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Analog Devices Inc. AD7895ANZ-2
- Part No.:
- AD7895ANZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7895ANZ-2.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,557
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Product details
Overview
AD7895ANZ-2 from Analog Devices is a 12-bit, single-supply successive-approximation ADC with 3.8 µs conversion time, unipolar 0 V to +2.5 V input range, straight binary output coding, and high-speed serial interface in an 8-pin PDIP package. It integrates on-chip track/hold, internal clock, and operates at 20 mW max power dissipation for precision data acquisition in industrial sensor interfaces.
For engineers reviewing the AD7895ANZ-2 datasheet, AD7895ANZ-2 pinout, AD7895ANZ-2 application, or AD7895ANZ-2 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and confirmed alternative options - all grounded in Analog Devices' official Rev. 0 documentation and ordering guide.
Technical Context
The AD7895ANZ-2 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with on-chip track/hold acquiring to ±1/2 LSB in ≤0.5 µs. Its analog front-end accepts 0 V to +2.5 V inputs directly at VIN with <500 nA input current and no external scaling resistors.
It supports two operating modes: Mode 1 (3.8 µs conversion, continuous sampling) and Mode 2 (9.8 µs total cycle including 6 µs wake-up, auto power-down). Serial interface uses SCLK falling edge to clock out 16-bit frames - four leading zeros followed by 12-bit straight binary data - with BUSY indicating conversion status.
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 throughput when paired with 15 MHz SCLK and proper timing margins. |
| Analog Input Range | 0 V to +2.5 V - unipolar range optimized for single-supply systems using +2.5 V reference; no external level-shifting required. |
| Output Coding | Straight (natural) binary - simplifies firmware decoding vs. 2's complement; LSB = 0.61 mV (2.5 V / 4096). |
| Power Dissipation | 20 mW max at +5 V - includes active conversion and serial read; drops to 25 µW in power-down mode. |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and predictable transfer function error across full scale. |
| Signal-to-(Noise+Distortion) | 70 dB min @ 50 kHz - meets precision measurement requirements for audio-band and sensor signal chains. |
Pinout & Package
AD7895ANZ-2 is housed in an 8-pin plastic DIP (N-8 package), 0.3" wide, with through-hole mounting. Pin numbering follows standard dual-in-line orientation (pin 1 at top-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% external reference; 1 µA max input current; sets full-scale gain and LSB size. |
| 2 - VIN | Analog input channel | Direct connection to track/hold amplifier; 0 V to +2.5 V unipolar range; <500 nA input bias current. |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital logic; must be low-impedance and separated from digital ground. |
| 4 - SCLK | Serial clock input | External clock up to 15 MHz; falling edge clocks out SDATA; timing-critical for data access (t4 = 603 ns max). |
| 5 - SDATA | Serial data output | 3-state output; provides 16-bit frame (4 zeros + 12-bit straight binary); valid 10 ns after SCLK falling edge. |
| 6 - BUSY | Conversion status indicator | Active-high open-drain output; goes high on CONVST falling edge, returns low after 3.8 µs (Mode 1) to signal data ready. |
| 7 - CONVST | Convert start trigger | Edge-sensitive input; falling edge initiates conversion and hold; low-hold enables auto power-down between cycles. |
| 8 - VDD | Positive supply | +5 V ±5%; powers analog and digital sections; 4 mA max IDD; requires local 0.1 µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤0.5 µs - eliminates need for external sample-and-hold in high-speed DC-coupled systems. |
| Auto power-down mode | Reduces IDD to 5 µA max between conversions - extends battery life in portable instrumentation without sacrificing resolution. |
| High-speed serial interface | Two-wire (SCLK/SDATA) + BUSY status - minimizes PCB routing, supports microcontroller GPIOs without SPI hardware. |
| Single +5 V supply operation | No ±15 V rails or charge pumps required - simplifies power design and reduces BOM cost in embedded data loggers. |
| Unipolar 0 V to +2.5 V input | Matches common precision voltage references (e.g., AD780, AD680) - avoids signal inversion or offset calibration in sensor front-ends. |
Applications
| Industrial Process Monitoring | Portable Data Acquisition |
|---|---|
|
Use Scenario: Measuring thermocouple or RTD outputs conditioned to 0–2.5 V range in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC capturing slow-varying analog signals with 12-bit resolution and low power consumption during idle periods. Use Value: Eliminates external track/hold and reference buffer; 20 mW max power allows thermal management in sealed enclosures. |
Use Scenario: Battery-powered handheld multimeter acquiring voltage readings at 100 Hz with display refresh and storage. IC Role / Device Role / Timing Role: Low-power, unipolar ADC enabling automatic sleep/wake cycling synchronized to measurement intervals. Use Value: Auto power-down mode cuts average current to µA range between samples - extends AA battery life to >12 months. |
| Medical Sensor Interface | Test & Measurement Equipment |
|
Use Scenario: Digitizing ECG or pulse oximeter analog outputs scaled to 0–2.5 V in Class II medical devices. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC providing straight binary output compatible with safety-certified firmware stacks. Use Value: 70 dB SNR and ±1 LSB linearity meet IEC 60601-2-27 requirements for diagnostic-grade signal fidelity. |
Use Scenario: Embedded digitizer in benchtop oscilloscope auxiliary channels requiring compact, fast-conversion ADCs. IC Role / Device Role / Timing Role: High-throughput SAR ADC delivering 192 kHz sampling with deterministic 3.8 µs latency per conversion. Use Value: Internal clock and serial interface reduce timing jitter vs. externally clocked alternatives - improves effective number of bits (ENOB). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit unipolar serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7895AR-2 | Same electrical specs and pinout; SOIC-8 package instead of PDIP. | Requires surface-mount assembly; better thermal performance (θJA = 170°C/W vs. 130°C/W) but no through-hole option. | Select for space-constrained PCBs where reflow soldering is available and mechanical robustness is secondary. |
| AD7894BN | 14-bit resolution, same 8-pin PDIP footprint, 3.8 µs conversion, but requires ±5 V supplies and bipolar ±2.5 V input. | Higher resolution but incompatible unipolar input architecture and dual-supply requirement. | Choose only if 14-bit precision is mandatory and system can accommodate dual supplies and revised signal conditioning. |
Compared with AD7895AR-2, AD7895ANZ-2 offers identical performance in a through-hole package for prototyping and ruggedized designs; compared with AD7894BN, it trades 2 bits of resolution for single-supply simplicity and unipolar compatibility - critical for cost-sensitive, battery-operated systems.
Availability
AD7895ANZ-2 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data acquisition, medical sensor interfaces, test & measurement equipment, and embedded control systems requiring stable component supply and long-term obsolescence management.
Supply support for AD7895ANZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7895 series was designed specifically for compact, low-power, high-speed data acquisition in space-constrained industrial and portable systems - emphasizing integration of track/hold, reference buffering, and serial interface into an 8-pin package.
FAQ
What is the input voltage range supported by the AD7895ANZ-2?
The AD7895ANZ-2 supports a unipolar analog input range of 0 V to +2.5 V. This is distinct from the AD7895-10 (±10 V) and AD7895-3 (±2.5 V) variants. The input connects directly to the on-chip track/hold amplifier with <500 nA bias current, requiring no external scaling resistors. Reference voltage must be +2.5 V ±5% applied to the REF IN pin.
Does the AD7895ANZ-2 require an external clock source?
No, the AD7895ANZ-2 contains a laser-trimmed internal oscillator that generates the conversion clock. An external serial clock (SCLK) is required only for reading data - it drives the serial interface at up to 15 MHz. The internal clock eliminates timing jitter and external component count, simplifying system design while maintaining 3.8 µs conversion time in Mode 1 operation.
What output coding format does the AD7895ANZ-2 use?
The AD7895ANZ-2 uses straight (natural) binary output coding - not 2's complement. Its 16-bit serial frame consists of four leading zeros followed by the 12-bit result, where 0x000 represents 0 V and 0xFFF represents +2.5 V. This simplifies firmware interpretation in microcontrollers without sign-extension logic, unlike the AD7895-10/-3 variants which use 2's complement for bipolar ranges.
How does power management work in the AD7895ANZ-2?
The AD7895ANZ-2 features an automatic power-down mode activated when CONVST remains low after conversion completes. In this state, supply current drops to 5 µA max at +25°C (10 µA over temperature), reducing power dissipation to 25 µW. The part "wakes up" on the rising edge of the next CONVST pulse, with a 6 µs wake-up time before conversion begins - ideal for intermittent sampling in battery-powered applications.
Is the AD7895ANZ-2 pin-compatible with other AD7895 variants?
Yes, all AD7895 variants - including AD7895ANZ-2, AD7895AN-10, AD7895AR-3, etc. - share identical 8-pin PDIP or SOIC footprints and pin functions. However, input range, output coding, and reference requirements differ: AD7895ANZ-2 requires 0–2.5 V unipolar input and straight binary output, while AD7895-10/-3 require bipolar inputs and 2's complement coding. Swapping variants requires signal conditioning and firmware updates.
AD7895ANZ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7895ANZ-2 FAQ
1.How can I place an order for AD7895ANZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7895ANZ-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 AD7895ANZ-2 reliable?
The price and inventory of AD7895ANZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7895ANZ-2 is usually 5 days.
3.What payment methods are accepted for AD7895ANZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7895ANZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7895ANZ-2?
AD7895ANZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7895ANZ-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 AD7895ANZ-2?
For technical support, including AD7895ANZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7895ANZ-2 requirements.
6.How does Aetrix verify that AD7895ANZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7895ANZ-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 AD7895ANZ-2 meets industry standards.
7.What is the process for return or replacement of AD7895ANZ-2?
All AD7895ANZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7895ANZ-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 AD7895ANZ-2 part is unused and in its original packaging.
Return procedure for AD7895ANZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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