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データコンバータ 
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アナログ-デジタルコンバータ(ADC)
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The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated liquid crystal display (LCD) drivers operate from a single 2.7V to 5.25V power supply. They include an internal reference, a high-accuracy on-chip oscillator, and a triplexed LCD driver. An internal charge pump generates the negative supply needed to power the integrated input buffer for single-supply operation. The ADCs are configurable for either a ±2V or ±200mV input range and outputs its conversion results to an LCD and/or to a microcontroller (µC). µC communication is facilitated through an SPI™-/QSPI™-/MICROWIRE®-compatible serial interface. The MAX1492 is a 3.5-digit (±1999 count) device, and the MAX1494 is a 4.5-digit (±19,999 count) device.
The MAX1492/MAX1494 do not require external-precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits).
These devices also feature on-chip buffers for the differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, they use continuous internal-offset calibration and offer > 100dB simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a low-battery monitor.
The MAX1494 comes in a 32-pin, 7mm x 7mm LQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.
The MAX1492/MAX1494 do not require external-precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits).
These devices also feature on-chip buffers for the differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, they use continuous internal-offset calibration and offer > 100dB simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a low-battery monitor.
The MAX1494 comes in a 32-pin, 7mm x 7mm LQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.
主な機能
- High Resolution
- MAX1494: 4.5 Digits (±19,999 Count)
- MAX1492: 3.5 Digits (±1999 Count)
- Sigma-Delta ADC Architecture
- No Integrating Capacitors Required
- No Autozeroing Capacitors Required
- > 100dB of Simultaneous 50Hz and 60Hz Rejection
- Operate from a Single 2.7V or 5.25V Supply
- Selectable Input Range of ±200mV or ±2V
- Selectable Voltage Reference: Internal 2.048V or External
- Internal High-Accuracy Oscillator Needs No External Components
- Automatic Offset Calibration
- Low Power
- Maximum 960µA Operating Current
- Maximum 400µA Shutdown Current
- Small 32-Pin 7mm x 7mm LQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
- Triplexed LCD Driver
- SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
- Evaluation Kit Available (Order MAX1494EVKIT)
アプリケーション/用途
- デジタルマルチメータ
- デジタルパネルメータ
- デジタル電圧計
- ハンドヘルド各種メータ
全て表示する
技術資料
| データシート | 3.5および4.5桁、LCDドライバ内蔵シングルチップADC | Oct 04, 2010 | |
| アプリケーションノート | 低コストセンサとA/Dインタフェースに関する設計上の検討事項 | ||
| アプリケーションノート | 高性能シグマ-デルタADCの50/60Hzノイズ除去に対するクロック耐性の効果について | ||
| チュートリアル | Delta-Sigma ADCs Replace Integrating ADCs for Panel Meters |
以下タイトルをクリックして詳細をご覧ください。
説明
MAX1494の評価システム(EVシステム)は、MAX1494の評価キット(EVキット)とマキシム68HC16MODULE-DIPマイクロコントローラ(µC)モジュールから構成されています。MAX1494 は、液晶ディスプレイ(LCD)ドライバを内蔵する低電力、4.5桁、アナログ-ディジタルコンバータ(ADC)です。評価ソフトウェアはWindows® 95/98/2000/XPで動作し、MAX1494の機能を実行するユーザインタフェースを備えています。
PCを使ってMAX1494を総合評価するには、総合評価システム(MAX1494EVC16)をお求めください。旧版のマキシム評価システムとともに68HC16MODULE-DIPモジュールを購入済みの場合や、他のµCベースのシステムでのカスタム使用の場合は、評価キット(MAX1494EVKIT)をお求めください。
また、このシステムはMAX1493CCJとMAX1495CCJも評価することができます。これらの製品の無料サンプルについてはお問い合わせください。｢ハードウェアの詳細｣の項を参照してください。
特長
- 実証済みPCBレイアウト
- 完全評価システム
- 使いやすいテストポイント搭載
- データロギングソフトウェア
- 完全実装および試験済み
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パラメーター
Parametric specs for Display-Oriented ADCs
| Resolution (±Counts) | 20000 |
| # Input Channels | 1 |
| Conv. Rate (ksps) (max) | 0.0025 |
| Data Bus | 7-Segment |
| Diff/S.E. Input | Diff. Only |
| Internal VREF (V) (nominal) | 2.048 |
| External VREF (V) (min) | 0 |
| External VREF (V) (max) | 2.048 |
| Bipolar VIN (±V) (max) | 2 |
| INL (±LSB) | 1 |
| Package/Pins | LQFP/32 |
| Budgetary Price (See Notes) | $10.82 @1k |
主な機能
- High Resolution
- MAX1494: 4.5 Digits (±19,999 Count)
- MAX1492: 3.5 Digits (±1999 Count)
- Sigma-Delta ADC Architecture
- No Integrating Capacitors Required
- No Autozeroing Capacitors Required
- > 100dB of Simultaneous 50Hz and 60Hz Rejection
- Operate from a Single 2.7V or 5.25V Supply
- Selectable Input Range of ±200mV or ±2V
- Selectable Voltage Reference: Internal 2.048V or External
- Internal High-Accuracy Oscillator Needs No External Components
- Automatic Offset Calibration
- Low Power
- Maximum 960µA Operating Current
- Maximum 400µA Shutdown Current
- Small 32-Pin 7mm x 7mm LQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
- Triplexed LCD Driver
- SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
- Evaluation Kit Available (Order MAX1494EVKIT)
アプリケーション/用途
- デジタルマルチメータ
- デジタルパネルメータ
- デジタル電圧計
- ハンドヘルド各種メータ
説明
The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated liquid crystal display (LCD) drivers operate from a single 2.7V to 5.25V power supply. They include an internal reference, a high-accuracy on-chip oscillator, and a triplexed LCD driver. An internal charge pump generates the negative supply needed to power the integrated input buffer for single-supply operation. The ADCs are configurable for either a ±2V or ±200mV input range and outputs its conversion results to an LCD and/or to a microcontroller (µC). µC communication is facilitated through an SPI™-/QSPI™-/MICROWIRE®-compatible serial interface. The MAX1492 is a 3.5-digit (±1999 count) device, and the MAX1494 is a 4.5-digit (±19,999 count) device.
The MAX1492/MAX1494 do not require external-precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits).
These devices also feature on-chip buffers for the differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, they use continuous internal-offset calibration and offer > 100dB simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a low-battery monitor.
The MAX1494 comes in a 32-pin, 7mm x 7mm LQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.
The MAX1492/MAX1494 do not require external-precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits).
These devices also feature on-chip buffers for the differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, they use continuous internal-offset calibration and offer > 100dB simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a low-battery monitor.
The MAX1494 comes in a 32-pin, 7mm x 7mm LQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.
技術資料
| データシート | 3.5および4.5桁、LCDドライバ内蔵シングルチップADC | Oct 04, 2010 | |
| アプリケーションノート | 低コストセンサとA/Dインタフェースに関する設計上の検討事項 | ||
| アプリケーションノート | 高性能シグマ-デルタADCの50/60Hzノイズ除去に対するクロック耐性の効果について | ||
| チュートリアル | Delta-Sigma ADCs Replace Integrating ADCs for Panel Meters |
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