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Analog Devices Inc. AD670KPZ
- Part No.:
- AD670KPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
AD670KPZ.pdf
- Description:
- IC ADC 8BIT SAR 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
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Product details
Overview
AD670KPZ from Analog Devices is a complete 8-bit signal conditioning analog-to-digital converter integrating an instrumentation amplifier front end, precision voltage reference, successive approximation register (SAR), DAC, comparator, and three-state digital output buffer on a single monolithic IC. It operates from a single +5 V supply, delivers 10 µs conversion time, supports differential bipolar/unipolar inputs (±128 mV or ±1.28 V ranges), and requires no external trims or components for full 8-bit accuracy in transducer interface applications.
For engineers reviewing the AD670KPZ datasheet, AD670KPZ pinout, AD670KPZ application, or AD670KPZ equivalent, this page provides verified technical context, confirmed package mapping (20-pin PLCC), validated pin functions, real-world transducer interface use cases, and two field-validated alternative parts with documented functional and application-level differences.
Technical Context
The AD670KPZ implements a dynamic SAR architecture using a tapped delay-line inverter chain instead of a clock-driven DAC, eliminating external timing dependencies while achieving guaranteed no-missing-codes performance over temperature. Its instrumentation amplifier front end provides high-impedance differential inputs with 1 LSB common-mode rejection ratio across both 255 mV and 2.55 V input ranges.
Control logic accepts standard microprocessor signals (R/W, CS, CE) to initiate conversion or enable data readout; STATUS pin indicates active conversion; FORMAT and BPO/UPO pins configure output coding (2's complement/offset binary) and input polarity (bipolar/unipolar) per conversion cycle without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers discrete quantization steps of 1 mV or 10 mV per LSB depending on selected input range. |
| Conversion Time | 10 µs - enables up to 100 kSPS sampling rate in burst or continuous modes without external clocking. |
| Input Ranges | Differential: ±128 mV (1 mV/LSB) or ±1.28 V (10 mV/LSB) - selectable via internal scaling resistors and BPO/UPO pin state. |
| Relative Accuracy | ±1/4 LSB (typ) - ensures monotonic transfer function and eliminates missing codes across full operating temperature range. |
| Supply Voltage | +4.5 V to +5.5 V - compatible with standard TTL/CMOS logic rails and eliminates need for auxiliary supplies. |
| Common-Mode Rejection | 1 LSB (255 mV & 2.55 V ranges) - preserves signal integrity when digitizing bridge outputs or thermocouple signals with large dc offsets. |
| Output Interface | Three-state parallel 8-bit bus - directly connects to 8-bit microprocessor data buses without level-shifting or bus buffers. |
Pinout & Package
AD670KPZ is housed in a 20-terminal plastic leaded chip carrier (PLCC-20, package code P-20A), with gull-wing leads and exposed thermal pad (not electrically connected). Pin numbering follows standard PLCC convention (Pin 1 = corner mark, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–9 | Digital Output Bus (D0–D7, NC) | Three-state CMOS-compatible outputs delivering 8-bit conversion result; D0 = LSB, D7 = MSB; Pin 9 is no-connect. |
| 10 | VCC | +5 V power supply input; decoupling capacitor required at device pin for stable SAR operation. |
| 11 | BPO/UPO | Bipolar/Unipolar select: logic high enables bipolar offset current injection for ± input ranges; logic low selects unipolar mode. |
| 12 | FORMAT | Output coding select: logic high enables 2's complement output; logic low selects offset binary (straight binary in unipolar mode). |
| 13 | STATUS | Open-collector status flag: pulled high externally; goes low when conversion completes and data is valid. |
| 14 | R/W | Read/Write control: low initiates conversion; high enables data readout when CS and CE are low. |
| 15 | CS | Chip Select: active-low enable for read/write operations; interchangeable with CE. |
| 16, 17 | +IN, –IN | Differential analog inputs: high-impedance instrumentation amp inputs accepting ±128 mV or ±1.28 V full-scale signals. |
| 18, 19 | REF IN+, REF IN– | Reference input terminals: internally connected to precision bandgap reference; unused in standard configuration. |
| 20 | GND | Analog/digital common ground reference; must be tied to system ground with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated instrumentation amplifier front end | Enables direct connection to strain gauges, RTDs, and thermocouples without external preamplification or gain-setting resistors. |
| No user trim required | Laser-trimmed thin-film SiCr resistor ladder and factory-calibrated offset/gain ensure ±1/4 LSB relative accuracy without potentiometers or calibration routines. |
| Flexible input/output configuration | Per-conversion selection of unipolar/bipolar input and 2's complement/offset binary output via BPO/UPO and FORMAT pins - supports mixed-signal firmware architectures. |
| Single-supply +5 V operation | Eliminates need for dual ±15 V supplies typical of legacy ADCs, reducing bill-of-materials and PCB area in embedded sensor nodes. |
| Guaranteed no missing codes | Validated across –40°C to +85°C (K grade) using I²L process and dynamic SAR architecture - critical for closed-loop control and safety-critical monitoring. |
Applications
| Temperature Transducer Interface | Strain Gauge Load Cell Digitization |
|---|---|
|
Use Scenario: Direct digitization of AD590 current-output temperature sensor or platinum RTD in industrial HVAC or process control systems. IC Role / Device Role / Timing Role: Signal conditioning ADC performing voltage conversion, gain scaling, and bipolar offset correction - replaces op-amp + external ADC solution. Use Value: Achieves 1°C resolution over 0°C–255°C using ±128 mV range and 1 mV/LSB quantization without external amplifiers or trim components. |
Use Scenario: Reading millivolt-level output from semiconductor load cells (e.g., Data Instruments JP-20) in weighing scales or force feedback systems. IC Role / Device Role / Timing Role: High-CMRR differential ADC capturing ±150 mV full-scale bridge output with 2.1 oz/LSB resolution. Use Value: Enables ±17 lb measurement range with built-in instrumentation amp rejecting common-mode noise from excitation supply ripple. |
| Differential Temperature Monitoring | Multiplexed Sensor Acquisition |
|
Use Scenario: Measuring temperature difference between two points using dual AD590 sensors in environmental monitoring or thermal gradient analysis. IC Role / Device Role / Timing Role: Bipolar-input ADC configured for ±128 mV range accepting differential current-to-voltage converted signals. Use Value: Delivers 1°C differential resolution with software-correctable scale factor error - avoids matched external amplifiers and dual ADCs. |
Use Scenario: Low-cost multi-channel data acquisition where one AD670KPZ serves multiple transducers via external analog multiplexer. IC Role / Device Role / Timing Role: Standalone ADC with STATUS-driven handshaking enabling precise timing control of sample-and-hold sequencing. Use Value: Reduces system cost by sharing single ADC across 4–8 channels while maintaining 10 µs conversion latency and no missing codes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit signal conditioning ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7810BRUZ | 10-bit SAR ADC with serial SPI interface; no integrated instrumentation amp; requires external reference and driver. | Used in space-constrained designs needing higher resolution but accepting added external components and firmware overhead. | Select when >8-bit resolution is mandatory and board area allows for reference/op-amp layout. |
| MAX1113CPE+ | 8-bit ADC with internal reference and rail-to-rail inputs; no differential instrumentation amp; only unipolar input support. | Suitable for single-ended sensor interfaces (e.g., potentiometers, photoresistors) where common-mode rejection is not required. | Choose for cost-sensitive unipolar-only applications where CMRR > 80 dB is unnecessary. |
Compared with AD670KPZ, AD7810BRUZ offers higher resolution but lacks integrated signal conditioning and requires serial interface handling, while MAX1113CPE+ reduces component count for unipolar use but cannot replace AD670KPZ in differential transducer applications requiring >100 dB CMRR.
Availability
AD670KPZ is available at Aetrix Electronics and suitable for industrial temperature sensing, load cell digitization, differential transducer monitoring, and multiplexed sensor acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD670KPZ 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, serving industrial, automotive, communications, and healthcare markets with precision data conversion and signal conditioning solutions.
The AD670KPZ belongs to Analog Devices' legacy signal conditioning ADC product line, designed specifically for embedded transducer interfacing where integration, reliability, and minimal external component count are prioritized over ultra-high speed or resolution.
FAQ
What is the operating temperature range for the AD670KPZ?
The AD670KPZ is rated for operation from –40°C to +85°C (K grade), matching the specification for industrial environments. This range is confirmed in the Ordering Guide and supported by tested performance data for gain accuracy (±0.75 LSB), zero error (±0.5 LSB), and guaranteed no missing codes across the full span - making AD670KPZ suitable for factory automation and outdoor sensor nodes where ambient extremes occur.
Does the AD670KPZ require external calibration components?
No, the AD670KPZ requires no external trims or calibration components. Laser wafer trimming of its thin-film SiCr resistor ladder and factory calibration of offset/gain ensure ±1/4 LSB relative accuracy and guaranteed no missing codes over temperature - all functionality is self-contained within the AD670KPZ die, eliminating potentiometers, trim caps, or calibration firmware.
How does the AD670KPZ achieve 10 µs conversion time without an external clock?
The AD670KPZ uses a "dynamic SAR" architecture based on a tapped delay-line inverter chain rather than a clock-driven DAC. Sections between taps act as one-shots that set/reset bits and strobe the comparator sequentially - enabling deterministic 10 µs conversion time for AD670KPZ without requiring external timing sources or clock distribution networks.
Can the AD670KPZ interface directly to a strain gauge bridge?
Yes, the AD670KPZ can interface directly to a strain gauge bridge via its differential instrumentation amplifier inputs. Its 1 LSB common-mode rejection ratio (CMRR) over frequency and ±128 mV input range allow it to digitize low-level bridge outputs (e.g., ±150 mV) while rejecting excitation supply noise - eliminating the need for external instrumentation amps in AD670KPZ-based load cell systems.
What package type is used for the AD670KPZ?
The AD670KPZ uses a 20-terminal plastic leaded chip carrier (PLCC-20, package code P-20A) with gull-wing leads. This surface-mount package is explicitly listed in the Ordering Guide for the KP variant and confirmed in the Absolute Maximum Ratings and Figure 1 terminal configuration - distinct from the DIP variants (JN, KN) and ceramic DIP (AD, BD, SD) used for other grades.
AD670KPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- True Bipolar
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-PLCC (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD670KPZ FAQ
1.How can I place an order for AD670KPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670KPZ 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 AD670KPZ reliable?
The price and inventory of AD670KPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670KPZ is usually 5 days.
3.What payment methods are accepted for AD670KPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670KPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670KPZ?
AD670KPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670KPZ 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 AD670KPZ?
For technical support, including AD670KPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670KPZ requirements.
6.How does Aetrix verify that AD670KPZ is sourced from the original manufacturer or authorized distributors?
All AD670KPZ 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 AD670KPZ meets industry standards.
7.What is the process for return or replacement of AD670KPZ?
All AD670KPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD670KPZ, 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 AD670KPZ part is unused and in its original packaging.
Return procedure for AD670KPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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