不错的资料！常用晶体的工作频率及主要用途

1万 · 2009-10-16 00:44

Commonly used crystal frequencies

Crystals can be manufactured for oscillation over a wide range of frequencies, from a few kilohertz up to several hundred megahertz. Many applications call for a crystal oscillator frequency conveniently related to some other desired frequency, so certain crystal frequencies are made in large quantities and stocked by electronics distributors.

Frequency (MHz)	Primary uses
0.032768	Real-time clocks, quartz watches and clocks; allows binary division to 1 Hz signal (215×1 Hz)
1.8432	UART clock; allows integer division to common baud rates. (213×32×52; 16×115,200 baud or 96×16×1,200 baud)
2.4576	UART clock; allows integer division to common baud rates up to 38,400. (215×31×52; 64×38,400 baud or 2048×1,200 baud)
3.2768	Allows binary division to 100 Hz (32,768×100 Hz, or 215×100 Hz)
3.575611	PAL M color subcarrier
3.579545	NTSC M color subcarrier. Because these are very common and inexpensive they are used in many other applications, for example DTMF generators
3.582056	PAL N color subcarrier
3.686400	UART clock (2×1.8432 MHz); allows integer division to common baud rates
4.096000	Allows binary division to 1 kHz (212×1 kHz)
4.194304	Real-time clocks, divides to 1 Hz signal (222×1 Hz)
4.332	The RDS signal bit rate is at 1.1875 kbit/s. While the frequency of 4.332 MHz is the most commonly used crystal resonator, its multiples (2×4.332 MHz = 8.664 MHz or 4×4.332MHz = 17.328 MHz) have been used also.
4.43361875	PAL B/D/G/H/I and NTSC M4.43 color subcarrier
4.9152	Used in CDMA systems; divided to 1.2288 MHz baseband frequency as specified by J-STD-008
6.144	Digital audio systems - DAT, MiniDisc, sound cards; 128×48 kHz (27×48 kHz). Also allows integer division to common UART baud rates up to 38,400.
6.5536	Allows binary division to 100 Hz (65,536×100 Hz, or 216×100 Hz); used also in red boxes
7.15909	NTSC M color subcarrier (2×3.579545 MHz)
7.3728	UART clock (4×1.8432 MHz); allows integer division to common baud rates
8.86724	PAL B/G/H color subcarrier (2×4.433618 MHz)
9.216	Allows integer division to 1024 kHz and binary division to lower frequencies that are whole multiples of 1 Hz.
9.83040	Used in CDMA systems (2×4.9152 MHz); divided to 1.2288 MHz baseband frequency
10.245	Used in radio receivers; mixes with 10.7 MHz intermediate frequency (IF) yielding 455 kHz signal, a common second IF for FM radio [6]
11.0592	UART clock (6×1.8432 MHz); allows integer division to common baud rates
11.2896	Used in compact disc digital audio systems and CDROM drives; allows binary division to 44.1 kHz (256×44.1 kHz), 22.05 kHz, and 11.025 kHz
12.0000	Used in USB systems as the reference clock for the full-speed PHY rate of 12 Mbit/s, or multiplied up using a PLL to clock high speed PHYs at 480 Mbit/s
12.288	Digital audio systems - DAT, MiniDisc, sound cards; 256×48 kHz (28×48 kHz). Also allows integer division to common UART baud rates up to 38400.
13.500	Master clock for PAL/NTSC DVD players, Digital TV receivers, etc. (13.5 MHz is an exact multiple of the PAL and NTSC line frequencies)
13.56	Common contactless smartcard frequency (ISO/IEC 14443)
13.875	Used in some teletext circuits; 2×6.9375 MHz (clock frequency of PAL B teletext; SECAM uses 6.203125 MHz, NTSC M uses 5.727272 MHz, PAL G uses 6.2031 MHz, and PAL I uses 4.4375 MHz clock)
14.31818	NTSC M color subcarrier (4×3.579545 MHz). Common seed clock for modern PC motherboard clock generator chips, also common on VGA cards.
14.7456	UART clock (8×1.8432 MHz); allows integer division to common baud rates
16.368	Commonly used for down-conversion and sampling in GPS-receivers. Generates intermediate frequency signal at 4.092 MHz. 16.3676 or 16.367667 MHz are sometimes used to avoid perfect lineup between sampling frequency and GPS spreading code.
16.9344	Used in compact disc digital audio systems and CDROM drives; allows integer division to 44.1 kHz (384×44.1 kHz), 22.05 kHz, and 11.025 kHz. Also allows integer division to common UART baud rates.
17.734475	PAL B/G/H color subcarrier (4×4.433618 MHz)
18.432	UART clock (10×1.8432 MHz); allows integer division to common baud rates. Also allows integer division to 48 kHz (384×48 kHz), 96 kHz, and 192 kHz sample rates used in high-end digital audio.
19.6608	Used in CDMA systems (4×4.9152); divided to 1.2288 MHz baseband frequency
20.000	10 Mbit/s ethernet
22.1184	UART clock (12×1.8432 MHz); allows integer division to common baud rates
24	full-speed USB (24MHz * 20 = 480Mbit/s); LCD monitor some MCU
24.576	Digital audio systems - DAT, MiniDisc, AC'97, sound cards; 512×48 kHz (29×48 kHz); also used as bus reference clock in Firewire systems
25.000	Fast Ethernet MII clock (100 Mbps/4-bit nibble)
25.175	Common Video Graphics Array pixel clock (i.e., 640x350@70 Hz,640x400@70 Hz, 640x480@60 Hz)[7]
26.000	Commonly used as a reference clock for GSM and UMTS handsets. (26 MHz is exactly 96 times the GSM bit rate)
26.2144	Popular for 102.4 kS/s, 204.8 kS/s or similar sampling systems, when a power-of-two size FFT follows the sampling. In this case the FFT frequency bins end up to be at "nice" frequencies for humans. Also allows integer division to 25 Hz and multiples of 25 Hz (50 Hz, 100 Hz, 200 Hz); 26.2144 MHz = 100 x 218 = 25 x 220.
27.000	Master clock for PAL/NTSC DVD players, Digital TV receivers, some modems etc. (27 MHz is an exact multiple of the PAL and NTSC line frequencies)
28.224 MHz	used in some modems
28.375 MHz	Master clock for some PAL CCD cameras; 2 periods per pixel, 1816 periods per scan line, 567500 periods per frame
28.636 MHz	Master clock for some NTSC CCD cameras
29.4912	UART clock (16×1.8432 MHz); allows integer division to common baud rates
30.0000	common CPU clock
33.33	common CPU clock
40.000	common CPU clock, WiFi, OFDM
50.000	Fast Ethernet (2×25 MHz)
66.667	common CPU clock
80.0000	common CPU clock