米6体育平台手机版

ZHCSIJ3C June 2008 – July 2018 ADS7950 , ADS7951 , ADS7952 , ADS7953 , ADS7954 , ADS7955 , ADS7956 , ADS7957 , ADS7958 , ADS7959 , ADS7960 , ADS7961

PRODUCTION DATA.

7.6 Electrical Characteristics: ADS7950, ADS7951, ADS7952, ADS7953

VA = 2.7 V to 5.25 V, VBD = 1.7 V to +VA, V_REF = 2.5 V ± 0.1 V, T_A = –40°C to 125°C, f_sample = 1 MHz (unless otherwise noted)

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
ANALOG INPUT
Full-scale input span⁽¹⁾		Range 1	0		V_REF	V
Full-scale input span⁽¹⁾		Range 2 while 2xV_REF ≤ +VA	0		2*V_REF	V
Absolute input range		Range 1	–0.2	V_REF + 0.2		V
Absolute input range		Range 2 while 2xV_REF ≤ +VA	–0.2	2*V_REF + 0.2		V
Input capacitance				15		pF
Input leakage current		T_A = 125°C		61		nA
SYSTEM PERFORMANCE
Resolution				12		Bits
No missing codes		ADS795XSB⁽²⁾	12			Bits
No missing codes		ADS795XS⁽²⁾	11			Bits
Integral linearity		ADS795XSB⁽²⁾	–1	±0.5	1	LSB⁽³⁾
Integral linearity		ADS795XS⁽²⁾	–1.5	±0.75	1.5	LSB⁽³⁾
Differential linearity		ADS795XSB⁽²⁾	–0.99	±0.5	1	LSB
Differential linearity		ADS795XS⁽²⁾	–2	±0.75	1.5	LSB
Offset error⁽⁴⁾			–3.5	±1.1	3.5	LSB
Gain error		Range 1	–2	±0.2	2	LSB
Gain error		Range 2		±0.2		LSB
Total unadjusted error (TUE)				±2		LSB
SAMPLING DYNAMICS
Conversion time		20 MHz SCLK			800	ns
Acquisition time			325			ns
Maximum throughput rate		20 MHz SCLK			1	MHz
Aperture delay				5		ns
Step response				150		ns
Overvoltage recovery				150		ns
DYNAMIC CHARACTERISTICS
Total harmonic distortion⁽⁵⁾		100 kHz		–82		dB
Signal-to-noise ratio		100 kHz, ADS795XSB⁽²⁾	70	71.7		dB
Signal-to-noise ratio		100 kHz, ADS795XS⁽²⁾	70	71.7		dB
Signal-to-noise + distortion		100 kHz, ADS795XSB⁽²⁾	69	71.3		dB
Signal-to-noise + distortion		100 kHz, ADS795XS⁽²⁾	68	71.3		dB
Spurious free dynamic range		100 kHz		84		dB
Small signal bandwidth		At –3 dB		47		MHz
Channel-to-channel crosstalk		Any off-channel with 100 kHz, Full-scale input to channel being sampled with DC input (isolation crosstalk).		–95		dB
Channel-to-channel crosstalk		From previously sampled to channel with 100 kHz, Full-scale input to channel being sampled with DC input (memory crosstalk).		–85		dB
EXTERNAL REFERENCE INPUT
V_REF reference voltage at REFP⁽⁶⁾			2	2.5	3	V
Reference input resistance		At fsample = 1 MHz		100		kΩ
ALARM SETTING
High threshold range			0		4092	LSB
Low threshold range			0		4092	LSB
DIGITAL INPUT/OUTPUT
Logic family		CMOS
Logic level	V_IH		0.7*(+VBD)			V
	V_IL	+VBD = 5 V			0.8
	V_IL	+VBD = 3 V			0.4
	V_OH	At I_source = 200 μA	+VBD-0.2
	V_OL	At I_sink = 200 μA	0.4
Data format MSB first			MSB First
POWER SUPPLY REQUIREMENTS
+VA supply voltage			2.7	3.3	5.25	V
+VBD supply voltage			1.7	3.3	5.25	V
Supply current (normal mode)		At +VA = 2.7 to 3.6 V and 1 MHz throughput		1.8		mA
		At +VA = 2.7 to 3.6 V static state		1.05
		At +VA = 4.7 to 5.25 V and 1 MHz throughput		2.3	3
		At +VA = 4.7 to 5.25 V static state		1.1	1.5
Power-down state supply current				1		μA
+VBD supply current		+VA = 5.25 V, f_s = 1MHz		1		mA
Power-up time					1	μs
Invalid conversions after power up or reset					1	Conversion

(1) Ideal input span; does not include gain or offset error.

(2) ADS795X, where X indicates 0, 1, 2, or 3.

(3) LSB means least significant bit.

(4) Measured relative to an ideal full-scale input.

(5) Calculated on the first nine harmonics of the input frequency.

(6) Device is designed to operate over V_REF = 2 V to 3 V. However one can expect lower noise performance at V_ref < 2.4 V. This is due to SNR degradation resulting from lowered signal range.