Texas Instruments ADS79 EVM-PDK Series, Руководство пользователя

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ADS7950, ADS7951, ADS7952, ADS7953, ADS7954, ADS7955
ADS7956, ADS7957, ADS7958, ADS7959, ADS7960, ADS7961
SLAS605C – JUNE 2008 – REVISED JULY 2018 www.ti.com
Product Folder Links: ADS7950 ADS7951 ADS7952 ADS7953 ADS7954 ADS7955 ADS7956 ADS7957 ADS7958
ADS7959 ADS7960 ADS7961
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Electrical Characteristics, ADS7958, ADS7959, ADS7960, ADS7961 (continued)
+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
(4) Calculated on the first nine harmonics of the input frequency.
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
(4)
100 kHz –75 dB
Signal-to-noise ratio 100 kHz 49 dB
Signal-to-noise + distortion 100 kHz 49
Spurious free dynamic range 100 kHz –78 dB
Full power 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.
–95
dB
From previously sampled to channel with 100 kHz,
Full-scale input to channel being sampled with DC
input.
–85
EXTERNAL REFERENCE INPUT
V
REF
reference voltage at REFP 2 2.5 3 V
Reference input resistance fsample = 1 MHz 100 k
Ω
ALARM SETTING
High threshold range 000 255 LSB
Low threshold range 000 255 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 μ A +VBD-0.2
V
OL
At I
sink
= 200 μ A 0.4
Data format 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 μ A
+VBD supply current +VA = 5.25V, f
s
= 1MHz 1 mA
Power-up time 1
μ
s
Invalid conversions after power up or
reset 1
Conversion