ADS1255IDB Burr-Brown Corporation, ADS1255IDB Datasheet - Page 3

• Manufacturer Part Number: ADS1255IDB
• Description: Very Low Noise/ 24-Bit Analog-to-Digital Converter
• Manufacturer: Burr-Brown Corporation

ELECTRICAL CHARACTERISTICS
All specifications at −40 C to +85 C, AVDD = +5V, DVDD = +1.8V, f CLKIN = 7.68MHz, PGA = 1, and V REF = +2.5V, unless otherwise noted.
Analog Inputs
Full-scale input voltage (AIN P − AIN N )
Absolute input voltage
Absolute input voltage
(AIN0-7, AINCOM to AGND)
(AIN0-7, AINCOM to AGND)
Programmable gain amplifier
Differential input impedance
Differential input impedance
Sensor detect current sources
Sensor detect current sources
System Performance
Resolution
No missing codes
Data rate (f DATA )
Integral nonlinearity
Integral nonlinearity
Offset error
Offset drift
Offset drift
Gain error
Gain error
Gain drift
Gain drift
Common-mode rejection
Noise
AVDD power-supply rejection
DVDD power-supply rejection
Voltage Reference Inputs
Reference input voltage (V REF )
Negative reference input (VREFN)
Negative reference input (VREFN)
Positive reference input (VREFP)
Positive reference input (VREFP)
Voltage reference impedance
Digital Input/Output
V IH
V IH
V IL
V OH
V OL
Input hysteresis
Input leakage
Master clock rate
Master clock rate
www.ti.com
PARAMETER
Buffer off
Buffer on
Buffer off, PGA = 1, 2, 4, 8, 16
Buffer off, PGA = 32, 64
Buffer on, f DATA
SDCS[1:0] = 01
SDCS[1:0] = 10
SDCS[1:0] = 11
All data rates and PGA settings
f CLKIN = 7.68MHz
Differential input, PGA = 1
Differential input, PGA = 64
After calibration
PGA = 1
PGA = 64
After calibration, PGA = 1, Buffer on
After calibration, PGA = 64, Buffer on
PGA = 1
PGA = 64
f CM (4) = 60Hz, f DATA = 30kSPS (5)
V REF
Buffer off
Buffer on (6)
Buffer off
Buffer on (6)
f CLKIN = 7.68MHz
DIN, SCLK, XTAL1/CLKIN,
SYNC/PDWN, CS, RESET
D0/CLKOUT, D1, D2, D3
I OH = 5mA
I OL = 5mA
0 < V DIGITAL INPUT < DVDD
External crystal between XTAL1 and
XTAL2
External oscillator driving CLKIN
5%
10%
in AVDD
in DVDD
VREFP − VREFN
TEST CONDITIONS
50Hz (1)
VREFN + 0.5
VREFN + 0.5
AGND − 0.1
AGND − 0.1
0.8 DVDD
0.8 DVDD
0.8 DVDD
DGND
AGND
AGND
MIN
2.5
0.5
0.1
24
24
95
60
1
2
On the level of the noise
SBAS288D − JUNE 2003 − REVISED AUGUST 2004
See Noise Performance Tables
2V REF /PGA
150/PGA
0.0003
0.0007
TYP
0.005
18.5
7.68
7.68
110
100
4.7
0.5
0.03
2.5
0.5
80
10
100
70
0.8
0.8
2
4
VREFP − 0.5
VREFP − 0.5
AVDD + 0.1
AVDD − 2.0
AVDD + 0.1
AVDD − 2.0
0.2 DVDD
0.2 DVDD
30,000
DVDD
0.0010
MAX
5.25
2.6
64
10
10
10
ADS1255
ADS1256
%FSR (3)
ppm/ C
ppm/ C
SPS (2)
%FSR
nV/ C
nV/ C
UNIT
MHz
MHz
M
k
k
Bit
Bit
dB
dB
dB
k
%
%
V
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A
A
3