Datasheet

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ADS8506
SLAS484B – SEPTEMBER 2007 – REVISED DECEMBER 2007
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= -40 ° C to 85 ° C, f
S
= 40 kHz, V
DIG
= V
ANA
= 5 V, and using internal reference and fixed resistors, (see Figure 43 ) unless
otherwise specified.
ADS8506IB ADS8506I
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
DNL Differential linearity error -0.45 ± 0.15 0.45 -0.9 ± 0.15 0.9 LSB
No missing codes 12 12 Bits
Transition noise
(2)
0.1 0.1 LSB
Gain Error ± 0.1 ± 0.2 %
Full scale error
(3) (4)
-0.25 0.25 -0.5 0.5 %
Full scale error drift ± 5 ± 7 ppm/ ° C
Full scale error
(3) (4)
Ext. 2.5-V Ref -0.25 0.25 -0.5 0.5 %
Full scale error drift Ext. 2.5-V Ref ± 0.5 ± 0.5 ppm/ ° C
Bipolar zero error
(3)
± 10 V Range -10 10 -10 10 mV
Bipolar zero error drift ± 10 V Range ± 0.5 ± 0.5 ppm/ ° C
Unipolar zero error
(3)
0 V to 5 V, 0 V to 4 V Ranges -3 3 -3 3 mV
Unipolar zero error drift 0 V to 5 V, 0 V to 4 V Ranges ± 0.5 ± 0.5 ppm/ ° C
Recovery time to rated accuracy 1
2.2- µ F Capacitor to CAP 1 ms
from power down
(5)
Power supply sensitivity
+4.75 V < V
S
< +5.25 V ± 0.5 ± 0.5 LSB
(V
DIG
= V
ANA
= V
S
)
AC ACCURACY
SFDR Spurious-free dynamic range f
IN
= 10 kHz, ± 10 V 80 98 80 98 dB
(6)
THD Total harmonic distortion f
IN
= 10 kHz, ± 10 V -96 -80 -96 -80 dB
f
IN
= 10 kHz, ± 10 V 72 73.9 70 73.9
SINAD Signal-to-(noise+distortion) dB
-60 dB Input 32 32
SNR Signal-to-noise 72 74 70 74 dB
Usable bandwidth
(7)
f
IN
= 10 kHz, ± 10 V 130 130 kHz
Full-power bandwidth (-3 dB) 600 600 kHz
SAMPLING DYNAMICS
Aperture delay 40 40 ns
Aperture jitter 20 20 ps
Transient response FS Step 5 5 µ s
Overvoltage recovery
(8)
750 750 ns
REFERENCE
Internal reference voltage No load 2.48 2.5 2.52 2.48 2.5 2.52 V
Internal reference source current 1
1 µ A
(must use external buffer)
Internal reference drift 8 8 ppm/ ° C
External reference voltage range
2.3 2.5 2.7 2.3 2.5 2.7 V
for specified linearity
External reference current drain Ext. 2.5-V Ref 100 100 µ A
DIGITAL INPUTS
V
IL
Low-level input voltage -0.3 +0.8 -0.3 +0.8 V
V
IH
High-level input voltage 2.0 V
D
+0.3 V 2.0 V
D
+0.3 V V
I
IL
Low-level input current V
IL
= 0 V ± 10 ± 10 µ A
I
IH
High-level input current V
IH
= 5 V ± 10 ± 10 µ A
DIGITAL OUTPUTS
(2) Typical rms noise at worst case transitions.
(3) As measured with fixed resistors, see Figure 43 . Adjustable to zero with external potentiometer.
(4) Full scale error is the worst case of -Full Scale or +Full Scale untrimmed deviation from ideal first and last code transitions, divided by
the transition voltage (not divided by the full-scale range) and includes the effect of offset error.
(5) This is the time delay after the ADS8506 is brought out of Power-Down mode until all internal settling occurs and the analog input is
acquired to rated accuracy. A Convert command after this delay will yield accurate results.
(6) All specifications in dB are referred to a full-scale input.
(7) Usable bandwidth defined as full-scale input frequency at which Signal-to-(Noise + Distortion) degrades to 60 dB.
(8) Recovers to specified performance after 2 x FS input overvoltage.
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