Datasheet

f
20MHZ
CLK
( )
550
f
20MHZ
CLK
( )
575
f
20MHZ
CLK
( )
615
f
20MHZ
CLK
( )
0.7
f
20MHZ
CLK
( )
19.3
( )
20MHz
f
CLK
20.8
( )
20MHz
f
CLK
40.8
ADS1601
SBAS322D –DECEMBER 2004–REVISED OCTOBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
All specifications at T
A
= –40°C to +85°C, AVDD = 5V, DVDD = IOVDD = 3V, f
CLK
= 20MHz, V
REF
= +3V, V
CM
= +2.7V, and
R
BIAS
= 60kΩ, unless otherwise noted.
ADS1601
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Digital Filter Characteristics
Passband 0 kHz
Passband ripple ±0.001 dB
–0.1dB attenuation kHz
Passband transition
–3.0dB attentuation kHz
Stop band MHz
Stop band attenuation 75 dB
Group delay μs
Settling time Complete settling μs
Static Specifications
Resolution 16 Bits
No missing codes 16 Bits
Input-referred noise 0.5 0.75 LSB, rms
Integral nonlinearity –0.5dBFS signal 0.75 LSB
Differential nonlinearity 0.25 LSB
Offset error –0.05 %FSR
Offset error drift 0.5 ppmFSR/°C
Gain error 0.25
(1)
%
Gain error drift Excluding reference drift 10 ppm/°C
Common-mode rejection At DC 75 dB
Power-supply rejection At DC 65 dB
Internal Voltage Reference REFEN = low
V
REF
= (VREFP – VREFN) 2.75 3 3.25 V
VREFP 3.5 3.8 4.1 V
VREFN 0.5 0.8 1.1 V
VMID 2.3 2.4 2.6 V
V
REF
drift 50 ppm/°C
Startup time 15 ms
External Voltage Reference REFEN = high
V
REF
= (VREFP – VREFN) 2.0 3 3.25 V
VREFP 3.5 4 4.25 V
VREFN 0.5 1 1.5 V
VMID 2.3 2.5 2.6 V
(1) There is a constant gain error of 2.5% in addition to the variable gain error of ±0.25%. Therefore, the gain error is 2.5 ± 0.25%.
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