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如何設計高可靠6G晶振振蕩電路X1G0044010011

來源：金洛鑫瀏覽：- 發布日期：2023-07-24 17:23:50【大中小】

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為了獲得穩定的振蕩，通常情況下石英晶體單元與振蕩電路的匹配十分重要。若電路結構與晶體單元的匹配中存在問題，就會產生頻率不夠穩定、停止起振或振蕩不穩定等問題。石英晶體單元與微機一起使用時需要評估振蕩電路。確認該石英晶體單元與振蕩電路的匹配之際，至少要對振蕩頻率（頻率匹配）、振蕩裕度（負阻抗）和激勵功率的三項進行評估。我們在上篇中已經說明了有關頻率匹配的內容，這次將解說振蕩裕度（負阻抗）和激勵功率的評估方法。

【1】振蕩裕度（負阻抗）的評估

在石英晶體單元的 HOT 端子插入阻抗后檢測是否起振（測試負阻抗 RN），是評估振蕩電路的負阻抗特性與振蕩裕度的簡單方法。振蕩電路的能力可以通過改變插入的阻抗值（損失的大小）進行測試。圖 1 是測試負阻抗的電路圖。負阻抗的絕對值等于所插入的阻抗值 r 和石英晶體單元連接負載時的等效阻抗（Re）之和。算式（1）

石英晶體單元連接負載時的等效阻抗（Re）用以下算式（2）求出。

R1是石英晶體單元無負載電容時的等效串聯阻抗。

使用在上次《振蕩電路評估方法（1）》中所介紹的石英晶體單元常數（R1=33.7Ω、C0=1.11pF、CL=7.8pF），代入上述算式（2）后可算出等效阻抗（Re）為 44Ω。

這時的 R1是石英晶體單元的實測值，而不是參數值。假設 R1的最大值是 57Ω，Re 受負載電容的影響而增加到 74?，請注意。

圖 2 表示插入阻抗以測試負阻抗之例。

表 1：基于負阻抗計算振蕩裕度（RN/Re）之例

插入阻抗（Ω）	負阻抗（計算值、Ω）	振蕩裕度	用示波器進行的起振確認
500	545	7	OK
1000	1045	14	OK
1600	1645	22	OK
2000	2045	-	不起振

圖 2：插入阻抗測試負阻抗的情景

在圖 2 的狀態下用示波器確認波形。逐漸增大插入的阻抗值 r，尋找不起振的阻抗點。這時忽略因插入阻抗而引起的振蕩輸出下降和振蕩頻率的變化，只單純判定是否起振。

決定負阻抗 RN之后，計算振蕩裕度 RN/Re（上述表 1）。

需要注意的是振蕩裕度低將引發各種不良現象，例如因電路特性不均而造成的振蕩不穩定、不起振或起振時間變長等。

振蕩裕度為 5 倍以上時，意味著振蕩電路具備激勵石英晶體單元的足夠能力（增幅度），通常不會發生問題。如果振蕩裕度在 5 倍以下，則建議變更振蕩電路的電路常數，或者增大負阻抗 RN，或者減小石英晶體單元的等效串聯阻抗 Re，使振蕩裕度保持在 5 倍以上。

雖然降低微調電容器（Cg、Cd）或限流電阻（Rd）等振蕩電路的電路常數可使負阻抗變大，振蕩裕度也將隨之變大，但需要提醒的是，振蕩電路的負載電容隨著電路常數的變化而變，這將促使振蕩頻率也出現變化。欲降低石英晶體單元的等效串聯電阻 R1時，需要向石英晶體生產商提出要求。

【2】激勵功率的評估

激勵功率指石英晶體單元振蕩時所消耗的電力。通常，激勵功率最好控制在石英晶體單元的規格參數內，一般在約 100μW 以下，但需注意的是各石英晶體生產商之間略有不同。

激勵功率過大時將引起振蕩頻率的變動、穩定度下降、等效電路參數變化或頻率失真等現象。激勵功率偏高還可能導致反復出現異常振蕩、引發故障的惡果。激勵功率（P）用下列算式（3）求出。

這里的 I 是流過石英晶體單元的電流，Re是石英晶體單元帶負載時的等效電阻。如果激勵功率超過了規格參數，就需要調整振蕩電路的常數，使流過石英晶體單元的電流變小。降低 Cg 或 Cd 可使激勵功率變小，但振蕩電路的負載電容也將隨之而變。最簡單的方法是增大 Rd，但損失將隨之增大、負阻抗將變小。

激勵功率不能直接測定。

把測試針放在與振蕩電路相組合的石英晶體單元 HOT 端子，用示波器測試施加電壓 Vpp，基于實測值計算流過石英晶體單元的電流。

圖 3 表示測試激勵功率時的情景。

把電流探針插在評估用石英晶體單元的端子上后，裝到印制板的石英晶體單元部。通過示波器確認振蕩后，根據波形測出 Vpp。

例如，假設從示波器的波形得出 Vpp=0.205V、測試探針的設定為 1mA/div、探針阻抗為 50Ω、示波器的測試量程為 50mV/div 以及石英晶體單元帶負載時等效電阻 Re為 45Ω，那么 Vpp/50[mV/div]=205/50=4.1div

4.1/（2√2）=1.45div

50[mV/div]/50Ω=1mA/div，

由此得出流過石英晶體單元的電流 I 為 1.45div×1mA/div=1.45mA。

根據前頁算式（3）計算得出激勵功率 P 為 1.45×1.45×45=95μW。

圖 3：測試激勵功率的情景

【3】結尾

我們分兩次解說了振蕩電路的評估方法，制作最佳振蕩電路需要對（1）頻率匹配、（2）振蕩裕度（負阻抗）和（3）激勵功率分別進行最佳化。

雖然對上述任意一項均設定最佳電路常數的做法最為理想，但實際工作中也會出現不適合的情況。我們在最后匯總了這時的應對方法。

表 2：頻率匹配、負阻抗及激勵功率的評估結果與應對方法

頻率匹配	負阻抗	激勵功率	應對方法
OK	OK	OK	A
OK	OK	NG	B
OK	NG	OK	C
NG	OK	OK	D
NG	NG	NG	E
OK	NG	NG	F
NG	OK	NG	G
NG	NG	OK	H

A.使用評估時的電路常數即可。

B.需要重審有關激勵功率的石英晶體單元規格參數。請確認本次評估結果的激勵功率是否影響石英晶體單元。

C.需要重審有關負阻抗的石英晶體單元規格參數。請考慮能否變更石英晶體單元等效串聯阻抗的規格參數 R1，使振蕩裕度達到 5 倍以上。

D.關于頻率匹配，需要考慮把事先規定的標準負載電容調整到裝配石英晶體單元的實際基板的負載電容。

E.需要采取組合“B＋C＋D”的應對方法。

F.需要采取組合“B＋C”的應對方法。

G.需要采取組合“B＋D”的應對方法。

H.需要采取組合“C＋D”的應對方法。

謹望上次及本次的信息能成為設計高可靠振蕩電路之際的參考

編碼	型號	頻率	尺寸	輸出方式	電源電壓	工作溫度	頻率偏差
X1G0023510013	SG-770SCD	156.250000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	0 to 70 °C	+/-50 ppm
X1G0023510014	SG-770SCD	187.500000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	0 to 70 °C	+/-50 ppm
X1G0023510019	SG-770SCD	125.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510026	SG-770SCD	62.500000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510027	SG-770SCD	133.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510028	SG-770SCD	106.250000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510029	SG-770SCD	155.520000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510032	SG-770SCD	133.330000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510033	SG-770SCD	148.500000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510035	SG-770SCD	125.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	0 to 70 °C	+/-50 ppm
X1G0023510044	SG-770SCD	155.520000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	0 to 70 °C	+/-50 ppm
X1G0023510053	SG-770SCD	50.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510122	SG-770SCD	80.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510123	SG-770SCD	133.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510125	SG-770SCD	150.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510126	SG-770SCD	50.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-20 to 70 °C	+/-50 ppm
X1G0023510128	SG-770SCD	80.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-20 to 70 °C	+/-50 ppm
X1G0023510129	SG-770SCD	53.125000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510130	SG-770SCD	133.333300 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510131	SG-770SCD	75.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510132	SG-770SCD	98.304000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023510808	SG-770SCD	200.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-50 ppm
X1G0023610004	SG-770SDD	155.520000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	2.375 to 2.625 V	-40 to 85 °C	+/-50 ppm
X1G0023610007	SG-770SDD	125.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	2.375 to 2.625 V	-40 to 85 °C	+/-50 ppm
X1G0023610008	SG-770SDD	156.250000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	2.375 to 2.625 V	-40 to 85 °C	+/-50 ppm
X1G0023610012	SG-770SDD	125.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	2.375 to 2.625 V	-20 to 70 °C	+/-50 ppm
X1G0023610103	SG-770SDD	122.880000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	2.375 to 2.625 V	-40 to 85 °C	+/-50 ppm
X1G0023610105	SG-770SDD	150.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	2.375 to 2.625 V	-40 to 85 °C	+/-50 ppm
X1G0028210009	SG-771PCD	156.253906 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210010	SG-771PCD	156.258600 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-10 to 70 °C	+/-25 ppm
X1G0028210107	SG-771PCD	156.250000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210109	SG-771PCD	161.132800 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210115	SG-771PCD	106.250000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210116	SG-771PCD	133.000000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210117	SG-771PCD	133.333300 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210118	SG-771PCD	98.304000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0028210121	SG-771PCD	156.250000 MHz	7.00 x 5.00 x 1.80 mm	LV-PECL	3.135 to 3.465 V	-40 to 85 °C	+/-30 ppm
X1G0042410001	SG3225VAN	125.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410002	SG3225VAN	125.006250 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410004	SG3225VAN	100.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410005	SG3225VAN	200.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410006	SG3225VAN	400.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410007	SG3225VAN	106.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410008	SG3225VAN	212.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410009	SG3225VAN	74.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410010	SG3225VAN	148.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410011	SG3225VAN	75.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410012	SG3225VAN	150.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410014	SG3225VAN	156.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410015	SG3225VAN	312.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410016	SG3225VAN	312.515625 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410017	SG3225VAN	161.132800 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410020	SG3225VAN	125.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410021	SG3225VAN	125.006250 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410023	SG3225VAN	100.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410024	SG3225VAN	200.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410025	SG3225VAN	400.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410026	SG3225VAN	106.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410027	SG3225VAN	212.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410028	SG3225VAN	74.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410029	SG3225VAN	148.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410030	SG3225VAN	75.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410031	SG3225VAN	150.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410033	SG3225VAN	156.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410034	SG3225VAN	312.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410035	SG3225VAN	312.515625 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410036	SG3225VAN	161.132800 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410039	SG3225VAN	125.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410040	SG3225VAN	125.006250 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410042	SG3225VAN	100.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410043	SG3225VAN	200.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410044	SG3225VAN	400.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410045	SG3225VAN	106.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410046	SG3225VAN	212.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410047	SG3225VAN	74.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410048	SG3225VAN	148.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410049	SG3225VAN	75.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410050	SG3225VAN	150.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410052	SG3225VAN	156.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410053	SG3225VAN	312.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410054	SG3225VAN	312.515625 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410055	SG3225VAN	161.132800 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410058	SG3225VAN	125.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410059	SG3225VAN	125.006250 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410061	SG3225VAN	100.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410062	SG3225VAN	200.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410063	SG3225VAN	400.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410064	SG3225VAN	106.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410065	SG3225VAN	212.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410066	SG3225VAN	74.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410067	SG3225VAN	148.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410068	SG3225VAN	75.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410069	SG3225VAN	150.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410071	SG3225VAN	156.250000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410072	SG3225VAN	312.500000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410073	SG3225VAN	312.515625 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410074	SG3225VAN	161.132800 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410079	SG3225VAN	50.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410080	SG3225VAN	68.750000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410083	SG3225VAN	50.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410084	SG3225VAN	68.750000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410087	SG3225VAN	50.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410088	SG3225VAN	68.750000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410092	SG3225VAN	68.750000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042410100	SG3225VAN	133.333333 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-20 to 70 °C	+/-50 ppm
X1G0042410101	SG3225VAN	148.350000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042410102	SG3225VAN	114.285000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410103	SG3225VAN	250.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410104	SG3225VAN	350.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410105	SG3225VAN	80.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410106	SG3225VAN	98.304000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042410108	SG3225VAN	297.000000 MHz	3.20 x 2.50 x 1.20 mm	LVDS	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510001	SG3225EAN	100.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510002	SG3225EAN	156.250000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-20 to 70 °C	+/-20 ppm
X1G0042510003	SG3225EAN	125.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510004	SG3225EAN	125.006250 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510006	SG3225EAN	200.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510007	SG3225EAN	400.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510008	SG3225EAN	106.250000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510009	SG3225EAN	212.500000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510010	SG3225EAN	74.250000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510011	SG3225EAN	148.500000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510012	SG3225EAN	75.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510013	SG3225EAN	150.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510014	SG3225EAN	155.520000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510015	SG3225EAN	156.250000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510016	SG3225EAN	312.500000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510017	SG3225EAN	312.515625 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510018	SG3225EAN	161.132800 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-50 ppm
X1G0042510021	SG3225EAN	125.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510022	SG3225EAN	125.006250 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510024	SG3225EAN	100.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510025	SG3225EAN	200.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510026	SG3225EAN	400.000000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510027	SG3225EAN	106.250000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510028	SG3225EAN	212.500000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm
X1G0042510029	SG3225EAN	74.250000 MHz	3.20 x 2.50 x 1.20 mm	LV-PECL	2.250 to 3.630 V	-40 to 85 °C	+/-30 ppm

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