AD7949 Analog Devices, AD7949 Datasheet - Page 4

• Manufacturer Part Number: AD7949
• Description: 14-Bit, 8-Channel, 250 kSPS PulSAR ADC
• Manufacturer: Analog Devices

Specifications of AD7949

• Resolution (bits): 14bit
• # Chan: 8
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Adc Architecture: SAR
• Pkg Type: CSP

AD7949
Parameter
INTERNAL REFERENCE
EXTERNAL REFERENCE
TEMPERATURE SENSOR
DIGITAL INPUTS
DIGITAL OUTPUTS
POWER SUPPLIES
TEMPERATURE RANGE
1
2
3
4
5
6
7
8
9
10
11
12
13
See the
The bandwidth is set in the configuration register.
LSB means least significant bit. With the 5 V input range, one LSB = 305 μV.
See the
With VDD = 5 V, unless otherwise noted.
All specifications expressed in decibels are referred to a full-scale input FSR and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
This is the output from the internal band gap.
The output voltage is internal and present on a dedicated multiplexer input.
Unipolar mode: serial 14-bit straight binary.
Bipolar mode: serial 14-bit twos complement.
Conversion results available immediately after completed conversion.
With all digital inputs forced to VIO or GND as required.
During acquisition phase.
Contact an Analog Devices, Inc., sales representative for the extended temperature range.
Temperature Sensitivity
VDD
VIO
REF Output Voltage
REFIN Output Voltage
REF Output Current
Temperature Drift
Line Regulation
Long-Term Drift
Turn-On Settling Time
Voltage Range
Current Drain
Output Voltage
Logic Levels
Data Format
Pipeline Delay
V
V
Standby Current
Power Dissipation
Energy per Conversion
Specified Performance
OL
OH
V
V
I
I
IL
IH
IL
IH
Analog Inputs
Terminology
9
10
8
section. These specifications include full temperature range variation but not the error contribution from the external reference.
11, 12
section.
13
7
Conditions/Comments
2.5 V, @ 25°C
4.096 V, @ 25°C
2.5 V, @ 25°C
4.096 V, @ 25°C
VDD = 5 V ± 5%
1000 hours
CREF = 10 μF
REF input
REFIN input (buffered)
250 kSPS, REF = 5 V
@ 25°C
I
I
Specified performance
Specified performance
Operating range
VDD and VIO = 5 V, @ 25°C
VDD = 2.5 V, 100 SPS throughput
VDD = 2.5 V, 100 kSPS throughput
VDD = 2.5 V, 200 kSPS throughput
VDD = 5 V, 250 kSPS throughput
VDD = 5 V, 250 kSPS throughput with internal
reference
T
SINK
SOURCE
MIN
= +500 μA
to T
= −500 μA
MAX
Rev. C | Page 4 of 32
Min
2.490
4.086
0.5
0.5
−0.3
0.7 × VIO
−1
−1
VIO − 0.3
2.3
2.3
1.8
−40
Typ
2.500
4.096
1.2
2.3
±300
±10
±15
50
5
50
283
1
50
1.5
1.45
2.9
10.8
13.5
50
Max
2.510
4.106
VDD + 0.3
VDD − 0.5
+0.3 × VIO
VIO + 0.3
+1
+1
0.4
5.5
VDD + 0.3
VDD + 0.3
2.0
4.0
12.5
15.5
+85
Data Sheet
ms
Unit
V
V
V
V
μA
ppm/°C
ppm/V
ppm
V
V
μA
mV
mV/°C
V
V
μA
μA
V
V
V
V
V
nA
μW
mW
mW
mW
mW
nJ
°C