ADS8284
SLAS628–MARCH 2009................................................................................................................................................................................................... www.ti.com
SPECIFICATIONS
TA = –40°C to 85°C, VCC = 5 V, VEE = –5 V, +VA = 5 V, +VBD = 5 V or 3.3 V, Vref = 4 V, fSAMPLE = 1 MSPS (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUT
Full-scale input voltage at multiplexer input(1)
CH(i)P–CH(i)M
CH (i)
–Vref
–0.2
Vref
V
V
Absolute input range at multiplexer input
Vref + 0.2
[CH(i)P + CH(i)M] /2
(Vref)/2
– 0.2
(Vref)/2
18
(Vref)/2
+ 0.2
Input common-mode voltage
V
SYSTEM PERFORMANCE
Resolution
Bits
Bits
ADS8284IB
No missing codes
18
18
ADS8284I
ADS8284IB
–2.5
–4.5
–1
±1.25
±1.5
2.5
4.5
1.5
1.5
0.5
0.5
0.1
0.1
(2)
(3)
Integral linearity
LSB
LSB(3)
mV
ADS8284I
ADS8284IB
Differential linearity
±0.6
At 18-bit level
ADS8284I
–1
±0.6
ADS8284IB
Offset error
ADS8284I
–0.5
–0.5
–0.1
–0.1
±0.05
±0.05
±0.025
±0.025
ADS8284IB
Gain error(4)
ADS8284I
External reference
%FS
dB
At 3FFF0H output code. For +VA or VCC, VEE
variation of 0.5 V individually
DC power supply rejection ratio
80
SAMPLING DYNAMICS
+VBD = 5 V
+VDB = 3 V
+VBD = 5 V
+VDB = 3 V
625
625
350
350
650
650
ns
ns
ns
Conversion time
Acquisition time
320
320
Maximum throughput rate
Aperture delay
1.0
MHz
ns
4
5
Aperture jitter
ps
For ADC only
150
700
150
ns
Settling time to 0.5 LSB
For OPA (OP1, OP2) + mux
For ADC only
Over voltage recovery
DYNAMIC CHARACTERISTICS
ADS8284I
ns
–119
–119
–105
–105
–100
–100
98.4
98.4
98
VIN = 4 Vpp at 2 kHz
VIN = 4 Vpp at 10 kHz
dB
dB
dB
dB
dB
dB
ADS8284IB
ADS8284I
Total harmonic distortion
(THD)(5)
ADS8284IB
ADS8284I
ADS8284IB
ADS8284I
ADS8284IB
VIN = 4 Vpp at 100 kHz,
LoPWR = 0
VIN = 4 Vpp at 2 kHz
VIN = 4 Vpp at 10 kHz
97.5
ADS8284I
Signal-to-noise ratio (SNR)
ADS8284IB
98
ADS8284I
95
VIN = 4 Vpp at 100 kHz,
LoPWR = 0
ADS8284IB
97
(1) Ideal input span, does not include gain or offset error.
(2) This is endpoint INL, not best fit.
(3) LSB means least significant bit.
(4) Calculated on the first nine harmonics of the input frequency.
(5) Measured relative to acutal measured reference.
4
Submit Documentation Feedback
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s) :ADS8284
TI [ TEXAS INSTRUMENTS ]
