AD7641 Analog Devices, AD7641 Datasheet - Page 4

• Manufacturer Part Number: AD7641
• Description: 18-Bit, 2 MSPS SAR ADC
• Manufacturer: Analog Devices

Specifications of AD7641

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 2MSPS
• Interface: Byte,Par,Ser,SPI
• Analog Input Type: Diff-Bip
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

AD7641
Parameter
EXTERNAL REFERENCE
REFERENCE BUFFER
TEMPERATURE PIN
DIGITAL INPUTS
DIGITAL OUTPUTS
POWER SUPPLIES
TEMPERATURE RANGE
1
2
3
4
5
6
7
8
9
10
11
12
13
When using an external reference. With the internal reference, the input range is −0.1 V to V
See Analog Inputs section.
Linearity is tested using endnotes, not best fit.
LSB means least significant bit. With the ±2.048 V input range, 1 LSB is 15.63 μV.
See Voltage Reference Input section. These specifications do not include the error contribution from the external reference.
All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
Parallel or serial 18-bit.
Conversion results are available immediately after completed conversion.
See the Absolute Maximum Ratings section.
Consult sales for extended temperature range.
In warp mode. Tested in parallel reading mode.
With internal reference, PDREF and PDBUF are low; without internal reference, PDREF and PDBUF are high.
With all digital inputs forced to OVDD.
REFBUFIN Input Current
Turn-On Settling Time
REFBUFIN Output Voltage
REFBUFIN Output Resistance
Voltage Range
Current Drain
REFBUFIN Input Voltage Range
Voltage Output
Temperature Sensitivity
Output Resistance
Logic Levels
Data Format
Pipeline Delay
Specified Performance
Operating Current
Power Dissipation
In Power-Down Mode
Specified Performance
V
V
I
I
V
V
AVDD
DVDD
OVDD
AVDD
DVDD
OVDD
With Internal Reference
Without Internal Reference
IL
IH
IL
IH
OL
OH
11
12
7
8
11
10
13
12
10
10
Conditions
C
REFBUFIN @ 25°C
PDREF = PDBUF = high
REF
2 MSPS throughput
PDREF = high, PDBUF = low
REF = 2.048 V typ
REFBUFIN = 1.2 V
@ 25°C
I
I
2 MSPS throughput
With internal reference
2 MSPS throughput
2 MSPS throughput
PD = high
T
SINK
SOURCE
MIN
REF
= 500 μA
= 10 μF
to T
= −500 μA
MAX
Rev. 0 | Page 4 of 28
REF
.
Min
1.8
−0.3
1.7
−1
−1
2.37
2.37
2.30
−40
1.05
OVDD − 0.3
9
Typ
5
1.19
6.33
2.048
180
1.2
1
278
1
4.7
2.5
2.5
23
2.5
0.5
75
68
2
Max
AVDD + 0.1
1.30
+0.6
5.25
+1
+1
0.4
2.63
2.63
3.6
92
85
+85
Unit
ms
V
kΩ
V
μA
V
nA
mV
mV/°C
kΩ
V
V
μA
μA
V
V
V
V
V
mA
mA
mA
mW
mW
μW
°C