SPECIFICATIONS
ELECTRICAL
TA = –25°C to +85°C, fS = 100kHz, VDIG = VANA = VD = +5V, using external reference, unless otherwise specified.
ADS7821P, U
ADS7821PB, UB
TYP
PARAMETER
RESOLUTION
CONDITIONS
MIN
TYP
MAX
MIN
MAX
UNITS
16
✱
Bits
ANALOG INPUT
Voltage Range
Impedance
0 to +5
10
35
✱
✱
✱
V
kΩ
pF
Capacitance
THROUGHPUT SPEED
Conversion Cycle
Acquire and Convert
10
✱
µs
Throughput Rate
100
15
✱
kHz
DC ACCURACY
Integral Linearity Error
No Missing Codes
Transition Noise(2)
Full Scale Error(3,4)
Full Scale Error Drift
Full Scale Error(3,4)
Full Scale Error Drift
Offset Error
±4
±3
LSB(1)
Bits
LSB
%
ppm/°C
%
ppm/°C
mV
ppm/°C
LSB
16
0.9
±2
±7
±2
✱
✱
±0.5
±0.5
±8
±0.25
±0.25
±4
Internal Reference
Internal Reference
±5
✱
Offset Error Drift
Power Supply Sensitivity
(VDIG = VANA = VD)
+4.75V < VD < +5.25V
±12
±8
AC ACCURACY
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise+Distortion)
fIN = 20kHz
fIN = 20kHz
90
83
83
94
86
86
dB(5)
dB
dB
dB
dB
–90
–94
f
IN = 20kHz
f
IN = –60dB Input
28
30
Signal-to-Noise
Full-Power Bandwidth(6)
f
IN = 20kHz
FS Step
250
✱
kHz
SAMPLING DYNAMICS
Aperture Delay
Transient Response
Overvoltage Recovery(7)
40
✱
✱
ns
µs
ns
2
✱
✱
150
REFERENCE
Internal Reference Voltage
Internal Reference Source Current
(Must use external buffer)
Internal Reference Drift
External Reference Voltage Range
for Specified Linearity
2.48
2.3
2.5
1
2.52
✱
✱
✱
✱
V
µA
8
2.5
✱
✱
ppm/°C
V
2.7
✱
✱
External Reference Current Drain
Ext. 2.5000V Ref
100
µA
DIGITAL INPUTS
Logic Levels
VIL
VIH
IIL
–0.3
+2.0
+0.8
VD +0.3V
±10
✱
✱
✱
✱
✱
✱
V
V
µA
µA
IIH
±10
DIGITAL OUTPUTS
Data Format
Data Coding
VOL
Parallel 16 bits
Straight Binary
+0.4
ISINK = 1.6mA
ISOURCE = 500µA
High-Z State,
✱
✱
✱
V
V
µA
VOH
+4
✱
Leakage Current
±5
V
OUT = 0V to VDIG
High-Z State
Output Capacitance
15
pF
DIGITAL TIMING
Bus Access Time
Bus Relinquish Time
83
83
✱
✱
ns
ns
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
ADS7821
2
BB [ BURR-BROWN CORPORATION ]
