特性
- Complete 12-Bit A/D Converter with Reference and Clock
- Full 8-Bit, 12-Bit or 16-Bit Microprocessor Bus Interface
- Bus Access Time 150ns
- No Missing Codes Over Temperature
- Minimal Setup Time for Control Signals
- Fast Conversion Times
- HI-574A (Max) 25µs
- HI-674A (Max) 15µs
- Low Noise, via Current-Mode Signal Transmission Between Chips
- Byte Enable/Short Cycle (AO Input)
- Guaranteed Break-Before-Make Action, Eliminating Bus Contention During Read Operation. Latched by Start Convert Input (To Set the Conversion Length)
- Supply Voltage ±12V to ±15V
描述
The HI-X74(A) is a complete 12-bit, Analog-to-Digital Converter, including a +10V reference clock, three-state outputs and a digital interface for microprocessor control. Successive approximation conversion is performed by two monolithic dice housed in a 28 lead package. The bipolar analog die features the Renesas Dielectric Isolation process, which provides enhanced AC performance and freedom from latch-up. Custom design of each IC (bipolar analog and CMOS digital) has yielded improved performance over existing versions of this converter. The voltage comparator features high PSRR plus a High-Speed current-mode latch, and provides precise decisions down to 0. 1 LSB of input overdrive. More than 2X reduction in noise has been achieved by using current instead of voltage for transmission of all signals between the analog and digital ICs. Also, the clock oscillator is current controlled for excellent stability over temperature. The HI-X74(A) offers standard unipolar and bipolar input ranges, laser trimmed for specified linearity, gain and offset accuracy. The low noise buried zener reference circuit is trimmed for minimum temperature coefficient. Power requirements are +5V and ±12V to ±15V, with typical dissipation of 385mW (HI-574A/674A) at 12V.
产品参数
| 属性 | 值 |
|---|---|
| Rating | MIL-STD-883 |
| ADC | SAR |
| Analog Supply Voltage (V) | 5 - 5 |
| Channels (#) | 1 |
| Conversion Rate (Max) (kSPS) | 67 |
| Differential NonLinearity LSB | 1 |
| Integral NonLinearity LSB | 1 |
| Power Consumption (mW) | 515 |
| Resolution (bits) | 12 |
| Shutdown Mode | No |
| Temp. Range (°C) | -55 to +125°C |
| Flow | Harsh Environment & MIL-STD-883 |
| Qualification Level | Class Q |
| Die Sale Availability? | No |
| PROTO Availability? | No |
封装选项
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SBDIP | 35.6 x 15.1 x 2.41 | 28 | 2.5 |
应用
- Military and Industrial Data Acquisition Systems
- Electronic Test and Scientific Instrumentation
- Process Control Systems
| Part Number | Status | Samples | Stock | Package | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Pb (Lead) Free | Pb Free Category | MOQ | Temp. Range (°C) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| HI1-674ATD/883 | Active | Available | Out of Stock | SBDIP | 28# | Tube | Not Applicable | Yes | Gold Plate-e4 | 39 | -55 to +125°C |
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- 应用说明英语PDF 514 KB R34AN0005EU0100 Rev.1.00 2022年12月05日AI 生成的摘要: The document explains the output data formats for precision SAR ADCs, focusing on unsigned (unipolar) and signed (bipolar) formats. It details how the analog input voltage maps to digital codes for 14-bit resolution devices, including the ISL73141SEH and ISL73148SEH models. The unsigned format encodes input voltage from zero to full scale as positive binary values, while the signed format uses two’s complement encoding to represent bipolar input ranges. Configuration through the iRADAnalyzer software and hardware setup on evaluation boards is described, including how gain settings and common mode voltages affect input ranges and output codes. Tables illustrate the relationship between input voltage, digital codes, and device operation modes.
- 产品变更通告英语PDF 260 KB PCN16087 2016年9月30日
- 应用说明英语PDF 843 KB an535 2002年6月05日AI 生成的摘要: A Data Acquisition System (DAS) requires careful design of signal conditioning, transducer selection, and signal transmission to ensure high accuracy. Signal conditioning includes multiplexing, amplification, filtering, and calibration, ideally performed near the transducer. Transducers convert physical variables to electrical signals, often voltage, with low source resistance preferred. Signal paths can be single-ended or differential; differential paths better reject common mode noise, especially for low-level signals. Shielded twisted pairs and balanced lines reduce interference. Filters, typically Butterworth low-pass, prevent aliasing and maintain signal integrity.
- 应用说明英语PDF 503 KB an9675 1999年8月13日AI 生成的摘要: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
- 应用说明英语PDF 224 KB an9654 1999年5月05日AI 生成的摘要: The document explains the reliability and failure mechanisms of semiconductor parts, focusing on life testing and wearout. It discusses how switching states cause transient current pulses and hot carrier injection, which only occur briefly during switching. Life testing at elevated temperatures accelerates aging to remove infant mortality failures, improving reliability. The failure rate follows a bathtub curve with infant mortality, useful life, and wearout phases, modeled by lognormal and exponential distributions. The Arrhenius equation relates failure rates at different temperatures. Burn-in and life tests reduce early failures without harming intrinsic reliability.
- 应用说明英语PDF 1.08 MB an002 1998年11月19日AI 生成的摘要: Data acquisition and conversion involve quantization, where the smallest resolvable analog difference (quantum) depends on the full scale range and resolution. Quantization introduces an irreducible error called quantizing error or noise. Aperture time, the conversion time uncertainty, causes amplitude errors when signals change during conversion. Sample-hold circuits reduce aperture time by storing sampled signals. The Sampling Theorem states that sampling frequency must be at least twice the highest signal frequency to avoid distortion from frequency folding or aliasing. Natural binary code is commonly used for digital representation in converters, with the most and least significant bits defining the code's resolution and value.
- 应用说明英语PDF 508 KB an9510 1998年8月19日AI 生成的摘要: The document explains fundamental analog circuit concepts for digital designers, focusing on superposition, Thevenin equivalent circuits, and feedback principles. It details the operation and assumptions of inverting and non-inverting op amps, differential amplifiers, and the use of T networks in feedback paths. The text highlights the importance of feedback in controlling closed-loop gain and stability, and distinguishes between voltage and current feedback op amps, especially in high-frequency applications like video amplifiers.
- 应用说明英语PDF 287 KB an9705 1997年2月21日AI 生成的摘要: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.
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- 应用说明英语PDF 514 KB R34AN0005EU0100 Rev.1.00 2022年12月05日AI 生成的摘要: The document explains the output data formats for precision SAR ADCs, focusing on unsigned (unipolar) and signed (bipolar) formats. It details how the analog input voltage maps to digital codes for 14-bit resolution devices, including the ISL73141SEH and ISL73148SEH models. The unsigned format encodes input voltage from zero to full scale as positive binary values, while the signed format uses two’s complement encoding to represent bipolar input ranges. Configuration through the iRADAnalyzer software and hardware setup on evaluation boards is described, including how gain settings and common mode voltages affect input ranges and output codes. Tables illustrate the relationship between input voltage, digital codes, and device operation modes.
- 应用说明英语PDF 843 KB an535 2002年6月05日AI 生成的摘要: A Data Acquisition System (DAS) requires careful design of signal conditioning, transducer selection, and signal transmission to ensure high accuracy. Signal conditioning includes multiplexing, amplification, filtering, and calibration, ideally performed near the transducer. Transducers convert physical variables to electrical signals, often voltage, with low source resistance preferred. Signal paths can be single-ended or differential; differential paths better reject common mode noise, especially for low-level signals. Shielded twisted pairs and balanced lines reduce interference. Filters, typically Butterworth low-pass, prevent aliasing and maintain signal integrity.
- 应用说明英语PDF 503 KB an9675 1999年8月13日AI 生成的摘要: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
- 应用说明英语PDF 224 KB an9654 1999年5月05日AI 生成的摘要: The document explains the reliability and failure mechanisms of semiconductor parts, focusing on life testing and wearout. It discusses how switching states cause transient current pulses and hot carrier injection, which only occur briefly during switching. Life testing at elevated temperatures accelerates aging to remove infant mortality failures, improving reliability. The failure rate follows a bathtub curve with infant mortality, useful life, and wearout phases, modeled by lognormal and exponential distributions. The Arrhenius equation relates failure rates at different temperatures. Burn-in and life tests reduce early failures without harming intrinsic reliability.
- 应用说明英语PDF 1.08 MB an002 1998年11月19日AI 生成的摘要: Data acquisition and conversion involve quantization, where the smallest resolvable analog difference (quantum) depends on the full scale range and resolution. Quantization introduces an irreducible error called quantizing error or noise. Aperture time, the conversion time uncertainty, causes amplitude errors when signals change during conversion. Sample-hold circuits reduce aperture time by storing sampled signals. The Sampling Theorem states that sampling frequency must be at least twice the highest signal frequency to avoid distortion from frequency folding or aliasing. Natural binary code is commonly used for digital representation in converters, with the most and least significant bits defining the code's resolution and value.查看更多 (7)
应用说明和白皮书 (7)
- 产品变更通告英语PDF 260 KB PCN16087 2016年9月30日
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