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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(1) Ideal input span; does not include gain or offset error.
(2) LSB means least significant bit.
(3) Measured relative to an ideal full-scale input.
(4) Calculated on the first nine harmonics of the input frequency.
7.7 Electrical Characteristics, ADS7954, ADS7955, ADS7956, ADS7957
+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
Range 2 while 2xV
REF
≤ +VA 0 2*V
REF
Absolute input range
Range 1 –0.20 V
REF
+0.20
V
Range 2 while 2xV
REF
≤ +VA –0.20 2*V
REF
+0.20
Input capacitance 15 pF
Input leakage current T
A
= 125°C 61 nA
SYSTEM PERFORMANCE
Resolution 10 Bits
No missing codes 10 Bits
Integral linearity –0.5 ±0.2 0.5 LSB
(2)
Differential linearity –0.5 ±0.2 0.5 LSB
Offset error
(3)
–1.5 ±0.5 1.5 LSB
Gain error
Range 1 –1 ±0.1 1
LSB
Range 2 ±0.1
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 –80 dB
Signal-to-noise ratio 100 kHz 60 dB
Signal-to-noise + distortion 100 kHz 60
Spurious free dynamic range 100 kHz 82 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 4092 LSB
Low threshold range 000 4092 LSB