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Analog Devices Inc. AD7895AN-2
- Part No.:
- AD7895AN-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7895AN-2.pdf
- Description:
- IC ADC 12BIT SRL 5V 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:922
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Product details
Overview
AD7895AN-2 from Analog Devices is a 12-bit unipolar successive-approximation ADC with 3.8 µs conversion time, single +5 V supply operation, 0 V to +2.5 V input range, and high-speed serial interface. It integrates on-chip track/hold amplifier, internal clock, and straight binary output coding-designed for precision data acquisition in space-constrained industrial sensor interfaces.
For engineers reviewing the AD7895AN-2 datasheet, AD7895AN-2 pinout, AD7895AN-2 application, or AD7895AN-2 equivalent, key selection criteria include unipolar 0–2.5 V input compliance, 70 dB SNR at 50 kHz, ±1 LSB relative accuracy, 20 mW max power dissipation, and compatibility with microcontroller SPI-like serial read timing (15 MHz SCLK, 16-bit frame with 4 leading zeros).
Technical Context
The AD7895AN-2 implements a laser-trimmed R-2R ladder SAR architecture with integrated track/hold and buffered 2.5 V reference input. Its analog front-end accepts only 0 V to +2.5 V unipolar signals with ≤500 nA input current and no external scaling resistors-unlike the AD7895-10/-3 variants.
It operates in two modes: Mode 1 (high-speed, 3.8 µs conversion, BUSY active during conversion) and Mode 2 (auto-power-down, 9.8 µs total cycle including 6 µs wake-up). Serial output delivers 16 bits per frame (4 leading zeros + 12 data bits) on SDATA, synchronized to falling-edge SCLK, with data valid for 10 ns after each falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes over full operating temperature range (–40°C to +85°C) |
| Analog Input Range | 0 V to +2.5 V - requires external 2.5 V reference; no input scaling resistors needed |
| Conversion Time | 3.8 µs (Mode 1) - enables up to 192 kHz sampling rate when combined with 1.1 µs serial read at 15 MHz SCLK |
| Signal-to-Noise+Distortion | 70 dB min @ 50 kHz - meets precision measurement requirements for sensor signal chains |
| Relative Accuracy | ±1 LSB max - ensures monotonic transfer function and predictable code transitions |
| Power Dissipation | 20 mW max at +5 V - supports battery-powered or thermally constrained embedded systems |
| Output Coding | Straight (natural) binary - simplifies firmware decoding vs. 2's complement used in bipolar variants |
Pinout & Package
AD7895AN-2 is housed in an 8-pin plastic DIP (N-8 package), 0.3" wide, with standard through-hole mounting. Pin spacing and footprint match industry-standard 8-DIP layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% reference; max 1 µA input current; sets full-scale range |
| 2 - VIN | Analog input channel | Unipolar 0 V to +2.5 V input; high-impedance (>1 GΩ effective); no dynamic charging current |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital logic; must be low-impedance |
| 4 - SCLK | Serial clock input | External clock up to 15 MHz; falling edge clocks out SDATA; min pulse width 352 ns |
| 5 - SDATA | Serial data output | 3-state output; provides 16-bit frame (4 zeros + 12 data bits); data valid 10 ns after SCLK falling edge |
| 6 - BUSY | Conversion status indicator | Active-high open-drain output; asserts high on CONVST falling edge, clears low after conversion completes |
| 7 - CONVST | Convert start trigger | Edge-triggered input; falling edge initiates conversion and hold mode; low level enables auto-power-down |
| 8 - VDD | Positive supply | +5 V ±5%; powers all analog and digital circuitry; max IDD = 4 mA in active mode |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to ±1/2 LSB in ≤0.5 µs-enables accurate digitization of fast-changing sensor outputs without external components |
| Auto power-down mode | Reduces IDD to ≤10 µA between conversions-extends battery life in intermittent-sampling applications |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 15 MHz max clock-eliminates parallel bus routing and reduces MCU GPIO count |
| Unipolar straight-binary output | Direct mapping of 0x000–0xFFF to 0–2.5 V-removes sign-bit handling and simplifies firmware math |
| Single-supply +5 V operation | No dual-rail or charge-pump required-reduces BOM cost and PCB area vs. legacy ±15 V ADCs |
Applications
| Industrial Process Monitoring | Medical Sensor Signal Conditioning |
|---|---|
Use Scenario: Digitizing output of 4–20 mA loop-powered pressure transducers conditioned to 0–2.5 V via precision resistor network. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor voltage with 12-bit resolution and <3.8 µs latency per sample. Use Value: Enables real-time closed-loop control with deterministic sampling intervals and minimal firmware overhead due to serial interface simplicity. |
Use Scenario: Converting amplified ECG electrode signals (0–2.5 V range) in portable patient monitors with strict power budgets. IC Role / Device Role / Timing Role: Low-power, high-SNR ADC operating in auto-sleep mode between heartbeat-triggered acquisitions. Use Value: Delivers 70 dB SNR at 50 kHz while consuming <25 µW in standby-extending battery runtime without sacrificing diagnostic fidelity. |
| Automotive Battery Voltage Supervision | Test & Measurement Front-End |
Use Scenario: Monitoring 12 V automotive battery voltage scaled to 0–2.5 V using precision resistor divider for state-of-charge estimation. IC Role / Device Role / Timing Role: Unipolar ADC interfaced directly to microcontroller SPI peripheral with no level-shifting or polarity inversion. Use Value: Straight binary output eliminates software sign-extension logic; ±1 LSB linearity ensures accurate voltage threshold detection across temperature. |
Use Scenario: Building modular data acquisition modules where compact 8-pin ADCs replace larger 16-bit parallel devices in benchtop instruments. IC Role / Device Role / Timing Role: Space-optimized SAR ADC providing 192 kHz throughput in minimal board area (DIP or SOIC). Use Value: 8-pin package reduces PCB footprint by >60% vs. comparable 24-pin parallel ADCs-accelerating prototyping and lowering assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit unipolar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7895AR-2 | Same electrical specs; SOIC-8 package instead of PDIP-8; θJA = 170°C/W vs. 130°C/W | Better suited for surface-mount production and higher-density PCBs | Select AR-2 for automated assembly; AN-2 preferred for prototyping, socketing, or thermal-limited environments |
| AD7894AR-3 | 14-bit resolution, ±2.5 V input range, 2's complement output, 3 µs conversion, same SOIC-8 footprint | Requires bipolar signal conditioning and firmware sign-handling; higher resolution but narrower input range | Choose AD7894AR-3 only if 14-bit precision is mandatory and input signal fits ±2.5 V range |
Compared with AD7895AR-2, the AD7895AN-2 offers identical performance in a through-hole package with superior thermal resistance-critical for high-reliability industrial use. Versus AD7894AR-3, it trades 2 bits of resolution for guaranteed unipolar 0–2.5 V compatibility and simpler firmware integration.
Availability
AD7895AN-2 is available at Aetrix Electronics and suitable for industrial process monitoring, medical sensor signal conditioning, automotive battery supervision, and test & measurement front-end designs requiring stable component supply across extended temperature ranges.
Supply support for AD7895AN-2 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7895 family was designed to deliver fast, low-power, serial-output 12-bit data conversion in minimal 8-pin packages-targeting space- and power-sensitive embedded systems where precision and ease of interface are critical.
FAQ
What is the maximum input voltage the AD7895AN-2 can safely accept?
The AD7895AN-2 has an absolute maximum analog input rating of –5 V to +10 V, but its specified linear operating range is strictly 0 V to +2.5 V. Exceeding +2.5 V risks code saturation and violates the unipolar transfer function; sustained overvoltage may damage the input stage. Always use clamping or scaling networks if input signals exceed this range.
Does the AD7895AN-2 require an external reference voltage?
Yes, the AD7895AN-2 requires an external +2.5 V reference applied to the REF IN pin. The device does not include an internal reference. Precision references such as the AD780 or AD680 are recommended to maintain the specified ±1 LSB linearity and 70 dB SNR performance.
How does the AD7895AN-2 handle power management during idle periods?
The AD7895AN-2 supports automatic power-down mode: when CONVST remains low after conversion completion, the device enters standby, reducing IDD to ≤10 µA. It wakes up automatically before the next conversion cycle-no external control signal is needed beyond the CONVST trigger.
Can the AD7895AN-2 interface directly with a standard SPI master?
Yes-the AD7895AN-2's SCLK/SDATA/BUSY interface is SPI-compatible in mode 0 (CPOL = 0, CPHA = 0), though it lacks dedicated CS. BUSY serves as ready/busy indicator, and SDATA is 3-state. A GPIO must emulate chip select by controlling CONVST timing and ensuring no SCLK activity during conversion.
What is the significance of the "AN" suffix in AD7895AN-2?
The "AN" suffix denotes the 8-pin plastic DIP (N-8) package variant of the AD7895AN-2. It specifies the physical form factor-not temperature grade or speed bin. All AD7895AN-2 units meet the –40°C to +85°C operating range and ±1 LSB linearity spec per the official Analog Devices ordering guide.
AD7895AN-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 192k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7895AN-2 FAQ
1.How can I place an order for AD7895AN-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7895AN-2 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 AD7895AN-2 reliable?
The price and inventory of AD7895AN-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7895AN-2 is usually 5 days.
3.What payment methods are accepted for AD7895AN-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7895AN-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7895AN-2?
AD7895AN-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7895AN-2 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 AD7895AN-2?
For technical support, including AD7895AN-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7895AN-2 requirements.
6.How does Aetrix verify that AD7895AN-2 is sourced from the original manufacturer or authorized distributors?
All AD7895AN-2 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 AD7895AN-2 meets industry standards.
7.What is the process for return or replacement of AD7895AN-2?
All AD7895AN-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7895AN-2, 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 AD7895AN-2 part is unused and in its original packaging.
Return procedure for AD7895AN-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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