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PDF MAX11254 Data sheet ( Hoja de datos )
| Número de pieza | MAX11254 | |
| Descripción | Delta-Sigma ADC | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX11254
EVALUATION KIT AVAILABLE
24-Bit, 6-Channel, 64ksps, 6.2nV/√Hz PGA,
Delta-Sigma ADC with SPI Interface
General Description
The MAX11254 is a 6-channel, 24-bit delta-sigma ADC
that achieves exceptional performance while consuming
very low power. Sample rates up to 64ksps allow preci-
sion DC measurements. The MAX11254 communicates
via a SPI serial interface and is available in a small (5mm
x 5mm) TQFN package.
The MAX11254 offers a 6.2nV/√Hz noise programmable
gain amplifier (PGA) with gain settings from 1x to 128x.
The integrated PGA provides isolation of the signal inputs
from the switched capacitor sampling network. The PGA
also enables the MAX11254 to interface directly with
high-impedance sources without compromising available
dynamic range.
The MAX11254 operates from a single 2.7V to 3.6V
analog supply, or split ±1.8V analog supplies, allowing
the analog input to be sampled below ground. The digital
supply range is 1.7V to 2.0V or 2.0V to 3.6V, allowing
communication with 1.8V, 2.5V, 3V, or 3.3V logic.
Applications
●● Analog I/O for Programmable Logic Controllers
●● Weigh Scales
●● Pressure Sensors
●● Battery-Powered Instrumentation
Typical Application Circuit
Benefits and Features
●● High Resolution for Industrial Applications that
Require a Wide Dynamic Range
• 133dB SNR at 50sps
• 124dB SNR at 1000sps
●● Longer Battery Life for Portable Applications
• 2.2mA Operating Mode Current
• 1μA Sleep Current
●● Single or Split Analog Supplies Provide Input Voltage
Range Flexibility
• 2.7V to 3.6V (Single Supply) or ±1.8V (Split Supply)
●● Enables System Integration
• Low Noise, 6.2nV/√Hz PGA with Gains of 1, 2, 4,
8, 16, 32, 64, 128
• 6-Channel, Fully Differential Input
●● Enables On-Demand Device and System Gain and
Offset Calibration
• User-Programmable Offset and Gain Registers
●● Robust Performance in a Small Package
• -40°C to +125°C Operating Temperature Range
• TQFN Package, 5mm x 5mm
2.7V TO 3.6V
REF
10nF 1µF 2.0V TO 3.6V
1nF
C0G
AIN0N
AIN5P
1nF
C0G
AIN0P
REFN REFP
AVDD
MAX11254
DVDD
RSTB
CSB
SCLK
DIN
DOUT
RDYB
AIN5N
GPO0 GPO1 GPOGND CAPP CAPN CAPREG AVSS
220nF
0603
X7R
1nF
C0G
RESISTIVE BRIDGE MEASUREMENT CIRCUIT, SPI CONFIGURATION
DGND
1µF
µC
19-7542; Rev 1; 4/15
1 page  
MAX11254
24-Bit, 6-Channel, 64ksps, 6.2nV/√Hz PGA,
Delta-Sigma ADC with SPI Interface
Electrical Characteristics (continued)
(VAVDD = 3.6V, VAVSS = 0V, VDVDD = 2.0V to 3.6V, VREFP - VREFN = VAVDD, DATA RATE = 1ksps, PGA low-noise mode, single-cycle
conversion mode (SCYCLE = 1). TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)(Note 2)
PARAMETER
SYMBOL
Differential Reference Voltage
Range (REFP – REFN)
VREF
REFP, REFN Sampling Rate
SENSOR FAULT DETECT CURRENTS
Current
Initial Tolerance
Drift
DIGITAL SINC FILTER RESPONSE
Bandwidth (-3dB)
CONDITIONS
Settling Time (Latency)
LOGIC INPUTS
Input Current
Input Low Voltage
IDIGILEAK
VIL
Leakage current
Input High Voltage
Input Hysteresis
GPIO Input Low Voltage
GPIO Input High Voltage
GPIO Input Hysteresis
LOGIC OUTPUTS
Output Low Level
Output High Level (RDYB,
DOUT, GPIO_ )
Floating State Leakage Current
Floating State Output
Capacitance
POWER REQUIREMENTS
Negative Analog Supply
Voltage
VIH
VHYS
VIL_GPIO
VIH_GPIO
VHYS_GPIO
VOL
VOH
IDIGOLEAK
CDIGO
VAVSS
IOL = 1mA
IOH = 1mA
Positive Analog Supply Voltage
Negative I/O Supply Voltage
VAVDD
VDGND
MIN
TYP
MAX
1.5 VAVDD
4.096
1.1
±10
0.3
0.203
x DATA
RATE
5/DATA
RATE
0.7 x
VDVDD
1.2
±1
0.3 x
VDVDD
200
0.3
20
0.9 x
VDVDD
9
0.4
±10
UNITS
V
MHz
µA
%
%/°C
Hz
s
µA
V
V
mV
V
V
mV
V
V
µA
pF
-1.8
VAVSS
+ 2.7
0
0
VAVSS
+ 3.6
V
V
V
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX11254
24-Bit, 6-Channel, 64ksps, 6.2nV/√Hz PGA,
Delta-Sigma ADC with SPI Interface
Typical Operating Characteristics (continued)
(VAVDD = +3.6V, VAVSS = 0V, VDVDD = +2.0V, VREFP - VREFN = VAVDD; TA = TMIN to TMAX, LDO enabled, PGA enabled, unless oth-
erwise noted. Data rate = 1ksps, single-cycle conversion mode (SCYCLE = 1) Typical values are at TA = +25°C.)
2.5
2
1.5
1
0.5
0
2.7
SLEEP CURRENT
vs. AVDD VOLTAGE
toc19
TA = +125°C
TA = -40°C
TA = +25°C
3 3.3
VAVDD (V)
3.6
STANDBY CURRENT
vs. AVDD VOLTAGE
toc20
2.8
TA = +125°C
2.3
1.8
TA = -40°C
1.3
0.8
0.3
2.7
TA = +25°C
3 3.3
VAVDD (V)
3.6
ACTIVE CURRENT
vs. DVDD VOLTAGE
750 LDO ENABLED
toc21
730 TA = +125°C
710
690
670
650
630 TA = +25°C
610
TA = -40°C
590
2
2.4 2.8 3.2
VDVDD (V)
3.6
1.4
1.2
1
0.8
0.6
0.4
0.2
2
SLEEP CURRENT
vs. DVDD VOLTAGE
toc22
LDO DISABLED
TA = -40°C
TA = +125°C
TA = +25°C
2.4 2.8
VDVDD (V)
3.2
3.6
STANDBY CURRENT
90
vs. DVDD VOLTAGE
toc23
TA = +125°C
LDO ENABLED
80
70
60
TA = -40°C
50
TA = +25°C
40
2
2.4 2.8 3.2
VDVDD (V)
3.6
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
0
OUTPUT SPECTRUM
SHORTED INPUTS
toc24
BYPASS MODE
SINGLE CYCLE CONTINOUS
fsample = 1ksps
100 200 300
FREQUENCY (Hz)
400
500
0
-20
-40
-60
-80
-100
-120
-140
0
THD
vs. FREQUENCY
toc25
BYPASS MODE
CONTINUOUS
fsample = 8ksps
200 400 600
FREQUENCY (Hz)
800
1000
120
120
119
119
118
118
117
117
116
116
115
-40
SNR
vs. TEMPERATURE
toc26
BYPASS MODE
SINGLE CYCLE CONTINUOUS
fsample = 1ksps
10 60
TEMPERATURE (ºC)
110
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX11254.PDF ] | |
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