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Московский технический университет связи и информатики

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Формирование и первичная обработка звуковых и видео сигналов

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ADS6125, ADS6124

ADS6123, ADS6122

www.ti.com

SLAS560A–OCTOBER 2007–REVISED MARCH 2008

TYPICAL CHARACTERISTICS - LOW SAMPLING FREQUENCIES

All plots are at 25°C, AVDD = DRVDD = 3.3 V, sine wave input clock, 1.5 VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain, CMOS output interface (unless otherwise noted)

FS = 40 MSPS

SFDR vs INPUT FREQUENCY

SNR vs INPUT FREQUENCY

	100											76
	96											74
	92											74
	92
	88										dBFS	72
− dBc	84											70
						Gain = 3.5 dB						70
	80
SFDR	80										SNR −
	76											68
	76

	72			Gain = 0 dB								66
	68			Gain = 0 dB
	68											64
	64											64
	64
	60											62
	0	50	100	150	200	250	300	350	400	450	500
				fIN − Input Frequency − MHz							G073
											G073

					Gain = 0 dB
		Gain = 3.5 dB
0	50	100	150	200	250	300	350	400	450	500
			fIN − Input Frequency − MHz							G074
										G074

Figure 78. Figure 79.

	FS = 25 MSPS
SFDR vs INPUT FREQUENCY	SNR vs INPUT FREQUENCY

	100											76
	90											74
	90
												72
− dBc	80					Gain = 3.5 dB					dBFS	70
												70

SFDR	70										SNR −	68
SFDR	70										SNR −
						Gain = 0 dB						66
	60					Gain = 0 dB
	60											64
												64
	50											62
	0	50	100	150	200	250	300	350	400	450	500
				fIN − Input Frequency − MHz							G075
											G075

					Gain = 0 dB
			Gain = 3.5 dB
0	50	100	150	200	250	300	350	400	450	500
			fIN − Input Frequency − MHz							G076
										G076

Figure 80.

Figure 81.

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Product Folder Link(s): ADS6125, ADS6124 ADS6123, ADS6122

ADS6125, ADS6124

ADS6123, ADS6122

www.ti.com

SLAS560A–OCTOBER 2007–REVISED MARCH 2008

COMMON PLOTS

COMMON-MODE REJECTION RATIO vs FREQUENCY	POWER DISSIPATION vs
	SAMPLING FREQUENCY (DDR LVDS and CMOS)

	0							0.8
	−10							0.7
								0.7
	−20						W	0.6
							−
	−30						Power Dissipation
	−30
CMRR − dBc	−40							0.5
	−40
	−50							0.4
	−60							0.3
								0.3
	−70
	−70						−	0.2
							−
	−80						D
							D
							P
	−90							0.1
	−90
	−100							0.0
	0	50	100	150	200	250	300
			f − Frequency − MHz				G077
							G077

	fIN = 2.5 MHz
	CL = 5 pF
		LVDS
			CMOS
0	25	50	75	100	125
		fS − Sampling Frequency − MSPS			G078
					G078

Figure 82.

Figure 83.

DRVDD current vs

SAMPLING FREQUENCY across load capacitance (CMOS)

	30
				1.8 V, No Load
	25			1.8 V, 5 pF
− mA				1.8 V, 5 pF
− mA	20		3.3 V, No Load
Current	15		3.3 V, 5 pF
	15	3.3 V, 10 pF

DD
DD
DRV	10
DRV
	5
	0
	0	25	50	75	100	125
			fS − Sampling Frequency − MSPS			G079
						G079

Figure 84.

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Product Folder Link(s): ADS6125, ADS6124 ADS6123, ADS6122

ADS6125, ADS6124

ADS6123, ADS6122

www.ti.com

SLAS560A–OCTOBER 2007–REVISED MARCH 2008

Contour Plots Across Input and Sampling Frequencies

	125
	120	90	84		84					75	72			66
					84					75
		87			81		78					69
	110	87			81		78					69
	110	84		84
				84
MSPS
	100														63
	100
			87		81						75			66
-					81
Frequency	90
	90			84
	90			84					78			72
									78			72
			90
	80		90
		87	87			81							69		60
	70	87				81							69		60

-Sampling															63
															63
	60									78
	60
				84						75
				84
	50
S	50		90
S
f											72	69	66
												69

	40
		93		84	81		78	75						63	60
		93						75
	30
	30
	25
	10		50	100	150		200		250	300		350	400	450	500
								fIN - Input Frequency - MHz
			60	65		70			75	80		85		90	95
									SFDR - dBc						M0049-15
															M0049-15
				Figure 85. SFDR Contour (No gain, FS = 2 VPP)
	125		84
	120		84
	120				84					75
			87	87	84			78		75
		87		87		81
		87				81
	110												69
-MSPS													69
	100			87								72
	100														66
			90												66
			90
	90									75
Frequency	90									75
		90			87			81		78
	80	90			87
	80		90
				87			84							69
	70						84							69

-Sampling			93	90											66
			93	90								75	72		66
		93								81		75	72
	60	93								81
	60
										78
	50			90
S	50			90
f			90
			90
	40		93		87			78							63
					87

					84	81					72		69
			93							75	72
	30		93							75
	30
	25
	10		50	100	150		200		250	300		350	400	450	500
								fIN - Input Frequency - MHz

60	65	70	75	80	85	90	95

SFDR - dBc

M0049-16

Figure 86. SFDR Contour (with 3.5 dB Coarse gain, FS = 1.34 VPP)

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Product Folder Link(s): ADS6125, ADS6124 ADS6123, ADS6122

ADS6125, ADS6124

ADS6123, ADS6122

www.ti.com

SLAS560A–OCTOBER 2007–REVISED MARCH 2008

Contour Plots Across Input and Sampling Frequencies (continued)

Figure 87. SNR Contour (No gain, FS = 2 VPP)

Figure 88. SNR Contour (with 3.5 dB Coarse gain, FS = 1.34 VPP)

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Product Folder Link(s): ADS6125, ADS6124 ADS6123, ADS6122

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TYPICAL CHARACTERISTICS - LOW SAMPLING FREQUENCIES

FS = 40 MSPS

FS = 25 MSPS

COMMON PLOTS

Contour Plots Across Input and Sampling Frequencies