AD7495ARMZ-REEL - 12-Bit 1MSPS SAR ADC | Analog Devices
MPN: AD7495ARMZ-REEL ✓ Hoạt độngAD7495ARMZ-REEL Tóm tắt
An SAR ADC is a successive-approximation-register analog-to-digital converter, a type of data converter that uses a binary search algorithm through an internal capacitive DAC to resolve each analog sample into a digital code in N conversion cycles. In the broader taxonomy, an SAR ADC sits below sigma-delta and pipeline ADCs in the precision/speed hierarchy: it offers medium resolution (typically 8 to 18 bits) and medium-to-high speed (100 kSPS to several MSPS) with very low latency and zero pipeline delay, making it ideal for multiplexed data acquisition, motor control feedback loops, and instrumentation where deterministic sampling matters more than absolute DC accuracy.
Key features of the AD7495ARMZ-REEL include a low-noise wide-bandwidth track-and-hold amplifier, an on-chip 2.5 V reference, flexible VDRIVE logic supply, and SPI/QSPI/MICROWIRE/DSP-compatible serial interface. According to manufacturer characterization, the part consumes only 4.5 mW at 1 MSPS with a 3 V supply and 10.5 mW at 1 MSPS with a 5 V supply, with 70 dB signal-to-noise ratio and wide input bandwidth that supports full-scale input ranges from 0 V to VDD.
The architecture is a charge-redistribution SAR with a high-impedance analog input stage that accepts unipolar single-ended inputs of 0 V to 2.5 V (when using the internal reference) or 0 V to VDD (when using an external reference). The internal reference is a low-drift 2.5 V bandgap, and the VDRIVE pin sets the logic output voltage independently of the analog supply, allowing direct connection to 1.8 V, 3 V, or 5 V microcontrollers without level shifters.
Typical applications include industrial process control loops, multi-channel data acquisition systems, portable and battery-powered instrumentation, optical sensor front-ends, and motor-control current/voltage feedback. In each of these, the AD7495ARMZ-REEL provides deterministic 1 MSPS sampling, low power consumption under 11 mW, and a small MSOP-8 footprint that simplifies board layout.
When designing with this ADC, size the input RC antialiasing filter around the track-and-hold acquisition time rather than the conversion time, and add a 1 nF to 10 nF ceramic bypass capacitor on VDD placed within 5 mm of the supply pin. The internal reference requires a 10 uF decoupling capacitor on the REFIN/REFOUT pin for noise performance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho AD7495ARMZ-REEL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7495ARMZ-REEL (cùng hình factor và footprint) — khác nhau ở Digital Interface, Internal Reference Voltage, Number of Channels, Operating Temperature, Package.
AD7495ARMZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7495ARM-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7495ARMZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7475ARMZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7475ARMZ-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7495ARMZ-REEL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Sample Rate | 1 MSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 input, 1 SAR |
| Supply Voltage (VDD) | 2.7 V to 5.25 V |
| Logic I/O Supply (VDRIVE) | 2.7 V to 5.25 V |
| Phạm vi điện áp đầu vào | 0 V to 2.5 V (internal ref) / 0 V to VDD (external ref) |
| Internal Reference Voltage | 2.5 V (on-chip) |
| Signal-to-Noise Ratio (SNR) | 70 dB |
| Power Consumption at 3 V / 1 MSPS | 4.5 mW (typ) |
| Power Consumption at 5 V / 1 MSPS | 10.5 mW (typ) |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP-compatible serial |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 8-pin MSOP (RM-8, MO-187-AA) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited at floor life <30 C / 85% RH) |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7495ARMZ-REEL
| Chân 1 | VDD — Analog supply voltage (2.7 V to 5.25 V) |
| Chân 2 | VDRIVE — Logic I/O supply voltage (sets DOUT logic level) |
| Chân 3 | GND — Ground (analog and digital return) |
| Chân 4 | REF IN/REF OUT — 2.5 V internal reference output / external reference input |
| Chân 5 | AIN — Analog input (0 V to 2.5 V or 0 V to VDD) |
| Chân 6 | GND — Ground |
| Chân 7 | CS / SCLK — Chip select / Serial clock input (per FindIC summary; refer to datasheet) |
| Chân 8 | DOUT — Serial data output (SPI-compatible) |
Ứng dụng tiêu biểu
AD7495ARMZ-REEL phù hợp cho 6 Áp dụngs: Industrial Process Control Loops, Portable Battery-Powered Instrumentation, Multi-Channel Data Acquisition Systems, Motor Control Current and Voltage Feedback, Optical Sensor Front-End Digitization, Audio Bandwidth Digitization and DSP Front-End.
Industrial Process Control Loops
The AD7495ARMZ-REEL fits industrial process-control loops because its 1 MSPS deterministic SAR conversion delivers 12-bit feedback at millisecond rates required by 4-20 mA loop reconstruction and PID valve control. With 70 dB SNR and 2.5 V internal reference, the part resolves 0.6 mV steps over the 0-2.5 V input span, sufficient for thermocouple and bridge-sensor conditioning. The 8-MSOP footprint enables dense multi-channel DIN-rail analog front ends. Power dissipation of 10.5 mW at 5 V keeps the part within the thermal budget of sealed IP67 field enclosures. Compared to sigma-delta ADCs, the zero-latency SAR conversion eliminates loop dead time that would otherwise degrade PID response.
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Portable Battery-Powered Instrumentation
The AD7495ARMZ-REEL is well suited to battery-powered handheld instruments because of its 4.5 mW dissipation at 3 V and 1 MSPS, roughly one-third the consumption of comparable pipeline ADCs. The integrated 2.5 V reference removes the need for an external reference IC that would otherwise drain 1-3 mA of quiescent current. The wide 2.7 V to 5.25 V supply range lets a single design run from a Li-ion cell (3.7 V nominal) or two AA cells in series (3 V). The 8-MSOP package occupies just 9 mm² of board area, ideal for compact handheld enclosures. Compared to higher-speed ADCs, the deterministic 1 MSPS sampling preserves low-power idle states between sample bursts.
Được đề xuất
Multi-Channel Data Acquisition Systems
The AD7495ARMZ-REEL suits multi-channel data-acquisition systems that require deterministic, low-latency sampling across several analog inputs. While the part itself is single-channel, the SPI-compatible serial interface supports daisy-chaining multiple ADCs on one serial bus, allowing 4 or 8 channels to share one microcontroller SPI peripheral. The VDRIVE pin sets output logic levels independently of analog VDD, connecting directly to 3 V or 1.8 V microcontrollers without level shifters. The 8-MSOP footprint lets designers place one ADC per analog input channel in a compact star pattern, preserving signal integrity better than multiplexer-based architectures. According to the manufacturer datasheet, throughput remains 1 MSPS per converter when daisy-chained.
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Motor Control Current and Voltage Feedback
The AD7495ARMZ-REEL is well matched to motor-control feedback loops where deterministic SAR conversion is critical for the FOC (field-oriented control) update cycle. With 1 MSPS throughput and zero pipeline delay, the part samples phase currents at the PWM rate without introducing lag that would destabilize the current loop. The 2.5 V input span matches the output of common current-shunt amplifiers such as the AD8418 after scaling. The 8-MSOP package fits within the tight PCB envelope of integrated motor-drive modules, and the -40 C to +85 C industrial temperature range covers servo-drive environments. Compared to sigma-delta converters, the SAR architecture eliminates the latency penalty that complicates digital current-loop compensation.
Được đề xuất
Optical Sensor Front-End Digitization
The AD7495ARMZ-REEL provides 12-bit, 1 MSPS digitization at the front end of optical-sensor applications including photodiode current readout, color-sensor colorimetric measurement, and ambient-light sensing. The wide input bandwidth of the track-and-hold amplifier preserves the fast edges of pulsed photodiode signals, while the 70 dB SNR floor resolves intensity steps below 0.5% of full scale. The on-chip 2.5 V reference provides a stable conversion baseline against temperature variation, important when optical filters shift wavelength peaks across the operating range. The 8-MSOP footprint enables compact sensor modules. Designers typically add a transimpedance amplifier such as the AD8015 in front of the ADC input.
Được đề xuất
Audio Bandwidth Digitization and DSP Front-End
The AD7495ARMZ-REEL handles audio-bandwidth digitization up to 1 MSPS for systems such as digital audio mixing consoles, spectrum-analyzer front-ends, and class-D amplifier feedback. With 70 dB SNR, the part provides roughly 11.5 ENOB (effective number of bits) - sufficient for line-level audio where dynamic range targets are 80-90 dB after gain staging. The deterministic SAR conversion eliminates group delay that would smear transient audio edges. The VDRIVE pin simplifies interfacing to audio DSP chips such as the ADAU1781 or SHARC processors. Designers should follow datasheet recommendations on input antialiasing RC component selection to preserve the 70 dB SNR floor across the audio band.
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Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7495ARMZ-REEL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD7495ARMZ-REEL7 | AD7495ARM-REEL | AD7495ARMZ | AD7475ARMZ-REEL7 | AD7475ARMZ-REEL |
|---|---|---|---|---|---|---|
| Package | 8-MSOP (RM-8) | 8-MSOP (RM-8) - same | 8-MSOP (RM-8) - same | 8-MSOP (RM-8) - same | 8-MSOP (RM-8) - same | 8-MSOP (RM-8) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Internal Reference | Yes (2.5 V on-chip) | Yes (2.5 V on-chip) | Yes (2.5 V on-chip) | Yes (2.5 V on-chip) | No (external 2.5 V required) | No (external 2.5 V required) |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| RoHS Status | Compliant | Compliant | Non-compliant (lead-based) | Compliant | Compliant | Compliant |
Bảo phân biệt quan trọng
- On-chip 2.5 V reference eliminates external ref BOM (vsAD7475ARMZ-REEL7)
- VDRIVE logic supply independent of analog VDD (vsAD7475 family (same family))
- 1 MSPS with deterministic zero-latency SAR architecture (vsSigma-delta ADCs at similar speed)
Ghi chú thiết kế
Place the 10 uF REFIN/REFOUT decoupling capacitor within 5 mm of pin 4 using a low-ESR ceramic X5R or X7R dielectric. Add a 100 nF high-frequency bypass in parallel. The VDD and VDRIVE pins each need a 1 nF to 10 nF decoupling capacitor within 3 mm. Use a single ground plane with analog and digital sections split only at the ADC ground pin (pin 3), not underneath the part. Keep digital traces (SCLK, DOUT, CS) away from the AIN trace to avoid digital-to-analog coupling.
Add an input antialiasing RC network to the AIN pin (pin 5). The series resistor should be 50 ohm to 200 ohm, and the capacitor to ground should be sized such that RC = 1/(2*pi*3*fsample) to achieve 3rd-order filtering at the Nyquist frequency. Estimated: for 1 MSPS throughput, target RC around 50 ohm + 470 pF gives a -3 dB at approximately 6.8 MHz, well above the 500 kHz Nyquist. Lower resistor values reduce distortion at the cost of increased ADC input current.
Do not connect VDRIVE (pin 2) to the same supply as VDD if the host microcontroller operates at a different logic level - VDRIVE defines the DOUT logic-high voltage and should be tied to the MCU's VDD. A common mistake is leaving the REFIN/REFOUT pin floating when using the internal reference; the datasheet requires a 10 uF decoupling capacitor on this pin for proper reference stability. Do not exceed 5.25 V on either VDD or VDRIVE, or the ESD protection diodes will forward-bias and damage the part. For daisy-chain operation, ensure CS is held low through the entire conversion sequence.
Thông tin tuân thủ
Z-suffix per Analog Devices naming convention indicates RoHS-compliant lead-free matte-tin termination. Not AEC-Q100 qualified (industrial-grade only). For automotive applications, consult Analog Devices automotive-grade portfolio. REACH compliance status per EU regulatory documentation.
