Datasheet

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SBAS253E − MAY 2003 − REVISED JULY 2006
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3
1.5 ELECTRICAL CHARACTERISTICS
Over recommended operating free-air temperature range at –40_C to +85_C, AV
DD
= 5V, BV
DD
= 3.3V, V
REF
= internal +2.5V, f
CLK
= 16MHz,
f
SAMPLE
= 1 MSPS, unless otherwise noted.
ADS7869I
PARAMETER CONDITION MIN TYP
(1)
MAX UNIT
Resolution 12 Bit
Analog Input
Full-scale Voltage, Differential See Gain Adjustment −REF_ADC +REF_ADC V
Input Capacitance 10 pF
Input Leakage Current ±1 nA
CMRR At DC 64 dB
DC Accuracy
No Missing Codes 11 Bit
INL Integral Linearity Error ±1 ±2.5 LSB
DNL Differential Linearity Error ±0.65 ±2 LSB
V
OS
Bipolar Offset Error Synchronous Channels 2 ±6 LSB
V
OS
Bipolar Offset Error AX and BX Channels 5 ±8 LSB
V
OS
Bipolar Offset Match IU, IV, and IW Channels 2.5 6 LSB
V
OS
Bipolar Offset Match A1, B1, A2, and B2 Channels 0.5 3 LSB
V
OS
Bipolar Offset Match AX and BX Channels 0.5 3 LSB
TCV
OS
Bipolar Offset Error Drift 1 µV/°C
Gain Error Max Input Range, Related to REFIN 0.05 1 %
Gain Error Every Other Input Range 1.5 4 %
Gain Error Drift Max Input Range, Related to REFIN 3 ppm/°C
PSRR Power-Supply Rejection Ratio 4.5V < AV
DD
< 5.5V 70 dB
Sampling Dynamics
t
CONV
Conversion Time per ADC 16MHz ≤ f
CLK
≤ 1MHz 0.75 12 µS
t
AQ
Acquisition Time 250 ns
Throughput Rate 1000 kSPS
Aperture Delay 20 ns
Aperture Delay Matching 1 ns
Aperture Jitter 50 ps
Clock Frequency 1 16 MHz
AC Accuracy
Total Harmonic Distortion THD V
IN
= ±2.5V
PP
at 10kHz −78 dB
Signal-to-Noise Distortion SNR V
IN
= ±2.5V
PP
at 10kHz 71 dB
Signal-to-Noise + Distortion SINAD V
IN
= ±2.5V
PP
at 10kHz 70 dB
Digital Inputs
(2)
Logic Family CMOS
V
IH
High-Level Input Voltage 0.7SV
DD
BV
DD
+ 0.3 V
V
IL
Low-Level Input Voltage −0.3 0.3SV
DD
V
I
IN
Input Current BV
DD
to BGND ±50 nA
C
I
Input Capacitance 5 pF
Digital Outputs
(2)
Logic Family CMOS
V
OH
High-Level Output Voltage BV
DD
= 4.5V, I
OH
= −100µA 4.44 V
V
OL
Low-Level Output Voltage BV
DD
= 4.5V, I
OL
= +100µA 0.5 V
I
OZ
High-Impedance-State Output Current V
I
= BV
DD
to BGND ±50 nA
C
O
Output Capacitance 5 pF
C
L
Load Capacitance 30 pF
(1) All values are at T
A
= +25_C.
(2) Applies for 5.0V nominal supply: 4.5V < BV
DD
< 5.5V.
(3) Applies for 3.0V nominal supply: 2.7V < BV
DD
< 3.6V.