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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 - ADS6125 (FS= 125 MSPS)

All plots are at 25°C, AVDD = DRVDD = 3.3 V, maximum rated sampling frequency, 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)

Amplitude − dB

−20

−40

−60

−80

−100

−120

−140

−160

FFT for 20 MHz INPUT SIGNAL

SFDR = 92 dBc

SINAD = 71.3 dBFS

SNR = 71.5 dBFS

THD = 87.9 dBc

f − Frequency − MHz

G001

Figure 9.

Amplitude − dB

−20

−40

−60

−80

−100

−120

−140

−160

FFT for 70 MHz INPUT SIGNAL

SFDR = 84.2 dBc

SINAD = 70.6 dBFS

SNR = 71 dBFS

THD = 82.7 dBc

f − Frequency − MHz

G002

Figure 10.

Amplitude − dB

−20

−40

−60

−80

−100

−120

−140

−160

FFT for 230 MHz INPUT SIGNAL

INTERMODULATION DISTORTION (IMD) vs FREQUENCY

SFDR = 74.1 dBc

fIN1 = 190.1 MHz, ±7 dBFS

SINAD = 66.5 dBFS

−20

fIN2 = 185.3 MHz, ±7 dBFS

SNR = 68.6 dBFS

2-Tone IMD = ±83.6 dBFS

THD = 71.4 dBc

−40

SFDR = ±81.3 dBFS

− dB

−60

Amplitude

−80

−100

−120

−140

−160

f − Frequency − MHz

G003

f − Frequency − MHz

G004

Figure 11.	Figure 12.
SFDR vs INPUT FREQUENCY	SNR vs INPUT FREQUENCY

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

	72			Gain = 0 dB								66
	68											64
	64											62
	0	50	100	150	200	250	300	350	400	450	500
				fIN − Input Frequency − MHz							G005
											G005

					Gain = 0 dB
		Gain = 3.5 dB
0	50	100	150	200	250	300	350	400	450	500
			fIN − Input Frequency − MHz							G006
										G006

Figure 13.

Figure 14.

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ADS6125, ADS6124

ADS6123, ADS6122

www.ti.com

SLAS560A–OCTOBER 2007–REVISED MARCH 2008

TYPICAL CHARACTERISTICS - ADS6125 (FS= 125 MSPS) (continued)

SFDR vs INPUT FREQUENCY (LVDS interface)

SNR vs INPUT FREQUENCY (LVDS interface)

	92											76
	88											74
	84					Gain = 3.5 dB						72
− dBc						Gain = 3.5 dB					dBFS
	80											70

SFDR	76										SNR −	68
SFDR				Gain = 0 dB							SNR −
				Gain = 0 dB
	72											66
	68											64
	64											62
	0	50	100	150	200	250	300	350	400	450	500
				fIN − Input Frequency − MHz							G007
											G007

					Gain = 0 dB
			Gain = 3.5 dB
0	50	100	150	200	250	300	350	400	450	500
			fIN − Input Frequency − MHz							G008
										G008

Figure 15.	Figure 16.
SFDR vs INPUT FREQUENCY ACROSS GAINS	SINAD vs INPUT FREQUENCY ACROSS GAINS

	95						76
			Input adjusted to get −1dBFS input				74
	90						74
	90
	85		3 dB				72
	85		3 dB	5 dB		dBFS
dBc				5 dB			70
	80				6 dB		70
	80				6 dB
−						−	68
SFDR					4 dB	SINAD	68
	75				4 dB
	75	0 dB					66
		0 dB					66

	70		1 dB				64
			1 dB				64
	65			2 dB			62
							62
	60						60
	0	100	200	300	400	500
			fIN − Input Frequency − MHz			G009
						G009

		Input adjusted to get −1dBFS input
	0 dB
	1 dB
		2 dB
	3 dB
	4 dB		6 dB
	5 dB		6 dB
	5 dB
0	100	200	300	400	500
	fIN	− Input Frequency − MHz			G010

Figure 17.

Figure 18.

SFDR − dBc

PERFORMANCE vs AVDD

PERFORMANCE vs DRVDD

88						78			96										73
86	fIN = 70.1 MHz					77					fIN = 10.1 MHz
86	DRVDD = 3.3 V			SFDR		77			94		AVDD = 3.3 V								72
84				SFDR		76			94						SNR				72
84						76	dBFS	dBc−							SNR					dBFS
82						75	dBFS	dBc−	92										71	dBFS
82						75

80						74	SNR−	SFDR												SNR−
78						73	SNR−	SFDR	90										70	SNR−
									90										70
														SFDR
76			SNR			72			88										69
			SNR						88										69
74						71
72						70			86										68
3.0	3.1	3.2	3.3	3.4	3.5	3.6				1.8	2.0	2.2	2.4	2.6	2.8	3.0	3.2	3.4	3.6
	AV		− Supply V oltage − V									DRVDD − Supply V oltage − V								G012
		DD					G011													G012
							G011

Figure 19.

Figure 20.

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ADS6125, ADS6124

ADS6123, ADS6122

www.ti.com

SLAS560A–OCTOBER 2007–REVISED MARCH 2008

TYPICAL CHARACTERISTICS - ADS6125 (FS= 125 MSPS) (continued)

PERFORMANCE vs TEMPERATURE

PERFORMANCE vs INPUT AMPLITUDE

	94						74			110
										100	SFDR (dBFS)
										100
	92				SFDR		73			90
dBc−SFDR								dBFS−SNR	dBFSdBc,−SFDR	90
dBc−SFDR	90						72	dBFS−SNR	dBFSdBc,−SFDR	80		SNR (dBFS)
										80		SNR (dBFS)

				SNR						70
				SNR
	88						71			60	SFDR (dBc)
										60

	86						70			50
	86						70
		fIN = 10.1 MHz								40
		fIN = 10.1 MHz													fIN = 10.1 MHz
	84						69			30					fIN = 10.1 MHz
	84						69			30
	−40	−20	0	20	40	60	80			−60	−50	−40	−30	−20	−10	0
				T − T emperature − °C				G013				Input Amplitude − dBFS
								G013

Figure 21.

Figure 22.

90
85
80
75	− dBFS
70	− dBFS
65	SNR
60
55

G014

PERFORMANCE vs CLOCK AMPLITUDE

PERFORMANCE vs INPUT CLOCK DUTY CYCLE

	92					72.0			92
	90	fIN = 20.1 MHz		SNR		71.5			91
				SNR
	88					71.0			90
− dBc	86					70.5	dBFS	− dBc	89
	84		SFDR			70.0			88

SFDR							SNR −	SFDR
SFDR	82					69.5	SNR −	SFDR	87
	80					69.0			86
	78					68.5			85
	76					68.0			84
	0.5	1.0	1.5	2.0	2.5	3.0
			Input Clock Amplitude − V PP				G015
							G015

								72.0
				SFDR				71.5
				SFDR
								71.0
								70.5	− dBFS
				SNR				70.0	− dBFS
				SNR					SNR
								69.5	SNR
								69.0
	fIN = 10.1 MHz							68.5
	fIN = 10.1 MHz
								68.0
30	35	40	45	50	55	60	65	70
			Input Clock Duty Cycle − %						G016
									G016

Figure 23.

Figure 24.

Occurence − %

OUTPUT NOISE HISTOGRAM	PERFORMANCE IN EXTERNAL REFERENCE MODE
(INPUTS TIED TO COMMON-MODE)

60		93	fIN = 20.1 MHz							76
RMS (LSB) = 0.497			fIN = 20.1 MHz
50			External Reference Mode
50		91								74
		91								74
40	dBc−			SNR							dBFS
	dBc−	89		SNR						72	dBFS
		89								72
30	SFDR										SNR−
	SFDR	87								70	SNR−
		87								70
20					SFDR
					SFDR
10		85								68
10
0		83								66
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057		1.30	1.35	1.40	1.45	1.50	1.55	1.60	1.65	1.70
		1.30	1.35	1.40	1.45	1.50	1.55	1.60	1.65	1.70
Output Code	G017			VVCM − VCM V oltage − V							G018

Figure 25.

Figure 26.

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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

TYPICAL CHARACTERISTICS - ADS6124 (FS= 105 MSPS)

Amplitude − dB

−20

−40

−60

−80

−100

−120

−140

−160

FFT for 20 MHz INPUT SIGNAL

SFDR = 88.2 dBc

SINAD = 71.3 dBFS

SNR = 71.5 dBFS

THD = 87.1 dBc

f − Frequency − MHz

G019

Figure 27.

Amplitude − dB

−20

−40

−60

−80

−100

−120

−140

−160

FFT for 80 MHz INPUT SIGNAL

SFDR = 84.8 dBc

SINAD = 70.8 dBFS

SNR = 71.1 dBFS

THD = 82.9 dBc

f − Frequency − MHz

G020

Figure 28.

Amplitude − dB

−20

−40

−60

−80

−100

−120

−140

−160

FFT for 230 MHz INPUT SIGNAL

INTERMODULATION DISTORTION (IMD) vs FREQUENCY

				SFDR = 74.9 dBc		0			fIN1 = 190.1 MHz, ±7 dBFS
				SFDR = 74.9 dBc					fIN1 = 190.1 MHz, ±7 dBFS
				SINAD = 65.8 dBFS		−20			fIN2 = 185.3 MHz, ±7 dBFS
				SNR = 67.1 dBFS					2-Tone IMD = ±82.4 dBFS
				THD = 73.3 dBc		−40			SFDR = ±87.8 dBFS
					− dB	−60
					Amplitude	−80
						−80
						−100
						−120
						−140
						−160
0	10	20	30	40	50	0	10	20	30	40	50
		f − Frequency − MHz			G021			f − Frequency − MHz			G022
					G021						G022

Figure 29.	Figure 30.
SFDR vs INPUT FREQUENCY	SNR vs INPUT FREQUENCY

	96											76
	92											74
												74
	88											72
	84					Gain = 3.5 dB						72
− dBc	84					Gain = 3.5 dB					dBFS
− dBc	80										dBFS	70
SFDR	76				Gain = 0 dB						SNR −	68
					Gain = 0 dB
	72
	72											66
	68											66
	68
	64											64
	64
	60											62
	0	50	100	150	200	250	300	350	400	450	500
				fIN − Input Frequency − MHz							G023
											G023

					Gain = 0 dB
			Gain = 3.5 dB
0	50	100	150	200	250	300	350	400	450	500
			fIN − Input Frequency − MHz							G024
										G024

Figure 31.

Figure 32.

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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

TYPICAL CHARACTERISTICS - ADS6124 (FS= 105 MSPS) (continued)

SFDR vs INPUT FREQUENCY (LVDS interface)

SNR vs INPUT FREQUENCY (LVDS interface)

	96											76
	92											74
												74
	88											72
	84											72
− dBc	84					Gain = 3.5 dB					dBFS
						Gain = 3.5 dB						70
	80											70
SFDR	76			Gain = 0 dB							SNR −	68
SFDR	72			Gain = 0 dB							SNR −
	72											66
	68											66
	68
	64											64
	64
	60											62
	0	50	100	150	200	250	300	350	400	450	500
				fIN − Input Frequency − MHz							G025
											G025

					Gain = 0 dB
	Gain = 3.5 dB
0	50	100	150	200	250	300	350	400	450	500
			fIN − Input Frequency − MHz							G026
										G026

Figure 33.	Figure 34.
SFDR vs INPUT FREQUENCY ACROSS GAINS	SINAD vs INPUT FREQUENCY ACROSS GAINS

	95							76
			Input adjusted to get −1dBFS input					74
	90							74
	90
	85			6 dB	5 dB			72
	85						dBFS
dBc	80							70
dBc	80
−							−	68
SFDR		0 dB					SINAD	68
	75	0 dB	1 dB			4 dB
	75		1 dB			4 dB		66
								66

	70			2 dB				64
								64

	65							62
					3 dB			62
					3 dB
	60							60
	0	100	200	300	400		500
			fIN − Input Frequency − MHz				G027
							G027

		Input adjusted to get −1dBFS input
	0 dB	1 dB
		1 dB
		2 dB
	3 dB	4 dB
		5 dB	6 dB
			6 dB
0	100	200	300	400	500
		fIN − Input Frequency − MHz			G028
					G028

Figure 35.	Figure 36.
PERFORMANCE vs AVDD	PERFORMANCE vs DRVDD

	92						78			98										77
	90	fIN = 70.1 MHz					77			96		fIN = 10.1 MHz								76
	90	DRVDD = 3.3 V					77			96		AVDD = 3.3 V								76
	88						76			94										75
										94		SFDR								75
− dBc	86						75	dBFS	− dBc			SFDR									dBFS
	86			SFDR			75			92										74
				SFDR						92										74
	84						74
SFDR	84						74	SNR −	SFDR												SNR −
	82						73			90										73
	82						73									SNR
										88						SNR				72
	80			SNR			72			88										72
	80			SNR			72
	78						71			86										71
	78						71
	76						70			84										70
	3.0	3.1	3.2	3.3	3.4	3.5	3.6				1.8	2.0	2.2	2.4	2.6	2.8	3.0	3.2	3.4	3.6
		AVDD − Supply V oltage − V						G029					DRVDD − Supply V oltage − V								G030
								G029													G030
				Figure 37.												Figure 38.

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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

TYPICAL CHARACTERISTICS - ADS6124 (FS= 105 MSPS) (continued)

PERFORMANCE vs TEMPERATURE

PERFORMANCE vs INPUT AMPLITUDE

	96
			SFDR
	94
− dBc	92
− dBc
SFDR	90		SNR
SFDR

	88
		fIN = 10.1 MHz
	86
	−40	−20	0	20	40	60	80
				T − T emperature − °C

75			110						90
			100		SFDR (dBFS)				85
74			90						80
		dBc, dBFS	90						80
73	− dBFS		80		SNR (dBFS)				75	− dBFS
73
			70						70

72	SNR	SFDR −	60						65	SNR
			60	SFDR (dBc)					65
				SFDR (dBc)
			50						60
71			50						60
71
			40						55
								fIN = 20.1 MHz
70			30						50
			−60	−50	−40	−30	−20	−10	0
	G031				Input Amplitude − dBFS					G032
	G031									G032

Figure 39.	Figure 40.
PERFORMANCE vs CLOCK AMPLITUDE	PERFORMANCE vs INPUT CLOCK DUTY CYCLE

	92		SNR			72.0			96
			SNR
	90					71.5			94
	88					71.0			92
− dBc	86		SFDR			70.5	dBFS	− dBc	90
	86					70.5			90
	84					70.0			88
SFDR	84					70.0	SNR −	SFDR	88
SFDR	82					69.5	SNR −	SFDR	86
	80					69.0			84
	78	fIN = 20.1 MHz				68.5			82
	76	fIN = 20.1 MHz				68.0			80
	76					68.0			80
	0.5	1.0	1.5	2.0	2.5	3.0
			Input Clock Amplitude − V PP				G033
							G033

								72.0
	fIN = 10.1 MHz			SFDR				71.5
				SFDR				71.5
								71.0
					SNR			70.5	− dBFS
								70.0	− dBFS
								69.5	SNR
								69.0
								68.5
								68.0
30	35	40	45	50	55	60	65	70
			Input Clock Duty Cycle − %						G034
									G034

Figure 41.

Figure 42.

PERFORMANCE IN EXTERNAL REFERENCE MODE

	96	fIN = 20.1 MHz							76
		fIN = 20.1 MHz
		External Reference Mode
	94								74
− dBc	92			SNR					72	dBFS
− dBc										dBFS
SFDR	90								70	SNR −
SFDR										SNR −
				SFDR
	88								68
	86								66
	1.30	1.35	1.40	1.45	1.50	1.55	1.60	1.65	1.70
				VVCM − VCM V oltage − V						G036
										G036

Figure 43.

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