CD74ACT297
- Speed of Bipolar FCT, AS, and S, With Significantly Reduced Power Consumption
- Digital Design Avoids Analog Compensation Errors
- Easily Cascadable for Higher-Order Loops
- Useful Frequency Range
- DC to 110 MHz Typical (K CLK)
- DC to 70 MHz Typical (I/D CLK)
- Dynamically Variable Bandwidth
- Very Narrow Bandwidth Attainable
- Power-On Reset
- Output Capability
- Standard: XORPD OUT, ECPD OUT
- Bus Driver: I/D OUT
- SCR Latch-Up-Resistant CMOS Process and Circuit Design
- Balanced Propagation Delays
- ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015
The CD74ACT297 provides a simple, cost-effective solution to high-accuracy, digital, phase-locked-loop applications. This device contains all the necessary circuits, with the exception of the divide-by-N counter, to build first-order phase-locked loops as shown in Figure 1.
Both exclusive-OR phase detectors (XORPDs) and edge-controlled (ECPD) phase detectors are provided for maximum flexibility.
Proper partitioning of the loop function, with many of the building blocks external to the package, makes it easy for the designer to incorporate ripple cancellation or to cascade to higher-order phase-locked loops.
The length of the up/down K counter is digitally programmable according to the K-counter function table. With A, B, C, and D all low, the K counter is disabled. With A high and B, C, and D low, the K counter is only three stages long, which widens the bandwidth, or capture range, and shortens the lock time of the loop. When A, B, C, and D are programmed high, the K counter becomes 17 stages long, which narrows the bandwidth, or capture range, and lengthens the lock time. Real-time control of loop bandwidth by manipulating the A-through-D inputs can maximize the overall performance of the digital phase-locked loop.
This device performs the classic first-order phase-locked-loop function without using analog components. The accuracy of the digital phase-locked loop (DPLL) is not affected by VCC and temperature variations, but depends solely on accuracies of the K clock (K CLK), increment/decrement clock (I/D CLK), and loop propagation delays. The I/D clock frequency and the divide-by-N modulos determine the center frequency of the DPLL. The center frequency is defined by the relationship fc = I/D clock/2N (Hz).
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技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | Digital Phase-Locked Loop datasheet (Rev. D) | 2002年 6月 27日 | |
| Application note | Implications of Slow or Floating CMOS Inputs (Rev. E) | 2021年 7月 26日 | ||
| Selection guide | Logic Guide (Rev. AB) | 2017年 6月 12日 | ||
| Application note | Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) | 2015年 12月 2日 | ||
| User guide | LOGIC Pocket Data Book (Rev. B) | 2007年 1月 16日 | ||
| Application note | Semiconductor Packing Material Electrostatic Discharge (ESD) Protection | 2004年 7月 8日 | ||
| Application note | Selecting the Right Level Translation Solution (Rev. A) | 2004年 6月 22日 | ||
| Application note | TI IBIS File Creation, Validation, and Distribution Processes | 2002年 8月 29日 | ||
| Application note | CMOS Power Consumption and CPD Calculation (Rev. B) | 1997年 6月 1日 | ||
| Application note | Designing With Logic (Rev. C) | 1997年 6月 1日 | ||
| Application note | Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc | 1996年 4月 1日 |
設計與開發
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| 封裝 | 引腳 | 下載 |
|---|---|---|
| SOIC (D) | 16 | 檢視選項 |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點