Maxim MAX12557 manual THD, Sfdr vs. Clock Speed, FIN = 70MHz, AIN = -0.5dBFS

Dual, 65Msps, 14-Bit, IF/Baseband ADC

Typical Operating Characteristics (continued)

(VDD = 3.3V, OVDD = 2.0V, GND = 0, REFIN = REFOUT (internal reference mode), CL ≈ 5pF at digital outputs, VIN = -0.5dBFS, DIFFCLK/SECLK = OVDD, PD = GND, G/T = GND, fCLK = 65MHz (50% duty cycle), TA = +25°C, unless otherwise noted.)

SNR, SINAD vs. ANALOG INPUT AMPLITUDE	-THD, SFDR vs. ANALOG INPUT AMPLITUDE
(fCLK = 65.00352MHz, fIN = 175MHz)	(fCLK = 65.00352MHz, fIN = 175MHz)

SNR, SINAD vs. CLOCK SPEED (fIN = 70MHz, AIN = -0.5dBFS)

	80		toc13		95
	SNR
			MAX12557
	70				85
(dB)	60	SINAD		(dBc)	75
SNR, SINAD	50			-THD, SFDR	65
	40				55
	30				45
	20				35
	-55 -50 -45 -40 -35 -30 -25 -20 -15 -10	-5	0

		toc14		80
SFDR		MAX12557		76
			(dB)	72
			SINAD
-THD
			SNR,	68
				64
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10	-5	0		60

					SNR				MAX12557 toc15
						SINAD
20	25	30	35	40	45	50	55	60	65

MAX12557

AIN (dBFS) AIN (dBFS)

fCLK (MHz)

-THD, SFDR vs. CLOCK SPEED	SNR, SINAD vs. CLOCK SPEED	-THD, SFDR vs. CLOCK SPEED
(fIN = 70MHz, AIN = -0.5dBFS)	(fIN = 175MHz, AIN = -0.5dBFS)	(fIN = 175MHz, AIN = -0.5dBFS)

	90	SFDR								toc16		80
										MAX12557
	85											76
(dBc)	80				-THD						(dB)	72
SFDR											SINAD
	75
-THD,	70										SNR,	68
	65											64
	60											60
	20	25	30	35	40	45	50	55	60	65
					fCLK (MHz)

									toc17	90
						SNR			MAX12557	85
									SFDR (dBc)	80
					SINAD					75
									-THD,
										70
										65
20	25	30	35	40	45	50	55	60	65	60
				fCLK (MHz)

									toc18
					SFDR				MAX12557
			-THD
20	25	30	35	40	45	50	55	60	65
				fCLK (MHz)

SNR, SINAD vs. ANALOG SUPPLY VOLTAGE	-THD, SFDR vs. ANALOG SUPPLY VOLTAGE	SNR, SINAD vs. ANALOG SUPPLY VOLTAGE
(fCLK = 65.00352MHz, fIN = 70MHz)	(fCLK = 65.00352MHz, fIN = 70MHz)	(fCLK = 65.00352MHz, fIN = 175MHz)

	80						toc19		95
	76		SNR				MAX12557		90
SINAD (dB)								SFDR (dBc)	85
	72		SINAD						80
SNR,	68							THD,	75
								-
									70
	64								65
	60								60
	3.0	3.1	3.2	3.3	3.4	3.5	3.6

						toc20		75
				SFDR		MAX12557
								72
							(dB)	69
			-THD				SINAD
							SNR,	66
								63
								60
3.0	3.1	3.2	3.3	3.4	3.5	3.6

		SNR				toc21
						MAX12557
			SINAD
3.0	3.1	3.2	3.3	3.4	3.5	3.6

VDD (V)

VDD (V) VDD (V)

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