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ADS8515IDBRG4 Datenblatt(Datasheet) 3 Page - TI store

Teile-Nr. ADS8515IDBRG4
Beschreibung  16-Bit 250-kSPS Sampling CMOS ANALOG-TO-DIGITAL CONVERTER
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ADS8515
www.ti.com
SLAS460D – JUNE 2007 – REVISED SEPTEMBER 2010
ELECTRICAL CHARACTERISTICS
At TA = –40°C to 85°C, fs = 250 kHz, VDIG = VANA = 5 V, and using internal reference (unless otherwise noted).
ADS8515I
ADS8515IB
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
Resolution
16
16
Bits
ANALOG INPUT
Voltage range
±10
±10
V
Impedance
8.885
8.885
k
Capacitance
75
75
pF
THROUGHPUT SPEED
Conversion cycle time
Acquire and convert
4
4
ms
Throughput rate
250
250
kHz
DC ACCURACY
INL
Integral linearity error
–3
3
–2
2
LSB
(1)
DNL
Differential linearity error
–1
2
–1
1
LSB
(1)
No missing codes
16
16
Bits
Transition noise
(2)
0.67
0.67
LSB
Full-scale error
(3) (4)
Int. Ref.
–0.5
0.5
–0.25
0.25
%FSR
Full-scale error drift
Int. Ref.
±7
±7
ppm/°C
Full-scale error
(3) (4)
Ext. 4.096-V Ref.
–0.25
0.25
–0.1
0.1
%FSR
Full-scale error drift
Ext. 4.096-V Ref.
±2
±2
ppm/°C
Bipolar zero error
(3)
–4
4
–2
2
mV
Bipolar zero error drift
±2
±2
ppm/°C
Power supply sensitivity
+4.75 V < VD < +5.25 V
–8
8
–8
8
LSB
(VDIG = VANA = VD)
AC ACCURACY
SFDR
Spurious-free dynamic range
fI = 20 kHz
95
102
97
102
dB
(5)
THD
Total harmonic distortion
fI = 20 kHz
–100
–94
–100
–96
dB
fI = 20 kHz
87
91
89
91
dB
SINAD
Signal-to-(noise+distortion)
–60-dB Input
30
32
dB
SNR
Signal-to-noise ratio
fI = 20 kHz
88
92
90
92
dB
Full-power bandwidth
(6)
500
500
kHz
SAMPLING DYNAMICS
Aperture delay
5
5
ns
Transient response
FS Step
2
2
ms
Overvoltage recovery
(7)
150
150
ns
REFERENCE
Internal reference voltage
4.076
4.096
4.116
4.076
4.096
4.116
V
Internal reference source current (must
1
1
mA
use external buffer)
Internal reference drift
8
8
ppm/°C
External reference voltage range for
3.9
4.096
4.2
3.9
4.096
4.2
V
specified linearity
External reference current drain
Ext. 4.096-V Ref.
100
100
mA
DIGITAL INPUTS
Logic levels
VIL
Low-level input voltage
VDIG = 1.65 V – 5.25 V
–0.3
0.8
–0.3
0.35*VDIG
V
VIH
High-level input voltage
VDIG = 1.65 V – 5.25 V
0.65*VDIG
VDIG+0.3 V
0.65*VDIG
VDIG+0.3 V
V
IIL
Low-level input current
VIL = 0 V
±10
±10
mA
IIH
High-level input current
VIH = 5 V
±10
±10
mA
DIGITAL OUTPUTS
(1)
LSB means least significant bit. For the 16-bit, ±10-V input ADS8515, one LSB is 305 mV.
(2)
Typical rms noise at worst case transitions and temperatures.
(3)
As measured with fixed resistors shown in Figure 22. Adjustable to zero with external potentiometer.
(4)
Full-scale error is the worst case of –full-scale or +full-scale 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)
All specifications in dB are referred to a full-scale ±10-V input.
(6)
Full-power bandwidth is defined as the full-scale input frequency at which signal-to-(noise + distortion) degrades to 60 dB, or 10 bits of
accuracy.
(7)
Recovers to specified performance after 2 x FS input overvoltage.
Copyright © 2007–2010, Texas Instruments Incorporated
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