Datasheet

ADS1209
www.ti.com SBAS491 –FEBRUARY 2010
RECOMMENDED OPERATING CONDITIONS
PARAMETER MIN NOM MAX UNIT
Supply voltage, AVDD to AGND 4.5 5 5.5 V
Low-voltage levels 2.7 3.0 3.6 V
Supply voltage, BVDD to BGND
5V logic levels 4.5 5 5.5 V
Reference input voltage, V
REF
0.5 2.5 2.6 V
Operating common-mode signal 0 AVDD V
–0.92 × +0.92 ×
Analog inputs +IN – (–IN) V
V
REF
V
REF
External clock
(1)
16 20 24 MHz
Operating ambient temperature range, T
OA
–40 +125 °C
Specified ambient temperature range, T
A
–40 +105 °C
(1) With reduced accuracy, clock can go from 1MHz up to 33MHz; see Typical Characteristic curves.
ELECTRICAL CHARACTERISTICS
Over operating ambient temperature range of –40°C to +105°C, AVDD = 5V, BVDD = 3V, CHx+ = 0.2V to 4.8V, CHx– =
2.5V, V
REFIN
= V
REFOUT
= 2.5V (internal), CLKIN = 20MHz, and 16-bit Sinc
3
filter with OSR = 256, unless otherwise noted.
ADS1209
PARAMETER TEST CONDITIONS MIN TYP
(1)
MAX UNIT
RESOLUTION 16 Bits
DC ACCURACY
V
IN
= ±2.3V
PP
–8 ±3.8 +8 LSB
INL Integral linearity error
(2)
V
IN
= ±2.0V
PP
–4 ±1.8 +4 LSB
Integral linearity match 1 4 LSB
DNL Differential nonlinearity –1 +1 LSB
V
OS
Input offset error –3 ±1.5 +3 mV
Input offset error match 0.2 2 mV
TCV
OS
Input offset error thermal drift –8 1 +8 mV/°C
G
ERR
Gain error Referenced to V
REFIN
–0.5 ±0.02 +0.5 % FSR
Gain error match 0.1 0.5 % FSR
TCG
ERR
Gain error thermal drift ±1.3 ppm/°C
PSRR Power-supply rejection ratio 4.5V < AVDD < 5.5V 82 dB
ANALOG INPUTS
Full-scale differential input voltage
FSR (CHx+) – (CHx–); CHx– = 2.5V –V
REFIN
+V
REFIN
V
range
Specified differential input voltage –0.92 × +0.92 ×
(CHx+) – (CHx–); CHx– = 2.5V V
range V
REF
V
REF
Absolute operating input voltage
0 AV
DD
V
range
C
I
Input capacitance CHx to AGND 3 pF
I
IL
Input leakage current Clock turned off –1 1 µA
R
ID
Differential input resistance 100 kΩ
C
ID
Differential input capacitance 2.5 pF
At dc 108 dB
CMRR Common-mode rejection ratio
V
IN
= ±1.25V
PP
at 40kHz 117 dB
BW Bandwidth Full-scale sine wave, –3dB 50 MHz
(1) All typical values are at T
A
= +25°C.
(2) Integral nonlinearity is defined as the maximum deviation of the line through the end points of the specified input range, expressed either
as the number of LSBs or as a percent of specified input range (4.6V).
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