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Analog Devices Inc. AD7895ARZ-3
- Part No.:
- AD7895ARZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7895ARZ-3.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:212
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Product details
Overview
AD7895ARZ-3 from Analog Devices is a 12-bit successive-approximation ADC with ±2.5 V bipolar input range, 3.8 µs conversion time in high-speed mode, single +5 V supply operation, and high-speed two-wire serial interface (SCLK/SDATA). It integrates on-chip track/hold, internal clock, and 2's complement output coding - used in precision data acquisition systems for industrial sensor interfacing.
For engineers reviewing the AD7895ARZ-3 datasheet, AD7895ARZ-3 pinout, AD7895ARZ-3 application, or AD7895ARZ-3 equivalent, key selection criteria include bipolar ±2.5 V input scaling, guaranteed no missing codes, 70 dB SNR at 50 kHz, automatic power-down mode (5 µA standby), and SOIC-8 package compatibility with legacy 8-pin ADC layouts.
Technical Context
The AD7895ARZ-3 implements a laser-trimmed R-2R ladder DAC-based SAR architecture with integrated track/hold amplifier and on-chip oscillator. Its analog front-end uses resistor-scaling networks (R1 = R2 = 6.5 kΩ, R3 open) to support ±2.5 V input while maintaining 9 kΩ minimum input resistance and high-impedance sampling.
It operates in two deterministic modes: Mode 1 (3.8 µs conversion, CONVST falling-edge triggered, BUSY high during conversion) and Mode 2 (9.8 µs total cycle including 6 µs wake-up, CONVST low-hold activated sleep). Serial data output is 16-bit frame (4 leading zeros + 12-bit 2's complement result), synchronized to SCLK falling edge with 10 ns data hold time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full operating temperature range (–40°C to +85°C). |
| Conversion Time | 3.8 µs (Mode 1) - enables up to 192 kHz sustained throughput when paired with 15 MHz SCLK and proper 300 ns inter-conversion guard band. |
| Analog Input Range | ±2.5 V - supports bipolar industrial sensor signals (e.g., strain gauges, accelerometers) without external level-shifting circuitry. |
| Signal-to-Noise+Distortion | 70 dB min @ 50 kHz - meets precision measurement requirements for 10-bit ENOB-equivalent dynamic performance. |
| Power Dissipation | 20 mW max (4 mA IDD @ 5 V) - includes active conversion; drops to 25 µW in power-down mode (5 µA IDD). |
| Reference Input | +2.5 V ±5% - buffered REF IN pin accepts external precision reference (e.g., AD780); 1 µA max input current minimizes reference load error. |
| Digital Interface | 2-wire serial (SCLK/SDATA) - 15 MHz max SCLK frequency; data valid on SCLK falling edge with 10 ns hold time for robust microcontroller timing margin. |
Pinout & Package
AD7895ARZ-3 is housed in an 8-pin SOIC package (SO-8, body width 3.9 mm, JEDEC MS-012AC), pin-compatible with AD7895AN-3 (mini-DIP) and functionally aligned with AD7894 (14-bit upgrade path).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts +2.5 V ±5% external reference; on-chip buffer isolates reference source from ADC switching noise (1 µA max input current). |
| 2 - VIN | Analog input channel | ±2.5 V bipolar input with 9 kΩ min input resistance; resistor-scaling network enables direct connection to industrial transducers. |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital logic - must be star-connected to minimize ground bounce in mixed-signal layouts. |
| 4 - SCLK | Serial clock input | Edge-triggered master clock (max 15 MHz); falling edge clocks out SDATA bit; requires ≥352 ns high/low pulse width per timing spec. |
| 5 - SDATA | Serial data output | Three-state CMOS output; delivers 16-bit frame (4 zeros + 12-bit 2's complement result); data valid 10 ns after SCLK falling edge. |
| 6 - BUSY | Conversion status indicator | Active-high open-drain signal (pulled high externally); asserts high on CONVST falling edge, deasserts low 3.8 µs later (Mode 1). |
| 7 - CONVST | Convert start trigger | Edge-sensitive input; falling edge initiates conversion and hold mode (Mode 1); low-hold enables auto-sleep (Mode 2). |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers all analog and digital sections; 4 mA max IDD ensures stable operation under full throughput load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold amplifier | Acquires input to ±0.5 LSB in ≤0.5 µs - eliminates need for external sample-and-hold, reducing BOM count and layout area in compact DAQ modules. |
| Auto power-down mode | Reduces IDD to 5 µA after conversion completion - extends battery life in portable instrumentation without software intervention. |
| Bipolar ±2.5 V input scaling | Resistor network (R1=R2=6.5 kΩ) enables direct interface to ±2.5 V sensors - avoids external op-amp gain/level-shift stages and associated drift errors. |
| Guaranteed no missing codes | Specified over full –40°C to +85°C range - ensures monotonicity in closed-loop control applications where code dropout causes instability. |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 15 MHz max clock - simplifies isolation design (e.g., single-channel digital isolator) versus parallel bus alternatives. |
Applications
| Industrial Process Monitoring | Portable Test Equipment |
|---|---|
|
Use Scenario: Real-time monitoring of pressure, temperature, and flow sensors in PLC I/O modules with ±2.5 V output ranges. IC Role / Device Role / Timing Role: Primary 12-bit data acquisition front-end; performs synchronized sampling at 100 kHz with minimal latency via Mode 1 operation. Use Value: Eliminates external signal conditioning for bipolar sensors, reduces system power by 30% vs. discrete track/hold + ADC solutions, and maintains 70 dB SNR across industrial temperature range. |
Use Scenario: Battery-powered handheld multimeter or oscilloscope probe interface requiring low quiescent current and fast settling. IC Role / Device Role / Timing Role: Core ADC in portable DAQ subsystem; leverages Mode 2 auto-sleep to achieve <10 µA average current during idle periods between measurements. Use Value: Enables >100-hour battery life on two AA cells while preserving 12-bit resolution and ±2.5 V full-scale range for differential sensor inputs. |
| Motor Control Feedback | Medical Sensor Interface |
|
Use Scenario: Sampling current shunt voltages and encoder signals in servo drive feedback loops with tight timing constraints. IC Role / Device Role / Timing Role: High-speed acquisition node; uses 3.8 µs conversion + 1.1 µs serial read to fit within 8.2 µs minimum throughput window for 192 kHz loop rates. Use Value: Supports real-time current loop bandwidths up to 48 kHz without pipeline delay artifacts; 2's complement output simplifies signed arithmetic in DSP firmware. |
Use Scenario: Digitizing ECG, EEG, or bioimpedance signals in point-of-care diagnostic devices requiring low noise and DC accuracy. IC Role / Device Role / Timing Role: Precision analog front-end ADC; utilizes on-chip track/hold to capture transient biopotential waveforms without aperture jitter degradation. Use Value: Achieves 70 dB SNR and ±1 LSB relative accuracy - meets IEC 60601-2-27 requirements for Class II electrocardiographs without post-processing calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7895ARZ-10 | ±10 V input range, 24 kΩ input resistance, same 3.8 µs conversion and SOIC-8 package. | Designed for higher-voltage industrial sensors (e.g., 4–20 mA loop receivers with voltage drop scaling). | Select AD7895ARZ-10 only if system requires ±10 V full-scale; AD7895ARZ-3 provides better noise immunity and lower input bias current for ±2.5 V sources. |
| AD7894ARZ | 14-bit resolution, same SOIC-8 footprint, pin-compatible upgrade path; 3.8 µs conversion, ±2.5 V input option available. | Targets applications needing higher dynamic range (84 dB SNR) without changing PCB layout or firmware interface logic. | Choose AD7894ARZ when future-proofing for 14-bit precision; note that AD7895ARZ-3 remains optimal for cost-sensitive, power-constrained designs where 12-bit resolution suffices. |
Compared with AD7895ARZ-10 and AD7894ARZ, the AD7895ARZ-3 uniquely balances ±2.5 V bipolar input fidelity, ultra-low 5 µA standby current, and proven 192 kHz throughput - making it the preferred choice for space- and battery-limited industrial DAQ nodes where 12-bit resolution meets specification.
Availability
AD7895ARZ-3 is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, motor control feedback, and medical sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7895ARZ-3 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7895ARZ-3 belongs to Analog Devices' precision data acquisition ADC family, engineered for industrial, instrumentation, and medical applications demanding low power, small footprint, and guaranteed monotonicity without external support components.
FAQ
What is the maximum sampling rate achievable with the AD7895ARZ-3?
The AD7895ARZ-3 achieves a maximum sustained sampling rate of 192 kHz in Mode 1 operation. This requires a 15 MHz SCLK, 3.8 µs conversion time, 1.1 µs serial read (16 clocks), and strict adherence to the 300 ns minimum inter-conversion guard band. At lower SCLK frequencies or in Mode 2 (auto-sleep), the effective rate decreases due to longer wake-up and conversion cycles. The AD7895ARZ-3 datasheet specifies this 192 kHz figure under defined timing conditions with VDD = 5 V and T = +25°C.
Does the AD7895ARZ-3 require an external reference voltage?
Yes, the AD7895ARZ-3 requires an external +2.5 V reference applied to the REF IN pin. The device includes an on-chip buffer with ≤1 µA input current, allowing use of precision references like the AD780 or AD680. Reference accuracy directly impacts full-scale error - a ±0.1% reference tolerance contributes ~±0.5 LSB gain error. The AD7895ARZ-3 does not generate its own reference and will not operate correctly without a stable +2.5 V ±5% source on REF IN.
How does the power-down mode work on the AD7895ARZ-3?
The AD7895ARZ-3 enters automatic power-down mode when CONVST remains low after conversion completes (BUSY goes low). In this state, IDD drops to 5 µA max at +25°C. The part "wakes up" on the rising edge of the next CONVST pulse, with a 6 µs wake-up time before track/hold enters hold mode. This feature reduces average power in low-duty-cycle applications. The AD7895ARZ-3 must be configured for Mode 2 operation to enable this behavior, and the wake-up timing is independent of SCLK activity.
Is the AD7895ARZ-3 pin-compatible with other variants in the AD7895 family?
Yes, the AD7895ARZ-3 is pin-compatible with all AD7895 variants in the same package type: AD7895ARZ-2 (0 V to +2.5 V), AD7895ARZ-10 (±10 V), and AD7895AN-3 (mini-DIP). All share identical SOIC-8 pinout, power sequencing, and serial interface timing. However, input range, output coding (2's complement for -3/-10, straight binary for -2), and input resistance differ - firmware and analog front-end must be validated per variant. The AD7895ARZ-3 cannot be substituted for AD7895ARZ-2 without modifying reference and signal scaling.
What is the significance of the 70 dB SNR specification for the AD7895ARZ-3?
The 70 dB minimum Signal-to-(Noise + Distortion) ratio at 50 kHz input frequency means the AD7895ARZ-3 resolves approximately 10.2 effective bits (ENOB) under those conditions - sufficient for high-fidelity industrial sensor digitization. This specification is measured with fSAMPLE = 200 kHz and reflects combined thermal noise, quantization noise, and harmonic distortion. The AD7895ARZ-3 maintains this 70 dB performance across its full –40°C to +85°C operating range, confirming stability in harsh environments without derating.
AD7895ARZ-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 192k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- 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:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7895ARZ-3 FAQ
1.How can I place an order for AD7895ARZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7895ARZ-3 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 AD7895ARZ-3 reliable?
The price and inventory of AD7895ARZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7895ARZ-3 is usually 5 days.
3.What payment methods are accepted for AD7895ARZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7895ARZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7895ARZ-3?
AD7895ARZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7895ARZ-3 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 AD7895ARZ-3?
For technical support, including AD7895ARZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7895ARZ-3 requirements.
6.How does Aetrix verify that AD7895ARZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7895ARZ-3 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 AD7895ARZ-3 meets industry standards.
7.What is the process for return or replacement of AD7895ARZ-3?
All AD7895ARZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7895ARZ-3, 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 AD7895ARZ-3 part is unused and in its original packaging.
Return procedure for AD7895ARZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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