Do not operate the analog input above Vdd + 0.3 V or below Vss - 0.3 V; out-of-range inputs latch the ESD diodes and degrade linearity. Critical: ensure the BUSY signal is sampled by the host before reading data; otherwise the host reads garbage during an active conversion. Tie MODE pin to the correct logic level before powering up, since mid-level voltage can put the part in undefined interface mode.
For best SNR, drive the analog input from a low-impedance (<100 Ω) buffer op-amp such as the AD8628 or OP177 to avoid kickback noise from the AD7875's switched-capacitor input structure. Recommended: place a 100 Ω series resistor and a 100 pF shunt capacitor at the AIN pin to form a 16 MHz low-pass filter, attenuating RF interference without affecting the 100 kSPS baseband signal.
Compliance Information
RoHS compliant per manufacturer product page. Commercial temperature grade (0 °C to +70 °C) per datasheet screening-level field. Not AEC-Q100 qualified; this part targets industrial and instrumentation rather than automotive applications.
