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Analog Devices Inc. AD670JPZ
- Part No.:
- AD670JPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
AD670JPZ.pdf
- Description:
- IC ADC 8BIT SAR 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
AD670JPZ from Analog Devices is a complete 8-bit signal conditioning analog-to-digital converter integrating 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 delivers 10 µs conversion time, ±1/2 LSB relative accuracy at +25°C, differential input support up to ±128 mV or ±1.28 V, and operates from a single +5 V supply. It is used in transducer interface circuits for temperature, RTD, and strain gage measurement where minimal external components and factory-calibrated accuracy are required.
For engineers reviewing the AD670JPZ datasheet, AD670JPZ pinout, AD670JPZ application, or AD670JPZ equivalent, this page provides verified technical context, confirmed pin functions, real-world transducer interface use cases, and validated alternative options - all grounded in Analog Devices' official AD670 specification documents and ordering guide.
Technical Context
The AD670JPZ implements a dynamic SAR architecture without an external clock, using a tapped delay-line inverter chain to sequence bit decisions - enabling deterministic 10 µs conversion independent of system clock timing. Its instrumentation amplifier front end provides high-impedance differential inputs with guaranteed common-mode rejection of ≤1 LSB over both 255 mV and 2.55 V ranges.
Input range and output coding are software-selectable via BPO/UPO (Pin 11) and FORMAT (Pin 12): unipolar/bipolar mode and straight binary/two's complement output are configured before each conversion. The device supports stand-alone operation with R/W-only control and includes STATUS (Pin 10) for end-of-conversion indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers discrete digital output codes representing analog input with 256 distinct levels. |
| Conversion Time | 10 µs - fixed, clockless conversion latency enabling predictable timing in microprocessor bus interfaces. |
| Relative Accuracy | ±1/2 LSB at +25°C - ensures monotonic transfer function and no missing codes across full temperature range. |
| Analog Input Ranges | Differential: 0–255 mV (1 mV/LSB) or 0–2.55 V (10 mV/LSB); bipolar variants: ±128 mV or ±1.28 V - selectable via BPO/UPO pin. |
| Supply Voltage | +4.5 V to +5.5 V - operates directly from standard +5 V logic/system rail without auxiliary supplies. |
| Output Interface | Three-state TTL-compatible digital outputs (Pins 1–9) - enables direct connection to 8-bit data buses without external buffers. |
| Input Bias Current | 200–500 nA (255 mV range) - low enough to avoid significant error when interfacing high-impedance transducers like thermistors or RTDs. |
Pinout & Package
AD670JPZ is supplied in a 20-terminal plastic leaded chip carrier (PLCC) package, designated P-20A per Analog Devices' ordering guide. This surface-mount package features a 0.4-inch body width and J-lead configuration compatible with standard PLCC sockets and reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–9 | D0–D7, DB8 | Three-state digital output bus - D0 (LSB) to D7 (MSB) plus DB8 (bit 8 for extended resolution handling); high-impedance when CE/CS high or during conversion. |
| 10 | STATUS | Open-collector status flag - goes high at conversion start, returns low at completion; requires external pull-up for logic-level interface. |
| 11 | BPO/UPO | Bipolar/Unipolar select - logic low configures unipolar input; logic high enables bipolar offset for ± ranges. |
| 12 | FORMAT | Output coding select - logic low yields straight binary (unipolar) or offset binary (bipolar); logic high selects two's complement. |
| 13 | R/W | Read/Write control - low initiates conversion; high enables data read; active during CS/CE low window. |
| 14 | CS | Chip Select - active-low enable for read/write operations; interchangeable with CE. |
| 15 | CE | Chip Enable - active-low alternate control for read/write; interchangeable with CS. |
| 16, 17 | +VIN, –VIN | Differential analog inputs - accept voltage difference with common-mode range up to VCC – 3.4 V (low range) or VCC (high range). |
| 18, 19 | +VREF, –VREF | Reference inputs - internally connected to precision bandgap reference; typically left open or tied as specified in application circuits. |
| 20 | VCC | Positive supply - accepts +4.5 V to +5.5 V; powers all internal circuitry including instrumentation amp, SAR, and output buffers. |
Key Features
| Feature | Design Value |
|---|---|
| No user trims required | Laser-trimmed thin-film SiCr resistor ladder and factory calibration ensure ±1/2 LSB gain/offset accuracy across 0°C to +70°C - eliminates manual potentiometer adjustment in production. |
| Differential instrumentation amplifier front end | Provides >100 dB CMRR (≤1 LSB error) and 10 kΩ input resistance in 2.55 V range - enables direct interface to bridge sensors and RTDs without external preamp. |
| Flexible input scaling | Internal 10:1 attenuators and bipolar offset injection allow four input configurations: 0–255 mV, 0–2.55 V, ±128 mV, ±1.28 V - selected dynamically per conversion via BPO/UPO and FORMAT pins. |
| Microprocessor bus compatibility | Three-state TTL outputs, STATUS flag, and R/W/CS/CE control logic match standard 8080/8085/Z80 timing - supports direct connection to 8-bit parallel buses without glue logic. |
| Single-supply operation | Full functionality from +5 V only - eliminates need for dual ±15 V rails typical of older ADCs, reducing power supply complexity and board space. |
Applications
| Temperature Transducer Interface | RTD Signal Conditioning |
|---|---|
|
Use Scenario: Digitizing output of AD590 current-output temperature sensor in industrial monitoring systems. IC Role / Device Role / Timing Role: AD670JPZ acts as self-contained signal conditioner and ADC - converts AD590's 1 µA/K current into voltage, applies bipolar offset, and performs 8-bit conversion in 10 µs. Use Value: Achieves 1°C resolution without external op amps or trim pots; leverages ±128 mV range and factory-calibrated linearity for direct Celsius-to-digital mapping. |
Use Scenario: Measuring resistance change in 100 Ω platinum RTD for HVAC or process control. IC Role / Device Role / Timing Role: AD670JPZ serves as differential input ADC with built-in instrumentation amp - measures voltage drop across RTD excited by constant-current source. Use Value: Delivers 1 mV/°C sensitivity matched to 1 mV/LSB range, enabling 0–255°C measurement with <±1°C total error over 0°C to +70°C. |
| Strain Gage Load Cell Readout | Differential Temperature Sensing |
|
Use Scenario: Reading millivolt-level output from semiconductor load cell (e.g., Data Instruments JP-20) in test equipment. IC Role / Device Role / Timing Role: AD670JPZ functions as high-CMRR differential ADC - rejects common-mode noise from excitation supply while digitizing ±150 mV bridge output. Use Value: Provides ~2.1 oz/LSB resolution over ±17 lb range using ±128 mV mode; eliminates need for external instrumentation amp and reference trimming. |
Use Scenario: Monitoring temperature delta between two points using dual AD590 sensors in environmental chambers. IC Role / Device Role / Timing Role: AD670JPZ operates in differential input mode - compares outputs of two AD590s connected to Pins 16 and 17 to compute relative temperature difference. Use Value: Yields 1°C differential resolution with software-based span/offset correction; tolerates ±20% resistor tolerance in internal scaling network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit integrated 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 signal conditioning. | Used in space-constrained designs needing higher resolution but accepting added external components for front-end conditioning. | Select AD7810BRUZ only if 10-bit resolution is mandatory and board area allows discrete instrumentation amp + reference design. |
| MAX1113EPA+ | 8-bit ADC with internal reference and rail-to-rail inputs; no differential instrumentation amp; single-ended input only; 11 µs conversion time. | Suitable for unipolar, low-noise single-ended sensor signals where common-mode rejection is not required. | Choose MAX1113EPA+ for cost-sensitive, non-differential applications where ±128 mV bipolar range and >100 dB CMRR are unnecessary. |
Compared with AD670JPZ, AD7810BRUZ offers higher resolution but lacks integrated signal conditioning - increasing BOM count and layout complexity. MAX1113EPA+ matches bit depth and speed but omits differential inputs and instrumentation-grade CMRR, limiting its use in noisy transducer environments.
Availability
AD670JPZ is available at Aetrix Electronics and suitable for temperature sensing, RTD readout, strain gage instrumentation, and industrial transducer interface applications requiring stable component supply, long-term lifecycle support, and MIL-qualified alternatives (e.g., AD670SD).
Supply support for AD670JPZ 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 Wilmington, MA, with design and manufacturing facilities worldwide.
The AD670JPZ belongs to Analog Devices' legacy signal conditioning ADC product line, engineered specifically for embedded transducer interface applications where integration, accuracy, and single-supply operation reduce system component count and design risk.
FAQ
What is the operating temperature range for the AD670JPZ?
The AD670JPZ is rated for 0°C to +70°C operation, consistent with its "J" grade designation per Analog Devices' ordering guide. This commercial-grade temperature range supports use in office equipment, test instruments, and non-military industrial controls. The AD670JPZ maintains ±1/2 LSB relative accuracy and guaranteed no-missing-codes performance across this full range without user calibration.
Does the AD670JPZ require external components to achieve full 8-bit accuracy?
No - the AD670JPZ requires zero external components for full 8-bit accuracy. Its monolithic integration includes a laser-trimmed instrumentation amplifier, precision bandgap voltage reference, DAC, SAR logic, and three-state output buffers. Analog Devices specifies that no user trims are needed, and all calibration is performed at wafer level using thin-film SiCr resistors and laser trimming.
How does the AD670JPZ handle bipolar input signals with a single +5 V supply?
The AD670JPZ uses an internally generated bipolar offset current injected at the comparator summing node when BPO/UPO (Pin 11) is high. This allows true bipolar input ranges (±128 mV, ±1.28 V) even with single +5 V operation - eliminating need for negative supply rails. The instrumentation amplifier front end maintains differential integrity throughout, enabling ground-referenced or floating bipolar sources.
Can the AD670JPZ be interfaced directly to an 8-bit microprocessor data bus?
Yes - the AD670JPZ features TTL-compatible three-state digital outputs (Pins 1–9) and control signals (R/W, CS, CE, STATUS) fully aligned with 8080/8085 timing. Its 10 µs conversion time and 250 ns bus access time allow direct connection to common 8-bit microprocessors without wait-state generation or bus transceivers.
What package type is used for the AD670JPZ?
The AD670JPZ uses a 20-terminal plastic leaded chip carrier (PLCC) package, designated P-20A by Analog Devices. This surface-mount package has J-shaped leads, 0.4-inch body width, and is RoHS-compliant. It is distinct from the plastic DIP (N-20) used in AD670JN and ceramic DIP (D-20) used in higher-grade variants.
AD670JPZ 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:
- -
AD670JPZ FAQ
1.How can I place an order for AD670JPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670JPZ 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 AD670JPZ reliable?
The price and inventory of AD670JPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670JPZ is usually 5 days.
3.What payment methods are accepted for AD670JPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670JPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670JPZ?
AD670JPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670JPZ 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 AD670JPZ?
For technical support, including AD670JPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670JPZ requirements.
6.How does Aetrix verify that AD670JPZ is sourced from the original manufacturer or authorized distributors?
All AD670JPZ 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 AD670JPZ meets industry standards.
7.What is the process for return or replacement of AD670JPZ?
All AD670JPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD670JPZ, 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 AD670JPZ part is unused and in its original packaging.
Return procedure for AD670JPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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