Datasheet

www.ti.com
ADS8507
SLAS381 – DECEMBER 2006
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.
ADS8507I ADS8507IB
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
DNL Differential linearity error -2 3 -1 1.5 LSB
No missing codes 15 16 Bits
Transition noise
(2)
0.8 0.8 LSB
Gain Error ±0.2 ±0.1 %
Full scale error
(3) (4)
-0.5 0.5 -0.25 0.25 %
Full scale error drift ±7 ±5 ppm/ °C
Full scale error
(3) (4)
Ext. 2.5-V Ref -0.5 0.5 -0.25 0.25 %
Full scale error drift Ext. 2.5-V Ref ±0.5 ±0.5 ppm/ °C
Bipolar zero error
(3)
±10 V Range -10 10 -5 5 mV
Bipolar zero error drift ±10 V Range ±0.5 ±0.5 ppm/ °C
Unipolar zero error
(5)
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 from
2.2- µF Capacitor to CAP 1 1 ms
power down
(6)
Power supply sensitivity
+4.75 V < V
S
< +5.25 V ±8 ±8 LSB
(V
DIG
= V
ANA
= V
S
)
AC ACCURACY
SFDR Spurious-free dynamic range f
IN
= 1 kHz, ± 10 V 90 100 96 102 dB
(7)
THD Total harmonic distortion f
IN
= 1 kHz, ± 10 V -100 -90 -100 -96 dB
f
IN
= 1 kHz, ± 10 V 83 88 87 89.9
SINAD Signal-to-(noise+distortion) dB
-60 dB Input 30 32
SNR Signal-to-noise 83 88 87 89.9 dB
Usable bandwidth
(8)
f
IN
= 1 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 µs
Overvoltage recovery
(9)
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 (must
1 1 µA
use external buffer)
Internal reference drift 8 8 ppm/ °C
External reference voltage range for
2.3 2.5 2.7 2.3 2.5 2.7 V
specified linearity
External reference current drain Ext. 2.5-V Ref 100 100 µA
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 µA
(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) As measured with fixed resistors, see Figure 43 . Adjustable to zero with external potentiometer.
(6) This is the time delay after the ADS8507 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.
(7) All specifications in dB are referred to a full-scale input.
(8) Usable bandwidth defined as full-scale input frequency at which Signal-to-(Noise + Distortion) degrades to 60 dB.
(9) Recovers to specified performance after 2 x FS input overvoltage.
3
Submit Documentation Feedback