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Analog Devices Inc. LTC1272-8ACN#PBF
- Part No.:
- LTC1272-8ACN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1272-8ACN#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
LTC1272-8ACN#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8 µs conversion time, successive approximation ADC with on-chip sample-and-hold and internal 2.42 V reference. It operates from a single 5 V supply, delivers up to 111 kHz sampling rate, and maintains ±1 LSB integral linearity over 0°C to 70°C - enabling high-fidelity data acquisition in industrial sensor interfaces and DSP front-ends.
For engineers reviewing the LTC1272-8ACN#PBF datasheet, LTC1272-8ACN#PBF pinout, LTC1272-8ACN#PBF application, or LTC1272-8ACN#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic performance (S/(N+D) = 72 dB at 10 kHz), real-world interface timing constraints (tCONV = 13 clock cycles), and two rigorously cross-checked drop-in alternatives for AD7572-replacement designs.
Technical Context
The LTC1272-8ACN#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and curvature-corrected bandgap reference. Its 12-bit DAC uses binary-weighted capacitors, and conversion is synchronized to an external 1.6 MHz clock or crystal oscillator connected between CLK IN and CLK OUT pins.
It supports two digital interface modes: Slow Memory Mode (conversion triggered by RD/CS low, data valid after BUSY deasserts) and ROM Mode (RD/CS low reads prior result while initiating new conversion). HBEN enables 8-bit byte-multiplexed output via D7–D0/8, preserving full 12-bit resolution across two reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for control-loop stability. |
| Conversion Time | 8 µs (LTC1272-8 variant) - sets maximum sustained sampling rate at 111 kHz with 1 µs inter-conversion delay. |
| Sampling Rate | Up to 111 kHz - sufficient for baseband audio digitization and motor current sensing up to ~55 kHz Nyquist bandwidth. |
| Reference Output | 2.42 V ±1% (±25 ppm/°C tempco) - internally trimmed, eliminates need for external reference in unipolar 0–5 V input systems. |
| Integral Linearity | ±0.5 LSB (typ), ±1 LSB (max) - ensures <0.025% end-point error for precision instrumentation scaling. |
| Signal-to-Noise + Distortion | 72 dB at 10 kHz input - corresponds to 11.5 ENOBs, supporting 10-bit effective resolution at full throughput. |
| Supply Current | 15–30 mA (IDD) - enables low-power embedded operation with 75 mW typical dissipation at 5 V. |
Pinout & Package
Package: 24-lead narrow plastic DIP (PDIP), 0.300" width, JEDEC MS-001, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog input | Unipolar 0 V to 5 V input node; accepts up to 3.5 mA DC current and 50 pF capacitance - compatible with LT1006/LT1007 op-amp drivers. |
| VREF (2) | Reference output | 2.42 V bandgap reference; supplies up to 1 mA load; requires 10 µF tantalum + 0.1 µF ceramic decoupling for <1 LSB noise. |
| AGND (3) | Analog ground | Single-point analog return; must be isolated from DGND except at one star point near pin 3 to prevent digital noise coupling. |
| D11–D4 (4–11) | Data outputs (MSB–D4) | Three-state CMOS outputs; drive DB11–DB4 when HBEN = LOW; high-Z when CS = HIGH or BUSY = HIGH. |
| DGND (12) | Digital ground | Digital logic return; connects to system digital ground plane but kept separate from AGND until star point. |
| D3/11–D0/8 (13–16) | Data outputs (D3–D0 or DB11–DB8) | Multiplexed outputs: DB3–DB0 when HBEN = LOW; DB11–DB8 when HBEN = HIGH - enables 8-bit bus interfacing. |
| CLK IN (17) | Timing input | Accepts TTL/CMOS clock (1.6 MHz for -8 variant); synchronizes SAR decisions; requires ≥40 ns setup to RD/CS edges for minimal feedthrough. |
| CLK OUT (18) | Timing output | Inverted CLK IN signal; used for crystal oscillator configuration; capacitance must be minimized to avoid analog noise injection. |
| HBEN (19) | High-byte enable | Controls data multiplexing: LOW → full 12-bit parallel output; HIGH → D11–D8 = DB11–DB8, D7–D0/8 = DB11–DB8 (byte mode). |
| RD (20) | Read control | Active-low signal that initiates conversion when CS and HBEN are also low; enables output drivers when CS = LOW. |
| CS (21) | Chip select | Active-low enable for RD/HBEN recognition; disables all outputs and conversion logic when HIGH. |
| BUSY (22) | Status output | Active-low open-drain indicator; goes LOW at conversion start and returns HIGH only after 12-bit latch update completes. |
| NC (23) | No connect | Internally unconnected; accommodates AD7572's –15 V pin without damage - simplifies socket replacement. |
| VDD (24) | Positive supply | 5 V ±5% supply input; absolute max 6 V; powers analog and digital sections - requires local 0.1 µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| AD7572 pin-compatible footprint | Direct socket replacement in legacy designs; NC pin (23) avoids negative supply routing changes. |
| On-chip sample-and-hold | 0.45–1 µs acquisition time enables accurate sampling of fast-changing signals without external SH circuitry. |
| Single 5 V supply operation | Eliminates dual-rail power design complexity and reduces BOM count versus AD7572's ±5 V/–15 V requirement. |
| Internal 2.42 V reference | Factory-trimmed ±1%, 25 ppm/°C tempco - removes external reference IC and trimming potentiometers. |
| ESD protection on all pins | Withstands >2 kV HBM - improves robustness during PCB handling and system integration. |
Applications
| Industrial Sensor Interface | DSP Front-End Acquisition |
|---|---|
|
Use Scenario: Digitizing thermocouple, RTD, or strain gauge outputs conditioned by instrumentation amplifiers. IC Role / Device Role / Timing Role: Precision 12-bit analog-to-digital converter with integrated S&H and reference - performs unipolar 0–5 V conversion synchronized to system clock. Use Value: ±1 LSB linearity and 72 dB S/(N+D) ensure <0.025% measurement error and clean FFT spectra for spectral analysis. |
Use Scenario: Capturing real-time audio or vibration signals for FFT-based condition monitoring in predictive maintenance systems. IC Role / Device Role / Timing Role: High-speed sampling ADC feeding 1024-point FFT engine - operates at 111 kHz with 1 µs inter-sample gap. Use Value: 11.5 ENOBs at 20 kHz preserves amplitude fidelity for harmonic detection up to 5th order. |
| Multiplexed Data Acquisition | Single-Supply Embedded Systems |
|
Use Scenario: Scanning multiple analog channels (e.g., 8-channel PLC I/O) using external analog multiplexer and shared ADC. IC Role / Device Role / Timing Role: Fast-conversion ADC with programmable HBEN-controlled byte read - reduces microcontroller bus overhead in multi-channel polling. Use Value: Two-byte read mode (D7–D0/8) allows 8-bit MCU compatibility without external glue logic or FIFO buffers. |
Use Scenario: Battery-powered or energy-harvesting edge nodes requiring minimal power and compact BOM. IC Role / Device Role / Timing Role: Low-quiescent ADC with 75 mW typical dissipation and single 5 V rail - eliminates negative supply generation circuitry. Use Value: Internal 2.42 V reference and ESD-hardened I/O reduce external components by ≥3 parts per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7572KNZ | Slower 12 µs conversion; requires ±5 V/–15 V dual supply; –5.25 V reference output; no on-chip S&H. | Legacy industrial systems with existing dual-supply rails and external sample-and-hold circuits. | Select only if maintaining identical AD7572 timing and reference polarity is mandatory; LTC1272-8ACN#PBF offers superior speed and simplified power. |
| ADS7822U | 8-bit resolution; SPI interface; 2.7–5.25 V supply; 1 µs conversion; no internal reference - requires external 2.5 V ref. | Cost-sensitive, lower-resolution portable instrumentation where serial interface saves MCU pins. | Choose for space-constrained 8-bit applications; not suitable for 12-bit precision or parallel-bus systems requiring LTC1272-8ACN#PBF's pinout. |
Compared with AD7572KNZ, the LTC1272-8ACN#PBF delivers 33% faster conversion, eliminates negative supply, and integrates reference/S&H - reducing component count and layout complexity. Against ADS7822U, it provides 4× higher resolution, parallel interface, and self-contained analog subsystem - critical for deterministic real-time acquisition.
Availability
LTC1272-8ACN#PBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, DSP front-end acquisition, and multiplexed data acquisition systems requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for LTC1272-8ACN#PBF 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. (ADI) acquired Linear Technology in 2017 and maintains its high-performance analog product lines, including precision data converters, with global manufacturing and quality certification to ISO 9001 and AEC-Q200 where applicable.
The LTC1272 series was designed for high-speed, high-accuracy data acquisition in space-constrained industrial and test equipment - emphasizing pin compatibility with industry-standard converters and single-supply operability.
FAQ
What is the maximum sampling rate supported by the LTC1272-8ACN#PBF?
The LTC1272-8ACN#PBF supports a maximum sustained sampling rate of 111 kHz, determined by its 8 µs conversion time and minimum 1 µs inter-conversion delay (t11). This allows full 12-bit resolution capture of signals up to 55.5 kHz (Nyquist limit) without aliasing in properly filtered systems.
Does the LTC1272-8ACN#PBF require an external reference voltage?
No, the LTC1272-8ACN#PBF does not require an external reference voltage. It integrates a factory-trimmed 2.42 V ±1% bandgap reference with 25 ppm/°C tempco, available at Pin 2 (VREF). This reference drives the internal DAC and can source up to 1 mA for external decoupling networks.
How does the LTC1272-8ACN#PBF interface with an 8-bit microcontroller?
The LTC1272-8ACN#PBF interfaces with 8-bit microcontrollers using its HBEN (High Byte Enable) pin. When HBEN = HIGH, the 12-bit result is multiplexed onto D7–D0/8 in two consecutive reads: first the upper 4 bits (DB11–DB8), then the lower 8 bits (DB7–DB0), enabling full resolution without 16-bit bus hardware.
Can the LTC1272-8ACN#PBF replace the AD7572 in an existing design without PCB changes?
Yes, the LTC1272-8ACN#PBF is a direct pin-compatible replacement for the AD7572 in 24-pin PDIP sockets. Key adaptations include reversing the polarity of the VREF bypass capacitor (due to +2.42 V vs –5.25 V reference) and leaving Pin 23 (NC) unconnected instead of applying –15 V.
What is the significance of the "-8" suffix in LTC1272-8ACN#PBF?
The "-8" suffix in LTC1272-8ACN#PBF denotes the 8 µs conversion time grade, optimized for 1.6 MHz clock operation. This variant achieves 111 kHz sampling rate and is distinct from the "-3" grade (3 µs, 4 MHz clock, 250 kHz sampling), with identical pinout, reference, and interface logic.
LTC1272-8ACN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1272-8ACN#PBF FAQ
1.How can I place an order for LTC1272-8ACN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1272-8ACN#PBF 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 LTC1272-8ACN#PBF reliable?
The price and inventory of LTC1272-8ACN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1272-8ACN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1272-8ACN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1272-8ACN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1272-8ACN#PBF?
LTC1272-8ACN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1272-8ACN#PBF 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 LTC1272-8ACN#PBF?
For technical support, including LTC1272-8ACN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1272-8ACN#PBF requirements.
6.How does Aetrix verify that LTC1272-8ACN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1272-8ACN#PBF 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 LTC1272-8ACN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1272-8ACN#PBF?
All LTC1272-8ACN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1272-8ACN#PBF, 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 LTC1272-8ACN#PBF part is unused and in its original packaging.
Return procedure for LTC1272-8ACN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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